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Hoog C, Verrecchia-Ramos E, Dejust S, Lalire P, Sezin G, Moubtakir A, El Farsaoui K, Caquot PA, Guendouzen S, Morland D, Papathanassiou D. Implementation of xSPECT, xSPECT bone and Broadquant from literature, clinical survey and innovative phantom study with task-based image quality assessment. Phys Med 2023; 112:102611. [PMID: 37329742 DOI: 10.1016/j.ejmp.2023.102611] [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] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/18/2022] [Revised: 04/19/2023] [Accepted: 05/30/2023] [Indexed: 06/19/2023] Open
Abstract
OBJECTIVE From patient and phantom studies, we aimed to highlight an original implementation process and share a two-years experience clinical feedback on xSPECT (xS), xSPECT Bone (xB) and Broadquant quantification (Siemens) for 99mTc-bone and 177Lu-NET (neuroendocrine tumors) imaging. METHODS Firstly, we checked the relevance of implemented protocols and Broadquant module on the basis of literature and with a homogeneous phantom study respectively. Then, we described xS and xB behaviours with reconstruction parameters (10i-0mm to 40i-20mm) and optimized the protocols through a blinded survey (7 physicians). Finally, the preferred 99mTc-bone reconstruction was assessed through an IEC NEMA phantom including liquid bone spheres. Conventional SNR, CNR, spatial resolution, Q.%error, and recovery curves; and innovative NPS, TTF and detectability score d' were performed (ImQuest software). We also sought to review the adoption of these tools in clinical routine and showed the potential of quantitative xB in the context of theranostics (Xofigo®). RESULTS We showed the need of optimization of implemented reconstruction algorithms and pointed out a decay correction particularity with Broadquant. Preferred parameters were 1s-25i-8mm and 1s-25i-5mm for xS/xB-bone and xS-NET imaging respectively. The phantom study highlighted the different image quality especially for the enhanced spatial resolution xB algorithm (1/TTF10%=2.1 mm) and showed F3D and xB shared the best performances in terms of image quality and quantification. xS was generally less efficient. CONCLUSIONS Qualitative F3D still remains the clinical standard, xB and Broadquant offer challenging perspectives in theranostics. We introduced the potential of innovative metrics for image quality analysis and showed how CT tools should be adapted to fit nuclear medicine imaging.
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Affiliation(s)
| | | | | | - Paul Lalire
- Nuclear Medicine Department, Institut Godinot, Reims, France
| | - Ghali Sezin
- Nuclear Medicine Department, Institut Godinot, Reims, France
| | | | | | | | | | - David Morland
- Nuclear Medicine Department, Institut Godinot, Reims, France; UFR de médecine, université de Reims-Champagne Ardenne, 1, rue Cognacq-Jay, 51095 Reims cedex, France; CReSTIC Centre de recherche en sciences et technologies de l'information et de la communication, EA 3804, université de Reims-Champagne Ardenne, Moulin de la Housse, BP 1039, 51687 Reims Cedex 2, France
| | - Dimitri Papathanassiou
- Nuclear Medicine Department, Institut Godinot, Reims, France; UFR de médecine, université de Reims-Champagne Ardenne, 1, rue Cognacq-Jay, 51095 Reims cedex, France; CReSTIC Centre de recherche en sciences et technologies de l'information et de la communication, EA 3804, université de Reims-Champagne Ardenne, Moulin de la Housse, BP 1039, 51687 Reims Cedex 2, France
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Morland D, Triumbari EKA, Hoog C, Sézin G, Dejust S, Cadiot G, Paris P, Papathanassiou D. Predicting subacute hematological toxicity of 177Lu-DOTATATE therapy using healthy organs' uptake on post-treatment quantitative SPECT: A pilot study. Medicine (Baltimore) 2022; 101:e32212. [PMID: 36626520 PMCID: PMC9750522 DOI: 10.1097/md.0000000000032212] [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] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
The aim is to investigate the usefulness of 177Lu-DOTA-0-Tyr3-Octreotate (DOTATATE) healthy organs' (spleen, kidneys, bone marrow) standard uptake value for the prediction of subacute hematological toxicity in patients undergoing 177Lu-DOTATATE treatment. All patients referred from January 2021 to May 2022 for 177Lu-DOTATATE treatment were retrospectively screened. For each treatment session, baseline clinical data including age, sex, weight, delay between 177Lu-DOTATATE treatment and last cold somatostatin analogue intake were collected. Mean standardized uptake value (SUVmean) of healthy organs was measured and analyzed by generalized linear mixed effect models. Outcomes (significant decrease of platelets, hemoglobin levels and neutrophils) were assessed 1 month later, considering their within-subject biological coefficient of variation, published by the European Federation of Clinical Chemistry and Laboratory Medicine. A total of 9 patients (33 treatment sessions) were included. No predictive factors were identified for platelet and neutrophil decrease. Splenic SUVmean was found to be a significant predictor of hemoglobin levels decrease. Using an optimal threshold of ≥6.22, derived sensitivity and specificity to predict hemoglobin decrease were 85.7% [46.4; 99.0] and 76.9% [57.5; 89.2] respectively with an accuracy of 82.4%. Although not significantly predictive of hematological toxicity, bone marrow SUVmean and renal SUVmean were correlated with splenic SUVmean. Quantitative single photon emission computed tomography and healthy organs analysis might help to foresee hematological subacute toxicity in patients undergoing 177Lu-DOTATATE treatment and improve patient management.
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Affiliation(s)
- David Morland
- Service de Médecine Nucléaire, Institut Godinot, Reims, France
- Laboratoire de Biophysique, UFR de Médecine, Université de Reims Champagne-Ardenne, Reims, France
- CReSTIC (Centre de Recherche en Sciences et Technologies de l’Information et de la Communication), EA 3804, Université de Reims Champagne-Ardenne, Reims, France
- Unità di Medicina Nucleare, TracerGLab, Dipartimento di Radiologia, Radioterapia ed Ematologia, Fondazione Policlinico Universitario A. Gemelli, IRCCS, Roma, Italia
- * Correspondence: David Morland, Service de Médecine Nucléaire, Institut Godinot, 1 rue du général Koenig, Reims 51100, France (e-mail: )
| | - Elizabeth Katherine Anna Triumbari
- Unità di Medicina Nucleare, TracerGLab, Dipartimento di Radiologia, Radioterapia ed Ematologia, Fondazione Policlinico Universitario A. Gemelli, IRCCS, Roma, Italia
| | - Christopher Hoog
- Service de Radiophysique et Radioprotection, Institut Godinot, Reims, France
| | - Ghali Sézin
- Service de Médecine Nucléaire, Institut Godinot, Reims, France
| | | | - Guillaume Cadiot
- Hépatogastroentérologie, Université de Reims Champagne-Ardenne and Hôpital Robert Debré, CHU de Reims, Reims, France
| | | | - Dimitri Papathanassiou
- Service de Médecine Nucléaire, Institut Godinot, Reims, France
- Laboratoire de Biophysique, UFR de Médecine, Université de Reims Champagne-Ardenne, Reims, France
- CReSTIC (Centre de Recherche en Sciences et Technologies de l’Information et de la Communication), EA 3804, Université de Reims Champagne-Ardenne, Reims, France
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Hoog C, Koulibaly PM, Dejean C, Desdoits T, Humbert O, Barranger E, Darcourt J. Comparison of 3 γ-probes for simultaneous iodine-125-seed and technetium-99m breast cancer surgery: NEMA standard characterisation with extended processing. EJNMMI Phys 2020; 7:37. [PMID: 32504305 PMCID: PMC7275111 DOI: 10.1186/s40658-020-00299-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2019] [Accepted: 04/27/2020] [Indexed: 11/15/2022] Open
Abstract
Purpose Iodine-125 (125I) seeds can be used as landmarks to locate non-palpable breast lesions instead of implanting metal wires. This relatively new technique requires a nuclear probe usually used for technetium-99m (99mTc) sentinel node detection. This study aimed to compare the performances of different probes and valid the feasibility of this technique, especially in the case of simultaneous 125I-seed and 99mTc breast cancer surgery. Methods Three probes with different features (SOE-3211, SOE-3214 and GammaSUP-II) were characterised according to the NEMA NU3-2004 standards for a 99mTc source and a 125I-seed. Several tests such as sensitivity, linearity or spatial resolution allowed an objective comparison of their performances. NEMA testing was extended to work on signals discrimination in case of simultaneous detection of two different sources (innovative figure of merit “Shift Index”) and to assess the 99mTc scatter fraction, a useful parameter for the improvement of the probes in terms of detector materials and electronic system. Results Although the GammaSUP-II probe saturated at a lower activity (1.6 MBq at 10 mm depth), it allowed better sensitivity and spatial resolution at the different NEMA tests performed with the 99mTc source (7865 cps/MBq and 15 mm FWHM at 10 mm depth). With the 125I-seed, the GammaSUP-II was the most sensitive probe (3106 cps/MBq at 10 mm depth) and the SOE-3211 probe had the best spatial resolution (FWHM 20 mm at 10 mm depth). The SOE-3214 probe was more efficient on discriminating 125I from 99mTc in case of simultaneous detection. The SOE probes were more efficient concerning 99mTc scatter fraction assessments. The SOE-3211 probe, with overall polyvalent performances, seemed to be an interesting trade-off for detection of both 125I and 99mTc. Conclusion The three probes showed heterogeneous performances but were all suitable for simultaneous 99mTc sentinel node and 125I-seed detection. This study provides an objective and innovative methodology to compare probes performances and then choose the best trade-off regarding their expected use.
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Affiliation(s)
- Christopher Hoog
- Department of diagnostic radiology and nuclear medicine, Antoine Lacassagne Comprehensive Cancer Center, Université Nice-Côte d'Azur, 33 Avenue de Valombrose, 06189, Nice, France.
| | - Pierre-Malick Koulibaly
- Department of diagnostic radiology and nuclear medicine, Antoine Lacassagne Comprehensive Cancer Center, Université Nice-Côte d'Azur, 33 Avenue de Valombrose, 06189, Nice, France
| | - Catherine Dejean
- Department of worker radiation protection, Antoine Lacassagne Comprehensive Cancer Center, Université Nice-Côte d'Azur, 33 Avenue de Valombrose, 06189, Nice, France
| | - Tom Desdoits
- Department of diagnostic radiology and nuclear medicine, Antoine Lacassagne Comprehensive Cancer Center, Université Nice-Côte d'Azur, 33 Avenue de Valombrose, 06189, Nice, France
| | - Olivier Humbert
- Department of diagnostic radiology and nuclear medicine, Antoine Lacassagne Comprehensive Cancer Center, Université Nice-Côte d'Azur, 33 Avenue de Valombrose, 06189, Nice, France
| | - Emmanuel Barranger
- Department of oncological, gynaecological and breast surgery, Antoine Lacassagne Comprehensive Cancer Center, Université Nice-Côte d'Azur, 33 Avenue de Valombrose, 06189, Nice, France
| | - Jacques Darcourt
- Department of diagnostic radiology and nuclear medicine, Antoine Lacassagne Comprehensive Cancer Center, Université Nice-Côte d'Azur, 33 Avenue de Valombrose, 06189, Nice, France
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Hafsi M, Preveral S, Hoog C, Hérault J, Perrier GA, Lefèvre CT, Michel H, Pignol D, Doyen J, Pourcher T, Humbert O, Thariat J, Cambien B. RGD-functionalized magnetosomes are efficient tumor radioenhancers for X-rays and protons. Nanomedicine 2019; 23:102084. [PMID: 31454552 DOI: 10.1016/j.nano.2019.102084] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2019] [Revised: 07/23/2019] [Accepted: 08/04/2019] [Indexed: 02/03/2023]
Abstract
Although chemically synthesized ferro/ferrimagnetic nanoparticles have attracted great attention in cancer theranostics, they lack radio-enhancement efficacy due to low targeting and internalization ability. Herein, we investigated the potential of RGD-tagged magnetosomes, bacterial biogenic magnetic nanoparticles naturally coated with a biological membrane and genetically engineered to express an RGD peptide, as tumor radioenhancers for conventional radiotherapy and proton therapy. Although native and RGD-magnetosomes similarly enhanced radiation-induced damage to plasmid DNA, RGD-magnetoprobes were able to boost the efficacy of radiotherapy to a much larger extent than native magnetosomes both on cancer cells and in tumors. Combined to magnetosomes@RGD, proton therapy exceeded the efficacy of X-rays at equivalent doses. Also, increased secondary emissions were measured after irradiation of magnetosomes with protons versus photons. Our results indicate the therapeutic advantage of using functionalized magnetoparticles to sensitize tumors to both X-rays and protons and strengthen the case for developing biogenic magnetoparticles for multimodal nanomedicine in cancer therapy.
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Affiliation(s)
- Maha Hafsi
- Laboratoire TIRO, UMRE 4320, BIAM, DRT, CEA, Nice Côte d'Azur University, France
| | - Sandra Preveral
- Laboratoire de Bioénergétique Cellulaire, Institute of Biosciences and Biotechnologies of Aix Marseille (BIAM), Saint-Paul-lez-Durance, France
| | - Christopher Hoog
- Department of Radiology, Centre Antoine Lacassagne, Nice Côte d'Azur University, France; Federation Claude Lalanne, Nice Côte d'Azur University, France
| | - Joel Hérault
- Department of Radiation Therapy, Proton Therapy Center, Centre Antoine Lacassagne, Nice Côte d'Azur University, France; Federation Claude Lalanne, Nice Côte d'Azur University, France
| | - Géraldine Adryanczyk Perrier
- Laboratoire de Bioénergétique Cellulaire, Institute of Biosciences and Biotechnologies of Aix Marseille (BIAM), Saint-Paul-lez-Durance, France
| | - Christopher T Lefèvre
- Laboratoire de Bioénergétique Cellulaire, Institute of Biosciences and Biotechnologies of Aix Marseille (BIAM), Saint-Paul-lez-Durance, France
| | - Hervé Michel
- Institut de Chimie de Nice, UMR7272, Nice Côte d'Azur University, France
| | - David Pignol
- Laboratoire de Bioénergétique Cellulaire, Institute of Biosciences and Biotechnologies of Aix Marseille (BIAM), Saint-Paul-lez-Durance, France
| | - Jérôme Doyen
- Department of Radiation Therapy, Proton Therapy Center, Centre Antoine Lacassagne, Nice Côte d'Azur University, France; Federation Claude Lalanne, Nice Côte d'Azur University, France
| | - Thierry Pourcher
- Laboratoire TIRO, UMRE 4320, BIAM, DRT, CEA, Nice Côte d'Azur University, France; Federation Claude Lalanne, Nice Côte d'Azur University, France
| | - Olivier Humbert
- Laboratoire TIRO, UMRE 4320, BIAM, DRT, CEA, Nice Côte d'Azur University, France; Department of Nuclear Medicine, Centre Antoine Lacassagne, Nice Côte d'Azur University, France
| | - Juliette Thariat
- Department of Radiology, Centre Antoine Lacassagne, Nice Côte d'Azur University, France; Department of Radiation Therapy, Proton Therapy Center, Centre Antoine Lacassagne, Nice Côte d'Azur University, France; Department of Radiation Oncology, Centre François Baclesse, Université de Normandie, France
| | - Béatrice Cambien
- Laboratoire TIRO, UMRE 4320, BIAM, DRT, CEA, Nice Côte d'Azur University, France; Federation Claude Lalanne, Nice Côte d'Azur University, France.
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Moreau B, Iannessi A, Hoog C, Beaumont H. How reliable are ADC measurements? A phantom and clinical study of cervical lymph nodes. Eur Radiol 2018; 28:3362-3371. [PMID: 29476218 PMCID: PMC6028847 DOI: 10.1007/s00330-017-5265-2] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2017] [Revised: 12/11/2017] [Accepted: 12/20/2017] [Indexed: 12/11/2022]
Abstract
Objective To assess the reliability of ADC measurements in vitro and in cervical lymph nodes of healthy volunteers. Methods We used a GE 1.5 T MRI scanner and a first ice-water phantom according to recommendations released by the Quantitative Imaging Biomarker Alliance (QIBA) for assessing ADC against reference values. We analysed the target size effect by using a second phantom made of six inserted spheres with diameters ranging from 10 to 37 mm. Thirteen healthy volunteers were also scanned to assess the inter- and intra-observer reproducibility of volumetric ADC measurements of cervical lymph nodes. Results On the ice-water phantom, the error in ADC measurements was less than 4.3 %. The spatial bias due to the non-linearity of gradient fields was found to be 24 % at 8 cm from the isocentre. ADC measure reliability decreased when addressing small targets due to partial volume effects (up to 12.8 %). The mean ADC value of cervical lymph nodes was 0.87.10-3 ± 0.12.10-3 mm2/s with a good intra-observer reliability. Inter-observer reproducibility featured a bias of -5.5 % due to segmentation issues. Conclusion ADC is a potentially important imaging biomarker in oncology; however, variability issues preclude its broader adoption. Reliable use of ADC requires technical advances and systematic quality control. Key Points • ADC is a promising quantitative imaging biomarker. • ADC has a fair inter-reader variability and good intra-reader variability. • Partial volume effect, post-processing software and non-linearity of scanners are limiting factors. • No threshold values for detecting cervical lymph node malignancy can be drawn. Electronic supplementary material The online version of this article (10.1007/s00330-017-5265-2) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Bastien Moreau
- Department of Radiology, Centre Antoine Lacassagne, 06100, Nice, France
| | - Antoine Iannessi
- Department of Radiology, Centre Antoine Lacassagne, 06100, Nice, France
| | - Christopher Hoog
- Department of Radiology, Centre Antoine Lacassagne, 06100, Nice, France
| | - Hubert Beaumont
- Research and Development Department, Median Technologies, Les deux arcs - 1800 route des crêtes - Bat. B, 06560, Valbonne, France.
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de Las Heras Gala H, Torresin A, Dasu A, Rampado O, Delis H, Hernández Girón I, Theodorakou C, Andersson J, Holroyd J, Nilsson M, Edyvean S, Gershan V, Hadid-Beurrier L, Hoog C, Delpon G, Sancho Kolster I, Peterlin P, Garayoa Roca J, Caprile P, Zervides C. Quality control in cone-beam computed tomography (CBCT) EFOMP-ESTRO-IAEA protocol (summary report). Phys Med 2017; 39:67-72. [PMID: 28602688 DOI: 10.1016/j.ejmp.2017.05.069] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/22/2017] [Accepted: 05/24/2017] [Indexed: 10/19/2022] Open
Abstract
The aim of the guideline presented in this article is to unify the test parameters for image quality evaluation and radiation output in all types of cone-beam computed tomography (CBCT) systems. The applications of CBCT spread over dental and interventional radiology, guided surgery and radiotherapy. The chosen tests provide the means to objectively evaluate the performance and monitor the constancy of the imaging chain. Experience from all involved associations has been collected to achieve a consensus that is rigorous and helpful for the practice. The guideline recommends to assess image quality in terms of uniformity, geometrical precision, voxel density values (or Hounsfield units where available), noise, low contrast resolution and spatial resolution measurements. These tests usually require the use of a phantom and evaluation software. Radiation output can be determined with a kerma-area product meter attached to the tube case. Alternatively, a solid state dosimeter attached to the flat panel and a simple geometric relationship can be used to calculate the dose to the isocentre. Summary tables including action levels and recommended frequencies for each test, as well as relevant references, are provided. If the radiation output or image quality deviates from expected values, or exceeds documented action levels for a given system, a more in depth system analysis (using conventional tests) and corrective maintenance work may be required.
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Affiliation(s)
| | - Alberto Torresin
- Education and Training Chairperson of EFOMP, ASST Grande Ospedale Metropolitano Niguarda, Milano, Italy
| | - Alexandru Dasu
- The Skandion Clinic, Uppsala, Sweden; Linköping University, Linköping, Sweden
| | | | - Harry Delis
- International Atomic Energy Agency, Vienna, Austria
| | | | | | - Jonas Andersson
- Department of Radiation Sciences, Radiation Physics, University of Umeå, Umeå, Sweden
| | | | | | - Sue Edyvean
- Public Health England (PHE), Chilton, Didcot, Oxfordshire, UK
| | - Vesna Gershan
- Faculty of Natural Sciences and Mathematics, Skopje, Macedonia
| | | | | | | | | | | | | | - Paola Caprile
- Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Costas Zervides
- Zervides Radiation Protection Services, Limassol, Cyprus; University of Nicosia, Medical School, Nicosia, Cyprus
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Beaumont H, Moreau B, Hoog C, Oubel E, Iannessi A. Reliability of apparent diffusion coefficient assessments according to the QIBA guideline. Ann Oncol 2016. [DOI: 10.1093/annonc/mdw392.52] [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: 11/14/2022] Open
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Lorsakul A, Li Q, Trott CM, Hoog C, Petibon Y, Ouyang J, Laine AF, El Fakhri G. 4D numerical observer for lesion detection in respiratory-gated PET. Med Phys 2014; 41:102504. [PMID: 25281979 DOI: 10.1118/1.4895975] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
PURPOSE Respiratory-gated positron emission tomography (PET)/computed tomography protocols reduce lesion smearing and improve lesion detection through a synchronized acquisition of emission data. However, an objective assessment of image quality of the improvement gained from respiratory-gated PET is mainly limited to a three-dimensional (3D) approach. This work proposes a 4D numerical observer that incorporates both spatial and temporal informations for detection tasks in pulmonary oncology. METHODS The authors propose a 4D numerical observer constructed with a 3D channelized Hotelling observer for the spatial domain followed by a Hotelling observer for the temporal domain. Realistic (18)F-fluorodeoxyglucose activity distributions were simulated using a 4D extended cardiac torso anthropomorphic phantom including 12 spherical lesions at different anatomical locations (lower, upper, anterior, and posterior) within the lungs. Simulated data based on Monte Carlo simulation were obtained using geant4 application for tomographic emission (GATE). Fifty noise realizations of six respiratory-gated PET frames were simulated by GATE using a model of the Siemens Biograph mMR scanner geometry. PET sinograms of the thorax background and pulmonary lesions that were simulated separately were merged to generate different conditions of the lesions to the background (e.g., lesion contrast and motion). A conventional ordered subset expectation maximization (OSEM) reconstruction (5 iterations and 6 subsets) was used to obtain: (1) gated, (2) nongated, and (3) motion-corrected image volumes (a total of 3200 subimage volumes: 2400 gated, 400 nongated, and 400 motion-corrected). Lesion-detection signal-to-noise ratios (SNRs) were measured in different lesion-to-background contrast levels (3.5, 8.0, 9.0, and 20.0), lesion diameters (10.0, 13.0, and 16.0 mm), and respiratory motion displacements (17.6-31.3 mm). The proposed 4D numerical observer applied on multiple-gated images was compared to the conventional 3D approach applied on the nongated and motion-corrected images. RESULTS On average, the proposed 4D numerical observer improved the detection SNR by 48.6% (p < 0.005), whereas the 3D methods on motion-corrected images improved by 31.0% (p < 0.005) as compared to the nongated method. For all different conditions of the lesions, the relative SNR measurement (Gain = SNRObserved/SNRNongated) of the 4D method was significantly higher than one from the motion-corrected 3D method by 13.8% (p < 0.02), where Gain4D was 1.49 ± 0.21 and Gain3D was 1.31 ± 0.15. For the lesion with the highest amplitude of motion, the 4D numerical observer yielded the highest observer-performance improvement (176%). For the lesion undergoing the smallest motion amplitude, the 4D method provided superior lesion detectability compared with the 3D method, which provided a detection SNR close to the nongated method. The investigation on a structure of the 4D numerical observer showed that a Laguerre-Gaussian channel matrix with a volumetric 3D function yielded higher lesion-detection performance than one with a 2D-stack-channelized function, whereas a different kind of channels that have the ability to mimic the human visual system, i.e., difference-of-Gaussian, showed similar performance in detecting uniform and spherical lesions. The investigation of the detection performance when increasing noise levels yielded decreasing detection SNR by 27.6% and 41.5% for the nongated and gated methods, respectively. The investigation of lesion contrast and diameter showed that the proposed 4D observer preserved the linearity property of an optimal-linear observer while the motion was present. Furthermore, the investigation of the iteration and subset numbers of the OSEM algorithm demonstrated that these parameters had impact on the lesion detectability and the selection of the optimal parameters could provide the maximum lesion-detection performance. The proposed 4D numerical observer outperformed the other observers for the lesion-detection task in various lesion conditions and motions. CONCLUSIONS The 4D numerical observer shows substantial improvement in lesion detectability over the 3D observer method. The proposed 4D approach could potentially provide a more reliable objective assessment of the impact of respiratory-gated PET improvement for lesion-detection tasks. On the other hand, the 4D approach may be used as an upper bound to investigate the performance of the motion correction method. In future work, the authors will validate the proposed 4D approach on clinical data for detection tasks in pulmonary oncology.
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Affiliation(s)
- Auranuch Lorsakul
- Center for Advanced Medical Imaging Sciences, Division of Nuclear Medicine and Molecular Imaging, Massachusetts General Hospital, Boston, Massachusetts 02114 and Department of Biomedical Engineering, Columbia University, New York, New York 10027
| | - Quanzheng Li
- Center for Advanced Medical Imaging Sciences, Division of Nuclear Medicine and Molecular Imaging, Massachusetts General Hospital, Boston, Massachusetts 02114 and Department of Radiology, Harvard Medical School, Boston, Massachusetts 02115
| | - Cathryn M Trott
- International Centre for Radio Astronomy Research, Curtin University, Bentley, WA 6102, Australia and ARC Centre of Excellence for All-Sky Astrophysics (CAASTRO), Redfem, NSW 2016, Australia
| | - Christopher Hoog
- Center for Advanced Medical Imaging Sciences, Division of Nuclear Medicine and Molecular Imaging, Massachusetts General Hospital, Boston, Massachusetts 02114
| | - Yoann Petibon
- Center for Advanced Medical Imaging Sciences, Division of Nuclear Medicine and Molecular Imaging, Massachusetts General Hospital, Boston, Massachusetts 02114
| | - Jinsong Ouyang
- Center for Advanced Medical Imaging Sciences, Division of Nuclear Medicine and Molecular Imaging, Massachusetts General Hospital, Boston, Massachusetts 02114 and Department of Radiology, Harvard Medical School, Boston, Massachusetts 02115
| | - Andrew F Laine
- Department of Biomedical Engineering, Columbia University, New York, New York 10027
| | - Georges El Fakhri
- Center for Advanced Medical Imaging Sciences, Division of Nuclear Medicine and Molecular Imaging, Massachusetts General Hospital, Boston, Massachusetts 02114 and Department of Radiology, Harvard Medical School, Boston, Massachusetts 02115
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Bouilhol G, Benoit C, Hoog C, Pothier G, Gaumier A, Ayadi M. Determination of an oesophagus PRV for the treatments with cyberknife. Phys Med 2013. [DOI: 10.1016/j.ejmp.2013.08.127] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
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Dorenlot A, Hoog C, Tessonnier T, Nomikossoff N, Benkreira M, Portal T. Retrospective of 300 delivery quality assurance of patients treated with the tomotherapy HI-ART 2 using the IBA matrixx-evolution. Phys Med 2013. [DOI: 10.1016/j.ejmp.2013.08.113] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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Kolas NK, Yuan L, Hoog C, Heng HHQ, Marcon E, Moens PB. Male mouse meiotic chromosome cores deficient in structural proteins SYCP3 and SYCP2 align by homology but fail to synapse and have possible impaired specificity of chromatin loop attachment. Cytogenet Genome Res 2005; 105:182-8. [PMID: 15237206 DOI: 10.1159/000078188] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.4] [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: 10/08/2003] [Indexed: 11/19/2022] Open
Abstract
The targeted deletion of the meiotic chromosome core component MmSYCP3 results in chromosome synaptic failure at male meiotic prophase, extended meiotic chromosomes, male sterility, oocyte aneuploidy and absence of the MmSYCP2 chromosome core component. To test the functions of SYCP2 and SYCP3 proteins in the cores, we determined the effect of their deletion on homology recognition by whole chromosome painting and the effect on chromatin loop attachment to the cores with endogenous and exogenous sequences. Because we observed that the alignment of cores is between homologs, it suggested that alignment is not a function of the chromosome core components but might be mediated by chromatin-chromatin interactions. The alignment function therefore appears to be separate from intimate synapsis function of homologous cores that is observed to be defective in the SYCP3-/- males. To examine the functions of the SYCP2 and 3 core proteins in chromatin loop attachment, we measured the loop sizes of the centromeric major satellite chromatin and the organization of an exogenous transgene in SYCP3+/+ and SYCP3-/- males. We observed that these satellite chromatin loops have a normal appearance in SYCP3-/- males, but the loop regulation of a 2-Mb exogenous lambda phage insert appears to be altered. Normally the insert fails to attach to the core except by flanking endogenous sequences, but in the absence of SYCP2 and SYCP3, there appears to be multiple attachments to the core. This suggests that the selective preference for the attachment of mouse sequences to the chromosome core in the wild-type male is impaired in the SYCP3-/- male. Apparently the SYCP2 and SYCP3 proteins function in the specificity of chromatin attachment to the chromosome core.
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Affiliation(s)
- N K Kolas
- Department of Molecular Genetics, Albert Einstein College of Medicine, Bronx, NY, USA
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Daum JR, Tugendreich S, Topper LM, Jorgensen PM, Hoog C, Hieter P, Gorbsky GJ. The 3F3/2 anti-phosphoepitope antibody binds the mitotically phosphorylated anaphase-promoting complex/cyclosome. Curr Biol 2000; 10:R850-2. [PMID: 11114529 DOI: 10.1016/s0960-9822(00)00836-8] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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13
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Jarrous N, Eder PS, Guerrier-Takada C, Hoog C, Altman S. Autoantigenic properties of some protein subunits of catalytically active complexes of human ribonuclease P. RNA 1998; 4:407-417. [PMID: 9630247 PMCID: PMC1369627] [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] [Grants] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
At least six proteins co-purify with human ribonuclease P (RNase P), a tRNA processing ribonucleoprotein. Two of these proteins, Rpp30 and Rpp38, are Th autoantigens. Recombinant Rpp30 and Rpp38 are also recognized by Th sera from systemic sclerosis patients. Two of the other proteins associated with RNase P, Rpp20 and Rpp40, do not cross-react with Th sera. Polyclonal antibodies raised against all four recombinant proteins recognize the corresponding proteins associated with RNase P and precipitate active holoenzyme. Catalytically active RNase P holoenzyme can be separated from the nucleolar and mitochondrial RNA processing endoribonuclease, RNase MRP, even though these two enzymes may share some subunits.
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Affiliation(s)
- N Jarrous
- Department of Biology, Yale University, New Haven, Connecticut 06520, USA
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Kotani S, Tugendreich S, Fujii M, Jorgensen PM, Watanabe N, Hoog C, Hieter P, Todokoro K. PKA and MPF-activated polo-like kinase regulate anaphase-promoting complex activity and mitosis progression. Mol Cell 1998; 1:371-80. [PMID: 9660921 DOI: 10.1016/s1097-2765(00)80037-4] [Citation(s) in RCA: 233] [Impact Index Per Article: 9.0] [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: 11/16/2022]
Abstract
Ubiquitin-mediated proteolysis is the key to cell cycle control. Anaphase-promoting complex/cyclosome (APC) is a ubiquitin ligase that targets cyclin B and factors regulating sister chromatid separation for proteolysis by the proteasome and, consequently, regulates metaphase-anaphase transition and exit from mitosis. Here we report that Cdc2-cyclin B-activated Polo-like kinase (Plk) specifically phosphorylates at least three components of APC and activates APC to ubiquitinate cyclin B in the in vitro-reconstituted system. Conversely, protein kinase A (PKA) phosphorylates two subunits of APC but suppresses APC activity. PKA is superior to Plk in its regulation of APC, and Plk activity peaks whereas PKA activity is falling at metaphase. These results indicate that Plk and PKA regulate mitosis progression by controlling APC activity.
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Affiliation(s)
- S Kotani
- Tsukuba Life Science Center, Institute of Physical and Chemical Research (RIKEN), Japan
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Sundqvist K, Iotsova V, Ziaie S, Wiman K, Hoog C, Grafstrom R. Identification of genes overexpressed in the sqcc/y1 human buccal carcinoma cell-line using the differential display method. Int J Oncol 1995; 7:1123-8. [PMID: 21552941 DOI: 10.3892/ijo.7.5.1123] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Although several oncogenes and tumor suppressor genes have been suggested to be of relevance for the development of oral cancer, it is likely that additional genes are involved in this complex process. Therefore, in an attempt to isolate such genes, the aim of this study was to investigate changes in gene expression in human buccal carcinoma cells as compared to normal buccal epithelial cells, and identify mRNA overexpressed in the carcinoma cell line. The method of differential display of mRNA was used to isolate differentially expressed genes (Liang P et al, Science 257:967-971, 1992). A key step of this method, a polymerase chain reaction amplification, was optimized in terms of choice of thermostable DNA polymerase, annealing temperature, molar ratios and concentrations of primers. The comparative analysis of expression in tumor and normal buccal epithelial cells led to the isolation of three different mRNAs overexpressed in human oral carcinoma cells, as confirmed by Northern blot analysis. Cloning and sequence analysis revealed that these genes, which were termed OTEX as in Oral Tumor EXpressed, included a novel, previously not characterized, human gene, OTEX-1. OTEX-2 was identical to the gene coding for the L26 ribosomal protein, a protein known to be overexpressed also in other tumor cell types. OTEX-3 showed a perfect match to a sequence isolated during the human genome sequencing project, with a hitherto unknown function.
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Affiliation(s)
- K Sundqvist
- KAROLINSKA INST,INST ENVIRONM MED,S-17177 STOCKHOLM,SWEDEN. KAROLINSKA INST,CTR MICROBIOL & TUMOR BIOL,S-17177 STOCKHOLM,SWEDEN. KAROLINSKA INST,DEPT CELL & MOLEC BIOL,MOLEC GENET LAB,S-17177 STOCKHOLM,SWEDEN
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Muller C, Hamm C, Hoog C, Opie L, Gihwala D, Pineda C. Bucindolol a new beta-antagonist decreased the incidence of ventricular fibrillation in open-chest pigs with anterior descending coronary artery ligation. J Mol Cell Cardiol 1983. [DOI: 10.1016/0022-2828(83)90964-1] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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