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Julie L, Ikram D, Mailyn PL, Augustin L, Afef B, Joevin S, Bentoumi I, Cuenod CA, Daniel B. A free time point model for dynamic contrast enhanced exploration. Magn Reson Imaging 2021; 80:39-49. [PMID: 33905829 DOI: 10.1016/j.mri.2021.04.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2021] [Revised: 04/08/2021] [Accepted: 04/21/2021] [Indexed: 02/07/2023]
Abstract
Dynamic-Contrast-Enhanced (DCE) Imaging has been widely studied to characterize microcirculatory disorders associated with various diseases. Although numerous studies have demonstrated its diagnostic interest, the physiological interpretation using pharmacokinetic models often remains debatable. Indeed, to be interpretable, a model must provide, at first instance, an accurate description of the DCE data. However, the evaluation and optimization of this accuracy remain rather limited in DCE. Here we established a non-linear Free-Time-Point-Hermite (FTPH) data-description model designed to fit DCE data accurately. Its performance was evaluated on data generated using two contrasting pharmacokinetic microcirculatory hypotheses (MH). The accuracy of data description of the models was evaluated by calculating the mean squared error (QE) from initial and assessed tissue impulse responses. Then, FTPH assessments were provided to blinded observers to evaluate if these assessments allowed observers to identify MH in their data. Regardless of the initial pharmacokinetic model used for data generation, QE was lower than 3% for the noise-free datasets and increased up to 10% for a signal-to-noise-ratio (SNR) of 20. Under SNR = 20, the sensitivity and specificity of the MH identification were over 80%. The performance of the FTPH model was higher than that of the B-Spline model used as a reference. The accuracy of the FTPH model regardless of the initial MH provided an opportunity to have a reference to check the accuracy of other pharmacokinetic models.
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Affiliation(s)
- Levebvre Julie
- Université de Paris, PARCC, INSERM, Paris F-75015, France
| | - Djebali Ikram
- Université de Paris, PARCC, INSERM, Paris F-75015, France
| | | | | | | | - Sourdon Joevin
- Université de Paris, PARCC, INSERM, Paris F-75015, France.
| | - Isma Bentoumi
- Université de Paris, PARCC, INSERM, Paris F-75015, France
| | - Charles-André Cuenod
- Université de Paris, PARCC, INSERM, Paris F-75015, France; Service Radiologie, AP-HP, Hôpital Européen Georges Pompidou, F-75015, France.
| | - Balvay Daniel
- Université de Paris, PARCC, INSERM, Paris F-75015, France; Université de Paris, Plateforme d'Imageries du Vivant, F-75015, France.
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Lecler A, Balvay D, Cuenod C, Marais L, Zmuda M, Sadik J, Galatoire O, Farah E, El Methni J, Zuber K, Bergès O, Savatovsky J, Fournier L. Quality‐based pharmacokinetic model selection on DCE‐MRI for characterizing orbital lesions. J Magn Reson Imaging 2019; 50:1514-1525. [DOI: 10.1002/jmri.26747] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2018] [Revised: 03/15/2019] [Accepted: 03/18/2019] [Indexed: 12/18/2022] Open
Affiliation(s)
- Augustin Lecler
- Department of NeuroradiologyFoundation Adolphe de Rothschild Hospital Paris France
- Université Paris Descartes Sorbonne Paris Cité, INSERM UMR‐S970Cardiovascular Research Center – PARCC Paris France
| | - Daniel Balvay
- Université Paris Descartes Sorbonne Paris Cité, INSERM UMR‐S970Cardiovascular Research Center – PARCC Paris France
| | - Charles‐André Cuenod
- Université Paris Descartes Sorbonne Paris Cité, INSERM UMR‐S970Cardiovascular Research Center – PARCC Paris France
- Radiology Department, Hôpital Européen Georges PompidouUniversité Paris Descartes Sorbonne Paris Cité, Assistance Publique‐Hôpitaux de Paris Paris France
| | - Louise Marais
- Université Paris Descartes Sorbonne Paris Cité, INSERM UMR‐S970Cardiovascular Research Center – PARCC Paris France
| | - Mathieu Zmuda
- Department of Orbitopalpebral SurgeryFoundation Adolphe de Rothschild Hospital Paris France
| | - Jean‐Claude Sadik
- Department of NeuroradiologyFoundation Adolphe de Rothschild Hospital Paris France
| | - Olivier Galatoire
- Department of Orbitopalpebral SurgeryFoundation Adolphe de Rothschild Hospital Paris France
| | - Edgar Farah
- Department of Orbitopalpebral SurgeryFoundation Adolphe de Rothschild Hospital Paris France
| | - Jonathan El Methni
- MAP5, UMR CNRS 8145Université Paris Descartes Sorbonne Paris Cité France
| | - Kevin Zuber
- Department of Clinical ResearchFoundation Adolphe de Rothschild Hospital Paris France
| | - Olivier Bergès
- Department of NeuroradiologyFoundation Adolphe de Rothschild Hospital Paris France
| | - Julien Savatovsky
- Department of NeuroradiologyFoundation Adolphe de Rothschild Hospital Paris France
| | - Laure Fournier
- Université Paris Descartes Sorbonne Paris Cité, INSERM UMR‐S970Cardiovascular Research Center – PARCC Paris France
- Radiology Department, Hôpital Européen Georges PompidouUniversité Paris Descartes Sorbonne Paris Cité, Assistance Publique‐Hôpitaux de Paris Paris France
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Duron L, Balvay D, Vande Perre S, Bouchouicha A, Savatovsky J, Sadik JC, Thomassin-Naggara I, Fournier L, Lecler A. Gray-level discretization impacts reproducible MRI radiomics texture features. PLoS One 2019; 14:e0213459. [PMID: 30845221 PMCID: PMC6405136 DOI: 10.1371/journal.pone.0213459] [Citation(s) in RCA: 113] [Impact Index Per Article: 22.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2018] [Accepted: 02/21/2019] [Indexed: 12/28/2022] Open
Abstract
OBJECTIVES To assess the influence of gray-level discretization on inter- and intra-observer reproducibility of texture radiomics features on clinical MR images. MATERIALS AND METHODS We studied two independent MRI datasets of 74 lacrymal gland tumors and 30 breast lesions from two different centers. Two pairs of readers performed three two-dimensional delineations for each dataset. Texture features were extracted using two radiomics softwares (Pyradiomics and an in-house software). Reproducible features were selected using a combination of intra-class correlation coefficient (ICC) and concordance and coherence coefficient (CCC) with 0.8 and 0.9 as thresholds, respectively. We tested six absolute and eight relative gray-level discretization methods and analyzed the distribution and highest number of reproducible features obtained for each discretization. We also analyzed the number of reproducible features extracted from computer simulated delineations representative of inter-observer variability. RESULTS The gray-level discretization method had a direct impact on texture feature reproducibility, independent of observers, software or method of delineation (simulated vs. human). The absolute discretization consistently provided statistically significantly more reproducible features than the relative discretization. Varying the bin number of relative discretization led to statistically significantly more variable results than varying the bin size of absolute discretization. CONCLUSIONS When considering inter-observer reproducible results of MRI texture radiomics features, an absolute discretization should be favored to allow the extraction of the highest number of potential candidates for new imaging biomarkers. Whichever the chosen method, it should be systematically documented to allow replicability of results.
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Affiliation(s)
- Loïc Duron
- Department of Radiology, Fondation Ophtalmologique Adolphe de Rothschild, Paris, France
- Université Paris Descartes Sorbonne Paris Cité, INSERM UMR-S970, Cardiovascular Research Center—PARCC, Paris, France
| | - Daniel Balvay
- Université Paris Descartes Sorbonne Paris Cité, INSERM UMR-S970, Cardiovascular Research Center—PARCC, Paris, France
| | - Saskia Vande Perre
- Université Paris Descartes Sorbonne Paris Cité, INSERM UMR-S970, Cardiovascular Research Center—PARCC, Paris, France
| | - Afef Bouchouicha
- Université Paris Descartes Sorbonne Paris Cité, INSERM UMR-S970, Cardiovascular Research Center—PARCC, Paris, France
| | - Julien Savatovsky
- Department of Radiology, Fondation Ophtalmologique Adolphe de Rothschild, Paris, France
| | - Jean-Claude Sadik
- Department of Radiology, Fondation Ophtalmologique Adolphe de Rothschild, Paris, France
| | - Isabelle Thomassin-Naggara
- Université Paris Descartes Sorbonne Paris Cité, INSERM UMR-S970, Cardiovascular Research Center—PARCC, Paris, France
- Sorbonne Universités, UPMC Univ Paris 06, Institut Universitaire de Cancérologie, Assistance Publique-Hôpitaux de Paris (AP-HP), Hôpital Tenon, Service d'Imagerie, 4 rue de la Chine, Paris, France
| | - Laure Fournier
- Université Paris Descartes Sorbonne Paris Cité, INSERM UMR-S970, Cardiovascular Research Center—PARCC, Paris, France
- Université Paris Descartes Sorbonne Paris Cité, Assistance Publique-Hôpitaux de Paris, Hôpital Européen Georges Pompidou, Radiology Department, Paris, France
| | - Augustin Lecler
- Department of Radiology, Fondation Ophtalmologique Adolphe de Rothschild, Paris, France
- Université Paris Descartes Sorbonne Paris Cité, INSERM UMR-S970, Cardiovascular Research Center—PARCC, Paris, France
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Roy S, Cheong DLH, Yan J, Totman JJ, Ng T, Khor LK, Goh J, Tham IWK. Serial FDG-PET/MR Imaging for Head and Neck Cancer Radiation Therapy: A Pilot Study. IEEE TRANSACTIONS ON RADIATION AND PLASMA MEDICAL SCIENCES 2017. [DOI: 10.1109/tns.2016.2616884] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Doury M, Dizeux A, de Cesare A, Lucidarme O, Pellot-Barakat C, Bridal SL, Frouin F. Quantification of tumor perfusion using dynamic contrast-enhanced ultrasound: impact of mathematical modeling. Phys Med Biol 2016; 62:1113-1125. [PMID: 27992383 DOI: 10.1088/1361-6560/aa54a3] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Dynamic contrast-enhanced ultrasound has been proposed to monitor tumor therapy, as a complement to volume measurements. To assess the variability of perfusion parameters in ideal conditions, four consecutive test-retest studies were acquired in a mouse tumor model, using controlled injections. The impact of mathematical modeling on parameter variability was then investigated. Coefficients of variation (CV) of tissue blood volume (BV) and tissue blood flow (BF) based-parameters were estimated inside 32 sub-regions of the tumors, comparing the log-normal (LN) model with a one-compartment model fed by an arterial input function (AIF) and improved by the introduction of a time delay parameter. Relative perfusion parameters were also estimated by normalization of the LN parameters and normalization of the one-compartment parameters estimated with the AIF, using a reference tissue (RT) region. A direct estimation (rRTd) of relative parameters, based on the one-compartment model without using the AIF, was also obtained by using the kinetics inside the RT region. Results of test-retest studies show that absolute regional parameters have high CV, whatever the approach, with median values of about 30% for BV, and 40% for BF. The positive impact of normalization was established, showing a coherent estimation of relative parameters, with reduced CV (about 20% for BV and 30% for BF using the rRTd approach). These values were significantly lower (p < 0.05) than the CV of absolute parameters. The rRTd approach provided the smallest CV and should be preferred for estimating relative perfusion parameters.
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Affiliation(s)
- Maxime Doury
- Laboratoire d'Imagerie Biomédicale (LIB), CNRS, Inserm, UPMC Univ. Paris 06, Sorbonne Universités, Paris, France
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Response to characterization of orbital masses by multiparametric MRI. Eur J Radiol 2016; 85:1686-7. [PMID: 27397419 DOI: 10.1016/j.ejrad.2016.06.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2016] [Accepted: 06/22/2016] [Indexed: 11/24/2022]
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Kim SM, Haider MA, Jaffray DA, Yeung IWT. Improved accuracy of quantitative parameter estimates in dynamic contrast-enhanced CT study with low temporal resolution. Med Phys 2016; 43:388. [PMID: 26745932 DOI: 10.1118/1.4937600] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
PURPOSE A previously proposed method to reduce radiation dose to patient in dynamic contrast-enhanced (DCE) CT is enhanced by principal component analysis (PCA) filtering which improves the signal-to-noise ratio (SNR) of time-concentration curves in the DCE-CT study. The efficacy of the combined method to maintain the accuracy of kinetic parameter estimates at low temporal resolution is investigated with pixel-by-pixel kinetic analysis of DCE-CT data. METHODS The method is based on DCE-CT scanning performed with low temporal resolution to reduce the radiation dose to the patient. The arterial input function (AIF) with high temporal resolution can be generated with a coarsely sampled AIF through a previously published method of AIF estimation. To increase the SNR of time-concentration curves (tissue curves), first, a region-of-interest is segmented into squares composed of 3 × 3 pixels in size. Subsequently, the PCA filtering combined with a fraction of residual information criterion is applied to all the segmented squares for further improvement of their SNRs. The proposed method was applied to each DCE-CT data set of a cohort of 14 patients at varying levels of down-sampling. The kinetic analyses using the modified Tofts' model and singular value decomposition method, then, were carried out for each of the down-sampling schemes between the intervals from 2 to 15 s. The results were compared with analyses done with the measured data in high temporal resolution (i.e., original scanning frequency) as the reference. RESULTS The patients' AIFs were estimated to high accuracy based on the 11 orthonormal bases of arterial impulse responses established in the previous paper. In addition, noise in the images was effectively reduced by using five principal components of the tissue curves for filtering. Kinetic analyses using the proposed method showed superior results compared to those with down-sampling alone; they were able to maintain the accuracy in the quantitative histogram parameters of volume transfer constant [standard deviation (SD), 98th percentile, and range], rate constant (SD), blood volume fraction (mean, SD, 98th percentile, and range), and blood flow (mean, SD, median, 98th percentile, and range) for sampling intervals between 10 and 15 s. CONCLUSIONS The proposed method of PCA filtering combined with the AIF estimation technique allows low frequency scanning for DCE-CT study to reduce patient radiation dose. The results indicate that the method is useful in pixel-by-pixel kinetic analysis of DCE-CT data for patients with cervical cancer.
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Affiliation(s)
- Sun Mo Kim
- Radiation Medicine Program, Princess Margaret Hospital/University Health Network, Toronto, Ontario M5G 2M9, Canada
| | - Masoom A Haider
- Department of Medical Imaging, Sunnybrook Health Sciences Centre, Toronto, Ontario M4N 3M5, Canada and Department of Medical Imaging, University of Toronto, Toronto, Ontario M5G 2M9, Canada
| | - David A Jaffray
- Radiation Medicine Program, Princess Margaret Hospital/University Health Network, Toronto, Ontario M5G 2M9, Canada and Department of Radiation Oncology, University of Toronto, Toronto, Ontario M5G 2M9, Canada
| | - Ivan W T Yeung
- Radiation Medicine Program, Princess Margaret Hospital/University Health Network, Toronto, Ontario M5G 2M9, Canada; Department of Medical Physics, Stronach Regional Cancer Centre, Southlake Regional Health Centre, Newmarket, Ontario L3Y 2P9, Canada; and Department of Radiation Oncology, University of Toronto, Toronto, Ontario M5G 2M9, Canada
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Azahaf M, Haberley M, Betrouni N, Ernst O, Behal H, Duhamel A, Ouzzane A, Puech P. Impact of arterial input function selection on the accuracy of dynamic contrast-enhanced MRI quantitative analysis for the diagnosis of clinically significant prostate cancer. J Magn Reson Imaging 2015; 43:737-49. [DOI: 10.1002/jmri.25034] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2015] [Accepted: 08/06/2015] [Indexed: 01/06/2023] Open
Affiliation(s)
- Mustapha Azahaf
- Department of Gastrointestinal Imaging; CHU Lille, Université de Lille; Lille France
- INSERM, U1189, CHU Lille, Université de Lille; Lille France
| | - Marc Haberley
- Department of Gastrointestinal Imaging; CHU Lille, Université de Lille; Lille France
| | - Nacim Betrouni
- INSERM, U1189, CHU Lille, Université de Lille; Lille France
| | - Olivier Ernst
- Department of Gastrointestinal Imaging; CHU Lille, Université de Lille; Lille France
- INSERM, U1189, CHU Lille, Université de Lille; Lille France
| | - Hélène Behal
- Methodolgy and Biostatistics Units, EA2964, UDSL2, CHU Lille, Université de Lille; Lille France
| | - Alain Duhamel
- Methodolgy and Biostatistics Units, EA2964, UDSL2, CHU Lille, Université de Lille; Lille France
| | - Adil Ouzzane
- INSERM, U1189, CHU Lille, Université de Lille; Lille France
- Department of Urology; CHU Lille, Université de Lille; Lille France
| | - Philippe Puech
- INSERM, U1189, CHU Lille, Université de Lille; Lille France
- Department of Genitourinary Imaging; CHU Lille, Université de Lille; Lille France
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Barnes SR, Ng TSC, Santa-Maria N, Montagne A, Zlokovic BV, Jacobs RE. ROCKETSHIP: a flexible and modular software tool for the planning, processing and analysis of dynamic MRI studies. BMC Med Imaging 2015; 15:19. [PMID: 26076957 PMCID: PMC4466867 DOI: 10.1186/s12880-015-0062-3] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2015] [Accepted: 05/29/2015] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) is a promising technique to characterize pathology and evaluate treatment response. However, analysis of DCE-MRI data is complex and benefits from concurrent analysis of multiple kinetic models and parameters. Few software tools are currently available that specifically focuses on DCE-MRI analysis with multiple kinetic models. Here, we developed ROCKETSHIP, an open-source, flexible and modular software for DCE-MRI analysis. ROCKETSHIP incorporates analyses with multiple kinetic models, including data-driven nested model analysis. RESULTS ROCKETSHIP was implemented using the MATLAB programming language. Robustness of the software to provide reliable fits using multiple kinetic models is demonstrated using simulated data. Simulations also demonstrate the utility of the data-driven nested model analysis. Applicability of ROCKETSHIP for both preclinical and clinical studies is shown using DCE-MRI studies of the human brain and a murine tumor model. CONCLUSION A DCE-MRI software suite was implemented and tested using simulations. Its applicability to both preclinical and clinical datasets is shown. ROCKETSHIP was designed to be easily accessible for the beginner, but flexible enough for changes or additions to be made by the advanced user as well. The availability of a flexible analysis tool will aid future studies using DCE-MRI. A public release of ROCKETSHIP is available at https://github.com/petmri/ROCKETSHIP .
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Affiliation(s)
- Samuel R Barnes
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, 91125, USA.
| | - Thomas S C Ng
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, 91125, USA. .,Department of Medicine, University of California, Irvine Medical Center, Orange, CA, USA.
| | - Naomi Santa-Maria
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, 91125, USA.
| | - Axel Montagne
- Zilkha Neurogenetic Institute and Department of Physiology and Biophysics, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA.
| | - Berislav V Zlokovic
- Zilkha Neurogenetic Institute and Department of Physiology and Biophysics, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA.
| | - Russell E Jacobs
- Division of Biology and Biological Engineering, California Institute of Technology, Pasadena, CA, 91125, USA.
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Zarinabad N, Chiribiri A, Hautvast GLTF, Breeuwer M, Nagel E. Influence of spatial resolution on the accuracy of quantitative myocardial perfusion in first pass stress perfusion CMR. Magn Reson Med 2014; 73:1623-31. [PMID: 24844947 PMCID: PMC4407925 DOI: 10.1002/mrm.25249] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2013] [Revised: 02/20/2014] [Accepted: 03/20/2014] [Indexed: 12/12/2022]
Abstract
PURPOSE High-resolution myocardial perfusion analysis allows for preserving spatial information with excellent sensitivity for subendocardial ischemia detection. However, it suffers from low signal-to-noise ratio. Commonly, spatial averaging is used to increase signal-to-noise ratio. This bears the risk of losing information about the extent, localization and transmurality of ischemia. This study investigates spatial-averaging effects on perfusion-estimates accuracy. METHODS Perfusion data were obtained from patients and healthy volunteers. Spatial averaging was performed on voxel-based data in transmural and angular direction to reduce resolution to 50, 20, and 10% of its original value. Fit quality assessment method is used to measure the fraction of modeled information and remaining unmodeled information in the residuals. RESULTS Fraction of modeled information decreased in patients as resolution reduced. This decrease was more evident for Fermi and exponential in transmural direction. Fermi and exponential showed significant difference at 50% resolution (Fermi P < 0.001, exponential P =0.0014). No significant differences were observed for autoregressive-moving-average model (P = 0.081). At full resolution, autoregressive-moving-average model has the lowest fraction of residual information (0.3). Differences were observed comparing ischemic regions perfusion-estimates coefficient of variation at transmural and angular direction. CONCLUSION Angular averaging preserves more information compared to transmural averaging. Reducing resolution level below 50% at transmural and 20% at angular direction results in losing information about transmural perfusion differences. Maximum voxel size of 2 × 2 mm(2) is necessary to avoid loss of physiological information due to spatial averaging.
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Affiliation(s)
- Niloufar Zarinabad
- Division of Imaging Sciences and Biomedical Engineering, King's College London BHF Centre of Excellence, NIHR Biomedical Research Centre and Wellcome Trust and EPSRC Medical Engineering Centre at Guy's and St. Thomas' NHS Foundation Trust, The Rayne Institute, St. Thomas' Hospital, London, SE1 7EH, UK
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Jackson A, Li KL, Zhu X. Semi-quantitative parameter analysis of DCE-MRI revisited: monte-carlo simulation, clinical comparisons, and clinical validation of measurement errors in patients with type 2 neurofibromatosis. PLoS One 2014; 9:e90300. [PMID: 24594707 PMCID: PMC3942428 DOI: 10.1371/journal.pone.0090300] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2013] [Accepted: 02/03/2014] [Indexed: 01/22/2023] Open
Abstract
PURPOSE To compare semi-quantitative (SQ) and pharmacokinetic (PK) parameters for analysis of dynamic contrast enhanced MR data (DCE-MRI) and investigate error-propagation in SQ parameters. METHODS Clinical data was collected from five patients with type 2-neurofibromatosis (NF2) receiving anti-angiogenic therapy for rapidly growing vestibular schwannoma (VS). There were 7 VS and 5 meningiomas. Patients were scanned prior to therapy and at days 3 and 90 of treatment. Data was collected using a dual injection technique to permit direct comparison of SQ and PK parameters. Monte Carlo modeling was performed to assess potential measurement errors in SQ parameters in persistent, washout, and weakly enhancing tissues. The simulation predictions for five semi-quantitative parameters were tested using the clinical DCE-MRI data. RESULTS In VS, SQ parameters and Ktrans showed close correlation and demonstrated similar therapy induced reductions. In meningioma, only the denoised Signal Enhancement Ratio (Rse1/se2(DN)) showed a significant therapy induced reduction (p<0.05). Simulation demonstrated: 1) Precision of SQ metrics normalized to the pre-contrast-baseline values (MSErel and ∑MSErel) is improved by use of an averaged value from multiple baseline scans; 2) signal enhancement ratio Rmse1/mse2 shows considerable susceptibility to noise; 3) removal of outlier values to produce a new parameter, Rmse1/mse2(DN), improves precision and sensitivity to therapy induced changes. Direct comparison of in-vivo analysis with Monte Carlo simulation supported the simulation predicted error distributions of semi-quantitative metrics. CONCLUSION PK and SQ parameters showed similar sensitivity to anti-angiogenic therapy induced changes in VS. Modeling studies confirmed the benefits of averaging baseline signal from multiple images for normalized SQ metrics and demonstrated poor noise tolerance in the widely used signal enhancement ratio, which is corrected by removal of outlier values.
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Affiliation(s)
- Alan Jackson
- Wolfson Molecular Imaging Centre, The University of Manchester, Manchester, United Kingdom
| | - Ka-Loh Li
- Wolfson Molecular Imaging Centre, The University of Manchester, Manchester, United Kingdom
| | - Xiaoping Zhu
- Wolfson Molecular Imaging Centre, The University of Manchester, Manchester, United Kingdom
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Cuenod C, Balvay D. Perfusion and vascular permeability: Basic concepts and measurement in DCE-CT and DCE-MRI. Diagn Interv Imaging 2013; 94:1187-204. [DOI: 10.1016/j.diii.2013.10.010] [Citation(s) in RCA: 138] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Hamy V, Dikaios N, Punwani S, Melbourne A, Latifoltojar A, Makanyanga J, Chouhan M, Helbren E, Menys A, Taylor S, Atkinson D. Respiratory motion correction in dynamic MRI using robust data decomposition registration - application to DCE-MRI. Med Image Anal 2013; 18:301-13. [PMID: 24322575 DOI: 10.1016/j.media.2013.10.016] [Citation(s) in RCA: 81] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2013] [Revised: 10/22/2013] [Accepted: 10/31/2013] [Indexed: 12/25/2022]
Abstract
Motion correction in Dynamic Contrast Enhanced (DCE-) MRI is challenging because rapid intensity changes can compromise common (intensity based) registration algorithms. In this study we introduce a novel registration technique based on robust principal component analysis (RPCA) to decompose a given time-series into a low rank and a sparse component. This allows robust separation of motion components that can be registered, from intensity variations that are left unchanged. This Robust Data Decomposition Registration (RDDR) is demonstrated on both simulated and a wide range of clinical data. Robustness to different types of motion and breathing choices during acquisition is demonstrated for a variety of imaged organs including liver, small bowel and prostate. The analysis of clinically relevant regions of interest showed both a decrease of error (15-62% reduction following registration) in tissue time-intensity curves and improved areas under the curve (AUC60) at early enhancement.
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Affiliation(s)
- Valentin Hamy
- Centre for Medical Imaging, University College London, 250 Euston Road, NW1 2PG London, UK.
| | - Nikolaos Dikaios
- Centre for Medical Imaging, University College London, 250 Euston Road, NW1 2PG London, UK
| | - Shonit Punwani
- Centre for Medical Imaging, University College London, 250 Euston Road, NW1 2PG London, UK
| | - Andrew Melbourne
- Centre for Medical Image Computing, University College London, Gower Street, WC1E 6BT London, UK
| | - Arash Latifoltojar
- Centre for Medical Imaging, University College London, 250 Euston Road, NW1 2PG London, UK
| | - Jesica Makanyanga
- Centre for Medical Imaging, University College London, 250 Euston Road, NW1 2PG London, UK
| | - Manil Chouhan
- Centre for Medical Imaging, University College London, 250 Euston Road, NW1 2PG London, UK
| | - Emma Helbren
- Centre for Medical Imaging, University College London, 250 Euston Road, NW1 2PG London, UK
| | - Alex Menys
- Centre for Medical Imaging, University College London, 250 Euston Road, NW1 2PG London, UK
| | - Stuart Taylor
- Centre for Medical Imaging, University College London, 250 Euston Road, NW1 2PG London, UK
| | - David Atkinson
- Centre for Medical Imaging, University College London, 250 Euston Road, NW1 2PG London, UK
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Luypaert R, Ingrisch M, Sourbron S, de Mey J. The Akaike information criterion in DCE-MRI: Does it improve the haemodynamic parameter estimates? Phys Med Biol 2012; 57:3609-28. [DOI: 10.1088/0031-9155/57/11/3609] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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17
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Leach MO, Morgan B, Tofts PS, Buckley DL, Huang W, Horsfield MA, Chenevert TL, Collins DJ, Jackson A, Lomas D, Whitcher B, Clarke L, Plummer R, Judson I, Jones R, Alonzi R, Brunner T, Koh DM, Murphy P, Waterton JC, Parker G, Graves MJ, Scheenen TWJ, Redpath TW, Orton M, Karczmar G, Huisman H, Barentsz J, Padhani A. Imaging vascular function for early stage clinical trials using dynamic contrast-enhanced magnetic resonance imaging. Eur Radiol 2012; 22:1451-64. [PMID: 22562143 DOI: 10.1007/s00330-012-2446-x] [Citation(s) in RCA: 124] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2011] [Revised: 02/23/2012] [Accepted: 02/28/2012] [Indexed: 12/11/2022]
Abstract
Many therapeutic approaches to cancer affect the tumour vasculature, either indirectly or as a direct target. Dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) has become an important means of investigating this action, both pre-clinically and in early stage clinical trials. For such trials, it is essential that the measurement process (i.e. image acquisition and analysis) can be performed effectively and with consistency among contributing centres. As the technique continues to develop in order to provide potential improvements in sensitivity and physiological relevance, there is considerable scope for between-centre variation in techniques. A workshop was convened by the Imaging Committee of the Experimental Cancer Medicine Centres (ECMC) to review the current status of DCE-MRI and to provide recommendations on how the technique can best be used for early stage trials. This review and the consequent recommendations are summarised here. Key Points • Tumour vascular function is key to tumour development and treatment • Dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) can assess tumour vascular function • Thus DCE-MRI with pharmacokinetic models can assess novel treatments • Many recent developments are advancing the accuracy of and information from DCE-MRI • Establishing common methodology across multiple centres is challenging and requires accepted guidelines.
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Affiliation(s)
- M O Leach
- Cancer Research UK and EPSRC Cancer Imaging Centre, Institute of Cancer Research & Royal Marsden NHS Foundation Trust, Downs Road, Sutton, Surrey, SM2, 5PT, UK.
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18
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Current status and guidelines for the assessment of tumour vascular support with dynamic contrast-enhanced computed tomography. Eur Radiol 2012; 22:1430-41. [PMID: 22367468 DOI: 10.1007/s00330-012-2379-4] [Citation(s) in RCA: 136] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2011] [Revised: 11/23/2011] [Accepted: 11/24/2011] [Indexed: 12/13/2022]
Abstract
Dynamic contrast-enhanced computed tomography (DCE-CT) assesses the vascular support of tumours through analysis of temporal changes in attenuation in blood vessels and tissues during a rapid series of images acquired with intravenous administration of iodinated contrast material. Commercial software for DCE-CT analysis allows pixel-by-pixel calculation of a range of validated physiological parameters and depiction as parametric maps. Clinical studies support the use of DCE-CT parameters as surrogates for physiological and molecular processes underlying tumour angiogenesis. DCE-CT has been used to provide biomarkers of drug action in early phase trials for the treatment of a range of cancers. DCE-CT can be appended to current imaging assessments of tumour response with the benefits of wide availability and low cost. This paper sets out guidelines for the use of DCE-CT in assessing tumour vascular support that were developed using a Delphi process. Recommendations encompass CT system requirements and quality assurance, radiation dosimetry, patient preparation, administration of contrast material, CT acquisition parameters, terminology and units, data processing and reporting. DCE-CT has reached technical maturity for use in therapeutic trials in oncology. The development of these consensus guidelines may promote broader application of DCE-CT for the evaluation of tumour vascularity. Key Points • DCE-CT can robustly assess tumour vascular support • DCE-CT has reached technical maturity for use in therapeutic trials in oncology • This paper presents consensus guidelines for using DCE-CT in assessing tumour vascularity.
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19
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Quantitative dynamic contrast-enhanced MR imaging analysis of complex adnexal masses: a preliminary study. Eur Radiol 2011; 22:738-45. [DOI: 10.1007/s00330-011-2329-6] [Citation(s) in RCA: 77] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2011] [Revised: 09/04/2011] [Accepted: 09/20/2011] [Indexed: 11/25/2022]
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20
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Melbourne A, Hipwell J, Modat M, Mertzanidou T, Huisman H, Ourselin S, Hawkes DJ. The effect of motion correction on pharmacokinetic parameter estimation in dynamic-contrast-enhanced MRI. Phys Med Biol 2011; 56:7693-708. [PMID: 22086390 DOI: 10.1088/0031-9155/56/24/001] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
A dynamic-contrast-enhanced magnetic resonance imaging (DCE-MRI) dataset consists of many imaging frames, often acquired both before and after contrast injection. Due to the length of time spent acquiring images, patient motion is likely and image re-alignment or registration is required before further analysis such as pharmacokinetic model fitting. Non-rigid image registration procedures may be used to correct motion artefacts; however, a careful choice of registration strategy is required to reduce misregistration artefacts associated with enhancing features. This work investigates the effect of registration on the results of model-fitting algorithms for 52 DCE-MR mammography cases for 14 patients. Results are divided into two sections: a comparison of registration strategies in which a DCE-MRI-specific algorithm is preferred in 50% of cases, followed by an investigation of parameter changes with known applied deformations, inspecting the effect of magnitude and timing of motion artefacts. Increased motion magnitude correlates with increased model-fit residual and is seen to have a strong influence on the visibility of strongly enhancing features. Motion artefacts in images close to the contrast agent arrival have a disproportionate effect on discrepancies in parameter estimation. The choice of algorithm, magnitude of motion and timing of the motion are each shown to influence estimated pharmacokinetic parameters even when motion magnitude is small.
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Affiliation(s)
- A Melbourne
- Centre for Medical Image Computing, University College London, Gower Street, London WC1E 6BT, UK.
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21
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de Bazelaire C, Calmon R, Thomassin I, Brunon C, Hamy AS, Fournier L, Balvay D, Espié M, Siauve N, Clément O, de Kerviler E, Cuénod CA. Accuracy of perfusion MRI with high spatial but low temporal resolution to assess invasive breast cancer response to neoadjuvant chemotherapy: a retrospective study. BMC Cancer 2011; 11:361. [PMID: 21854572 PMCID: PMC3173447 DOI: 10.1186/1471-2407-11-361] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2011] [Accepted: 08/19/2011] [Indexed: 11/16/2022] Open
Abstract
Background To illustrate that Breast-MRI performed in high spatial resolution and low temporal resolution (1 minute) allows the measurement of kinetic parameters that can assess the final pathologic response to neoadjuvant chemotherapy in breast cancer. Methods Breast-MRI was performed in 24 women before and after treatment. Eight series of 1.11 minute-duration were acquired with a sub-millimeter spatial resolution. Transfer constant (Ktrans) and leakage space (Ve) were calculated using measured and theoretical Arterial Input Function (AIF). Changes in kinetic parameters after treatment obtained with both AIFs were compared with final pathologic response graded in non-responder (< 50% therapeutic effect), partial-responder (> 50% therapeutic effect) and complete responder. Accuracies to identify non-responders were compared with receiver operating characteristic curves. Results With measured-AIF, changes in kinetic parameters measured after treatment were in agreement with the final pathological response. Changes in Ve and Ktrans were significantly different between non-(N = 11), partial-(N = 7), and complete (N = 6) responders, (P = 0.0092 and P = 0.0398 respectively). A decrease in Ve of more than -72% and more than -84% for Ktrans resulted in 73% sensitivity for identifying non-responders (specificity 92% and 77% respectively). A decrease in Ve of more than -87% helped to identify complete responders (Sensitivity 89%, Specificity 83%). With theoretical-AIF, changes in kinetic parameters had lower accuracy. Conclusion There is a good agreement between pathological findings and changes in kinetic parameters obtained with breast-MRI in high spatial and low temporal resolution when measured-AIF is used. Further studies are necessary to confirm whether MRI contrast kinetic parameters can be used earlier as a response predictor to neoadjuvant chemotherapy.
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Affiliation(s)
- Cédric de Bazelaire
- Radiologie, Hôpital Saint-Louis - Inserm U728 - Université Paris VII, 1 Avenue Claude Vellefaux, Paris, 75010, France.
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22
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Mulé S, Kachenoura N, Lucidarme O, De Oliveira A, Pellot-Barakat C, Herment A, Frouin F. An automatic respiratory gating method for the improvement of microcirculation evaluation: application to contrast-enhanced ultrasound studies of focal liver lesions. Phys Med Biol 2011; 56:5153-65. [PMID: 21775793 DOI: 10.1088/0031-9155/56/16/005] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Contrast-enhanced ultrasound (CEUS), with the recent development of both contrast-specific imaging modalities and microbubble-based contrast agents, allows noninvasive quantification of microcirculation in vivo. Nevertheless, functional parameters obtained by modeling contrast uptake kinetics could be impaired by respiratory motion. Accordingly, we developed an automatic respiratory gating method and tested it on 35 CEUS hepatic datasets with focal lesions. Each dataset included fundamental mode and cadence contrast pulse sequencing (CPS) mode sequences acquired simultaneously. The developed method consisted in (1) the estimation of the respiratory kinetics as a linear combination of the first components provided by a principal components analysis constrained by a prior knowledge on the respiratory rate in the frequency domain, (2) the automated generation of two respiratory-gated subsequences from the CPS mode sequence by detecting end-of-inspiration and end-of-expiration phases from the respiratory kinetics. The fundamental mode enabled a more reliable estimation of the respiratory kinetics than the CPS mode. The k-means algorithm was applied on both the original CPS mode sequences and the respiratory-gated subsequences resulting in clustering maps and associated mean kinetics. Our respiratory gating process allowed better superimposition of manually drawn lesion contours on k-means clustering maps as well as substantial improvement of the quality of contrast uptake kinetics. While the quality of maps and kinetics was satisfactory in only 11/35 datasets before gating, it was satisfactory in 34/35 datasets after gating. Moreover, noise amplitude estimated within the delineated lesions was reduced from 62 ± 21 to 40 ± 10 (p < 0.01) after gating. These findings were supported by the low residual horizontal (0.44 ± 0.29 mm) and vertical (0.15 ± 0.16 mm) shifts found during manual motion correction of each respiratory-gated subsequence. The developed technique could be used as a basis for accurate quantification of perfusion parameters for the evaluation and follow-up of patients under antiangiogenic therapies.
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Affiliation(s)
- S Mulé
- INSERM UMR-S 678, 75634 Paris Cedex 13, France.
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23
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Kachenoura N, Cluzel P, Frouin F, Toledano D, Grenier P, Cuenod CA, Balvay D. Evaluation of an edge-based registration method: application to magnetic resonance first-pass myocardial perfusion data. Magn Reson Imaging 2011; 29:853-60. [DOI: 10.1016/j.mri.2011.02.020] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2010] [Revised: 02/25/2011] [Accepted: 02/26/2011] [Indexed: 11/26/2022]
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Sourbron SP, Buckley DL. On the scope and interpretation of the Tofts models for DCE-MRI. Magn Reson Med 2011; 66:735-45. [PMID: 21384424 DOI: 10.1002/mrm.22861] [Citation(s) in RCA: 264] [Impact Index Per Article: 20.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2010] [Revised: 12/13/2010] [Accepted: 01/10/2011] [Indexed: 11/06/2022]
Abstract
The Tofts model (TM) and extended Tofts model (ETM) have become a standard for the analysis of dynamic contrast-enhanced MRI. In this study, a mathematical analysis is used to identify exactly in which tissue types the Tofts models may be applied. The results show that the TM is accurate if and only if the tissue is weakly vascularised (small blood volume). The ETM is additionally accurate in highly perfused tissues (high blood flow). In tissues that are highly vascularised, or where tracer exchange is very fast or very slow, TM and ETM accurately fit the data but lead to a misinterpretation of the parameters. In tissue types with intermediate vascularity, perfusion and tracer exchange, neither model offers a good fit to the tissue concentrations. A good fit can be obtained with a measured input function by reducing the temporal resolution, but this does not improve the accuracy of the parameters. In conclusion, the Tofts models only produce reliable parameter values if the tissue is weakly vascularized (TM or ETM) or highly perfused (ETM). Without prior knowledge that at least one of these constraints is fulfilled, the physiological interpretation of the values produced by the Tofts models is unclear.
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Affiliation(s)
- Steven P Sourbron
- Division of Medical Physics, University of Leeds, Leeds, United Kingdom.
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25
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Balvay D, Kachenoura N, Espinoza S, Thomassin-Naggara I, Fournier LS, Clement O, Cuenod CA. Signal-to-Noise Ratio Improvement in Dynamic Contrast-enhanced CT and MR Imaging with Automated Principal Component Analysis Filtering. Radiology 2011; 258:435-45. [DOI: 10.1148/radiol.10100231] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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26
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Bains LJ, McGrath DM, Naish JH, Cheung S, Watson Y, Taylor MB, Logue JP, Parker GJM, Waterton JC, Buckley DL. Tracer kinetic analysis of dynamic contrast-enhanced MRI and CT bladder cancer data: A preliminary comparison to assess the magnitude of water exchange effects. Magn Reson Med 2011; 64:595-603. [PMID: 20665802 DOI: 10.1002/mrm.22430] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The purpose of this study was to determine the impact of water exchange on tracer kinetic parameter estimates derived from T(1)-weighted dynamic contrast-enhanced (DCE)-MRI data using a direct quantitative comparison with DCE-CT. Data were acquired from 12 patients with bladder cancer who underwent DCE-CT followed by DCE-MRI within a week. A two-compartment tracer kinetic model was fitted to the CT data, and two versions of the same model with modifications to account for the fast exchange and no exchange limits of water exchange were fitted to the MR data. The two-compartment tracer kinetic model provided estimates of the fractional plasma volume (v(p)), the extravascular extracellular space fraction (v(e)), plasma perfusion (F(p)), and the microvascular permeability surface area product. Our findings suggest that DCE-CT is an appropriate reference for DCE-MRI in bladder cancers as the only significant difference found between CT and MR parameter estimates were the no exchange limit estimates of v(p) (P = 0.002). These results suggest that although water exchange between the intracellular and extravascular-extracellular space has a negligible effect on DCE-MRI, vascular-extravascular-extracellular space water exchange may be more important.
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Affiliation(s)
- Lauren J Bains
- Imaging Science and Biomedical Engineering, School of Cancer and Imaging Sciences, University Manchester, Manchester, UK
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27
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Luypaert R, Sourbron S, Makkat S, de Mey J. Error estimation for perfusion parameters obtained using the two-compartment exchange model in dynamic contrast-enhanced MRI: a simulation study. Phys Med Biol 2010; 55:6431-43. [DOI: 10.1088/0031-9155/55/21/006] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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28
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Donaldson SB, West CML, Davidson SE, Carrington BM, Hutchison G, Jones AP, Sourbron SP, Buckley DL. A comparison of tracer kinetic models for T1-weighted dynamic contrast-enhanced MRI: application in carcinoma of the cervix. Magn Reson Med 2010; 63:691-700. [PMID: 20187179 DOI: 10.1002/mrm.22217] [Citation(s) in RCA: 78] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The Tofts tracer kinetic models are often used to analyze dynamic contrast-enhanced MRI data. They are derived from a general two-compartment exchange model (2CXM) but assume negligible plasma mean transit time. The 2CXM estimates tissue plasma perfusion and capillary permeability-surface area; the Tofts models estimate the transfer constant K(trans), which reflects a combination of these two parameters. The aims of this study were to compare the 2CXM and Tofts models and report microvascular parameters in patients with cervical cancer. Thirty patients were scanned pretreatment using a dynamic contrast-enhanced MRI protocol with a 3 sec temporal resolution and a total scan duration of 4 min. Whole-tumor parameters were estimated with both models. The 2CXM provided superior fits to the data for all patients (all 30 P values < 0.005), and significantly different parameter estimates were obtained (P < 0.01). K(trans) (mean = 0.35 +/- 0.26 min(-1)) did not equal absolute values of tissue plasma perfusion (mean = 0.65 +/- 0.56 mL/mL/min) or permeability-surface area (mean = 0.14 +/- 0.09 mL/mL/min) but correlated strongly with tissue plasma perfusion (r = 0.944; P = 0.01). Average plasma mean transit time, calculated with the 2CXM, was 22 +/- 16 sec, suggesting the assumption of negligible plasma mean transit time is not appropriate in this dataset and the 2CXM is better suited for its analysis than the Tofts models. The results demonstrate the importance of selecting an appropriate tracer kinetic model in dynamic contrast-enhanced MRI.
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Affiliation(s)
- Stephanie B Donaldson
- Imaging Science and Biomedical Engineering, University of Manchester, Manchester, United Kingdom
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29
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Sourbron S. Technical aspects of MR perfusion. Eur J Radiol 2010; 76:304-13. [PMID: 20363574 DOI: 10.1016/j.ejrad.2010.02.017] [Citation(s) in RCA: 91] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2010] [Accepted: 02/23/2010] [Indexed: 12/15/2022]
Abstract
The most common methods for measuring perfusion with MRI are arterial spin labelling (ASL), dynamic susceptibility contrast (DSC-MRI), and T(1)-weighted dynamic contrast enhancement (DCE-MRI). This review focuses on the latter approach, which is by far the most common in the body and produces measures of capillary permeability as well. The aim is to present a concise but complete overview of the technical issues involved in DCE-MRI data acquisition and analysis. For details the reader is referred to the references. The presentation of the topic is essentially generic and focuses on technical aspects that are common to all DCE-MRI measurements. For organ-specific problems and illustrations, we refer to the other papers in this issue. In Section 1 "Theory" the basic quantities are defined, and the physical mechanisms are presented that provide a relation between the hemodynamic parameters and the DCE-MRI signal. Section 2 "Data acquisition" discusses the issues involved in the design of an optimal measurement protocol. Section 3 "Data analysis" summarizes the steps that need to be taken to determine the hemodynamic parameters from the measured data.
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Affiliation(s)
- Steven Sourbron
- Division of Medical Physics, University of Leeds, Worsley Building, Clarendon Way, LS2 9JT Leeds, UK.
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30
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Guibal A, Taillade L, Mulé S, Comperat E, Badachi Y, Golmard JL, Le Guillou-Buffello D, Rixe O, Bridal SL, Lucidarme O. Noninvasive Contrast-enhanced US Quantitative Assessment of Tumor Microcirculation in a Murine Model: Effect of Discontinuing Anti-VEGF Therapy. Radiology 2010; 254:420-9. [DOI: 10.1148/radiol.09090728] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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31
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Dynamic contrast-enhanced MR imaging to assess physiologic variations of myometrial perfusion. Eur Radiol 2009; 20:984-94. [DOI: 10.1007/s00330-009-1621-1] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2009] [Revised: 07/10/2009] [Accepted: 07/30/2009] [Indexed: 10/20/2022]
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32
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Balvay D, Troprès I, Billet R, Joubert A, Péoc'h M, Cuenod CA, Le Duc G. Mapping the Zonal Organization of Tumor Perfusion and Permeability in a Rat Glioma Model by Using Dynamic Contrast-enhanced Synchrotron Radiation CT. Radiology 2009; 250:692-702. [DOI: 10.1148/radiol.2501071929] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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33
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Li KL, Henry RG, Wilmes LJ, Gibbs J, Zhu X, Lu Y, Hylton NM. Kinetic assessment of breast tumors using high spatial resolution signal enhancement ratio (SER) imaging. Magn Reson Med 2007; 58:572-81. [PMID: 17685424 PMCID: PMC4508009 DOI: 10.1002/mrm.21361] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The goal of this study was to investigate the relationship between an empirical contrast kinetic parameter, the signal enhancement ratio (SER), for three-timepoint, high spatial resolution contrast-enhanced (CE) MRI, and a commonly analyzed pharmacokinetic parameter, kep, using dynamic high temporal resolution CE-MRI. Computer simulation was performed to investigate: 1) the relationship between the SER and the contrast agent concentration ratio (CACR) of two postcontrast timepoints (tp1 and tp2); 2) the relationship between the CACR and the redistribution rate constant (kep) based on a two-compartment pharmacokinetic model; and 3) the sensitivity of the relationship between the SER and kep to native tissue T1 relaxation time, T10, and to errors in an assumed vascular input function. The relationship between SER and kep was verified experimentally using a mouse model of breast cancer. The results showed that a monotonic mathematical relationship between SER and kep could be established if the acquisition parameters and the two postinjection timepoints of SER, tp1, tp2, were appropriately chosen. The in vivo study demonstrated a close correlation between SER and kep on a pixel-by-pixel basis (Spearman rank correlation coefficient=0.87+/-0.03). The SER is easy to calculate and may have a unique role in breast tissue characterization.
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Affiliation(s)
- Ka-Loh Li
- Department of Radiology, University of California San Francisco, San Francisco, California 94107-0946, USA.
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