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Papp D, Elders B, Wielopolski PA, Kotek G, Vogel M, Tiddens HAWM, Ciet P, Hernandez-Tamames JA. Lung parenchyma and structure visualisation in paediatric chest MRI: a comparison of different short and ultra-short echo time protocols. Clin Radiol 2023; 78:e319-e327. [PMID: 36746723 DOI: 10.1016/j.crad.2022.12.020] [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] [Received: 09/30/2022] [Accepted: 12/23/2022] [Indexed: 01/22/2023]
Abstract
AIM To evaluate image quality acquired at lung imaging using magnetic resonance imaging (MRI) sequences using short and ultra-short (UTE) echo times (TEs) with different acquisition strategies (breath-hold, prospective, and retrospective gating) in paediatric patients and in healthy volunteers. MATERIALS AND METHODS End-inspiratory and end-expiratory three-dimensional (3D) spoiled gradient (SPGR3D) and 3D zero echo-time (ZTE3D), and 3D UTE free-breathing (UTE3D), prospective projection navigated radial ZTE3D (ZTE3D vnav), and four-dimensional ZTE (ZTE4D) were performed using a 1.5 T MRI system. For quantitative assessment, the contrast-to-noise ratio (CNR) and signal-to-noise ratio (SNR) values were calculated. To evaluate image quality, qualitative scoring was undertaken on all sequences to evaluate depiction of intrapulmonary vessels, fissures, bronchi, imaging noise, artefacts, and overall acceptability. RESULTS Eight cystic fibrosis (CF) patients (median age 14 years, range 13-17 years), seven children with history of prematurity with or without bronchopulmonary dysplasia (BPD; median 10 years, range 10-11 years), and 10 healthy volunteers (median 32 years, range 20-52 years) were included in the study. ZTE3D vnav provided the most reliable output in terms of image quality, although scan time was highly dependent on navigator triggering efficiency and respiratory pattern. CONCLUSIONS Best image quality was achieved with prospective ZTE3D and UTE3D readouts both in children and volunteers. The current implementation of retrospective ZTE3D readout (ZTE4D) did not provide diagnostic image quality but rather introduced artefacts over the entire imaging volume mimicking lung pathology.
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Affiliation(s)
- D Papp
- Department of Radiology and Nuclear Medicine, Erasmus Medical Centre, Rotterdam, the Netherlands.
| | - B Elders
- Department of Radiology and Nuclear Medicine, Erasmus Medical Centre, Rotterdam, the Netherlands; Department of Paediatric Pulmonology and Allergology, Erasmus Medical Centre-Sophia Children's Hospital, Rotterdam, the Netherlands
| | - P A Wielopolski
- Department of Radiology and Nuclear Medicine, Erasmus Medical Centre, Rotterdam, the Netherlands
| | - G Kotek
- Department of Radiology and Nuclear Medicine, Erasmus Medical Centre, Rotterdam, the Netherlands
| | - M Vogel
- General Electric Healthcare, Waukesha, WI, USA
| | - H A W M Tiddens
- Department of Radiology and Nuclear Medicine, Erasmus Medical Centre, Rotterdam, the Netherlands; Department of Paediatric Pulmonology and Allergology, Erasmus Medical Centre-Sophia Children's Hospital, Rotterdam, the Netherlands
| | - P Ciet
- Department of Radiology and Nuclear Medicine, Erasmus Medical Centre, Rotterdam, the Netherlands; Department of Paediatric Pulmonology and Allergology, Erasmus Medical Centre-Sophia Children's Hospital, Rotterdam, the Netherlands
| | - J A Hernandez-Tamames
- Department of Radiology and Nuclear Medicine, Erasmus Medical Centre, Rotterdam, the Netherlands
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2
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Papp D, Breda S, Oei E, Poot D, Kotek G, Hernandez-Tamames J. Fractional order vs. exponential fitting in UTE MR imaging of the patellar tendon. Magn Reson Imaging 2020; 70:91-97. [DOI: 10.1016/j.mri.2020.04.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2019] [Revised: 03/09/2020] [Accepted: 04/11/2020] [Indexed: 01/18/2023]
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3
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Warnert EAH, Steketee RME, Vernooij MW, Ikram MA, Vogel M, Hernandez Tamames JA, Kotek G. Implementation and validation of ASL perfusion measurements for population imaging. Magn Reson Med 2020; 84:2048-2054. [PMID: 32239745 PMCID: PMC7383568 DOI: 10.1002/mrm.28271] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [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: 02/03/2020] [Revised: 03/10/2020] [Accepted: 03/11/2020] [Indexed: 01/10/2023]
Abstract
Purpose Pseudocontinuous arterial spin labeling (pCASL) allows for noninvasive measurement of regional cerebral blood flow (CBF), which has the potential to serve as biomarker for neurodegenerative and cardiovascular diseases. This work aimed to implement and validate pCASL on the dedicated MRI system within the population‐based Rotterdam Study, which was installed in 2005 and for which software and hardware configurations have remained fixed. Methods Imaging was performed on two 1.5T MRI systems (General Electric); (I) the Rotterdam Study system, and (II) a hospital‐based system with a product pCASL sequence. An in‐house implementation of pCASL was created on scanner I. A flow phantom and three healthy volunteers (<27 years) were scanned on both systems for validation purposes. The data of the first 30 participants (86 ± 4 years) of the Rotterdam Study undergoing pCASL scans on scanner I only were analyzed with and without partial volume correction for gray matter. Results The validation study showed a difference in blood flow velocity, sensitivity, and spatial coefficient of variation of the perfusion‐weighted signal between the two scanners, which was accounted for during post‐processing. Gray matter CBF for the Rotterdam Study participants was 52.4 ± 8.2 ml/100 g/min, uncorrected for partial volume effects of gray matter. In this elderly cohort, partial volume correction for gray matter had a variable effect on measured CBF in a range of cortical and sub‐cortical regions of interest. Conclusion Regional CBF measurements are now included to investigate novel biomarkers in the Rotterdam Study. This work highlights that when it is not feasible to purchase a novel ASL sequence, an in‐house implementation is valuable.
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Affiliation(s)
- Esther A H Warnert
- Department of Radiology and Nuclear Medicine, Erasmus MC, Rotterdam, the Netherlands
| | - Rebecca M E Steketee
- Department of Radiology and Nuclear Medicine, Erasmus MC, Rotterdam, the Netherlands
| | - Meike W Vernooij
- Department of Radiology and Nuclear Medicine, Erasmus MC, Rotterdam, the Netherlands.,Department of Epidemiology, Erasmus MC, Rotterdam, the Netherlands
| | - M Arfan Ikram
- Department of Epidemiology, Erasmus MC, Rotterdam, the Netherlands
| | | | | | - Gyula Kotek
- Department of Radiology and Nuclear Medicine, Erasmus MC, Rotterdam, the Netherlands
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de Vries BA, van der Heijden RA, Verschueren J, Bos PK, Poot DH, van Tiel J, Kotek G, Krestin GP, Oei EH. Quantitative subchondral bone perfusion imaging in knee osteoarthritis using dynamic contrast enhanced MRI. Semin Arthritis Rheum 2020; 50:177-182. [DOI: 10.1016/j.semarthrit.2019.07.013] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2019] [Revised: 07/30/2019] [Accepted: 07/31/2019] [Indexed: 01/12/2023]
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Breda SJ, Poot DHJ, Papp D, de Vries BA, Kotek G, Krestin GP, Hernández-Tamames JA, de Vos RJ, Oei EHG. Tissue-Specific T 2 * Biomarkers in Patellar Tendinopathy by Subregional Quantification Using 3D Ultrashort Echo Time MRI. J Magn Reson Imaging 2020; 52:420-430. [PMID: 32108398 PMCID: PMC7496783 DOI: 10.1002/jmri.27108] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [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: 01/10/2020] [Revised: 02/13/2020] [Accepted: 02/13/2020] [Indexed: 12/21/2022] Open
Abstract
Background Quantitative MRI of patellar tendinopathy (PT) can be challenging due to spatial variation of T2* relaxation times. Purpose 1) To compare T2* quantification using a standard approach with analysis in specific tissue compartments of the patellar tendon. 2) To evaluate test–retest reliability of different methods for fitting ultrashort echo time (UTE)‐relaxometry data. Study Type Prospective. Subjects Sixty‐five athletes with PT. Field Strength/Sequence 3D UTE scans covering the patellar tendon were acquired using a 3.0T scanner and a 16‐channel surface coil. Assessment Voxelwise median T2* was quantified with monoexponential, fractional‐order, and biexponential fitting. We applied two methods for T2* analysis: first, a standard approach by analyzing all voxels covering the proximal patellar tendon. Second, within subregions of the patellar tendon, by using thresholds on biexponential fitting parameter percentage short T2* (0–30% for mostly long T2*, 30–60% for mixed T2*, and 60–100% for mostly short T2*). Statistical Tests Average test–retest reliability was assessed in three athletes using coefficients‐of‐variation (CV) and coefficients‐of‐repeatability (CR). Results With standard image analysis, we found a median [interquartile range, IQR] monoexponential T2* of 6.43 msec [4.32–8.55] and fractional order T2* 4.39 msec [3.06–5.78]. The percentage of short T2* components was 52.9% [35.5–69.6]. Subregional monoexponential T2* was 13.78 msec [12.11–16.46], 7.65 msec [6.49–8.61], and 3.05 msec [2.52–3.60] and fractional order T2* 11.82 msec [10.09–14.44], 5.14 msec [4.25–5.96], and 2.19 msec [1.82–2.64] for 0–30%, 30–60%, and 60–100% short T2*, respectively. Biexponential component short T2* was 1.693 msec [1.417–2.003] for tissue with mostly short T2* and long T2* of 15.79 msec [13.47–18.61] for mostly long T2*. The average CR (CV) was 2 msec (15%), 2 msec (19%) and 10% (22%) for monoexponential, fractional order and percentage short T2*, respectively. Data Conclusion Patellar tendinopathy is characterized by regional variability in binding states of water. Quantitative multicompartment T2* analysis in PT can be facilitated using a voxel selection method based on using biexponential fitting parameters. Level of Evidence 1 Technical Efficacy Stage 1 J. Magn. Reson. Imaging 2020;52:420–430.
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Affiliation(s)
- Stephan J Breda
- Department of Radiology & Nuclear Medicine, Erasmus MC University Medical Center Rotterdam, Rotterdam, The Netherlands.,Department of Orthopedics and Sports Medicine, Erasmus MC University Medical Center Rotterdam, Rotterdam, The Netherlands
| | - Dirk H J Poot
- Department of Radiology & Nuclear Medicine, Erasmus MC University Medical Center Rotterdam, Rotterdam, The Netherlands
| | - Dorottya Papp
- Department of Radiology & Nuclear Medicine, Erasmus MC University Medical Center Rotterdam, Rotterdam, The Netherlands
| | - Bas A de Vries
- Department of Radiology & Nuclear Medicine, Erasmus MC University Medical Center Rotterdam, Rotterdam, The Netherlands
| | - Gyula Kotek
- Department of Radiology & Nuclear Medicine, Erasmus MC University Medical Center Rotterdam, Rotterdam, The Netherlands
| | - Gabriel P Krestin
- Department of Radiology & Nuclear Medicine, Erasmus MC University Medical Center Rotterdam, Rotterdam, The Netherlands
| | - Juan A Hernández-Tamames
- Department of Radiology & Nuclear Medicine, Erasmus MC University Medical Center Rotterdam, Rotterdam, The Netherlands
| | - Robert-Jan de Vos
- Department of Orthopedics and Sports Medicine, Erasmus MC University Medical Center Rotterdam, Rotterdam, The Netherlands
| | - Edwin H G Oei
- Department of Radiology & Nuclear Medicine, Erasmus MC University Medical Center Rotterdam, Rotterdam, The Netherlands
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van der Heijden RA, Poot DHJ, Ekinci M, Kotek G, van Veldhoven PLJ, Klein S, Verhaar JAN, Krestin GP, Bierma-Zeinstra SMA, van Middelkoop M, Oei EHG. Blood perfusion of patellar bone measured by dynamic contrast-enhanced MRI in patients with patellofemoral pain: A case-control study. J Magn Reson Imaging 2018; 48:1344-1350. [PMID: 29734499 PMCID: PMC6221059 DOI: 10.1002/jmri.26174] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [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: 02/02/2018] [Accepted: 04/16/2018] [Indexed: 01/04/2023] Open
Abstract
BACKGROUND Altered perfusion might play an important role in the pathophysiology of patellofemoral pain (PFP), a common knee complaint with unclear pathophysiology. PURPOSE To investigate differences in dynamic contrast-enhanced (DCE)-MRI perfusion parameters between patients with PFP and healthy control subjects. POPULATION/SUBJECTS/PHANTOM/SPECIMEN/ANIMAL MODEL Thirty-five adult patients with PFP and 44 healthy adult control subjects. FIELD STRENGTH/SEQUENCE 3T DCE-MRI consisting of a sagittal, anterior-posterior, frequency-encoded, fat-suppressed 3D spoiled gradient-echo sequence with intravenous contrast administration. ASSESSMENT Patellar bone volumes of interest (VOIs) were delineated by a blinded observer. Quantitative perfusion parameters (kep and ktrans ) were calculated from motion-compensated DCE-MRI data by fitting Tofts' model. Weighted mean and unweighted median values of kep and ktrans were computed within the patellar bone VOIs. STATISTICAL TESTS Differences in patellar bone perfusion parameters were compared between groups by linear regression analyses, adjusted for confounders. RESULTS Mean differences of weighted mean and unweighted median were 0.0039 (95% confidence interval [CI] -0.0013; 0.0091) and 0.0052 (95% CI -0.0078; 0.018) for ktrans , and 0.046 (95% CI -0.021; 0.11) and 0.069 (95% CI -0.017; 0.15) for kep , respectively. All perfusion parameters were not significantly different between groups (P-values: 0.32; 0.47 for ktrans , and 0.24; 0.15) for kep . However, a significant difference in variance between populations was observed for ktrans (P-value 0.007). DATA CONCLUSION Higher patellar bone perfusion parameters were found in patients with PFP when compared to healthy control subjects, but these differences were not statistically significant. This result, and the observed significant difference in ktrans variance, warrant further research. LEVEL OF EVIDENCE 1 Technical Efficacy: Stage 3 J. Magn. Reson. Imaging 2018;47:1344-1350.
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Affiliation(s)
- Rianne A van der Heijden
- Department of General Practice, Erasmus MC, University Medical Center, Rotterdam, The Netherlands.,Department of Radiology & Nuclear Medicine, Erasmus MC, University Medical Center, Rotterdam, The Netherlands
| | - Dirk H J Poot
- Biomedical Imaging Group Rotterdam, Departments of Medical Informatics & Radiology, Erasmus MC, Rotterdam, The Netherlands.,Quantitative Imaging, Department of Imaging Physics, TU Delft, Delft, The Netherlands
| | - Melek Ekinci
- Department of General Practice, Erasmus MC, University Medical Center, Rotterdam, The Netherlands
| | - Gyula Kotek
- Department of Radiology & Nuclear Medicine, Erasmus MC, University Medical Center, Rotterdam, The Netherlands
| | | | - Stefan Klein
- Biomedical Imaging Group Rotterdam, Departments of Medical Informatics & Radiology, Erasmus MC, Rotterdam, The Netherlands
| | - Jan A N Verhaar
- Department of Orthopedics Erasmus MC, University Medical Center, Rotterdam, The Netherlands
| | - Gabriel P Krestin
- Department of Radiology & Nuclear Medicine, Erasmus MC, University Medical Center, Rotterdam, The Netherlands
| | - Sita M A Bierma-Zeinstra
- Department of General Practice, Erasmus MC, University Medical Center, Rotterdam, The Netherlands.,Department of Orthopedics Erasmus MC, University Medical Center, Rotterdam, The Netherlands
| | - Marienke van Middelkoop
- Department of General Practice, Erasmus MC, University Medical Center, Rotterdam, The Netherlands
| | - Edwin H G Oei
- Department of Radiology & Nuclear Medicine, Erasmus MC, University Medical Center, Rotterdam, The Netherlands
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7
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Coolen BF, Poot DH, Liem MI, Smits LP, Gao S, Kotek G, Klein S, Nederveen AJ. Three‐dimensional quantitative T
1
and T
2
mapping of the carotid artery: Sequence design and in vivo feasibility. Magn Reson Med 2016; 75:1008-17. [DOI: 10.1002/mrm.25634] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2014] [Revised: 12/17/2014] [Accepted: 01/05/2015] [Indexed: 12/12/2022]
Affiliation(s)
- Bram F. Coolen
- Department of RadiologyAcademic Medical CenterAmsterdam the Netherlands
| | - Dirk H.J. Poot
- Biomedical Imaging Group Rotterdam, Depts. of Radiology and Medical InformaticsErasmus Medical CenterRotterdam the Netherlands
- Quantitative Imaging Group, Department of Imaging PhysicsDelft University of TechnologyDelft The Netherlands
| | - Madieke I. Liem
- Department of NeurologyAcademic Medical CenterAmsterdam the Netherlands
| | - Loek P. Smits
- Department of Vascular MedicineAcademic Medical CenterAmsterdam the Netherlands
| | - Shan Gao
- Department of Radiology, Division of Image ProcessingLeiden University Medical CenterLeiden The Netherlands
| | - Gyula Kotek
- Department of RadiologyErasmus Medical CenterRotterdam the Netherlands
| | - Stefan Klein
- Biomedical Imaging Group Rotterdam, Depts. of Radiology and Medical InformaticsErasmus Medical CenterRotterdam the Netherlands
| | - Aart J. Nederveen
- Department of RadiologyAcademic Medical CenterAmsterdam the Netherlands
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8
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van Tiel J, Kotek G, Reijman M, Bos PK, Bron EE, Klein S, Nasserinejad K, van Osch GJVM, Verhaar JAN, Krestin GP, Weinans H, Oei EHG. Is T1ρ Mapping an Alternative to Delayed Gadolinium-enhanced MR Imaging of Cartilage in the Assessment of Sulphated Glycosaminoglycan Content in Human Osteoarthritic Knees? An in Vivo Validation Study. Radiology 2015; 279:523-31. [PMID: 26588020 DOI: 10.1148/radiol.2015150693] [Citation(s) in RCA: 57] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
PURPOSE To determine if T1ρ mapping can be used as an alternative to delayed gadolinium-enhanced magnetic resonance imaging of cartilage (dGEMRIC) in the quantification of cartilage biochemical composition in vivo in human knees with osteoarthritis. MATERIALS AND METHODS This study was approved by the institutional review board. Written informed consent was obtained from all participants. Twelve patients with knee osteoarthritis underwent dGEMRIC and T1ρ mapping at 3.0 T before undergoing total knee replacement. Outcomes of dGEMRIC and T1ρ mapping were calculated in six cartilage regions of interest. Femoral and tibial cartilages were harvested during total knee replacement. Cartilage sulphated glycosaminoglycan (sGAG) and collagen content were assessed with dimethylmethylene blue and hydroxyproline assays, respectively. A four-dimensional multivariate mixed-effects model was used to simultaneously assess the correlation between outcomes of dGEMRIC and T1ρ mapping and the sGAG and collagen content of the articular cartilage. RESULTS T1 relaxation times at dGEMRIC showed strong correlation with cartilage sGAG content (r = 0.73; 95% credibility interval [CI] = 0.60, 0.83) and weak correlation with cartilage collagen content (r = 0.40; 95% CI: 0.18, 0.58). T1ρ relaxation times did not correlate with cartilage sGAG content (r = 0.04; 95% CI: -0.21, 0.28) or collagen content (r = -0.05; 95% CI = -0.31, 0.20). CONCLUSION dGEMRIC can help accurately measure cartilage sGAG content in vivo in patients with knee osteoarthritis, whereas T1ρ mapping does not appear suitable for this purpose. Although the technique is not completely sGAG specific and requires a contrast agent, dGEMRIC is a validated and robust method for quantifying cartilage sGAG content in human osteoarthritis subjects in clinical research.
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Affiliation(s)
- Jasper van Tiel
- From the Departments of Radiology (J.v.T., G.K., E.E.B., S.K., G.P.K., E.H.G.O.), Orthopedic Surgery (J.v.T., M.R., P.K.B., G.J.V.M.v.O., J.A.N.V.), Medical Informatics (E.E.B., S.K.), Biostatistics (K.N.), and Otorhinolaryngology (G.J.V.M.v.O.), Erasmus University Medical Center, PO Box 2040, 3000 CA Rotterdam, the Netherlands; Department of Biomechanical Engineering, Delft University of Technology, Delft, the Netherlands (H.W.); and Department of Orthopedics and Rheumatology, University Medical Center Utrecht, Utrecht, the Netherlands (H.W.)
| | - Gyula Kotek
- From the Departments of Radiology (J.v.T., G.K., E.E.B., S.K., G.P.K., E.H.G.O.), Orthopedic Surgery (J.v.T., M.R., P.K.B., G.J.V.M.v.O., J.A.N.V.), Medical Informatics (E.E.B., S.K.), Biostatistics (K.N.), and Otorhinolaryngology (G.J.V.M.v.O.), Erasmus University Medical Center, PO Box 2040, 3000 CA Rotterdam, the Netherlands; Department of Biomechanical Engineering, Delft University of Technology, Delft, the Netherlands (H.W.); and Department of Orthopedics and Rheumatology, University Medical Center Utrecht, Utrecht, the Netherlands (H.W.)
| | - Max Reijman
- From the Departments of Radiology (J.v.T., G.K., E.E.B., S.K., G.P.K., E.H.G.O.), Orthopedic Surgery (J.v.T., M.R., P.K.B., G.J.V.M.v.O., J.A.N.V.), Medical Informatics (E.E.B., S.K.), Biostatistics (K.N.), and Otorhinolaryngology (G.J.V.M.v.O.), Erasmus University Medical Center, PO Box 2040, 3000 CA Rotterdam, the Netherlands; Department of Biomechanical Engineering, Delft University of Technology, Delft, the Netherlands (H.W.); and Department of Orthopedics and Rheumatology, University Medical Center Utrecht, Utrecht, the Netherlands (H.W.)
| | - Pieter K Bos
- From the Departments of Radiology (J.v.T., G.K., E.E.B., S.K., G.P.K., E.H.G.O.), Orthopedic Surgery (J.v.T., M.R., P.K.B., G.J.V.M.v.O., J.A.N.V.), Medical Informatics (E.E.B., S.K.), Biostatistics (K.N.), and Otorhinolaryngology (G.J.V.M.v.O.), Erasmus University Medical Center, PO Box 2040, 3000 CA Rotterdam, the Netherlands; Department of Biomechanical Engineering, Delft University of Technology, Delft, the Netherlands (H.W.); and Department of Orthopedics and Rheumatology, University Medical Center Utrecht, Utrecht, the Netherlands (H.W.)
| | - Esther E Bron
- From the Departments of Radiology (J.v.T., G.K., E.E.B., S.K., G.P.K., E.H.G.O.), Orthopedic Surgery (J.v.T., M.R., P.K.B., G.J.V.M.v.O., J.A.N.V.), Medical Informatics (E.E.B., S.K.), Biostatistics (K.N.), and Otorhinolaryngology (G.J.V.M.v.O.), Erasmus University Medical Center, PO Box 2040, 3000 CA Rotterdam, the Netherlands; Department of Biomechanical Engineering, Delft University of Technology, Delft, the Netherlands (H.W.); and Department of Orthopedics and Rheumatology, University Medical Center Utrecht, Utrecht, the Netherlands (H.W.)
| | - Stefan Klein
- From the Departments of Radiology (J.v.T., G.K., E.E.B., S.K., G.P.K., E.H.G.O.), Orthopedic Surgery (J.v.T., M.R., P.K.B., G.J.V.M.v.O., J.A.N.V.), Medical Informatics (E.E.B., S.K.), Biostatistics (K.N.), and Otorhinolaryngology (G.J.V.M.v.O.), Erasmus University Medical Center, PO Box 2040, 3000 CA Rotterdam, the Netherlands; Department of Biomechanical Engineering, Delft University of Technology, Delft, the Netherlands (H.W.); and Department of Orthopedics and Rheumatology, University Medical Center Utrecht, Utrecht, the Netherlands (H.W.)
| | - Kazem Nasserinejad
- From the Departments of Radiology (J.v.T., G.K., E.E.B., S.K., G.P.K., E.H.G.O.), Orthopedic Surgery (J.v.T., M.R., P.K.B., G.J.V.M.v.O., J.A.N.V.), Medical Informatics (E.E.B., S.K.), Biostatistics (K.N.), and Otorhinolaryngology (G.J.V.M.v.O.), Erasmus University Medical Center, PO Box 2040, 3000 CA Rotterdam, the Netherlands; Department of Biomechanical Engineering, Delft University of Technology, Delft, the Netherlands (H.W.); and Department of Orthopedics and Rheumatology, University Medical Center Utrecht, Utrecht, the Netherlands (H.W.)
| | - Gerjo J V M van Osch
- From the Departments of Radiology (J.v.T., G.K., E.E.B., S.K., G.P.K., E.H.G.O.), Orthopedic Surgery (J.v.T., M.R., P.K.B., G.J.V.M.v.O., J.A.N.V.), Medical Informatics (E.E.B., S.K.), Biostatistics (K.N.), and Otorhinolaryngology (G.J.V.M.v.O.), Erasmus University Medical Center, PO Box 2040, 3000 CA Rotterdam, the Netherlands; Department of Biomechanical Engineering, Delft University of Technology, Delft, the Netherlands (H.W.); and Department of Orthopedics and Rheumatology, University Medical Center Utrecht, Utrecht, the Netherlands (H.W.)
| | - Jan A N Verhaar
- From the Departments of Radiology (J.v.T., G.K., E.E.B., S.K., G.P.K., E.H.G.O.), Orthopedic Surgery (J.v.T., M.R., P.K.B., G.J.V.M.v.O., J.A.N.V.), Medical Informatics (E.E.B., S.K.), Biostatistics (K.N.), and Otorhinolaryngology (G.J.V.M.v.O.), Erasmus University Medical Center, PO Box 2040, 3000 CA Rotterdam, the Netherlands; Department of Biomechanical Engineering, Delft University of Technology, Delft, the Netherlands (H.W.); and Department of Orthopedics and Rheumatology, University Medical Center Utrecht, Utrecht, the Netherlands (H.W.)
| | - Gabriel P Krestin
- From the Departments of Radiology (J.v.T., G.K., E.E.B., S.K., G.P.K., E.H.G.O.), Orthopedic Surgery (J.v.T., M.R., P.K.B., G.J.V.M.v.O., J.A.N.V.), Medical Informatics (E.E.B., S.K.), Biostatistics (K.N.), and Otorhinolaryngology (G.J.V.M.v.O.), Erasmus University Medical Center, PO Box 2040, 3000 CA Rotterdam, the Netherlands; Department of Biomechanical Engineering, Delft University of Technology, Delft, the Netherlands (H.W.); and Department of Orthopedics and Rheumatology, University Medical Center Utrecht, Utrecht, the Netherlands (H.W.)
| | - Harrie Weinans
- From the Departments of Radiology (J.v.T., G.K., E.E.B., S.K., G.P.K., E.H.G.O.), Orthopedic Surgery (J.v.T., M.R., P.K.B., G.J.V.M.v.O., J.A.N.V.), Medical Informatics (E.E.B., S.K.), Biostatistics (K.N.), and Otorhinolaryngology (G.J.V.M.v.O.), Erasmus University Medical Center, PO Box 2040, 3000 CA Rotterdam, the Netherlands; Department of Biomechanical Engineering, Delft University of Technology, Delft, the Netherlands (H.W.); and Department of Orthopedics and Rheumatology, University Medical Center Utrecht, Utrecht, the Netherlands (H.W.)
| | - Edwin H G Oei
- From the Departments of Radiology (J.v.T., G.K., E.E.B., S.K., G.P.K., E.H.G.O.), Orthopedic Surgery (J.v.T., M.R., P.K.B., G.J.V.M.v.O., J.A.N.V.), Medical Informatics (E.E.B., S.K.), Biostatistics (K.N.), and Otorhinolaryngology (G.J.V.M.v.O.), Erasmus University Medical Center, PO Box 2040, 3000 CA Rotterdam, the Netherlands; Department of Biomechanical Engineering, Delft University of Technology, Delft, the Netherlands (H.W.); and Department of Orthopedics and Rheumatology, University Medical Center Utrecht, Utrecht, the Netherlands (H.W.)
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9
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Duinhouwer LE, van Rossum BJM, van Tiel ST, van der Werf RM, Doeswijk GN, Haeck JC, Rombouts EWJC, ter Borg MND, Kotek G, Braakman E, Cornelissen JJ, Bernsen MR. Magnetic Resonance Detection of CD34+ Cells from Umbilical Cord Blood Using a 19F Label. PLoS One 2015; 10:e0138572. [PMID: 26394043 PMCID: PMC4578896 DOI: 10.1371/journal.pone.0138572] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2015] [Accepted: 09/01/2015] [Indexed: 12/20/2022] Open
Abstract
Impaired homing and delayed recovery upon hematopoietic stem cell transplantation (HSCT) with hematopoietic stem cells (HSC) derived from umbilical cord blood (UCB) is a major problem. Tracking transplanted cells in vivo will be helpful to detect impaired homing at an early stage and allows early interventions to improve engraftment and outcome after transplantation. In this study, we show sufficient intracellular labeling of UCB-derived CD34+ cells, with 19F-containing PLGA nanoparticles which were detectable with both flow cytometry and magnetic resonance spectroscopy (MRS). In addition, labeled CD34+ cells maintain their capacity to proliferate and differentiate, which is pivotal for successful engraftment after transplantation in vivo. These results set the stage for in vivo tracking experiments, through which the homing efficiency of transplanted cells can be studied.
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Affiliation(s)
- Lucia E. Duinhouwer
- Department of Hematology, Erasmus University Medical Centre, Rotterdam, The Netherlands
- * E-mail:
| | | | - Sandra T. van Tiel
- Department of Radiology, Erasmus University Medical Centre, Rotterdam, The Netherlands
| | - Ramon M. van der Werf
- Department of Radiology, Erasmus University Medical Centre, Rotterdam, The Netherlands
| | - Gabriela N. Doeswijk
- Department of Radiology, Erasmus University Medical Centre, Rotterdam, The Netherlands
| | - Joost C. Haeck
- Department of Radiology, Erasmus University Medical Centre, Rotterdam, The Netherlands
| | | | | | - Gyula Kotek
- Department of Radiology, Erasmus University Medical Centre, Rotterdam, The Netherlands
| | - Eric Braakman
- Department of Hematology, Erasmus University Medical Centre, Rotterdam, The Netherlands
| | - Jan J. Cornelissen
- Department of Hematology, Erasmus University Medical Centre, Rotterdam, The Netherlands
| | - Monique R. Bernsen
- Department of Radiology, Erasmus University Medical Centre, Rotterdam, The Netherlands
- Department of Nuclear Medicine, Erasmus University Medical Centre, Rotterdam, The Netherlands
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10
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Tarasek MR, Pellicer R, Hofstetter LW, Numan WCM, Bakker JF, Kotek G, Togni P, Verhaart RF, Fiveland EW, Houston GC, van Rhoon GC, Paulides MM, Yeo DTB. Validation of MR thermometry: method for temperature probe sensor registration accuracy in head and neck phantoms. Int J Hyperthermia 2015; 30:142-9. [PMID: 24571177 DOI: 10.3109/02656736.2014.887794] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
PURPOSE Magnetic resonance thermometry (MRT) is an attractive means to non-invasively monitor in vivo temperature during head and neck hyperthermia treatments because it can provide multi-dimensional temperature information with high spatial resolution over large regions of interest. However, validation of MRT measurements in a head and neck clinical set-up is crucial to ensure the temperature maps are accurate. Here we demonstrate a unique approach for temperature probe sensor localisation in head and neck hyperthermia test phantoms. METHODS We characterise the proton resonance frequency shift temperature coefficient and validate MRT measurements in an oil-gel phantom by applying a combination of MR imaging and 3D spline fitting for accurate probe localisation. We also investigate how uncertainties in both the probe localisation and the proton resonance frequency shift (PRFS) thermal coefficient affect the registration of fibre-optic reference temperature probe and MRT readings. RESULTS The method provides a two-fold advantage of sensor localisation and PRFS thermal coefficient calibration. We provide experimental data for two distinct head and neck phantoms showing the significance of this method as it mitigates temperature probe localisation errors and thereby increases accuracy of MRT validation results. CONCLUSIONS The techniques presented here may be used to simplify calibration experiments that use an interstitial heating device, or any heating method that provides rapid and spatially localised heat distributions. Overall, the experimental verification of the data registration and PRFS thermal coefficient calibration technique provides a useful benchmarking method to maximise MRT accuracy in any similar context.
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Affiliation(s)
- Matthew R Tarasek
- GE Global Research, Diagnostics and Biomedical Technologies, One Research Circle , Niskayuna, New York , USA
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11
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Ruggiero A, Guenoun J, Smit H, Doeswijk GN, Klein S, Krestin GP, Kotek G, Bernsen MR. In vivo MRI mapping of iron oxide-labeled stem cells transplanted in the heart. Contrast Media Mol Imaging 2014; 8:487-94. [PMID: 24375904 DOI: 10.1002/cmmi.1582] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2013] [Revised: 09/20/2013] [Accepted: 10/26/2013] [Indexed: 12/19/2022]
Abstract
In various stem cell therapy approaches poor cell survival has been recognized as an important factor limiting therapeutic efficacy. Therefore noninvasive monitoring of cell fate is warranted for developing clinically effective stem cell therapy. In this study we investigated the use of voxel-based R₂ mapping as a tool to monitor the fate of iron oxide-labeled cells in the myocardium. Mesenchymal stem cells were transduced with the luciferase gene, labeled with ferumoxide particles and injected in the myocardium of healthy rats. Cell fate was monitored over a period of 8 weeks by bioluminescence and quantitative magnetic resonance imaging. Bioluminescence signal increased during the first week followed by a steep decrease to undetectable levels during the second week. MR imaging showed a sharp increase in R₂ values shortly after injection at the injection site, followed by a very gradual decrease of R₂ over a period of 8 weeks. No difference in the appearances on R₂-weighted images was observed between living and dead cells over the entire time period studied. No significant correlation between the bioluminescence optical data and R₂ values was observed and quantitative R₂ mapping appeared not suitable for the in vivo assessment of stem cell. These results do not follow previous in vitro reports where it was proposed that living cells may be distinguished from dead cells on the basis of the R₂ relaxivities (intracellular and extracellular iron oxides). Cell proliferation, cell migration, cell death, extracellular superparamagnetic iron oxide dispersion and aggregation exhibit different relaxivities. In vivo these processes happen simultaneously, making quantification very complex, if not impossible.
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Affiliation(s)
- A Ruggiero
- Department of Radiology, Erasmus MC, Rotterdam, The Netherlands
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12
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Okamura H, Pisani LJ, Dalal AR, Emrich F, Dake BA, Arakawa M, Onthank DC, Cesati RR, Robinson SP, Milanesi M, Kotek G, Smit H, Connolly AJ, Adachi H, McConnell MV, Fischbein MP. Assessment of elastin deficit in a Marfan mouse aneurysm model using an elastin-specific magnetic resonance imaging contrast agent. Circ Cardiovasc Imaging 2014; 7:690-6. [PMID: 24814820 DOI: 10.1161/circimaging.114.001658] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [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] [Indexed: 11/16/2022]
Abstract
BACKGROUND Ascending aortic dissection and rupture remain a life-threatening complication in patients with Marfan syndrome. The extracellular matrix provides strength and elastic recoil to the aortic wall, thereby preventing radial expansion. We have previously shown that ascending aortic aneurysm formation in Marfan mice (Fbn1(C1039G/+)) is associated with decreased aortic wall elastogenesis and increased elastin breakdown. In this study, we test the feasibility of quantifying aortic wall elastin content using MRI with a gadolinium-based elastin-specific magnetic resonance contrast agent in Fbn1(C1039G/+) mice. METHODS AND RESULTS Ascending aorta elastin content was measured in 32-week-old Fbn1(C1039G/+) mice and wild-type (n=9 and n=10, respectively) using 7-T MRI with a T1 mapping sequence. Significantly lower enhancement (ie, lower R1 values, where R1=1/T1) was detected post-elastin-specific magnetic resonance contrast agent in Fbn1(C1039G/+) compared with wild-type ascending aortas (1.15±0.07 versus 1.36±0.05; P<0.05). Post-elastin-specific magnetic resonance contrast agent R1 values correlated with ascending aortic wall gadolinium content directly measured by inductively coupled mass spectroscopy (P=0.006). CONCLUSIONS Herein, we demonstrate that MRI with elastin-specific magnetic resonance contrast agent accurately measures elastin bound gadolinium within the aortic wall and detects a decrease in aortic wall elastin in Marfan mice compared with wild-type controls. This approach has translational potential for noninvasively assessing aneurysm tissue changes and risk, as well as monitoring elastin content in response to therapeutic interventions.
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Affiliation(s)
- Homare Okamura
- From the Departments of Cardiothoracic Surgery (H.O., A.R.D., F.E., B.A.D., M.A., M.P.F.), Radiology (L.J.P.), and Pathology (A.J.C.), Stanford University, CA; Department of Cardiovascular Surgery, Jichi Medical University, Saitama Medical Center, Saitama, Japan (H.O., M.A., H.A.); Lantheus Medical Imaging, North Billerica, MA (D.C.O., R.R.C., S.P.R.); Agilent Technologies, Yarnton, Oxford, United Kingdom (M.M.); Departments of Radiology (G.K.) and Medical Informatics and Radiology (H.S.), Erasmus MC, Rotterdam, The Netherlands; and Division of Cardiovascular Medicine, Stanford University, CA (M.V.M.)
| | - Laura J Pisani
- From the Departments of Cardiothoracic Surgery (H.O., A.R.D., F.E., B.A.D., M.A., M.P.F.), Radiology (L.J.P.), and Pathology (A.J.C.), Stanford University, CA; Department of Cardiovascular Surgery, Jichi Medical University, Saitama Medical Center, Saitama, Japan (H.O., M.A., H.A.); Lantheus Medical Imaging, North Billerica, MA (D.C.O., R.R.C., S.P.R.); Agilent Technologies, Yarnton, Oxford, United Kingdom (M.M.); Departments of Radiology (G.K.) and Medical Informatics and Radiology (H.S.), Erasmus MC, Rotterdam, The Netherlands; and Division of Cardiovascular Medicine, Stanford University, CA (M.V.M.)
| | - Alex R Dalal
- From the Departments of Cardiothoracic Surgery (H.O., A.R.D., F.E., B.A.D., M.A., M.P.F.), Radiology (L.J.P.), and Pathology (A.J.C.), Stanford University, CA; Department of Cardiovascular Surgery, Jichi Medical University, Saitama Medical Center, Saitama, Japan (H.O., M.A., H.A.); Lantheus Medical Imaging, North Billerica, MA (D.C.O., R.R.C., S.P.R.); Agilent Technologies, Yarnton, Oxford, United Kingdom (M.M.); Departments of Radiology (G.K.) and Medical Informatics and Radiology (H.S.), Erasmus MC, Rotterdam, The Netherlands; and Division of Cardiovascular Medicine, Stanford University, CA (M.V.M.)
| | - Fabian Emrich
- From the Departments of Cardiothoracic Surgery (H.O., A.R.D., F.E., B.A.D., M.A., M.P.F.), Radiology (L.J.P.), and Pathology (A.J.C.), Stanford University, CA; Department of Cardiovascular Surgery, Jichi Medical University, Saitama Medical Center, Saitama, Japan (H.O., M.A., H.A.); Lantheus Medical Imaging, North Billerica, MA (D.C.O., R.R.C., S.P.R.); Agilent Technologies, Yarnton, Oxford, United Kingdom (M.M.); Departments of Radiology (G.K.) and Medical Informatics and Radiology (H.S.), Erasmus MC, Rotterdam, The Netherlands; and Division of Cardiovascular Medicine, Stanford University, CA (M.V.M.)
| | - Benjamin A Dake
- From the Departments of Cardiothoracic Surgery (H.O., A.R.D., F.E., B.A.D., M.A., M.P.F.), Radiology (L.J.P.), and Pathology (A.J.C.), Stanford University, CA; Department of Cardiovascular Surgery, Jichi Medical University, Saitama Medical Center, Saitama, Japan (H.O., M.A., H.A.); Lantheus Medical Imaging, North Billerica, MA (D.C.O., R.R.C., S.P.R.); Agilent Technologies, Yarnton, Oxford, United Kingdom (M.M.); Departments of Radiology (G.K.) and Medical Informatics and Radiology (H.S.), Erasmus MC, Rotterdam, The Netherlands; and Division of Cardiovascular Medicine, Stanford University, CA (M.V.M.)
| | - Mamoru Arakawa
- From the Departments of Cardiothoracic Surgery (H.O., A.R.D., F.E., B.A.D., M.A., M.P.F.), Radiology (L.J.P.), and Pathology (A.J.C.), Stanford University, CA; Department of Cardiovascular Surgery, Jichi Medical University, Saitama Medical Center, Saitama, Japan (H.O., M.A., H.A.); Lantheus Medical Imaging, North Billerica, MA (D.C.O., R.R.C., S.P.R.); Agilent Technologies, Yarnton, Oxford, United Kingdom (M.M.); Departments of Radiology (G.K.) and Medical Informatics and Radiology (H.S.), Erasmus MC, Rotterdam, The Netherlands; and Division of Cardiovascular Medicine, Stanford University, CA (M.V.M.)
| | - David C Onthank
- From the Departments of Cardiothoracic Surgery (H.O., A.R.D., F.E., B.A.D., M.A., M.P.F.), Radiology (L.J.P.), and Pathology (A.J.C.), Stanford University, CA; Department of Cardiovascular Surgery, Jichi Medical University, Saitama Medical Center, Saitama, Japan (H.O., M.A., H.A.); Lantheus Medical Imaging, North Billerica, MA (D.C.O., R.R.C., S.P.R.); Agilent Technologies, Yarnton, Oxford, United Kingdom (M.M.); Departments of Radiology (G.K.) and Medical Informatics and Radiology (H.S.), Erasmus MC, Rotterdam, The Netherlands; and Division of Cardiovascular Medicine, Stanford University, CA (M.V.M.)
| | - Richard R Cesati
- From the Departments of Cardiothoracic Surgery (H.O., A.R.D., F.E., B.A.D., M.A., M.P.F.), Radiology (L.J.P.), and Pathology (A.J.C.), Stanford University, CA; Department of Cardiovascular Surgery, Jichi Medical University, Saitama Medical Center, Saitama, Japan (H.O., M.A., H.A.); Lantheus Medical Imaging, North Billerica, MA (D.C.O., R.R.C., S.P.R.); Agilent Technologies, Yarnton, Oxford, United Kingdom (M.M.); Departments of Radiology (G.K.) and Medical Informatics and Radiology (H.S.), Erasmus MC, Rotterdam, The Netherlands; and Division of Cardiovascular Medicine, Stanford University, CA (M.V.M.)
| | - Simon P Robinson
- From the Departments of Cardiothoracic Surgery (H.O., A.R.D., F.E., B.A.D., M.A., M.P.F.), Radiology (L.J.P.), and Pathology (A.J.C.), Stanford University, CA; Department of Cardiovascular Surgery, Jichi Medical University, Saitama Medical Center, Saitama, Japan (H.O., M.A., H.A.); Lantheus Medical Imaging, North Billerica, MA (D.C.O., R.R.C., S.P.R.); Agilent Technologies, Yarnton, Oxford, United Kingdom (M.M.); Departments of Radiology (G.K.) and Medical Informatics and Radiology (H.S.), Erasmus MC, Rotterdam, The Netherlands; and Division of Cardiovascular Medicine, Stanford University, CA (M.V.M.)
| | - Matteo Milanesi
- From the Departments of Cardiothoracic Surgery (H.O., A.R.D., F.E., B.A.D., M.A., M.P.F.), Radiology (L.J.P.), and Pathology (A.J.C.), Stanford University, CA; Department of Cardiovascular Surgery, Jichi Medical University, Saitama Medical Center, Saitama, Japan (H.O., M.A., H.A.); Lantheus Medical Imaging, North Billerica, MA (D.C.O., R.R.C., S.P.R.); Agilent Technologies, Yarnton, Oxford, United Kingdom (M.M.); Departments of Radiology (G.K.) and Medical Informatics and Radiology (H.S.), Erasmus MC, Rotterdam, The Netherlands; and Division of Cardiovascular Medicine, Stanford University, CA (M.V.M.)
| | - Gyula Kotek
- From the Departments of Cardiothoracic Surgery (H.O., A.R.D., F.E., B.A.D., M.A., M.P.F.), Radiology (L.J.P.), and Pathology (A.J.C.), Stanford University, CA; Department of Cardiovascular Surgery, Jichi Medical University, Saitama Medical Center, Saitama, Japan (H.O., M.A., H.A.); Lantheus Medical Imaging, North Billerica, MA (D.C.O., R.R.C., S.P.R.); Agilent Technologies, Yarnton, Oxford, United Kingdom (M.M.); Departments of Radiology (G.K.) and Medical Informatics and Radiology (H.S.), Erasmus MC, Rotterdam, The Netherlands; and Division of Cardiovascular Medicine, Stanford University, CA (M.V.M.)
| | - Henk Smit
- From the Departments of Cardiothoracic Surgery (H.O., A.R.D., F.E., B.A.D., M.A., M.P.F.), Radiology (L.J.P.), and Pathology (A.J.C.), Stanford University, CA; Department of Cardiovascular Surgery, Jichi Medical University, Saitama Medical Center, Saitama, Japan (H.O., M.A., H.A.); Lantheus Medical Imaging, North Billerica, MA (D.C.O., R.R.C., S.P.R.); Agilent Technologies, Yarnton, Oxford, United Kingdom (M.M.); Departments of Radiology (G.K.) and Medical Informatics and Radiology (H.S.), Erasmus MC, Rotterdam, The Netherlands; and Division of Cardiovascular Medicine, Stanford University, CA (M.V.M.)
| | - Andrew J Connolly
- From the Departments of Cardiothoracic Surgery (H.O., A.R.D., F.E., B.A.D., M.A., M.P.F.), Radiology (L.J.P.), and Pathology (A.J.C.), Stanford University, CA; Department of Cardiovascular Surgery, Jichi Medical University, Saitama Medical Center, Saitama, Japan (H.O., M.A., H.A.); Lantheus Medical Imaging, North Billerica, MA (D.C.O., R.R.C., S.P.R.); Agilent Technologies, Yarnton, Oxford, United Kingdom (M.M.); Departments of Radiology (G.K.) and Medical Informatics and Radiology (H.S.), Erasmus MC, Rotterdam, The Netherlands; and Division of Cardiovascular Medicine, Stanford University, CA (M.V.M.)
| | - Hideo Adachi
- From the Departments of Cardiothoracic Surgery (H.O., A.R.D., F.E., B.A.D., M.A., M.P.F.), Radiology (L.J.P.), and Pathology (A.J.C.), Stanford University, CA; Department of Cardiovascular Surgery, Jichi Medical University, Saitama Medical Center, Saitama, Japan (H.O., M.A., H.A.); Lantheus Medical Imaging, North Billerica, MA (D.C.O., R.R.C., S.P.R.); Agilent Technologies, Yarnton, Oxford, United Kingdom (M.M.); Departments of Radiology (G.K.) and Medical Informatics and Radiology (H.S.), Erasmus MC, Rotterdam, The Netherlands; and Division of Cardiovascular Medicine, Stanford University, CA (M.V.M.)
| | - Michael V McConnell
- From the Departments of Cardiothoracic Surgery (H.O., A.R.D., F.E., B.A.D., M.A., M.P.F.), Radiology (L.J.P.), and Pathology (A.J.C.), Stanford University, CA; Department of Cardiovascular Surgery, Jichi Medical University, Saitama Medical Center, Saitama, Japan (H.O., M.A., H.A.); Lantheus Medical Imaging, North Billerica, MA (D.C.O., R.R.C., S.P.R.); Agilent Technologies, Yarnton, Oxford, United Kingdom (M.M.); Departments of Radiology (G.K.) and Medical Informatics and Radiology (H.S.), Erasmus MC, Rotterdam, The Netherlands; and Division of Cardiovascular Medicine, Stanford University, CA (M.V.M.)
| | - Michael P Fischbein
- From the Departments of Cardiothoracic Surgery (H.O., A.R.D., F.E., B.A.D., M.A., M.P.F.), Radiology (L.J.P.), and Pathology (A.J.C.), Stanford University, CA; Department of Cardiovascular Surgery, Jichi Medical University, Saitama Medical Center, Saitama, Japan (H.O., M.A., H.A.); Lantheus Medical Imaging, North Billerica, MA (D.C.O., R.R.C., S.P.R.); Agilent Technologies, Yarnton, Oxford, United Kingdom (M.M.); Departments of Radiology (G.K.) and Medical Informatics and Radiology (H.S.), Erasmus MC, Rotterdam, The Netherlands; and Division of Cardiovascular Medicine, Stanford University, CA (M.V.M.).
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Numan WC, Hofstetter LW, Kotek G, Bakker JF, Fiveland EW, Houston GC, Kudielka G, Yeo DT, Paulides MM. Exploration of MR-guided head and neck hyperthermia by phantom testing of a modified prototype applicator for use with proton resonance frequency shift thermometry. Int J Hyperthermia 2014; 30:184-91. [DOI: 10.3109/02656736.2014.910615] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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14
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Paulides MM, Bakker JF, Hofstetter LW, Numan WCM, Pellicer R, Fiveland EW, Tarasek M, Houston GC, van Rhoon GC, Yeo DTB, Kotek G. Laboratory prototype for experimental validation of MR-guided radiofrequency head and neck hyperthermia. Phys Med Biol 2014; 59:2139-54. [DOI: 10.1088/0031-9155/59/9/2139] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [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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15
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Verhaart R, Pellicer R, Van der Lugt A, Paulides M, Kotek G. OC-0082: Dynamic-contrast-enhanced MR imaging: a phantom for offline parameter optimization and quality assurance. Radiother Oncol 2014. [DOI: 10.1016/s0167-8140(15)30187-0] [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: 10/23/2022]
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16
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van Tiel J, Reijman M, Bos PK, Hermans J, van Buul GM, Bron EE, Klein S, Verhaar JAN, Krestin GP, Bierma-Zeinstra SMA, Weinans H, Kotek G, Oei EHG. Delayed gadolinium-enhanced MRI of cartilage (dGEMRIC) shows no change in cartilage structural composition after viscosupplementation in patients with early-stage knee osteoarthritis. PLoS One 2013; 8:e79785. [PMID: 24223194 PMCID: PMC3819245 DOI: 10.1371/journal.pone.0079785] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2013] [Accepted: 09/25/2013] [Indexed: 12/11/2022] Open
Abstract
Introduction Viscosupplementation with hyaluronic acid (HA) of osteoarthritic (OA) knee joints has a well-established positive effect on clinical symptoms. This effect, however, is only temporary and the working mechanism of HA injections is not clear. It was suggested that HA might have disease modifying properties because of its beneficial effect on cartilage sulphated glycosaminoglycan (sGAG) content. Delayed gadolinium-enhanced MRI of cartilage (dGEMRIC) is a highly reproducible, non-invasive surrogate measure for sGAG content and hence composition of cartilage. The aim of this study was to assess whether improvement in cartilage structural composition is detected using dGEMRIC 14 weeks after 3 weekly injections with HA in patients with early-stage knee OA. Methods In 20 early-stage knee OA patients (KLG I-II), 3D dGEMRIC at 3T was acquired before and 14 weeks after 3 weekly injections with HA. To evaluate patient symptoms, the knee injury and osteoarthritis outcome score (KOOS) and a numeric rating scale (NRS) for pain were recorded. To evaluate cartilage composition, six cartilage regions in the knee were analyzed on dGEMRIC. Outcomes of dGEMRIC, KOOS and NRS before and after HA were compared using paired t-testing. Since we performed multiple t-tests, we applied a Bonferroni-Holm correction to determine statistical significance for these analyses. Results All KOOS subscales (‘pain’, ‘symptoms’, ‘daily activities’, ‘sports’ and ’quality of life’) and the NRS pain improved significantly 14 weeks after Viscosupplementation with HA. Outcomes of dGEMRIC did not change significantly after HA compared to baseline in any of the cartilage regions analyzed in the knee. Conclusions Our results confirm previous findings reported in the literature, showing persisting improvement in symptomatic outcome measures in early-stage knee OA patients 14 weeks after Viscosupplementation. Outcomes of dGEMRIC, however, did not change after Viscosupplementation, indicating no change in cartilage structural composition as an explanation for the improvement of clinical symptoms.
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Affiliation(s)
- Jasper van Tiel
- Department of Orthopedic Surgery, Erasmus MC, University Medical Center, Rotterdam, The Netherlands
- Department of Radiology, Erasmus MC, University Medical Center, Rotterdam, The Netherlands
| | - Max Reijman
- Department of Orthopedic Surgery, Erasmus MC, University Medical Center, Rotterdam, The Netherlands
| | - Pieter K. Bos
- Department of Orthopedic Surgery, Erasmus MC, University Medical Center, Rotterdam, The Netherlands
| | - Job Hermans
- Department of Orthopedic Surgery, Erasmus MC, University Medical Center, Rotterdam, The Netherlands
| | - Gerben M. van Buul
- Department of Orthopedic Surgery, Erasmus MC, University Medical Center, Rotterdam, The Netherlands
- Department of Radiology, Erasmus MC, University Medical Center, Rotterdam, The Netherlands
| | - Esther E. Bron
- Department of Radiology, Erasmus MC, University Medical Center, Rotterdam, The Netherlands
- Department of Medical Informatics, Erasmus MC, University Medical Center, Rotterdam, The Netherlands
| | - Stefan Klein
- Department of Radiology, Erasmus MC, University Medical Center, Rotterdam, The Netherlands
- Department of Medical Informatics, Erasmus MC, University Medical Center, Rotterdam, The Netherlands
| | - Jan A. N. Verhaar
- Department of Orthopedic Surgery, Erasmus MC, University Medical Center, Rotterdam, The Netherlands
| | - Gabriel P. Krestin
- Department of Radiology, Erasmus MC, University Medical Center, Rotterdam, The Netherlands
| | - Sita M. A. Bierma-Zeinstra
- Department of Orthopedic Surgery, Erasmus MC, University Medical Center, Rotterdam, The Netherlands
- Department of General Practice, Erasmus MC, University Medical Center, Rotterdam, The Netherlands
| | - Harrie Weinans
- Department of Orthopedic Surgery, Erasmus MC, University Medical Center, Rotterdam, The Netherlands
- Department of Biomechanical Engineering, Delft University of Technology, Delft, The Netherlands
| | - Gyula Kotek
- Department of Radiology, Erasmus MC, University Medical Center, Rotterdam, The Netherlands
| | - Edwin H. G. Oei
- Department of Radiology, Erasmus MC, University Medical Center, Rotterdam, The Netherlands
- * E-mail:
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Smit H, Guridi RP, Guenoun J, Poot DHJ, Doeswijk GN, Milanesi M, Bernsen MR, Krestin GP, Klein S, Kotek G. T1 mapping in the rat myocardium at 7 tesla using a modified CINE inversion recovery sequence. J Magn Reson Imaging 2013; 39:901-10. [DOI: 10.1002/jmri.24251] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2012] [Accepted: 05/09/2013] [Indexed: 12/24/2022] Open
Affiliation(s)
- Henk Smit
- Departments of Medical Informatics and Radiology; Erasmus MC; Rotterdam The Netherlands
| | | | - Jamal Guenoun
- Department of Radiology; Erasmus MC; Rotterdam the Netherlands
| | - Dirk H. J. Poot
- Departments of Medical Informatics and Radiology; Erasmus MC; Rotterdam The Netherlands
| | | | | | - Monique R. Bernsen
- Department of Radiology; Erasmus MC; Rotterdam the Netherlands
- Department of Nuclear Medicine; Erasmus MC; Rotterdam the Netherlands
| | | | - Stefan Klein
- Departments of Medical Informatics and Radiology; Erasmus MC; Rotterdam The Netherlands
| | - Gyula Kotek
- Department of Radiology; Erasmus MC; Rotterdam the Netherlands
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Guenoun J, Ruggiero A, Doeswijk G, Janssens RC, Koning GA, Kotek G, Krestin GP, Bernsen MR. In vivoquantitative assessment of cell viability of gadolinium or iron-labeled cells using MRI and bioluminescence imaging. Contrast Media Mol Imaging 2012; 8:165-74. [DOI: 10.1002/cmmi.1513] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2012] [Revised: 08/21/2012] [Accepted: 09/10/2012] [Indexed: 01/09/2023]
Affiliation(s)
- Jamal Guenoun
- Department of Radiology; Erasmus MC - University Medical Center Rotterdam; Rotterdam; The Netherlands
| | - Alessandro Ruggiero
- Department of Radiology; Erasmus MC - University Medical Center Rotterdam; Rotterdam; The Netherlands
| | - Gabriela Doeswijk
- Department of Radiology; Erasmus MC - University Medical Center Rotterdam; Rotterdam; The Netherlands
| | - Roel C. Janssens
- Department of Genetics; Erasmus MC - University Medical Center Rotterdam; Rotterdam; The Netherlands
| | - Gerben A. Koning
- Laboratory of Experimental Surgical Oncology, Section Surgical Oncology, Department of Surgery; Erasmus MC - University Medical Center Rotterdam; Rotterdam; The Netherlands
| | - Gyula Kotek
- Department of Radiology; Erasmus MC - University Medical Center Rotterdam; Rotterdam; The Netherlands
| | - Gabriel P. Krestin
- Department of Radiology; Erasmus MC - University Medical Center Rotterdam; Rotterdam; The Netherlands
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van Tiel J, Bron EE, Tiderius CJ, Bos PK, Reijman M, Klein S, Verhaar JAN, Krestin GP, Weinans H, Kotek G, Oei EHG. Reproducibility of 3D delayed gadolinium enhanced MRI of cartilage (dGEMRIC) of the knee at 3.0 T in patients with early stage osteoarthritis. Eur Radiol 2012; 23:496-504. [PMID: 22886535 DOI: 10.1007/s00330-012-2616-x] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2012] [Revised: 06/19/2012] [Accepted: 07/12/2012] [Indexed: 11/24/2022]
Abstract
OBJECTIVES To assess the reproducibility of 3D delayed gadolinium-enhanced MRI of cartilage (dGEMRIC) at 3 T in early stage knee osteoarthritis (OA) patients. METHODS In 20 patients, 3D dGEMRIC at 3 T was acquired twice within 7 days. To correct for patient motion during acquisition, all images were rigidly registered in 3D. Eight anatomical cartilage ROIs were analysed on both images of each patient. Capability of dGEMRIC to yield T1 maps that reproducibly distinguish spatial differences in cartilage quality was assessed in two ROIs within a single slice in each patient. Reproducibility was assessed using ICCs and Bland-Altman plots. RESULTS ICCs ranged from 0.87 to 0.95, indicating good reproducibility. T1 maps revealed reproducible spatial differences in cartilage quality (ICC 0.79). Based on the Bland-Altman plots, we defined a threshold of 95 ms to determine if a change in dGEMRIC outcome in longitudinal research was statistically significant. CONCLUSIONS 3D knee dGEMRIC at 3 T combined with 3D image registration is a highly reproducible measure of cartilage quality in early stage OA. Therefore, dGEMRIC may be a valuable tool in the non-invasive evaluation of cartilage quality changes in longitudinal research in patients with early stage OA and focal cartilage defects.
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Affiliation(s)
- J van Tiel
- Department of Radiology, Erasmus Medical Center, Rotterdam, The Netherlands.
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20
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Kotek G, van Tiel ST, Wielopolski PA, Houston GC, Krestin GP, Bernsen MR. Cell quantification: evolution of compartmentalization and distribution of iron-oxide particles and labeled cells. Contrast Media Mol Imaging 2012; 7:195-203. [DOI: 10.1002/cmmi.481] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Gyula Kotek
- Department of Radiology; Erasmus MC; Rotterdam The Netherlands
| | | | | | - Gavin C. Houston
- Applied Science Laboratory; General Electric Healthcare; The Netherlands
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21
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Plenge E, Poot DHJ, Bernsen M, Kotek G, Houston G, Wielopolski P, van der Weerd L, Niessen WJ, Meijering E. Super-resolution methods in MRI: can they improve the trade-off between resolution, signal-to-noise ratio, and acquisition time? Magn Reson Med 2012; 68:1983-93. [PMID: 22298247 DOI: 10.1002/mrm.24187] [Citation(s) in RCA: 109] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2011] [Revised: 11/23/2011] [Accepted: 01/05/2012] [Indexed: 11/09/2022]
Abstract
Improving the resolution in magnetic resonance imaging comes at the cost of either lower signal-to-noise ratio, longer acquisition time or both. This study investigates whether so-called super-resolution reconstruction methods can increase the resolution in the slice selection direction and, as such, are a viable alternative to direct high-resolution acquisition in terms of the signal-to-noise ratio and acquisition time trade-offs. The performance of six super-resolution reconstruction methods and direct high-resolution acquisitions was compared with respect to these trade-offs. The methods are based on iterative back-projection, algebraic reconstruction, and regularized least squares. The algorithms were applied to low-resolution data sets within which the images were rotated relative to each other. Quantitative experiments involved a computational phantom and a physical phantom containing structures of known dimensions. To visually validate the quantitative evaluations, qualitative experiments were performed, in which images of three different subjects (a phantom, an ex vivo rat knee, and a postmortem mouse) were acquired with different magnetic resonance imaging scanners. The results show that super-resolution reconstruction can indeed improve the resolution, signal-to-noise ratio and acquisition time trade-offs compared with direct high-resolution acquisition.
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Affiliation(s)
- Esben Plenge
- Department of Medical Informatics, Biomedical Imaging Group Rotterdam, Erasmus MC-University Medical Center, Rotterdam, Rotterdam, The Netherlands.
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22
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van Buul GM, Kotek G, Wielopolski PA, Farrell E, Bos PK, Weinans H, Grohnert AU, Jahr H, Verhaar JAN, Krestin GP, van Osch GJVM, Bernsen MR. Clinically translatable cell tracking and quantification by MRI in cartilage repair using superparamagnetic iron oxides. PLoS One 2011; 6:e17001. [PMID: 21373640 PMCID: PMC3044153 DOI: 10.1371/journal.pone.0017001] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2010] [Accepted: 01/18/2011] [Indexed: 01/06/2023] Open
Abstract
BACKGROUND Articular cartilage has very limited intrinsic regenerative capacity, making cell-based therapy a tempting approach for cartilage repair. Cell tracking can be a major step towards unraveling and improving the repair process of these therapies. We studied superparamagnetic iron oxides (SPIO) for labeling human bone marrow-derived mesenchymal stem cells (hBMSCs) regarding effectivity, cell viability, long term metabolic cell activity, chondrogenic differentiation and hBMSC secretion profile. We additionally examined the capacity of synovial cells to endocytose SPIO from dead, labeled cells, together with the use of magnetic resonance imaging (MRI) for intra-articular visualization and quantification of SPIO labeled cells. METHODOLOGY/PRINICIPAL FINDINGS Efficacy and various safety aspects of SPIO cell labeling were determined using appropriate assays. Synovial SPIO re-uptake was investigated in vitro by co-labeling cells with SPIO and green fluorescent protein (GFP). MRI experiments were performed on a clinical 3.0T MRI scanner. Two cell-based cartilage repair techniques were mimicked for evaluating MRI traceability of labeled cells: intra-articular cell injection and cell implantation in cartilage defects. Cells were applied ex vivo or in vitro in an intra-articular environment and immediately scanned. SPIO labeling was effective and did not impair any of the studied safety aspects, including hBMSC secretion profile. SPIO from dead, labeled cells could be taken up by synovial cells. Both injected and implanted SPIO-labeled cells could accurately be visualized by MRI in a clinically relevant sized joint model using clinically applied cell doses. Finally, we quantified the amount of labeled cells seeded in cartilage defects using MR-based relaxometry. CONCLUSIONS SPIO labeling appears to be safe without influencing cell behavior. SPIO labeled cells can be visualized in an intra-articular environment and quantified when seeded in cartilage defects.
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Affiliation(s)
- Gerben M. van Buul
- Department of Radiology, Erasmus MC, Rotterdam, The Netherlands
- Department of Orthopaedics, Erasmus MC, Rotterdam, The Netherlands
| | - Gyula Kotek
- Department of Radiology, Erasmus MC, Rotterdam, The Netherlands
| | | | - Eric Farrell
- Department of Orthopaedics, Erasmus MC, Rotterdam, The Netherlands
- Department of Otorhinolaryngology, Erasmus MC, Rotterdam, The Netherlands
| | - P. Koen Bos
- Department of Orthopaedics, Erasmus MC, Rotterdam, The Netherlands
| | - Harrie Weinans
- Department of Orthopaedics, Erasmus MC, Rotterdam, The Netherlands
- Department of Biomechanical Engineering, Delft University of Technology, Delft, The Netherlands
| | - Anja U. Grohnert
- Department of Internal Medicine, Erasmus MC, Rotterdam, The Netherlands
| | - Holger Jahr
- Department of Orthopaedics, Erasmus MC, Rotterdam, The Netherlands
| | | | | | - Gerjo J. V. M. van Osch
- Department of Orthopaedics, Erasmus MC, Rotterdam, The Netherlands
- Department of Otorhinolaryngology, Erasmus MC, Rotterdam, The Netherlands
| | - Monique R. Bernsen
- Department of Radiology, Erasmus MC, Rotterdam, The Netherlands
- * E-mail:
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Auer T, Pinter S, Kovacs N, Kalmar Z, Nagy F, Horvath RA, Koszo B, Kotek G, Perlaki G, Koves M, Kalman B, Komoly S, Schwarcz A, Woermann FG, Janszky J. Does obstetric brachial plexus injury influence speech dominance? Ann Neurol 2009; 65:57-66. [DOI: 10.1002/ana.21538] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [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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Feldmann A, Trauninger A, Toth L, Kotek G, Kosztolanyi P, Illes E, Pfund Z, Komoly S, Nagy F, Illes Z. Atrophy and decreased activation of fronto-parietal attention areas contribute to higher visual dysfunction in posterior cortical atrophy. Psychiatry Res 2008; 164:178-84. [PMID: 18945600 DOI: 10.1016/j.pscychresns.2008.01.006] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/24/2007] [Revised: 12/05/2007] [Accepted: 01/13/2008] [Indexed: 11/26/2022]
Abstract
Voxel-based morphometry and functional magnetic resonance imaging demonstrated severe atrophy and decreased activation of visual attention areas and occipital lobes in a patient with early posterior cortical atrophy compared with healthy controls and patients with early Alzheimer's disease. Our complex approach indicates that structures responsible for attention can be damaged early in posterior cortical atrophy and may contribute to the characteristic decline in higher visual functions.
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Affiliation(s)
- Adam Feldmann
- Department of Neurology, University of Pecs, 2 Ret St, Pecs, 7623 Hungary
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25
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Kotek G, Berente Z, Schwarcz A, Vajda Z, Hadjiev J, Horvath I, Repa I, Miseta A, Bogner P. Effects of intra- and extracellular space properties on diffusion and T(2) relaxation in a tissue model. Magn Reson Imaging 2008; 27:279-84. [PMID: 18768282 DOI: 10.1016/j.mri.2008.07.010] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2008] [Revised: 04/15/2008] [Accepted: 07/13/2008] [Indexed: 11/30/2022]
Abstract
The purpose of this study was to investigate the effects of biophysical factors on the diffusion and the relaxation time T(2) independently. Certain properties of the extracellular and the intracellular space may change radically in pathological conditions resulting in water diffusion changes. A tissue model consisting of red blood cells was studied. The extra- and intracellular spaces were modified osmotically and by suspending medium concentration. Diffusion measurements were evaluated with regard to the effective medium theory. Neither the nature of the protein in the extracellular space nor an increased level of intracellular hydration caused a significant net water diffusion change in the cell suspension. The relaxation time T(2) exhibited very little dependence on the extracellular volume fraction or the concentration or the nature of the protein in the extracellular space. An increased level of intracellular hydration resulted in systematically larger T(2) values. It seems probable that increases in extracellular protein concentrations or in the extent of intracellular hydration do not play a significant role in the diffusion changes detected in pathological conditions. T(2) appears to depend on the level of hydration or the total water content but is seemingly less dependent of the concentration and the nature of the extracellular protein in our model solutions.
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Affiliation(s)
- Gyula Kotek
- Institute of Diagnostic Imaging and Radiation Oncology, Health Science Center, University of Kaposvár, H-7400 Kaposvár, Hungary
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Bajzik G, Auer T, Bogner P, Aradi M, Kotek G, Repa I, Doczi T, Schwarcz A. Quantitative brain proton MR spectroscopy based on measurement of the relaxation time T1of water. J Magn Reson Imaging 2008; 28:34-8. [DOI: 10.1002/jmri.21192] [Citation(s) in RCA: 4] [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] [Indexed: 11/10/2022] Open
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27
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Auer T, Barsi P, Bone B, Angyalosi A, Aradi M, Szalay C, Horvath RA, Kovacs N, Kotek G, Fogarasi A, Komoly S, Janszky I, Schwarcz A, Janszky J. History of simple febrile seizures is associated with hippocampal abnormalities in adults. Epilepsia 2008; 49:1562-9. [PMID: 18503555 DOI: 10.1111/j.1528-1167.2008.01679.x] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
SUMMARY BACKGROUND It is unclear whether the hippocampal abnormality in temporal lobe epilepsy (TLE) is a consequence or the cause of afebrile or febrile seizures (FSs). We investigated whether hippocampal abnormalities are present in healthy adults>15 years after a simple FS. METHODS Eight healthy subjects (5 men) with a history of simple FS (FS+ group) and eight sex- and aged-matched control subjects (FS- group) were investigated by three MR methods: blinded visual inspection of the MRI pictures; automatic voxel-based volumetry; and T2 relaxation time measurements. RESULTS The mean total volume of the two hippocampi was 5.36 +/- 1.33 cm(3)in the FS+ group and 6.63 +/- 1.46 cm(3)in the FS- group (p = 0.069). The T2 values in the anterior part of the left hippocampus (p = 0.036) and in the middle part of the right hippocampus (p = 0.025) were elevated in the FS+ subjects. The mean volume of the right hippocampus was 3.05 +/- 0.8 cm(3)in the FS+ men and 4.05 +/- 0.48 cm(3)in the FS- men (p = 0.043). The mean total volume of the two hippocampi was 5.38 +/- 1.4 cm(3)in the FS+ men and 7.48 +/- 1.14 cm(3)in the FS- men (p = 0.043). There were three FS+ men in whom hippocampal abnormalities including hippocampal sclerosis (HS) and dysgenesis were observed on visual inspection. CONCLUSIONS A history of simple FS in childhood can be associated with hippocampal abnormalities in adults. These abnormalities are probably more pronounced in men. Simple FS may not be as a benign event as previously thought. Our findings suggest that hippocampal abnormalities associated with FS are not necessarily epileptogenic.
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Affiliation(s)
- Tibor Auer
- Department of Neurology, University of Pécs, Pécs, Hungary
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Holló G, Nuernberg G, Bogner P, Kotek G, Nuernberg K, Holló I, Seregi J, Ender K, Repa I. Der Einfluss der Fütterung auf die Zusammensetzung verschiedener Fettdepots von Jungbullen der Rassen Ungarisches Grauvieh und Holstein Friesian – 2. Mitteilung: <sup>1</sup>H- Nuclear Magnetic Resonance (NMR) Untersuchungen. Arch Anim Breed 2007. [DOI: 10.5194/aab-50-25-2007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
Abstract. Title of the paper: Effect of feeding on the fatty acid composition of different fatty tissues of Hungarian Grey and Holstein Friesian bulls. II. 1H-Nuclear Magnetic Resonance (NMR) investigations In this attempt the relaxation times using 1H-NMR spectroscopy from three different (subcutaneous, perinephric and internal fat) fat depots of Hungarian Grey and Holstein Friesian extensive or intensive fattened young bulls were measured. The relaxation properties were compared with the analysis of fatty acid compostion. The different diets and the sample location have a higher influence on the relaxation times than the breed. In fat samples from extensive groups the T1-relaxation time was longer, while the T2-relaxation time was significantly shorter in intensive fed groups. The T2-relaxation time, as well as the relaxation time of T21- und T22-components were the shortest in extensive fed animals, while the proportion of T21-component was the highest in kidney fat, furthermore the difference was statistics proved. The T2-relaxation time showed a close negative relationship with the ratio of saturated fatty acids (SFA). The ratio of v21 and v22 depends on chemical composition of fat samples. In fat tissues with a high SFA percentage caused a higher proportion of v21. It is suggested that differences in fatty acid compositon of fat samples caused also alteration in the relaxation time.
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Kovacs N, Nagy F, Kover F, Feldmann A, Llumiguano C, Janszky J, Kotek G, Doczi T, Balas I. Implanted deep brain stimulator and 1.0-Tesla magnetic resonance imaging. J Magn Reson Imaging 2007; 24:1409-12. [PMID: 17083120 DOI: 10.1002/jmri.20779] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [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: 11/07/2022] Open
Abstract
There is a great need for MRI examinations of patients who have previously undergone deep brain stimulator (DBS) implantation. The current guidelines pertain only to a 1.5-Tesla horizontal-bore scanner complying with strict safety regulations. Moreover, almost all published in vitro and in vivo studies concerning patient safety are carried out on 1.5 Tesla MR scanners. The aim of our work is to share our clinical experience of 1.0-Tesla brain MR imaging. During the past four years, 34 patients with different types of implanted DBS systems underwent 1.0-Tesla MR examinations to answer diagnostic or clinical questions. Apart from the scanner type applied, all other safety instructions were strictly followed. The MRI itself made no significant difference to the measured impedances or the stimulation parameters required to achieve the optimal therapeutic results. From theoretical considerations, it may be assumed that 1.0-Tesla MRI can be performed safely on DBS-implanted patients, provided that all other recommendations are adhered to.
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Affiliation(s)
- Norbert Kovacs
- Department of Neurology, University of Pecs, Pecs, Hungary.
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Schwarcz A, Ursprung Z, Berente Z, Bogner P, Kotek G, Meric P, Gillet B, Beloeil JC, Dóczi T. In vivo brain edema classification: New insight offered by large b-value diffusion-weighted MR imaging. J Magn Reson Imaging 2007; 25:26-31. [PMID: 17173312 DOI: 10.1002/jmri.20789] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [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: 11/07/2022] Open
Abstract
PURPOSE To assess the role of large b-value diffusion weighted imaging (DWI) in the characterization of the physicochemical properties of the water in brain edema under experimental and clinical conditions. MATERIALS AND METHODS Vasogenic brain edema was induced in mice by means of cold injury. A total of 17 patients with extensive peritumoral brain edema were also investigated. The longitudinal relaxation time (T(1)) and apparent diffusion coefficient (D) were measured in the edematous area both in humans and in mice. D was calculated by using both mono- (D(mono)) and biexponential (D(fast) and D(slow)) approaches in the low and overall range of b-values, respectively. The D values were correlated with the T(1) values. RESULTS A strong linear correlation was found between T(1) and D(mono) in vasogenic brain edema, both in humans and in mice. After breakdown of D(mono) into fast and slow diffusing components, only D(fast) exhibited a strong correlation with T(1); D(slow) was unchanged in vasogenic brain edema. CONCLUSION Large b-value DWI can furnish a detailed characterization of vasogenic brain edema, and may provide a quantitative approach for the differentiation of edema types on the basis of the physicochemical properties of the water molecules. Application of the DWI method may permit prediction and follow-up of the effects of antiedematous therapy.
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Affiliation(s)
- Attila Schwarcz
- Department of Neurosurgery, University of Pécs, Pécs, Hungary.
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31
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Bogner P, Miseta A, Berente Z, Schwarcz A, Kotek G, Repa I. Osmotic and diffusive properties of intracellular water in camel erythrocytes: Effect of hemoglobin crowdedness. Cell Biol Int 2005; 29:731-6. [PMID: 15951204 DOI: 10.1016/j.cellbi.2005.04.008] [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] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2005] [Revised: 04/18/2005] [Accepted: 04/18/2005] [Indexed: 11/28/2022]
Abstract
Camel erythrocytes have exceptional osmotic resistance and is believed to be due to augmented water-binding associated with the high hydrophilicity of camel hemoglobin. In practical terms this means that the proportion of osmotically non-removable water in camel erythrocytes is nearly 3-fold greater than that in human erythrocytes (approximately 65 vs approximately 20%). The relationship between water diffusion and the osmotic characteristics of intracellular water is the subject of this report. The amount of osmotically inactive water is 2-fold greater in camel hemoglobin solution in vitro compared to that of human, but water diffusion does not differ in camel and human hemoglobin solutions. However, the evaluation of water diffusion by magnetic resonance measurements in camel erythrocytes revealed approximately 15% lower apparent diffusion coefficient (ADC) compared with human erythrocytes. When human erythrocytes were dehydrated to the level of camel erythrocytes, their osmotic and water diffusion properties were similar. These results show that a lower ADC is associated with a more pronounced increase in osmotically inactive water fraction. It is proposed that increased hemoglobin hydrophilicity allows not only augmented water-binding, but also a closer hemoglobin packaging in vivo, which in turn is associated with slower ADC and increased osmotic resistance.
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Affiliation(s)
- Peter Bogner
- Institute of Diagnostic Imaging and Radiation Oncology, University of Kaposvár, 7400 Kaposvár, Guba S.u. 40, Hungary.
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