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Bodin S, Peuker LC, Jestin E, Alves ID, Velasco V, Ait-Arsa I, Schollhammer R, Lamare F, Vimont D, MacGrogan G, Hindié E, Beck-Sickinger AG, Morgat C. Development of Radiopharmaceuticals for NPY Receptor-5 (Y5) Nuclear Imaging in Tumors by Synthesis of Specific Agonists and Investigation of Their Binding Mode. Bioconjug Chem 2023; 34:2014-2021. [PMID: 37556437 DOI: 10.1021/acs.bioconjchem.3c00313] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/11/2023]
Abstract
The neuropeptide-Y (NPY) family acts through four G protein-coupled receptor subtypes in humans, namely, Y1, Y2, Y4, and Y5. A growing body of evidence suggest the involvement of the NPY system in several cancers, notably the Y5 subtype, thus acting as a relevant target for the development of radiopharmaceuticals for imaging or targeted radionuclide therapy (TRT). Here, the [cPP(1-7),NPY(19-23),Ala31,Aib32,Gln34]hPP scaffold, further referred to as sY5ago, was modified with a DOTA chelator and radiolabeled with 68Ga and 111In and investigated in vitro and in vivo using the MCF-7 model. For in vivo studies, MCF-7 cells were orthotopically implanted in female nude mice and imaging with small animal positron emission tomography/computed tomography (μPET/CT) was performed. At the end of imaging, the mice were sacrificed. A scrambled version of sY5ago, which was also modified with a DOTA chelator, served as a negative control (DOTA-[Nle]sY5ago_scrambled). sY5ago and DOTA-sY5ago showed subnanomolar affinity toward the Y5 (0.9 ± 0.1 and 0.8 ± 0.1 nM, respectively) and a single binding site at the Y5 was identified. [68Ga]Ga-DOTA-sY5ago and [111In]In-DOTA-sY5ago were hydrophilic and showed high specific internalization (1.61 ± 0.75%/106 cells at 1 h) and moderate efflux (55% of total binding externalized at 45 min). On μPET/CT images, most of the signal was depicted in the kidneys and the liver. MCF-7 tumors were clearly visualized. On biodistribution studies, [68Ga]Ga-DOTA-sY5ago was eliminated by the kidneys (∼60 %ID/g). The kidney uptake is Y5-mediated. A specific uptake was also noted in the liver (5.09 ± 1.15 %ID/g vs 1.13 ± 0.21 %ID/g for [68Ga]Ga-DOTA-[Nle]sY5ago_scrambled, p < 0.05), the lungs (1.03 ± 0.34 %ID/g vs 0.20 %ID/g, p < 0.05), and the spleen (0.85 ± 0.09%ID/g vs 0.16 ± 0.16%ID/g, p < 0.05). In MCF-7 tumors, [68Ga]Ga-DOTA-sY5ago showed 12-fold higher uptake than [68Ga]Ga-DOTA-[Nle]sY5ago_scrambled (3.43 ± 2.32 vs 0.27 ± 0.15 %ID/g, respectively, p = 0.0008) at 1 h post-injection. Finally, a proof-of-principle tissular micro-imaging study on a human primary cancer sample showed weak binding of [111In]In-DOTA-sY5ago in prostatic intra-neoplasia and high binding in the ISUP1 lesion while normal prostate was free of signal.
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Affiliation(s)
- Sacha Bodin
- Department of Nuclear Medicine, University Hospital of Bordeaux, F-33076 Bordeaux, France
- CNRS, EPHE, INCIA UMR 5287, University of Bordeaux, F-33400 Talence, France
| | - Lisa C Peuker
- Institute of Biochemistry, Faculty of Life Sciences, Leipzig University, Brüderstr. 34, 04103 Leipzig, Germany
| | - Emmanuelle Jestin
- GIP CYROI - Cyclotron Réunion Océan Indien, F-97490 Saint Clotilde, France
| | - Isabel D Alves
- CNRS UMR 248, Institute of Chemistry & Biology of Membranes & Nano-objects (CBMN), University of Bordeaux, F-33600 Pessac, France
| | - Valérie Velasco
- Surgical Pathology Unit, Department of Biopathology, Institut Bergonié, F-33076 Bordeaux, France
- ACTION U1218, INSERM, F-33076 Bordeaux, France
| | - Imade Ait-Arsa
- GIP CYROI - Cyclotron Réunion Océan Indien, F-97490 Saint Clotilde, France
| | - Romain Schollhammer
- Department of Nuclear Medicine, University Hospital of Bordeaux, F-33076 Bordeaux, France
- CNRS, EPHE, INCIA UMR 5287, University of Bordeaux, F-33400 Talence, France
| | - Frédéric Lamare
- CNRS, EPHE, INCIA UMR 5287, University of Bordeaux, F-33400 Talence, France
| | - Delphine Vimont
- CNRS, EPHE, INCIA UMR 5287, University of Bordeaux, F-33400 Talence, France
| | - Gaétan MacGrogan
- Surgical Pathology Unit, Department of Biopathology, Institut Bergonié, F-33076 Bordeaux, France
- ACTION U1218, INSERM, F-33076 Bordeaux, France
| | - Elif Hindié
- Department of Nuclear Medicine, University Hospital of Bordeaux, F-33076 Bordeaux, France
- CNRS, EPHE, INCIA UMR 5287, University of Bordeaux, F-33400 Talence, France
- Institut Universitaire de France, F-75000 Paris, France
| | - Annette G Beck-Sickinger
- Institute of Biochemistry, Faculty of Life Sciences, Leipzig University, Brüderstr. 34, 04103 Leipzig, Germany
| | - Clément Morgat
- Department of Nuclear Medicine, University Hospital of Bordeaux, F-33076 Bordeaux, France
- CNRS, EPHE, INCIA UMR 5287, University of Bordeaux, F-33400 Talence, France
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2
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Bodin S, Previti S, Jestin E, Vimont D, Ait-Arsa I, Lamare F, Rémond E, Hindié E, Cavelier F, Morgat C. Design, Synthesis, and Biological Evaluation of the First Radio-Metalated Neurotensin Analogue Targeting Neurotensin Receptor 2. ACS Omega 2023; 8:6994-7004. [PMID: 36844603 PMCID: PMC9948202 DOI: 10.1021/acsomega.2c07814] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2022] [Accepted: 01/30/2023] [Indexed: 05/28/2023]
Abstract
Neurotensin receptor 2 (NTS2) is a well-known mediator of central opioid-independent analgesia. Seminal studies have highlighted NTS2 overexpression in a variety of tumors including prostate cancer, pancreas adenocarcinoma, and breast cancer. Herein, we describe the first radiometalated neurotensin analogue targeting NTS2. JMV 7488 (DOTA-(βAla)2-Lys-Lys-Pro-(D)Trp-Ile-TMSAla-OH) was prepared using solid-phase peptide synthesis, then purified, radiolabeled with 68Ga and 111In, and investigated in vitro on HT-29 cells and MCF-7 cells, respectively, and in vivo on HT-29 xenografts. [68Ga]Ga-JMV 7488 and [111In]In-JMV 7488 were quite hydrophilic (logD7.4 = -3.1 ± 0.2 and -2.7 ± 0.2, respectively, p < 0.0001). Saturation binding studies showed good affinity toward NTS2 (K D = 38 ± 17 nM for [68Ga]Ga-JMV 7488 on HT-29 and 36 ± 10 nM on MCF-7 cells; K D = 36 ± 4 nM for [111In]In-JMV 7488 on HT-29 and 46 ± 1 nM on MCF-7 cells) and good selectivity (no NTS1 binding up to 500 nM). On cell-based evaluation, [68Ga]Ga-JMV 7488 and [111In]In-JMV 7488 showed high and fast NTS2-mediated internalization of 24 ± 5 and 25 ± 11% at 1 h for [111In]In-JMV 7488, respectively, along with low NTS2-membrane binding (<8%). Efflux was as high as 66 ± 9% at 45 min for [68Ga]Ga-JMV 7488 on HT-29 and increased for [111In]In-JMV 7488 up to 73 ± 16% on HT-29 and 78 ± 9% on MCF-7 cells at 2 h. Maximum intracellular calcium mobilization of JMV 7488 was 91 ± 11% to that of levocabastine, a known NTS2 agonist on HT-29 cells demonstrating the agonist behavior of JMV 7488. In nude mice bearing HT-29 xenograft, [68Ga]Ga-JMV 7488 showed a moderate but promising significant tumor uptake in biodistribution studies that competes well with other nonmetalated radiotracers targeting NTS2. Significant uptake was also depicted in lungs. Interestingly, mice prostate also demonstrated [68Ga]Ga-JMV 7488 uptake although the mechanism was not NTS2-mediated.
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Affiliation(s)
- Sacha Bodin
- Department
of Nuclear Medicine, University Hospital
of Bordeaux, 33076 Bordeaux, France
- University
of Bordeaux, CNRS, EPHE, INCIA, UMR 5287, Bordeaux F-33000, France
| | - Santo Previti
- Institut
des Biomolécules Max Mousseron, IBMM, UMR 5247, CNRS, Université
de Montpellier, ENSCM, 1919 route de Mende, 34293 Montpellier cedex 5, France
| | - Emmanuelle Jestin
- Cyclotron
Réunion Océan Indien CYROI, 2 rue Maxime Rivière, 97490 Sainte Clotilde, France
| | - Delphine Vimont
- University
of Bordeaux, CNRS, EPHE, INCIA, UMR 5287, Bordeaux F-33000, France
| | - Imade Ait-Arsa
- Cyclotron
Réunion Océan Indien CYROI, 2 rue Maxime Rivière, 97490 Sainte Clotilde, France
| | - Frédéric Lamare
- Department
of Nuclear Medicine, University Hospital
of Bordeaux, 33076 Bordeaux, France
- University
of Bordeaux, CNRS, EPHE, INCIA, UMR 5287, Bordeaux F-33000, France
| | - Emmanuelle Rémond
- Institut
des Biomolécules Max Mousseron, IBMM, UMR 5247, CNRS, Université
de Montpellier, ENSCM, 1919 route de Mende, 34293 Montpellier cedex 5, France
| | - Elif Hindié
- Department
of Nuclear Medicine, University Hospital
of Bordeaux, 33076 Bordeaux, France
- University
of Bordeaux, CNRS, EPHE, INCIA, UMR 5287, Bordeaux F-33000, France
- Institut
Universitaire de France, 1 rue Descartes, 75231 Paris, France
| | - Florine Cavelier
- Institut
des Biomolécules Max Mousseron, IBMM, UMR 5247, CNRS, Université
de Montpellier, ENSCM, 1919 route de Mende, 34293 Montpellier cedex 5, France
| | - Clément Morgat
- Department
of Nuclear Medicine, University Hospital
of Bordeaux, 33076 Bordeaux, France
- University
of Bordeaux, CNRS, EPHE, INCIA, UMR 5287, Bordeaux F-33000, France
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Mazere J, Dilharreguy B, Catheline G, Vidailhet M, Deffains M, Vimont D, Ribot B, Barse E, Cif L, Mazoyer B, Langbour N, Pisani A, Allard M, Lamare F, Guehl D, Fernandez P, Burbaud P. Striatal and cerebellar vesicular acetylcholine transporter expression is disrupted in human DYT1 dystonia. Brain 2021; 144:909-923. [PMID: 33638639 DOI: 10.1093/brain/awaa465] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2020] [Revised: 10/03/2020] [Accepted: 10/23/2020] [Indexed: 12/20/2022] Open
Abstract
Early-onset torsion dystonia (TOR1A/DYT1) is a devastating hereditary motor disorder whose pathophysiology remains unclear. Studies in transgenic mice suggested abnormal cholinergic transmission in the putamen, but this has not yet been demonstrated in humans. The role of the cerebellum in the pathophysiology of the disease has also been highlighted but the involvement of the intrinsic cerebellar cholinergic system is unknown. In this study, cholinergic neurons were imaged using PET with 18F-fluoroethoxybenzovesamicol, a radioligand of the vesicular acetylcholine transporter (VAChT). Here, we found an age-related decrease in VAChT expression in the posterior putamen and caudate nucleus of DYT1 patients versus matched controls, with low expression in young but not in older patients. In the cerebellar vermis, VAChT expression was also significantly decreased in patients versus controls, but independently of age. Functional connectivity within the motor network studied in MRI and the interregional correlation of VAChT expression studied in PET were also altered in patients. These results show that the cholinergic system is disrupted in the brain of DYT1 patients and is modulated over time through plasticity or compensatory mechanisms.
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Affiliation(s)
- Joachim Mazere
- Department of Nuclear Medicine, CHU de Bordeaux, France.,Institute of Cognitive and Integrative Neurosciences, CNRS UMR 5287, Bordeaux University, F33000, Bordeaux, France
| | - Bixente Dilharreguy
- Institute of Cognitive and Integrative Neurosciences, CNRS UMR 5287, Bordeaux University, F33000, Bordeaux, France
| | - Gwenaëlle Catheline
- Institute of Cognitive and Integrative Neurosciences, CNRS UMR 5287, Bordeaux University, F33000, Bordeaux, France
| | - Marie Vidailhet
- Institut du Cerveau et de la Moelle épinière (ICM) UMR 1127, hôpital de la Pitié-Salpétrière, Department of Neurology, AP-HP, Sorbonne Université, 75013, Paris, France
| | - Marc Deffains
- Institut des Maladies Neurodégénératives (IMN, CNRS U5393), Université de Bordeaux, 33076, Bordeaux, France
| | - Delphine Vimont
- Department of Nuclear Medicine, CHU de Bordeaux, France.,Institute of Cognitive and Integrative Neurosciences, CNRS UMR 5287, Bordeaux University, F33000, Bordeaux, France
| | - Bastien Ribot
- Institut des Maladies Neurodégénératives (IMN, CNRS U5393), Université de Bordeaux, 33076, Bordeaux, France
| | - Elodie Barse
- Institute of Cognitive and Integrative Neurosciences, CNRS UMR 5287, Bordeaux University, F33000, Bordeaux, France
| | - Laura Cif
- Department of Neurosurgery, CHU de Montpellier, 34000, France
| | - Bernard Mazoyer
- Institut des Maladies Neurodégénératives (IMN, CNRS U5393), Université de Bordeaux, 33076, Bordeaux, France
| | - Nicolas Langbour
- Centre de Recherche en Psychiatrie, CH de la Milétrie, 86000, Poitiers, France
| | - Antonio Pisani
- Department of Brain and Behavioural Sciences, University of Pavia, Italy.,IRCCS Mondino Foundation, Pavia, Italy
| | - Michèle Allard
- Department of Nuclear Medicine, CHU de Bordeaux, France.,Institute of Cognitive and Integrative Neurosciences, CNRS UMR 5287, Bordeaux University, F33000, Bordeaux, France
| | - Frédéric Lamare
- Department of Nuclear Medicine, CHU de Bordeaux, France.,Institute of Cognitive and Integrative Neurosciences, CNRS UMR 5287, Bordeaux University, F33000, Bordeaux, France
| | - Dominique Guehl
- Institut des Maladies Neurodégénératives (IMN, CNRS U5393), Université de Bordeaux, 33076, Bordeaux, France.,Service de Neurophysiologie Clinique, Pôle des Neurosciences Cliniques, CHU de Bordeaux, Bordeaux, France
| | - Philippe Fernandez
- Department of Nuclear Medicine, CHU de Bordeaux, France.,Institute of Cognitive and Integrative Neurosciences, CNRS UMR 5287, Bordeaux University, F33000, Bordeaux, France
| | - Pierre Burbaud
- Institut des Maladies Neurodégénératives (IMN, CNRS U5393), Université de Bordeaux, 33076, Bordeaux, France.,Service de Neurophysiologie Clinique, Pôle des Neurosciences Cliniques, CHU de Bordeaux, Bordeaux, France
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4
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Mazere J, Dilharreguy B, Catheline G, Vidailhet M, Deffains M, Vimont D, Ribot B, Barse E, Cif L, Mazoyer B, Langbour N, Pisani A, Allard M, Lamare F, Guehl D, Fernandez P, Burbaud P. Erratum to: Striatal and cerebellar vesicular acetylcholine transporter expression is disrupted in human DYT1 dystonia. Brain 2021; 144:e68. [PMID: 34323950 DOI: 10.1093/brain/awab172] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2021] [Indexed: 11/14/2022] Open
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5
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Abdo RA, Lamare F, Fernandez P, Bentourkia M. Quantification of Hypoxia in Human Glioblastoma using PET with 18F-FMISO. Nucl Med Mol Imaging 2021; 55:107-115. [PMID: 34109007 DOI: 10.1007/s13139-021-00693-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2020] [Revised: 02/16/2021] [Accepted: 03/12/2021] [Indexed: 11/24/2022] Open
Abstract
Purpose This study aimed to investigate the results of compartmental modeling (CM) and spectral analysis (SA) generated with dynamic 18F-FMISO tumor images. Besides, the regular tissue-to-blood ratio (TBR) images were derived and compared with the dynamic models. Methods Nine subjects with glioblastoma underwent PET/CT imaging with the 18F-FMISO tracer. The protocol for PET imaging began with 15 min in dynamic mode and two 10-min duration static images at 120 min and 180 min post-injection. We used the two-tissue compartmental model for CM at the voxel basis, and we conducted SA to estimate the 18F-FMISO accumulation within each voxel. We also investigated the usual tumor-to-blood ratio (TBR) for comparison. Results The images of the tumor showed different patterns of hypoxia and necrosis as a function of PET scanning times, while CM and SA methods based on dynamic PET imaging equally located tumor hypoxia. The mean correlation of Ki images of all subjects between CM and SA was 0.63 ± 0.19 (0.24-0.86). CM produced less noisy K i images than SA, and, in the contrary, SA produced accumulation component images more clear than with CM. CM-K i and SA-K i images were correlated with TBR images (r = 0.72 ± 0.20 and 0.56 ± 0.26, respectively). In the only subject having a continuously increasing tumor time-activity curve, the k 3 image showed a high uptake in the necrosis region which was not apparent in TBR or K i images. Conclusion Based on these results, the combination of CM and SA approaches was found more appropriate in generating voxel-based hypoxia images.
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Affiliation(s)
- Redha-Alla Abdo
- Department of Nuclear Medicine and Radiobiology, University of Sherbrooke, 3001, 12th Avenue North, Sherbrooke, QC J1H 5N4 Canada
| | - Frédéric Lamare
- Service de Médecine Nucléaire, Université de Bordeaux-II, EPHE, Avenue du Haut-Lévêque, 33604 Pessac cedex, Bordeaux, France
| | - Philippe Fernandez
- Service de Médecine Nucléaire, Université de Bordeaux-II, EPHE, Avenue du Haut-Lévêque, 33604 Pessac cedex, Bordeaux, France
| | - M'hamed Bentourkia
- Department of Nuclear Medicine and Radiobiology, University of Sherbrooke, 3001, 12th Avenue North, Sherbrooke, QC J1H 5N4 Canada
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Meyer M, Lamare F, Asselineau J, Foubert‐Samier A, Mazère J, Zanotti‐Fregonara P, Rizzo G, Delamarre A, Spampinato U, Rascol O, Pavy‐Le Traon A, Tison F, Fernandez P, Sibon I, Meissner WG. Brain
5‐HT1A
Receptor Binding in Multiple System Atrophy: An [
18
F
]‐
MPPF PET
Study. Mov Disord 2020; 36:246-251. [DOI: 10.1002/mds.28295] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2020] [Revised: 08/05/2020] [Accepted: 08/26/2020] [Indexed: 11/09/2022] Open
Affiliation(s)
- Marie Meyer
- Service de Médecine Nucléaire, CHU de Bordeaux Bordeaux France
- Institut des Neurosciences Cognitives et Intégratives d'Aquitaine, CNRS, UMR 5287, Bordeaux University Bordeaux France
| | - Frédéric Lamare
- Service de Médecine Nucléaire, CHU de Bordeaux Bordeaux France
- Institut des Neurosciences Cognitives et Intégratives d'Aquitaine, CNRS, UMR 5287, Bordeaux University Bordeaux France
| | - Julien Asselineau
- Public Health Department, Clinical Epidemiology Unit Bordeaux University Hospital Bordeaux France
| | - Alexandra Foubert‐Samier
- Service de Neurologie, CHU Bordeaux Bordeaux France
- French Reference Centre for MSA University Hospital Bordeaux Bordeaux France
- Inserm, UMR1219, Bordeaux Population Health Research Center, Bordeaux University, ISPED Bordeaux France
- Univ. de Bordeaux, CNRS, IMN, UMR 5293, Bordeaux, F‐33000, France Bordeaux France
| | - Joachim Mazère
- Service de Médecine Nucléaire, CHU de Bordeaux Bordeaux France
- Institut des Neurosciences Cognitives et Intégratives d'Aquitaine, CNRS, UMR 5287, Bordeaux University Bordeaux France
| | - Paolo Zanotti‐Fregonara
- Service de Médecine Nucléaire, CHU de Bordeaux Bordeaux France
- Institut des Neurosciences Cognitives et Intégratives d'Aquitaine, CNRS, UMR 5287, Bordeaux University Bordeaux France
| | - Gaia Rizzo
- Invicro and Division of Brain Sciences Imperial College London London UK
| | - Anna Delamarre
- French Reference Centre for MSA University Hospital Bordeaux Bordeaux France
- Univ. de Bordeaux, CNRS, IMN, UMR 5293, Bordeaux, F‐33000, France Bordeaux France
| | | | - Olivier Rascol
- French Reference Centre for MSA University Hospital Toulouse Toulouse France
- Clinical Investigation Center CIC 1436 and Departments of Neurosciences and Clinical Pharmacology Inserm, Toulouse University and CHU Toulouse Toulouse France
| | - Anne Pavy‐Le Traon
- French Reference Centre for MSA University Hospital Toulouse Toulouse France
- Institut des Maladies Métaboliques et Cardiovasculaires, Inserm U 1048, Toulouse University Toulouse France
| | - François Tison
- Service de Neurologie, CHU Bordeaux Bordeaux France
- French Reference Centre for MSA University Hospital Bordeaux Bordeaux France
- Univ. de Bordeaux, CNRS, IMN, UMR 5293, Bordeaux, F‐33000, France Bordeaux France
| | - Philippe Fernandez
- Service de Médecine Nucléaire, CHU de Bordeaux Bordeaux France
- Institut des Neurosciences Cognitives et Intégratives d'Aquitaine, CNRS, UMR 5287, Bordeaux University Bordeaux France
| | - Igor Sibon
- Service de Neurologie, CHU Bordeaux Bordeaux France
| | - Wassilios G Meissner
- Service de Neurologie, CHU Bordeaux Bordeaux France
- French Reference Centre for MSA University Hospital Bordeaux Bordeaux France
- Univ. de Bordeaux, CNRS, IMN, UMR 5293, Bordeaux, F‐33000, France Bordeaux France
- Department of Medicine University of Otago, Christchurch, and New Zealand Brain Research Institute Christchurch New Zealand
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7
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Fanelli R, Chastel A, Previti S, Hindié E, Vimont D, Zanotti-Fregonara P, Fernandez P, Garrigue P, Lamare F, Schollhammer R, Balasse L, Guillet B, Rémond E, Morgat C, Cavelier F. Silicon-Containing Neurotensin Analogues as Radiopharmaceuticals for NTS1-Positive Tumors Imaging. Bioconjug Chem 2020; 31:2339-2349. [DOI: 10.1021/acs.bioconjchem.0c00419] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Roberto Fanelli
- Institut des Biomolécules Max Mousseron, IBMM, UMR-5247, CNRS, Université de Montpellier, ENSCM, Place Eugène Bataillon, Montpellier 34095 Cedex 5, France
| | - Adrien Chastel
- University of Bordeaux, CNRS, EPHE, INCIA, UMR 5287, Bordeaux F-33000, France
- Nuclear Medicine Department, University Hospital of Bordeaux, Bordeaux F-33000, France
| | - Santo Previti
- Institut des Biomolécules Max Mousseron, IBMM, UMR-5247, CNRS, Université de Montpellier, ENSCM, Place Eugène Bataillon, Montpellier 34095 Cedex 5, France
| | - Elif Hindié
- University of Bordeaux, CNRS, EPHE, INCIA, UMR 5287, Bordeaux F-33000, France
- Nuclear Medicine Department, University Hospital of Bordeaux, Bordeaux F-33000, France
| | - Delphine Vimont
- University of Bordeaux, CNRS, EPHE, INCIA, UMR 5287, Bordeaux F-33000, France
| | | | - Philippe Fernandez
- University of Bordeaux, CNRS, EPHE, INCIA, UMR 5287, Bordeaux F-33000, France
- Nuclear Medicine Department, University Hospital of Bordeaux, Bordeaux F-33000, France
| | - Philippe Garrigue
- Aix-Marseille University, INSERM, Institut National de la Recherche Agronomique, Centre de Recherche en Cardiovasculaire et Nutrition, Marseille 13385, France
- Aix-Marseille University, Centre Européen de Recherche en Imagerie Médicale, Marseille 13005, France
| | - Frédéric Lamare
- University of Bordeaux, CNRS, EPHE, INCIA, UMR 5287, Bordeaux F-33000, France
- Nuclear Medicine Department, University Hospital of Bordeaux, Bordeaux F-33000, France
| | - Romain Schollhammer
- University of Bordeaux, CNRS, EPHE, INCIA, UMR 5287, Bordeaux F-33000, France
- Nuclear Medicine Department, University Hospital of Bordeaux, Bordeaux F-33000, France
| | - Laure Balasse
- Aix-Marseille University, INSERM, Institut National de la Recherche Agronomique, Centre de Recherche en Cardiovasculaire et Nutrition, Marseille 13385, France
| | - Benjamin Guillet
- Aix-Marseille University, INSERM, Institut National de la Recherche Agronomique, Centre de Recherche en Cardiovasculaire et Nutrition, Marseille 13385, France
- Aix-Marseille University, Centre Européen de Recherche en Imagerie Médicale, Marseille 13005, France
| | - Emmanuelle Rémond
- Institut des Biomolécules Max Mousseron, IBMM, UMR-5247, CNRS, Université de Montpellier, ENSCM, Place Eugène Bataillon, Montpellier 34095 Cedex 5, France
| | - Clément Morgat
- University of Bordeaux, CNRS, EPHE, INCIA, UMR 5287, Bordeaux F-33000, France
- Nuclear Medicine Department, University Hospital of Bordeaux, Bordeaux F-33000, France
| | - Florine Cavelier
- Institut des Biomolécules Max Mousseron, IBMM, UMR-5247, CNRS, Université de Montpellier, ENSCM, Place Eugène Bataillon, Montpellier 34095 Cedex 5, France
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8
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Merlin T, Stute S, Benoit D, Bert J, Carlier T, Comtat C, Filipovic M, Lamare F, Visvikis D. CASToR: a generic data organization and processing code framework for multi-modal and multi-dimensional tomographic reconstruction. ACTA ACUST UNITED AC 2018; 63:185005. [DOI: 10.1088/1361-6560/aadac1] [Citation(s) in RCA: 54] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Merlin T, Visvikis D, Fernandez P, Lamare F. Dynamic PET image reconstruction integrating temporal regularization associated with respiratory motion correction for applications in oncology. ACTA ACUST UNITED AC 2018; 63:045012. [DOI: 10.1088/1361-6560/aaa86a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Abdo RA, Lamare F, Fernandez P, Bentourkia M. Imaging of hypoxia in human glioblastoma with dynamic 18F-fluoromisonidazole PET. CDR 2018; 2:131-140. [PMID: 35582145 PMCID: PMC9019176 DOI: 10.20517/cdr.2018.21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/31/2018] [Revised: 12/11/2018] [Accepted: 02/19/2019] [Indexed: 11/12/2022]
Abstract
Aim: The purpose of this study was to locate the levels of hypoxia in glioblastoma PET images measured with 18F-fluoromisonidazole in human subjects. It is recognized that tumors with hypoxia are resistant to treatment by radiotherapy and chemotherapy. Methods: The images were acquired in dynamic mode for 15 min or 30 min and in static mode for two single scans at 2 h and 3 h to allow the accumulation of the radiotracer in the tumor. The images were analyzed at the voxel basis with compartmental analysis (CA) and with the usual tumor-to-blood uptake ratio (TBR). Kmeans algorithm was applied to cluster the levels of hypoxia in the images. Results: TBR at a threshold of 1.2 at imaging times of 15 min, 2 h and 3 h produced images with different clusters. Also, the comparison of TBR with the distribution volume obtained with CA had a similarity index of 0.61 ± 0.05. Conclusion: We found some differences in defining the hypoxic volume within a tumor using TBR. The compartmental analysis allowed discrimination of the tumor hypoxic sub-volumes which can be useful for a better treatment with radiotherapy.
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Affiliation(s)
- Redha-Alla Abdo
- Department of Nuclear Medicine and Radiobiology, Université de Sherbrooke, Sherbrooke, QC J1H5N4, Canada
| | - Frédéric Lamare
- Service de Médecine Nucléaire, Université de Bordeaux-II, EPHE, Bordeaux 33076, France
| | - Philippe Fernandez
- Service de Médecine Nucléaire, Université de Bordeaux-II, EPHE, Bordeaux 33076, France
| | - M’hamed Bentourkia
- Department of Nuclear Medicine and Radiobiology, Université de Sherbrooke, Sherbrooke, QC J1H5N4, Canada
- Correspondence Address: Dr. M’hamed Bentourkia, Department of Nuclear Medicine and Radiobiology, Université de Sherbrooke, 3001, 12th Avenue North, Sherbrooke, QC J1H5N4, Canada. E-mail:
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Papin J, Cazalis B, Frizonnet JM, Desquines J, Lemoine F, Georgenthum V, Lamare F, Petit M. Summary and Interpretation of the CABRI REP-Na Program. NUCL TECHNOL 2017. [DOI: 10.13182/nt07-a3815] [Citation(s) in RCA: 53] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- J. Papin
- Institut de Radioprotection et Sûreté Nucléaire Direction de la Prévention des Accidents Majeurs 13115 Saint-Paul lez Durance BP3, Cedex France
| | - B. Cazalis
- Institut de Radioprotection et Sûreté Nucléaire Direction de la Prévention des Accidents Majeurs 13115 Saint-Paul lez Durance BP3, Cedex France
| | - J. M. Frizonnet
- Institut de Radioprotection et Sûreté Nucléaire Direction de la Prévention des Accidents Majeurs 13115 Saint-Paul lez Durance BP3, Cedex France
| | - J. Desquines
- Institut de Radioprotection et Sûreté Nucléaire Direction de la Prévention des Accidents Majeurs 13115 Saint-Paul lez Durance BP3, Cedex France
| | - F. Lemoine
- Institut de Radioprotection et Sûreté Nucléaire Direction de la Prévention des Accidents Majeurs 13115 Saint-Paul lez Durance BP3, Cedex France
| | - V. Georgenthum
- Institut de Radioprotection et Sûreté Nucléaire Direction de la Prévention des Accidents Majeurs 13115 Saint-Paul lez Durance BP3, Cedex France
| | - F. Lamare
- Institut de Radioprotection et Sûreté Nucléaire Direction de la Prévention des Accidents Majeurs 13115 Saint-Paul lez Durance BP3, Cedex France
| | - M. Petit
- Institut de Radioprotection et Sûreté Nucléaire Direction de la Prévention des Accidents Majeurs 13115 Saint-Paul lez Durance BP3, Cedex France
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Mazère J, Lamare F, Allard M, Fernandez P, Mayo W. 123I-Iodobenzovesamicol SPECT Imaging of Cholinergic Systems in Dementia with Lewy Bodies. J Nucl Med 2016; 58:123-128. [PMID: 27469360 DOI: 10.2967/jnumed.116.176180] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2016] [Accepted: 06/29/2016] [Indexed: 01/28/2023] Open
Abstract
Cholinergic alterations in dementia with Lewy bodies (DLB) have been widely documented in postmortem studies, whereas in vivo studies are sparse, particularly at the subcortical level. We used 123I-iodobenzovesamicol, a SPECT radiotracer of the vesicular acetylcholine transporter, to evaluate in vivo in DLB the integrity of the 3 main cholinergic pathways-the Ch1 (septohippocampal), the Ch4 (innominatocortical), and the Ch5 (pontothalamic) cholinergic pathways-as well as the striatal cholinergic interneurons. In addition, we assessed the involvement of the cholinergic system in cognitive and neuropsychiatric disorders in DLB patients. METHODS Twelve healthy volunteers (median age, 72 y; interquartile range, 6.25 y) and 11 DLB patients (median age, 76 y; interquartile range, 10.50 y) underwent a dynamic 123I-iodobenzovesamicol SPECT scan and an MRI scan. MR images were automatically segmented, providing the volumes of several regions of interest, including the striatum and cholinergic terminals in Ch1 (hippocampus), Ch4 (cortical lobes), and Ch5 (thalamus). For each region of interest and each subject, pharmacokinetic modeling allowed calculation of the nondisplaceable binding potential (BPND) values for the binding of 123I-iodobenzovesamicol to the vesicular acetylcholine transporter. A neuropsychological evaluation of participants was performed with the Mini-Mental State Examination and the Grober-Buschke, Set, visual discrimination, Benton, and Wechsler tests, and cognitive fluctuations and apathy were also assessed. RESULTS Compared with BPND values for healthy subjects, BPND values for DLB patients were significantly lower in the Ch4 terminal regions of the anterior cingulate cortex and the superior and inferior parietal cortices (P = 0.0006, 0.0015, and 0.0023, respectively), in the Ch5 terminal region of the thalamus (P = 0.0003), and in the striatum (P = 0.0042). All of the neuropsychological test scores were significantly lower in DLB patients than in healthy subjects. Four DLB patients with apathy and 4 DLB patients without apathy were identified. For the anterior cingulate cortex, compared with BPND values in healthy subjects, BPND values were significantly lower in patients with apathy (P = 0.004) and were unchanged in patients without apathy. CONCLUSION Our results confirm the existence in DLB of cholinergic alterations, reaching both cortical and subcortical levels, including the Ch5 pathway and the striatum. Alterations in cholinergic transmission in the anterior cingulate cortex could be closely associated with the development of apathy.
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Affiliation(s)
- Joachim Mazère
- Université de Bordeaux, INCIA, UMR 5287, Bordeaux, France .,CNRS, INCIA, UMR 5287, Bordeaux, France.,Service de Médecine Nucléaire, CHU de Bordeaux, Bordeaux, France; and
| | - Frédéric Lamare
- Université de Bordeaux, INCIA, UMR 5287, Bordeaux, France.,CNRS, INCIA, UMR 5287, Bordeaux, France.,Service de Médecine Nucléaire, CHU de Bordeaux, Bordeaux, France; and
| | - Michele Allard
- Université de Bordeaux, INCIA, UMR 5287, Bordeaux, France.,CNRS, INCIA, UMR 5287, Bordeaux, France.,Service de Médecine Nucléaire, CHU de Bordeaux, Bordeaux, France; and.,EPHE, Paris, France
| | - Philippe Fernandez
- Université de Bordeaux, INCIA, UMR 5287, Bordeaux, France.,CNRS, INCIA, UMR 5287, Bordeaux, France.,Service de Médecine Nucléaire, CHU de Bordeaux, Bordeaux, France; and
| | - Willy Mayo
- Université de Bordeaux, INCIA, UMR 5287, Bordeaux, France.,CNRS, INCIA, UMR 5287, Bordeaux, France
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Abstract
PURPOSE Despite multiple methodologies already proposed to correct respiratory motion in the whole PET imaging field of view (FOV), such approaches have not found wide acceptance in clinical routine. An alternative can be the local respiratory motion correction (LRMC) of data corresponding to a given volume of interest (VOI: organ or tumor). Advantages of LRMC include the use of a simple motion model, faster execution times, and organ specific motion correction. The purpose of this study was to evaluate the performance of LMRC using various motion models for oncology (lung lesion) applications. METHODS Both simulated (NURBS based 4D cardiac-torso phantom) and clinical studies (six patients) were used in the evaluation of the proposed LRMC approach. PET data were acquired in list-mode and synchronized with respiration. The implemented approach consists first in defining a VOI on the reconstructed motion average image. Gated PET images of the VOI are subsequently reconstructed using only lines of response passing through the selected VOI and are used in combination with a center of gravity or an affine/elastic registration algorithm to derive the transformation maps corresponding to the respiration effects. Those are finally integrated in the reconstruction process to produce a motion free image over the lesion regions. RESULTS Although the center of gravity or affine algorithm achieved similar performance for individual lesion motion correction, the elastic model, applied either locally or to the whole FOV, led to an overall superior performance. The spatial tumor location was altered by 89% and 81% for the elastic model applied locally or to the whole FOV, respectively (compared to 44% and 39% for the center of gravity and affine models, respectively). This resulted in similar associated overall tumor volume changes of 84% and 80%, respectively (compared to 75% and 71% for the center of gravity and affine models, respectively). The application of the nonrigid deformation model in LRMC led to over an order of magnitude gain in computational efficiency of the correction relative to the application of the deformable model to the whole FOV. CONCLUSIONS The results of this study support the use of LMRC as a flexible and efficient correction approach for respiratory motion effects for single lesions in the thoracic area.
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Affiliation(s)
- F Lamare
- INCIA, UMR 5287, University of Bordeaux, Talence F-33400, France and Nuclear Medicine Department, University Hospital, Bordeaux 33000, France
| | - H Fayad
- INSERM, UMR1101, LaTIM, Université de Bretagne Occidentale, Brest 29609, France
| | - P Fernandez
- INCIA, UMR 5287, University of Bordeaux, Talence F-33400, France and Nuclear Medicine Department, University Hospital, Bordeaux 33000, France
| | - D Visvikis
- INSERM, UMR1101, LaTIM, Université de Bretagne Occidentale, Brest 29609, France
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Mazère J, Mayo W, Pariscoat G, Schulz J, Allard M, Fernandez P, Lamare F. Simplified Quantification Method for In Vivo SPECT Imaging of the Vesicular Acetylcholine Transporter with 123I-Iodobenzovesamicol. J Nucl Med 2015; 56:862-8. [PMID: 25908834 DOI: 10.2967/jnumed.114.147074] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2014] [Accepted: 04/06/2015] [Indexed: 11/16/2022] Open
Abstract
UNLABELLED (123)I-iodobenzovesamicol is a SPECT radioligand selective for the vesicular acetylcholine transporter (VAChT) and used to assess the integrity of cholinergic pathways in various neurologic disorders. The current noninvasive method for quantitative analysis of (123)I-iodobenzovesamicol, based on multilinear reference tissue model 2 (MRTM2), requires repeated scans for several hours, limiting its application in clinical trials. Our objective was to validate a simplified acquisition method based on a single (123)I-iodobenzovesamicol static scan preserving the quantification accuracy. Three acquisition times were tested comparatively to a kinetic analysis using MRTM2. METHODS Six healthy volunteers underwent a dynamic SPECT acquisition comprising 14 frames over 28 h and an MR imaging scan. MR images were automatically segmented, providing the volumes of 19 regions of interest (ROIs). SPECT datasets were coregistered with MR images, and regional time-activity curves were derived. For each ROI, a complete MRTM2 pharmacokinetic analysis, using the cerebellar hemispheres as the reference region, led to the calculation of a (123)I-iodobenzovesamicol-to-VAChT binding parameter, the nondisplaceable binding potential (BP(ND-MRTM2)). A simplified analysis was also performed at 5, 8, and 28 h after injection, providing a simplified BP(ND), given as BP(ND-t) = C(ROI) - C(cerebellar hemispheres)/C(cerebellar hemispheres), with C being the averaged radioactive concentration. RESULTS No significant difference was found among BP(ND-5 h), BP(ND-8 h), and BP(ND-MRTM2) in any of the extrastriatal regions explored. BP(ND-28 h) was significantly higher than BP(ND-5 h), BP(ND-8 h), and BP(ND-MRTM2) in 9 of the 17 regions explored (P < 0.05). BP(ND-5 h), BP(ND-8 h), and BP(ND-28 h) correlated significantly with BP(ND-MRTM2) (P < 0.05; ρ = 0.99, 0.98, and 0.92, respectively). In the striatum, BP(ND-28 h) was significantly higher than BP(ND-5 h) and BP(ND-8 h). BP(ND-5 h) differed significantly from BP(ND-MRTM2) (P < 0.05), with BP(ND-5 h) being 43.6% lower. CONCLUSION In the extrastriatal regions, a single acquisition at 5 or 8 h after injection provides quantitative results similar to a pharmacokinetic analysis. However, with the highest correlation and accuracy, 5 h is the most suitable time to perform an accurate (123)I-iodobenzovesamicol quantification. In the striatum, none of the 3 times has led to an accurate quantification.
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Affiliation(s)
- Joachim Mazère
- University of Bordeaux, INCIA, UMR 5287, Bordeaux, France CNRS, INCIA, UMR 5287, Bordeaux, France Service de Médecine Nucléaire, CHU de Bordeaux, Bordeaux, France; and
| | - Willy Mayo
- University of Bordeaux, INCIA, UMR 5287, Bordeaux, France CNRS, INCIA, UMR 5287, Bordeaux, France
| | - Guillaume Pariscoat
- University of Bordeaux, INCIA, UMR 5287, Bordeaux, France CNRS, INCIA, UMR 5287, Bordeaux, France
| | - Jürgen Schulz
- University of Bordeaux, INCIA, UMR 5287, Bordeaux, France CNRS, INCIA, UMR 5287, Bordeaux, France
| | - Michele Allard
- University of Bordeaux, INCIA, UMR 5287, Bordeaux, France CNRS, INCIA, UMR 5287, Bordeaux, France Service de Médecine Nucléaire, CHU de Bordeaux, Bordeaux, France; and EPHE, Paris, France
| | - Philippe Fernandez
- University of Bordeaux, INCIA, UMR 5287, Bordeaux, France CNRS, INCIA, UMR 5287, Bordeaux, France Service de Médecine Nucléaire, CHU de Bordeaux, Bordeaux, France; and
| | - Frédéric Lamare
- University of Bordeaux, INCIA, UMR 5287, Bordeaux, France CNRS, INCIA, UMR 5287, Bordeaux, France Service de Médecine Nucléaire, CHU de Bordeaux, Bordeaux, France; and
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de Figueiredo BH, Antoine M, Trouette R, Lagarde P, Petit A, Lamare F, Hatt M, Fernandez P. Use of FDG-PET to guide dose prescription heterogeneity in stereotactic body radiation therapy for lung cancers with volumetric modulated arc therapy: a feasibility study. Radiat Oncol 2014; 9:300. [PMID: 25534014 PMCID: PMC4300182 DOI: 10.1186/s13014-014-0300-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2014] [Accepted: 12/14/2014] [Indexed: 11/23/2022] Open
Abstract
Background The aim of this study was to assess if FDG-PET could guide dose prescription heterogeneity and decrease arbitrary location of hotspots in SBRT. Methods For three patients with stage I lung cancer, a CT-simulation and a FDG-PET were registered to define respectively the PTVCT and the biological target volume (BTV). Two plans involving volumetric modulated arc therapy (VMAT) and simultaneous integrated boost (SIB) were calculated. The first plan delivered 4 × 12 Gy within the PTVCT and the second plan, with SIB, 4 × 12 Gy and 13.8 Gy (115% of the prescribed dose) within the PTVCT and the BTV respectively. The Dmax-PTVCT had to be inferior to 60 Gy (125% of the prescribed dose). Plans were evaluated through the D95%, D99% and Dmax-PTVCT, the D2 cm, the R50% and R100% and the dice similarity coefficient (DSC) between the isodose 115% and BTV. DSC allows verifying the location of the 115% isodose (ideal value = 1). Results The mean PTVCT and BTV were 36.7 (±12.5) and 6.5 (±2.2) cm3 respectively. Both plans led to similar target coverage, same doses to the OARs and equivalent fall-off of the dose outside the PTVCT. On the other hand, the location of hotspots, evaluated through the DSC, was improved for the SIB plans with a mean DSC of 0.31 and 0.45 for the first and the second plans respectively. Conclusions Use of PET to decrease arbitrary location of hotspots is feasible with VMAT and SIB for lung cancer.
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Henriques de Figueiredo B, Zacharatou C, Galland-Girodet S, Benech J, De Clermont-Gallerande H, Lamare F, Hatt M, Digue L, De Mones del Pujol E, Fernandez P. Hypoxia imaging with [18F]-FMISO-PET for guided dose escalation with intensity-modulated radiotherapy in head-and-neck cancers. Strahlenther Onkol 2014; 191:217-24. [PMID: 25245468 DOI: 10.1007/s00066-014-0752-8] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2014] [Accepted: 09/02/2014] [Indexed: 11/30/2022]
Abstract
BACKGROUND AND PURPOSE Positron emission tomography (PET) with [(18)F]-fluoromisonidazole ([(18)F]-FMISO) provides a non-invasive assessment of hypoxia. The aim of this study is to assess the feasibility of a dose escalation with volumetric modulated arc therapy (VMAT) guided by [(18)F]-FMISO-PET for head-and-neck cancers (HNC). PATIENTS AND METHODS Ten patients with inoperable stages III-IV HNC underwent [(18)F]-FMISO-PET before radiotherapy. Hypoxic target volumes (HTV) were segmented automatically by using the fuzzy locally adaptive Bayesian method. Retrospectively, two VMAT plans were generated delivering 70 Gy to the gross tumour volume (GTV) defined on computed tomography simulation or 79.8 Gy to the HTV. A dosimetric comparison was performed, based on calculations of tumour control probability (TCP), normal tissue complication probability (NTCP) for the parotid glands and uncomplicated tumour control probability (UTCP). RESULTS The mean hypoxic fraction, defined as the ratio between the HTV and the GTV, was 0.18. The mean average dose for both parotids was 22.7 Gy and 25.5 Gy without and with dose escalation respectively. FMISO-guided dose escalation led to a mean increase of TCP, NTCP for both parotids and UTCP by 18.1, 4.6 and 8% respectively. CONCLUSION A dose escalation up to 79.8 Gy guided by [(18)F]-FMISO-PET with VMAT seems feasible with improvement of TCP and without excessive increase of NTCP for parotids.
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Affiliation(s)
- B Henriques de Figueiredo
- Department of Radiotherapy, Institut Bergonié, 229, cours de l'Argonne, 33076, BORDEAUX Cedex, France,
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Fayad H, Le Pogam A, Lamare F, Fernandez P, Pradier O, Valette G, Visvikis D, Cheze Le Rest C. Influence of partial volume correction in staging of head and neck squamous cell carcinoma using PET/CT. Q J Nucl Med Mol Imaging 2014; 58:319-328. [PMID: 25265252] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
AIM PET/CT is widely used for the detection of lymph node involvement in head and neck squamous cell carcinoma (HNSCC). However, PET qualitative and quantitative capabilities are hindered by partial volume effects (PVE). Therefore, a retrospective study on 32 patients (57 lymph nodes) was carried out to evaluate the potential improvement of PVE correction (PVEC) in FDG PET/CT imaging for the diagnosis of HNSCC. Histopathological analysis of lymph nodes following neck dissection was used as the gold standard. METHODS A previously proposed deconvolution based PVEC approach was used to derive improved quantitative accuracy PET images, while the anatomical lymph node volumes were determined on the CT images. Different parameters including SUVmax and SUVmean were derived from both original and PVEC PET images for each patient. RESULTS Histopathology confirmed that SUVmax and SUVmean after PVEC allows a statistically significant differentiation of malignant and benign lymph nodes (P<0.05). The sensitivity of SUVmax and SUVmean was 64% and 57% respectively with or without PVEC. PVEC increased specificity from 71% to 76% for SUVmax and 57% to 66% for SUVmean. Corresponding accuracy increased from 66% to 71% for SUVmax and from 59% to 66% for SUVmean. However, the most accurate differentiation between benign and malignant nodes was obtained while using the magnitude of SUVmax increase after PVEC with a corresponding sensitivity, specificity and accuracy of 77%, 82% and 80% respectively. CONCLUSION Our work shows that the use of partial volume effects correction allows a more accurate nodal staging using FDG PET imaging in HNSCC.
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Affiliation(s)
- H Fayad
- INSERM, UMR1101, LaTIM, CHRU Morvan, Brest, France -
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Laffon E, de Clermont H, Lamare F, Marthan R. Estimating the amount of FDG uptake in physiological tissues. Nucl Med Biol 2014; 41:717-20. [PMID: 25073424 DOI: 10.1016/j.nucmedbio.2014.06.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2014] [Revised: 05/22/2014] [Accepted: 06/05/2014] [Indexed: 01/09/2023]
Abstract
INTRODUCTION It is known that for a fixed amount of injected tracer, the amount available for a tissue of interest will be less if other tissues show intense uptake. The aim of this study was to estimate the magnitude of 2-deoxy-2-[(18)F]fluoro-D-glucose (18FDG) uptake amount in physiological tissues that may show an intense uptake in current clinical practice. METHODS A formula was established providing an estimate of the percentage of injected 18FDG molecules (P; in %) that are irreversibly trapped in an 18FDG-positive tissue during a PET examination. RESULTS P ≅ 0.17*exp(-λt(acq))*TLG/W, where λ is the (18)F physical decay constant, t(acq) is the injection-acquisition time delay, TLG is total lesion glycolysis (g) and W is the patient weight (kg). The magnitude of P was calculated in two patients showing an intense uptake in brown fat, myocardium and bowels: 0.5, 3.5, and 4.2% respectively. CONCLUSIONS A formula is available to quickly estimate the amount of 18FDG uptake in tissues. We suggest that the accumulation of different physiological uptakes may actually affect SUV quantification in a tissue of interest.
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Affiliation(s)
- E Laffon
- CHU de Bordeaux, Service de Médecine Nucléaire, F-33604 Pessac, France; Université de Bordeaux 2, Centre de Recherche Cardio-Thoracique, F-33076 Bordeaux, France; INSERM U 1045, Centre de Recherche Cardio-Thoracique, F-33076 Bordeaux, France.
| | - H de Clermont
- CHU de Bordeaux, Service de Médecine Nucléaire, F-33604 Pessac, France
| | - F Lamare
- CHU de Bordeaux, Service de Médecine Nucléaire, F-33604 Pessac, France
| | - R Marthan
- Université de Bordeaux 2, Centre de Recherche Cardio-Thoracique, F-33076 Bordeaux, France; INSERM U 1045, Centre de Recherche Cardio-Thoracique, F-33076 Bordeaux, France
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Lamare F, Le Maitre A, Dawood M, Schäfers KP, Fernandez P, Rimoldi OE, Visvikis D. Evaluation of respiratory and cardiac motion correction schemes in dual gated PET/CT cardiac imaging. Med Phys 2014; 41:072504. [DOI: 10.1118/1.4881099] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Laffon E, Lamare F, de Clermont H, Burger IA, Marthan R. Variability of average SUV from several hottest voxels is lower than that of SUVmax and SUVpeak. Eur Radiol 2014; 24:1964-70. [DOI: 10.1007/s00330-014-3222-x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2013] [Revised: 04/17/2014] [Accepted: 05/06/2014] [Indexed: 02/01/2023]
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Fayad H, Le Pogam A, Lamare F, Fernandez P, Pradier O, Valette G, Visvikis D, Cheze Le Rest C. Influence of partial volume correction in staging of head and neck squamous cell carcinoma using PET/CT. Q J Nucl Med Mol Imaging 2013:R39Y9999N00A0066. [PMID: 24309537] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Aim: PET/CT is widely used for the detection of lymph node involvement in head and neck squamous cell carcinoma (HNSCC). However, PET qualitative and quantitative capabilities are hindered by partial volume effects (PVE). Therefore, a retrospective study on 32 patients (57 lymph nodes) was carried out to evaluate the potential improvement of PVE correction (PVEC) in FDG PET/CT imaging for the diagnosis of HNSCC. Histopathological analysis of lymph nodes following neck dissection was used as the gold standard. Methods: A previously proposed deconvolution based PVEC approach was used to derive improved quantitative accuracy PET images, while the anatomical lymph node volumes were determined on the CT images. Different parameters including SUVmax and SUVmean were derived from both original and PVEC PET images for each patient. Results: Histopathology confirmed that SUVmax and SUVmean after PVEC allows a statistically significant differentiation of malignant and benign lymph nodes (p<0.05). The sensitivity of SUVmax and SUVmean was 64% and 57% respectively with or without PVEC. PVEC increased specificity from 71% to 76% for SUVmax and 57% to 66% for SUVmean. Corresponding accuracy increased from 66% to 71% for SUVmax and from 59% to 66% for SUVmean. However, the most accurate differentiation between benign and malignant nodes was obtained while using the magnitude of SUVmax increase after PVEC with a corresponding sensitivity, specificity and accuracy of 77%, 82% and 80% respectively. Conclusion: Our work shows that the use of partial volume effects correction allows a more accurate nodal staging using FDG PET imaging in HNSCC.
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Affiliation(s)
- H Fayad
- INSERM, UMR1101, LaTIM, CHRU Morvan, Brest, France -
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De Clermont-Gallerande H, Pasticier G, Lebras Y, Robert G, Mokrane Y, Fouchet S, Cornelis F, Lamare F, Ferriere J, Balanger P, Grenier N, Ravaud A, Fernandez P. Évaluation de la tomographie par émission de positons à la 18Fluorocholine (FCH-TEP) dans le bilan initial du cancer de la prostate (CP) à haut risque et à risque intermédiaire : étude prospective sur 97 patients. Prog Urol 2013. [DOI: 10.1016/j.purol.2013.08.181] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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23
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Henriques de Figueiredo B, Merlin T, de Clermont-Gallerande H, Hatt M, Vimont D, Fernandez P, Lamare F. Potential of [18F]-fluoromisonidazole positron-emission tomography for radiotherapy planning in head and neck squamous cell carcinomas. Strahlenther Onkol 2013; 189:1015-9. [PMID: 24173497 DOI: 10.1007/s00066-013-0454-7] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2013] [Accepted: 08/05/2013] [Indexed: 01/06/2023]
Abstract
BACKGROUND AND PURPOSE Positron-emission tomography (PET) with [(18)F]-fluoromisonidazole (FMISO) permits consideration of radiotherapy dose escalation to hypoxic volumes in head and neck cancers (HNC). However, the definition of FMISO volumes remains problematic. The aims of this study are to confirm that delayed acquisition at 4 h is most appropriate for FMISO-PET imaging and to assess different methods of volume segmentation. PATIENTS AND METHODS A total of 15 HNC patients underwent several FMISO-PET/computed tomography (CT) acquisitions 2, 3 and 4 h after FMISO injection. Three automatic methods of PET image segmentation were tested: fixed threshold, adaptive threshold based on the ratio between tumour-derived and background activities (R(T/B)) and the fuzzy locally adaptive Bayesian (FLAB) method. The hypoxic fraction (HF), which is defined as the ratio between the FMISO and CT volumes, was also calculated. RESULTS The R(T/B) for images acquired at 2, 3 and 4 h differed significantly, with mean values of 2.5 (1.7-2.9), 3 (2-4.5) and 3.4 (2.3-6.1), respectively. The mean tumour volume, as defined manually using CT images, was 39.1 ml (1.2-116 ml). After 4 h, the mean FMISO volumes were 18.9 (0.1-81), 9.5 (0.9-33.1) and 12.5 ml (0.9-38.4 ml) with fixed threshold, adaptive threshold and the FLAB method, respectively; median HF values were 0.47 (0.1-1.93), 0.25 (0.11-0.75) and 0.35 (0.14-1.05), respectively. FMISO volumes were significantly different. CONCLUSION The best contrast is obtained at the 4-hour acquisition time. Large discrepancies were found between the three tested methods of volume segmentation.
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Affiliation(s)
- B Henriques de Figueiredo
- Department of Radiotherapy, Institut Bergonié, 229, cours de l'Argonne, 33076, Bordeaux Cedex, France,
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Mazere J, Meissner WG, Sibon I, Lamare F, Tison F, Allard M, Mayo W. [(123)I]-IBVM SPECT imaging of cholinergic systems in multiple system atrophy: A specific alteration of the ponto-thalamic cholinergic pathways (Ch5-Ch6). Neuroimage Clin 2013; 3:212-7. [PMID: 24179865 PMCID: PMC3791287 DOI: 10.1016/j.nicl.2013.07.012] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/08/2013] [Revised: 07/30/2013] [Accepted: 07/31/2013] [Indexed: 11/18/2022]
Abstract
UNLABELLED We evaluated in vivo the integrity of brain cholinergic pathways in Multiple System Atrophy (MSA) and the relationship between cholinergic dysfunction and motor disturbances, by measuring the vesicular acetylcholine transporter (VAChT) expression using Single Photon Emission Computed Tomography (SPECT) and [(123)I]-iodobenzovesamicol ([(123)I]-IBVM). METHODS Nine patients with probable MSA and 12 healthy volunteers underwent a dynamic [(123)I]-IBVM SPECT-CT scan and a magnetic resonance imaging (MRI) scan. All patients were examined with the Unified MSA Rating Scale (UMSARS; subscale I = activities of daily living (ADL), II = motor and IV = disability). CT and MRI images were used to register the dynamic SPECT image to the Montreal Neurological Institute brain template, which includes the regions of interest (ROI) of striatum and Ch1 (medial septum nucleus-hippocampus), Ch4 (nucleus basalis of Meynert-cortex) and Ch5-Ch6 (pedunculopontine and laterodorsal tegmental nuclei-thalamus) cholinergic pathways. For each ROI, pharmacokinetic modeling of regional time activity curves led to the calculation of [(123)I]-IBVM to VAChT binding potential (BPND) value, proportional to VAChT expression. RESULTS When compared to controls, BPND values for MSA in Ch5-Ch6 were significantly decreased in both the pedunculopontine-laterodorsal nuclei and the thalamus (p = 0.004 and p = 0.006, respectively). Additionally, thalamus BPND values were correlated with UMSARS ADL (p = 0.006), motor (p = 0.002) and disability (p = 0.02) sub-scores. UMSARS motor subscale items 13 (postural instability) and 14 (gait) were also correlated with thalamus BPND values (p = 0.04). CONCLUSION Ch5-Ch6 are the most affected cholinergic pathways in MSA at both cell bodies and thalamic cholinergic terminals. These results underscore the relevant role of [(123)I]-IBVM SPECT for improving our understanding of the pathophysiology in MSA.
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Affiliation(s)
- Joachim Mazere
- Univ. Bordeaux, INCIA, UMR 5287, F-33400 Talence, France
- CNRS, INCIA, UMR 5287, F-33400 Talence, France
- CHU de Bordeaux, Service de Médecine Nucléaire, Bordeaux, France
- Corresponding author at: Service de Médecine Nucléaire, Hôpital du Haut-Lévêque, Avenue de Magellan, F-33604 Pessac Cedex, France. Tel.: + 33 5 57 65 64 08; fax: + 33 5 57 65 68 39.
| | - Wassilios. G. Meissner
- Univ. de Bordeaux, Institut des Maladies Neurodégénératives, UMR 5293, F-33000 Bordeaux, France
- CNRS, Institut des Maladies Neurodégénératives, UMR 5293, F-33000 Bordeaux, France
- CHU de Bordeaux, Service de Neurologie et Centre de Référence Atrophie Multisystématisée, Pessac, France
| | - Igor Sibon
- Univ. Bordeaux, INCIA, UMR 5287, F-33400 Talence, France
- CNRS, INCIA, UMR 5287, F-33400 Talence, France
| | - Frédéric Lamare
- Univ. Bordeaux, INCIA, UMR 5287, F-33400 Talence, France
- CNRS, INCIA, UMR 5287, F-33400 Talence, France
- CHU de Bordeaux, Service de Médecine Nucléaire, Bordeaux, France
| | - François Tison
- Univ. de Bordeaux, Institut des Maladies Neurodégénératives, UMR 5293, F-33000 Bordeaux, France
- CNRS, Institut des Maladies Neurodégénératives, UMR 5293, F-33000 Bordeaux, France
- CHU de Bordeaux, Service de Neurologie et Centre de Référence Atrophie Multisystématisée, Pessac, France
| | - Michèle Allard
- Univ. Bordeaux, INCIA, UMR 5287, F-33400 Talence, France
- CNRS, INCIA, UMR 5287, F-33400 Talence, France
- CHU de Bordeaux, Service de Médecine Nucléaire, Bordeaux, France
- EPHE, France
| | - Willy Mayo
- Univ. Bordeaux, INCIA, UMR 5287, F-33400 Talence, France
- CNRS, INCIA, UMR 5287, F-33400 Talence, France
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Abstract
Respiratory motion is a major source of reduced quality in positron emission tomography (PET). In order to minimize its effects, the use of respiratory synchronized acquisitions, leading to gated frames, has been suggested. Such frames, however, are of low signal-to-noise ratio (SNR) as they contain reduced statistics. Super-resolution (SR) techniques make use of the motion in a sequence of images in order to improve their quality. They aim at enhancing a low-resolution image belonging to a sequence of images representing different views of the same scene. In this work, a maximum a posteriori (MAP) super-resolution algorithm has been implemented and applied to respiratory gated PET images for motion compensation. An edge preserving Huber regularization term was used to ensure convergence. Motion fields were recovered using a B-spline based elastic registration algorithm. The performance of the SR algorithm was evaluated through the use of both simulated and clinical datasets by assessing image SNR, as well as the contrast, position and extent of the different lesions. Results were compared to summing the registered synchronized frames on both simulated and clinical datasets. The super-resolution image had higher SNR (by a factor of over 4 on average) and lesion contrast (by a factor of 2) than the single respiratory synchronized frame using the same reconstruction matrix size. In comparison to the motion corrected or the motion free images a similar SNR was obtained, while improvements of up to 20% in the recovered lesion size and contrast were measured. Finally, the recovered lesion locations on the SR images were systematically closer to the true simulated lesion positions. These observations concerning the SNR, lesion contrast and size were confirmed on two clinical datasets included in the study. In conclusion, the use of SR techniques applied to respiratory motion synchronized images lead to motion compensation combined with improved image SNR and contrast, without any increase in the overall acquisition times.
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Huchet A, Lamare F, Mella C, Benech J, de Clermont H, Maire JP, Loiseau H, Trouette R, Galland-Girodet S, Fernandez P. Intérêt de la tomographie par émission de positrons au [18F]-fluoromisonidazole dans le cadre d’une escalade de dose pour les glioblastomes. Cancer Radiother 2011. [DOI: 10.1016/j.canrad.2011.07.152] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Boussion N, Hatt M, Lamare F, Rest CCL, Visvikis D. Contrast enhancement in emission tomography by way of synergistic PET/CT image combination. Comput Methods Programs Biomed 2008; 90:191-201. [PMID: 18291555 DOI: 10.1016/j.cmpb.2007.12.009] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2007] [Revised: 12/17/2007] [Accepted: 12/20/2007] [Indexed: 05/25/2023]
Abstract
UNLABELLED The display of image fusion is well accepted as a powerful tool in visual image analysis and comparison. In clinical practice, this is a mandatory step when studying images from a dual PET/CT scanner. However, the display methods that are implemented on most workstations simply show both images side by side, in separate and synchronized windows. Sometimes images are presented superimposed in a single window, preventing the user from doing quantitative analysis. In this article a new image fusion scheme is presented, allowing performing quantitative analysis directly on the fused images. METHODS The objective is to preserve the functional information provided by PET while incorporating details of higher resolution from the CT image. The process relies on a discrete wavelet-based image merging: both images are decomposed into successive details layers by using the "à trous" transform. This algorithm performs wavelet decomposition of images and provides coarser and coarser spatial resolution versions of them. The high-spatial frequencies of the CT, or details, can be easily obtained at any level of resolution. A simple model is then inferred to compute the lacking details of the PET scan from the high frequency detail layers of the CT. These details are then incorporated in the PET image on a voxel-to-voxel basis, giving the fused PET/CT image. RESULTS Aside from the expected visual enhancement, quantitative comparison of initial PET and CT images with fused images was performed in 12 patients. The obtained results were in accordance with the objectives of the study, in the sense that the organs' mean intensity in PET was preserved in the fused image. CONCLUSION This alternative approach to PET/CT fusion display should be of interest for people interested in a more quantitative aspect of image fusion. The proposed method is actually complementary to more classical visualization tools.
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Affiliation(s)
- N Boussion
- INSERM, U650, Laboratoire du traitement de l'information médicale , CHU Morvan, 29609 Brest, France.
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Lamare F, Ledesma Carbayo MJ, Cresson T, Kontaxakis G, Santos A, Le Rest CC, Reader AJ, Visvikis D. List-mode-based reconstruction for respiratory motion correction in PET using non-rigid body transformations. Phys Med Biol 2007; 52:5187-204. [PMID: 17762080 DOI: 10.1088/0031-9155/52/17/006] [Citation(s) in RCA: 217] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Respiratory motion in emission tomography leads to reduced image quality. Developed correction methodology has been concentrating on the use of respiratory synchronized acquisitions leading to gated frames. Such frames, however, are of low signal-to-noise ratio as a result of containing reduced statistics. In this work, we describe the implementation of an elastic transformation within a list-mode-based reconstruction for the correction of respiratory motion over the thorax, allowing the use of all data available throughout a respiratory motion average acquisition. The developed algorithm was evaluated using datasets of the NCAT phantom generated at different points throughout the respiratory cycle. List-mode-data-based PET-simulated frames were subsequently produced by combining the NCAT datasets with Monte Carlo simulation. A non-rigid registration algorithm based on B-spline basis functions was employed to derive transformation parameters accounting for the respiratory motion using the NCAT dynamic CT images. The displacement matrices derived were subsequently applied during the image reconstruction of the original emission list mode data. Two different implementations for the incorporation of the elastic transformations within the one-pass list mode EM (OPL-EM) algorithm were developed and evaluated. The corrected images were compared with those produced using an affine transformation of list mode data prior to reconstruction, as well as with uncorrected respiratory motion average images. Results demonstrate that although both correction techniques considered lead to significant improvements in accounting for respiratory motion artefacts in the lung fields, the elastic-transformation-based correction leads to a more uniform improvement across the lungs for different lesion sizes and locations.
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Affiliation(s)
- F Lamare
- INSERM, U650, Laboratoire du Traitement de l'Information Médicale, Brest, F-29200 France
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29
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Hatt M, Lamare F, Boussion N, Roux C, Turzo A, Cheze-Lerest C, Jarritt P, Carson K, Salzenstein F, Collet C, Visvikis D. Fuzzy hidden Markov chains segmentation for volume determination and quantitation in PET. Phys Med Biol 2007; 52:3467-91. [PMID: 17664555 PMCID: PMC3183438 DOI: 10.1088/0031-9155/52/12/010] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Accurate volume of interest (VOI) estimation in PET is crucial in different oncology applications such as response to therapy evaluation and radiotherapy treatment planning. The objective of our study was to evaluate the performance of the proposed algorithm for automatic lesion volume delineation; namely the fuzzy hidden Markov chains (FHMC), with that of current state of the art in clinical practice threshold based techniques. As the classical hidden Markov chain (HMC) algorithm, FHMC takes into account noise, voxel intensity and spatial correlation, in order to classify a voxel as background or functional VOI. However the novelty of the fuzzy model consists of the inclusion of an estimation of imprecision, which should subsequently lead to a better modelling of the 'fuzzy' nature of the object of interest boundaries in emission tomography data. The performance of the algorithms has been assessed on both simulated and acquired datasets of the IEC phantom, covering a large range of spherical lesion sizes (from 10 to 37 mm), contrast ratios (4:1 and 8:1) and image noise levels. Both lesion activity recovery and VOI determination tasks were assessed in reconstructed images using two different voxel sizes (8 mm3 and 64 mm3). In order to account for both the functional volume location and its size, the concept of % classification errors was introduced in the evaluation of volume segmentation using the simulated datasets. Results reveal that FHMC performs substantially better than the threshold based methodology for functional volume determination or activity concentration recovery considering a contrast ratio of 4:1 and lesion sizes of <28 mm. Furthermore differences between classification and volume estimation errors evaluated were smaller for the segmented volumes provided by the FHMC algorithm. Finally, the performance of the automatic algorithms was less susceptible to image noise levels in comparison to the threshold based techniques. The analysis of both simulated and acquired datasets led to similar results and conclusions as far as the performance of segmentation algorithms under evaluation is concerned.
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Affiliation(s)
- Mathieu Hatt
- LATIM, Laboratoire de Traitement de l'Information Medicale
INSERM : U650Université de Bretagne Occidentale - BrestInstitut TélécomTélécom BretagneCHU BrestUniversité européenne de BretagneHopital Morvan, 5 Avenue Foch, 29609 Brest Cedex,FR
- Correspondence should be adressed to: Mathieu Hatt
| | - Frédéric Lamare
- LATIM, Laboratoire de Traitement de l'Information Medicale
INSERM : U650Université de Bretagne Occidentale - BrestInstitut TélécomTélécom BretagneCHU BrestUniversité européenne de BretagneHopital Morvan, 5 Avenue Foch, 29609 Brest Cedex,FR
| | - Nicolas Boussion
- LATIM, Laboratoire de Traitement de l'Information Medicale
INSERM : U650Université de Bretagne Occidentale - BrestInstitut TélécomTélécom BretagneCHU BrestUniversité européenne de BretagneHopital Morvan, 5 Avenue Foch, 29609 Brest Cedex,FR
| | - Christian Roux
- LATIM, Laboratoire de Traitement de l'Information Medicale
INSERM : U650Université de Bretagne Occidentale - BrestInstitut TélécomTélécom BretagneCHU BrestUniversité européenne de BretagneHopital Morvan, 5 Avenue Foch, 29609 Brest Cedex,FR
- GET, GET
Ecole Nationale Supérieure des Télécommunications de BretagneTechnopôle de Brest Iroise - BP 832 - 29285 Brest CEDEX,FR
| | - Alexandre Turzo
- LATIM, Laboratoire de Traitement de l'Information Medicale
INSERM : U650Université de Bretagne Occidentale - BrestInstitut TélécomTélécom BretagneCHU BrestUniversité européenne de BretagneHopital Morvan, 5 Avenue Foch, 29609 Brest Cedex,FR
- Service de médecine nucléaire
CHU BrestHôpital MorvanBrest, F-29609,FR
| | - Catherine Cheze-Lerest
- LATIM, Laboratoire de Traitement de l'Information Medicale
INSERM : U650Université de Bretagne Occidentale - BrestInstitut TélécomTélécom BretagneCHU BrestUniversité européenne de BretagneHopital Morvan, 5 Avenue Foch, 29609 Brest Cedex,FR
- Service de médecine nucléaire
CHU BrestHôpital MorvanBrest, F-29609,FR
| | | | | | - Fabien Salzenstein
- InESS, Institut d'Electronique du Solide et des Systèmes
CNRS : UMR7163Université Louis Pasteur - Strasbourg I23, rue du Loess - BP 20 CR 67037 STRASBOURG Cedex 2,FR
| | - Christophe Collet
- ENSPS, Ecole Nationale Supérieure de Physique de Strasbourg
Ecole Nationale Supérieure de Physique de StrasbourgBoulevard Sébastien Brant - Pôle d'Innovation API, BP 10413 F-67412 ILLKIRCH,FR
| | - Dimitris Visvikis
- LATIM, Laboratoire de Traitement de l'Information Medicale
INSERM : U650Université de Bretagne Occidentale - BrestInstitut TélécomTélécom BretagneCHU BrestUniversité européenne de BretagneHopital Morvan, 5 Avenue Foch, 29609 Brest Cedex,FR
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Lamare F, Cresson T, Savean J, Cheze Le Rest C, Reader AJ, Visvikis D. Respiratory motion correction for PET oncology applications using affine transformation of list mode data. Phys Med Biol 2006; 52:121-40. [PMID: 17183132 DOI: 10.1088/0031-9155/52/1/009] [Citation(s) in RCA: 110] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Respiratory motion is a source of artefacts and reduced image quality in PET. Proposed methodology for correction of respiratory effects involves the use of gated frames, which are however of low signal-to-noise ratio. Therefore a method accounting for respiratory motion effects without affecting the statistical quality of the reconstructed images is necessary. We have implemented an affine transformation of list mode data for the correction of respiratory motion over the thorax. The study was performed using datasets of the NCAT phantom at different points throughout the respiratory cycle. List mode data based PET simulated frames were produced by combining the NCAT datasets with a Monte Carlo simulation. Transformation parameters accounting for respiratory motion were estimated according to an affine registration and were subsequently applied on the original list mode data. The corrected and uncorrected list mode datasets were subsequently reconstructed using the one-pass list mode EM (OPL-EM) algorithm. Comparison of corrected and uncorrected respiratory motion average frames suggests that an affine transformation in the list mode data prior to reconstruction can produce significant improvements in accounting for respiratory motion artefacts in the lungs and heart. However, the application of a common set of transformation parameters across the imaging field of view does not significantly correct the respiratory effects on organs such as the stomach, liver or spleen.
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Affiliation(s)
- F Lamare
- INSERM U650, Laboratoire du Traitement de l'information medicale (LaTIM), Université de Bretagne occidentale, Brest, France
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31
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Boussion N, Hatt M, Lamare F, Bizais Y, Turzo A, Cheze-Le Rest C, Visvikis D. A multiresolution image based approach for correction of partial volume effects in emission tomography. Phys Med Biol 2006; 51:1857-76. [PMID: 16552110 DOI: 10.1088/0031-9155/51/7/016] [Citation(s) in RCA: 89] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Partial volume effects (PVEs) are consequences of the limited spatial resolution in emission tomography. They lead to a loss of signal in tissues of size similar to the point spread function and induce activity spillover between regions. Although PVE can be corrected for by using algorithms that provide the correct radioactivity concentration in a series of regions of interest (ROIs), so far little attention has been given to the possibility of creating improved images as a result of PVE correction. Potential advantages of PVE-corrected images include the ability to accurately delineate functional volumes as well as improving tumour-to-background ratio, resulting in an associated improvement in the analysis of response to therapy studies and diagnostic examinations, respectively. The objective of our study was therefore to develop a methodology for PVE correction not only to enable the accurate recuperation of activity concentrations, but also to generate PVE-corrected images. In the multiresolution analysis that we define here, details of a high-resolution image H (MRI or CT) are extracted, transformed and integrated in a low-resolution image L (PET or SPECT). A discrete wavelet transform of both H and L images is performed by using the "à trous" algorithm, which allows the spatial frequencies (details, edges, textures) to be obtained easily at a level of resolution common to H and L. A model is then inferred to build the lacking details of L from the high-frequency details in H. The process was successfully tested on synthetic and simulated data, proving the ability to obtain accurately corrected images. Quantitative PVE correction was found to be comparable with a method considered as a reference but limited to ROI analyses. Visual improvement and quantitative correction were also obtained in two examples of clinical images, the first using a combined PET/CT scanner with a lymphoma patient and the second using a FDG brain PET and corresponding T1-weighted MRI in an epileptic patient.
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Affiliation(s)
- N Boussion
- INSERM U650, Laboratoire du Traitement de l'Information Médicale (LaTIM), CHU Morvan, Brest, France
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Abstract
A newly developed simulation toolkit, GATE (Geant4 Application for Tomographic Emission), was used to develop a Monte Carlo simulation of a fully three-dimensional (3D) clinical PET scanner. The Philips Allegro/GEMINI PET systems were simulated in order to (a) allow a detailed study of the parameters affecting the system's performance under various imaging conditions, (b) study the optimization and quantitative accuracy of emission acquisition protocols for dynamic and static imaging, and (c) further validate the potential of GATE for the simulation of clinical PET systems. A model of the detection system and its geometry was developed. The accuracy of the developed detection model was tested through the comparison of simulated and measured results obtained with the Allegro/GEMINI systems for a number of NEMA NU2-2001 performance protocols including spatial resolution, sensitivity and scatter fraction. In addition, an approximate model of the system's dead time at the level of detected single events and coincidences was developed in an attempt to simulate the count rate related performance characteristics of the scanner. The developed dead-time model was assessed under different imaging conditions using the count rate loss and noise equivalent count rates performance protocols of standard and modified NEMA NU2-2001 (whole body imaging conditions) and NEMA NU2-1994 (brain imaging conditions) comparing simulated with experimental measurements obtained with the Allegro/GEMINI PET systems. Finally, a reconstructed image quality protocol was used to assess the overall performance of the developed model. An agreement of <3% was obtained in scatter fraction, with a difference between 4% and 10% in the true and random coincidence count rates respectively, throughout a range of activity concentrations and under various imaging conditions, resulting in <8% differences between simulated and measured noise equivalent count rates performance. Finally, the image quality validation study revealed a good agreement in signal-to-noise ratio and contrast recovery coefficients for a number of different volume spheres and two different (clinical level based) tumour-to-background ratios. In conclusion, these results support the accurate modelling of the Philips Allegro/GEMINI PET systems using GATE in combination with a dead-time model for the signal flow description, which leads to an agreement of <10% in coincidence count rates under different imaging conditions and clinically relevant activity concentration levels.
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Affiliation(s)
- F Lamare
- U650 INSERM, Laboratoire du Traitement de l'information medicale (LaTIM), CHU Morvan, Université de Bretagne Occidentale, Brest, 29609, France.
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Jan S, Santin G, Strul D, Staelens S, Assié K, Autret D, Avner S, Barbier R, Bardiès M, Bloomfield PM, Brasse D, Breton V, Bruyndonckx P, Buvat I, Chatziioannou AF, Choi Y, Chung YH, Comtat C, Donnarieix D, Ferrer L, Glick SJ, Groiselle CJ, Guez D, Honore PF, Kerhoas-Cavata S, Kirov AS, Kohli V, Koole M, Krieguer M, van der Laan DJ, Lamare F, Largeron G, Lartizien C, Lazaro D, Maas MC, Maigne L, Mayet F, Melot F, Merheb C, Pennacchio E, Perez J, Pietrzyk U, Rannou FR, Rey M, Schaart DR, Schmidtlein CR, Simon L, Song TY, Vieira JM, Visvikis D, Van de Walle R, Wieërs E, Morel C. GATE: a simulation toolkit for PET and SPECT. Phys Med Biol 2004. [PMID: 15552416 DOI: 10.1088/0031‐9155/49/19/007] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Monte Carlo simulation is an essential tool in emission tomography that can assist in the design of new medical imaging devices, the optimization of acquisition protocols and the development or assessment of image reconstruction algorithms and correction techniques. GATE, the Geant4 Application for Tomographic Emission, encapsulates the Geant4 libraries to achieve a modular, versatile, scripted simulation toolkit adapted to the field of nuclear medicine. In particular, GATE allows the description of time-dependent phenomena such as source or detector movement, and source decay kinetics. This feature makes it possible to simulate time curves under realistic acquisition conditions and to test dynamic reconstruction algorithms. This paper gives a detailed description of the design and development of GATE by the OpenGATE collaboration, whose continuing objective is to improve, document and validate GATE by simulating commercially available imaging systems for PET and SPECT. Large effort is also invested in the ability and the flexibility to model novel detection systems or systems still under design. A public release of GATE licensed under the GNU Lesser General Public License can be downloaded at http:/www-lphe.epfl.ch/GATE/. Two benchmarks developed for PET and SPECT to test the installation of GATE and to serve as a tutorial for the users are presented. Extensive validation of the GATE simulation platform has been started, comparing simulations and measurements on commercially available acquisition systems. References to those results are listed. The future prospects towards the gridification of GATE and its extension to other domains such as dosimetry are also discussed.
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Affiliation(s)
- S Jan
- Service Hospitalier Frédéric Joliot, CEA, F-91401 Orsay, France
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Jan S, Santin G, Strul D, Staelens S, Assié K, Autret D, Avner S, Barbier R, Bardiès M, Bloomfield PM, Brasse D, Breton V, Bruyndonckx P, Buvat I, Chatziioannou AF, Choi Y, Chung YH, Comtat C, Donnarieix D, Ferrer L, Glick SJ, Groiselle CJ, Guez D, Honore PF, Kerhoas-Cavata S, Kirov AS, Kohli V, Koole M, Krieguer M, van der Laan DJ, Lamare F, Largeron G, Lartizien C, Lazaro D, Maas MC, Maigne L, Mayet F, Melot F, Merheb C, Pennacchio E, Perez J, Pietrzyk U, Rannou FR, Rey M, Schaart DR, Schmidtlein CR, Simon L, Song TY, Vieira JM, Visvikis D, Van de Walle R, Wieërs E, Morel C. GATE: a simulation toolkit for PET and SPECT. Phys Med Biol 2004; 49:4543-61. [PMID: 15552416 PMCID: PMC3267383 DOI: 10.1088/0031-9155/49/19/007] [Citation(s) in RCA: 837] [Impact Index Per Article: 41.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Monte Carlo simulation is an essential tool in emission tomography that can assist in the design of new medical imaging devices, the optimization of acquisition protocols and the development or assessment of image reconstruction algorithms and correction techniques. GATE, the Geant4 Application for Tomographic Emission, encapsulates the Geant4 libraries to achieve a modular, versatile, scripted simulation toolkit adapted to the field of nuclear medicine. In particular, GATE allows the description of time-dependent phenomena such as source or detector movement, and source decay kinetics. This feature makes it possible to simulate time curves under realistic acquisition conditions and to test dynamic reconstruction algorithms. This paper gives a detailed description of the design and development of GATE by the OpenGATE collaboration, whose continuing objective is to improve, document and validate GATE by simulating commercially available imaging systems for PET and SPECT. Large effort is also invested in the ability and the flexibility to model novel detection systems or systems still under design. A public release of GATE licensed under the GNU Lesser General Public License can be downloaded at http:/www-lphe.epfl.ch/GATE/. Two benchmarks developed for PET and SPECT to test the installation of GATE and to serve as a tutorial for the users are presented. Extensive validation of the GATE simulation platform has been started, comparing simulations and measurements on commercially available acquisition systems. References to those results are listed. The future prospects towards the gridification of GATE and its extension to other domains such as dosimetry are also discussed.
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Affiliation(s)
- S. Jan
- Service Hospitalier Frédéric Joliot (SHFJ), CEA, F-91401 Orsay, France
| | - G. Santin
- LPHE, Swiss Federal Institute of Technology (EPFL), CH-1015 Lausanne, Switzerland
| | - D. Strul
- LPHE, Swiss Federal Institute of Technology (EPFL), CH-1015 Lausanne, Switzerland
| | - S. Staelens
- ELIS, Ghent University, B-9000 Ghent, Belgium
| | - K. Assié
- INSERM U494, CHU Pitié-Salpêtrière, F-75634 Paris, France
| | - D. Autret
- INSERM U601, CHU Nantes, F-44093 Nantes, France
| | - S. Avner
- Institut de Recherches Subatomiques, CNRS/IN2P3 et Université Louis Pasteur, F-67037 Strasbourg, France
| | - R. Barbier
- Institut de Physique Nucléaire de Lyon, CNRS/IN2P3 et Université Claude Bernard, F-69622 Villeurbanne, France
| | - M. Bardiès
- INSERM U601, CHU Nantes, F-44093 Nantes, France
| | - P. M. Bloomfield
- PET Group, Centre for Addiction and Mental Health, Toronto, Ontario M5T 1R8, Canada
| | - D. Brasse
- Institut de Recherches Subatomiques, CNRS/IN2P3 et Université Louis Pasteur, F-67037 Strasbourg, France
| | - V. Breton
- Laboratoire de Physique Corpusculaire, CNRS/IN2P3, Université Blaise Pascal, Campus des Cézeaux, F-63177 Aubière, France
| | - P. Bruyndonckx
- Inter-University Institute for High Energies, Vrije Universiteit Brussel, B-1050 Brussel, Belgium
| | - I. Buvat
- INSERM U494, CHU Pitié-Salpêtrière, F-75634 Paris, France
| | - A. F. Chatziioannou
- Crump Institute for Molecular Imaging, University of California, Los Angeles, Califronia 90095-1770, USA
| | - Y. Choi
- Department of Nuclear Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 135-710, Korea
| | - Y. H. Chung
- Department of Nuclear Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 135-710, Korea
| | - C. Comtat
- Service Hospitalier Frédéric Joliot (SHFJ), CEA, F-91401 Orsay, France
| | - D. Donnarieix
- Laboratoire de Physique Corpusculaire, CNRS/IN2P3, Université Blaise Pascal, Campus des Cézeaux, F-63177 Aubière, France
- Département de Curiethérapie-Radiothérapie, Centre Jean Perrin, F-63000 Clermont-Ferrand, France
| | - L. Ferrer
- INSERM U601, CHU Nantes, F-44093 Nantes, France
| | - S. J. Glick
- University of Massachusetts Medical School, Division of Nuclear Medicine, Worcester, MA 01655, USA
| | - C. J. Groiselle
- University of Massachusetts Medical School, Division of Nuclear Medicine, Worcester, MA 01655, USA
| | - D. Guez
- DAPNIA, CEA Saclay, F-91191 Gif-Sur-Yvette, France
| | - P.-F. Honore
- DAPNIA, CEA Saclay, F-91191 Gif-Sur-Yvette, France
| | | | - A. S. Kirov
- Department of Medical Physics, Memorial Sloan-Kettering Cancer Center, New York, NY 10021, USA
| | - V. Kohli
- Crump Institute for Molecular Imaging, University of California, Los Angeles, Califronia 90095-1770, USA
| | - M. Koole
- ELIS, Ghent University, B-9000 Ghent, Belgium
| | - M. Krieguer
- Inter-University Institute for High Energies, Vrije Universiteit Brussel, B-1050 Brussel, Belgium
| | - D. J. van der Laan
- Delft University of Technology, IRI, Radiation Technology, 2629 JB Delft, The Netherlands
| | - F. Lamare
- INSERM U650, Laboratoire de Traitement de l’Information Médicale (LATIM), CHU Morvan, F-29609 Brest, France
| | - G. Largeron
- Institut de Physique Nucléaire de Lyon, CNRS/IN2P3 et Université Claude Bernard, F-69622 Villeurbanne, France
| | - C. Lartizien
- ANIMAGE-CERMEP, Université Claude Bernard Lyon 1, F-69003 Lyon, France
| | - D. Lazaro
- Laboratoire de Physique Corpusculaire, CNRS/IN2P3, Université Blaise Pascal, Campus des Cézeaux, F-63177 Aubière, France
| | - M. C. Maas
- Delft University of Technology, IRI, Radiation Technology, 2629 JB Delft, The Netherlands
| | - L. Maigne
- Laboratoire de Physique Corpusculaire, CNRS/IN2P3, Université Blaise Pascal, Campus des Cézeaux, F-63177 Aubière, France
| | - F. Mayet
- Laboratoire de Physique Subatomique et de Cosmologie, CNRS/IN2P3 et Université Joseph Fourier, F-38026 Grenoble, France
| | - F. Melot
- Laboratoire de Physique Subatomique et de Cosmologie, CNRS/IN2P3 et Université Joseph Fourier, F-38026 Grenoble, France
| | - C. Merheb
- DAPNIA, CEA Saclay, F-91191 Gif-Sur-Yvette, France
| | - E. Pennacchio
- Institut de Physique Nucléaire de Lyon, CNRS/IN2P3 et Université Claude Bernard, F-69622 Villeurbanne, France
| | - J. Perez
- Institute of Medicine, Forschungszemtrum Juelich, D-52425 Juelich, Germany
| | - U. Pietrzyk
- Institute of Medicine, Forschungszemtrum Juelich, D-52425 Juelich, Germany
| | - F. R. Rannou
- Crump Institute for Molecular Imaging, University of California, Los Angeles, Califronia 90095-1770, USA
- Departamento de Ingenieria Informatica, Universidad de Santiago de Chile, Santiago, Chile
| | - M. Rey
- LPHE, Swiss Federal Institute of Technology (EPFL), CH-1015 Lausanne, Switzerland
| | - D. R. Schaart
- Delft University of Technology, IRI, Radiation Technology, 2629 JB Delft, The Netherlands
| | - C. R. Schmidtlein
- Department of Medical Physics, Memorial Sloan-Kettering Cancer Center, New York, NY 10021, USA
| | - L. Simon
- LPHE, Swiss Federal Institute of Technology (EPFL), CH-1015 Lausanne, Switzerland
| | - T. Y. Song
- Department of Nuclear Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 135-710, Korea
| | - J.-M. Vieira
- LPHE, Swiss Federal Institute of Technology (EPFL), CH-1015 Lausanne, Switzerland
| | - D. Visvikis
- INSERM U650, Laboratoire de Traitement de l’Information Médicale (LATIM), CHU Morvan, F-29609 Brest, France
| | | | - E. Wieërs
- Inter-University Institute for High Energies, Vrije Universiteit Brussel, B-1050 Brussel, Belgium
- Nucleair Technologisch Centrum, Dept. Industriële Wetenschappen en Technologie, Hogeschool Limburg, B-3590 Diepenbeek, Belgium
| | - C. Morel
- LPHE, Swiss Federal Institute of Technology (EPFL), CH-1015 Lausanne, Switzerland
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