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https://www.readbyqxmd.com/read/28210799/dynamic-contrast-enhanced-mr-imaging-pharmacokinetic-parameters-as-predictors-of-treatment-response-of-brain-metastases-in-patients-with-lung-cancer
#1
Grégory Kuchcinski, Emilie Le Rhun, Alexis B Cortot, Elodie Drumez, Romain Duhal, Maxime Lalisse, Julien Dumont, Renaud Lopes, Jean-Pierre Pruvo, Xavier Leclerc, Christine Delmaire
OBJECTIVES: To determine the diagnostic accuracy of pharmacokinetic parameters measured by dynamic contrast-enhanced (DCE) magnetic resonance imaging (MRI) in predicting the response of brain metastases to antineoplastic therapy in patients with lung cancer. METHODS: Forty-four consecutive patients with lung cancer, harbouring 123 newly diagnosed brain metastases prospectively underwent conventional 3-T MRI at baseline (within 1 month before treatment), during the early (7-10 weeks) and midterm (5-7 months) post-treatment period...
February 16, 2017: European Radiology
https://www.readbyqxmd.com/read/28207745/evolution-of-blood-brain-barrier-permeability-after-acute-ischemic-stroke
#2
Zamir Merali, Kun Huang, David Mikulis, Frank Silver, Andrea Kassner
The dynamics of BBB permeability after AIS in humans are not well understood. In the present study we measured the evolution of BBB permeability after AIS in humans using MRI. Patients presenting to our institution with a diagnosis of AIS underwent a single dynamic contrast-enhanced MRI (DCE-MRI) sequence to measure BBB permeability during their initial workup. Forty-two patients were included in the final analysis. The patient sample underwent DCE-MRI at a mean time of 23.8hrs after the onset of AIS symptoms (range: 1...
2017: PloS One
https://www.readbyqxmd.com/read/28195664/an-adaptive-model-for-rapid-and-direct-estimation-of-extravascular-extracellular-space-in-dynamic-contrast-enhanced-mri-studies
#3
Azimeh N V Dehkordi, Alireza Kamali-Asl, James R Ewing, Ning Wen, Indrin J Chetty, Hassan Bagher-Ebadian
Extravascular extracellular space (ve ) is a key parameter to characterize the tissue of cerebral tumors. This study introduces an artificial neural network (ANN) as a fast, direct, and accurate estimator of ve from a time trace of the longitudinal relaxation rate, ΔR1 (R1  = 1/T1 ), in DCE-MRI studies. Using the extended Tofts equation, a set of ΔR1 profiles was simulated in the presence of eight different signal to noise ratios. A set of gain- and noise-insensitive features was generated from the simulated ΔR1 profiles and used as the ANN training set...
February 14, 2017: NMR in Biomedicine
https://www.readbyqxmd.com/read/28192761/a-comparison-of-bayesian-and-non-linear-regression-methods-for-robust-estimation-of-pharmacokinetics-in-dce-mri-and-how-it-affects-cancer-diagnosis
#4
Nikolaos Dikaios, David Atkinson, Chiara Tudisca, Pierpaolo Purpura, Martin Forster, Hashim Ahmed, Timothy Beale, Mark Emberton, Shonit Punwani
The aim of this work is to compare Bayesian Inference for nonlinear models with commonly used traditional non-linear regression (NR) algorithms for estimating tracer kinetics in Dynamic Contrast Enhanced Magnetic Resonance Imaging (DCE-MRI). The algorithms are compared in terms of accuracy, and reproducibility under different initialization settings. Further it is investigated how a more robust estimation of tracer kinetics affects cancer diagnosis. The derived tracer kinetics from the Bayesian algorithm were validated against traditional NR algorithms (i...
February 5, 2017: Computerized Medical Imaging and Graphics: the Official Journal of the Computerized Medical Imaging Society
https://www.readbyqxmd.com/read/28177554/identifying-relations-between-imaging-phenotypes-and-molecular-subtypes-of-breast-cancer-model-discovery-and-external-validation
#5
Jia Wu, Xiaoli Sun, Jeff Wang, Yi Cui, Fumi Kato, Hiroki Shirato, Debra M Ikeda, Ruijiang Li
PURPOSE: To determine whether dynamic contrast enhancement magnetic resonance imaging (DCE-MRI) characteristics of the breast tumor and background parenchyma can distinguish molecular subtypes (ie, luminal A/B or basal) of breast cancer. MATERIALS AND METHODS: In all, 84 patients from one institution and 126 patients from The Cancer Genome Atlas (TCGA) were used for discovery and external validation, respectively. Thirty-five quantitative image features were extracted from DCE-MRI (1...
February 8, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28166261/radiomic-analysis-reveals-dce-mri-features-for-prediction-of-molecular-subtypes-of-breast-cancer
#6
Ming Fan, Hui Li, Shijian Wang, Bin Zheng, Juan Zhang, Lihua Li
The purpose of this study was to investigate the role of features derived from breast dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) and to incorporated clinical information to predict the molecular subtypes of breast cancer. In particular, 60 breast cancers with the following four molecular subtypes were analyzed: luminal A, luminal B, human epidermal growth factor receptor-2 (HER2)-over-expressing and basal-like. The breast region was segmented and the suspicious tumor was depicted on sequentially scanned MR images from each case...
2017: PloS One
https://www.readbyqxmd.com/read/28162875/diagnosis-of-spinal-lesions-using-heuristic-and-pharmacokinetic-parameters-measured-by-dynamic-contrast-enhanced-mri
#7
Ning Lang, Huishu Yuan, Hon J Yu, Min-Ying Su
RATIONALE AND OBJECTIVES: This study aimed to evaluate the diagnostic performance of dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) in differentiation of four spinal lesions by using heuristic and pharmacokinetic parameters analyzed from DCE signal intensity time course. MATERIALS AND METHODS: DCE-MRI of 62 subjects with confirmed myeloma (n = 9), metastatic cancer (n = 22), lymphoma (n = 7), and inflammatory tuberculosis (TB) (n = 24) in the spine were analyzed retrospectively...
February 2, 2017: Academic Radiology
https://www.readbyqxmd.com/read/28160347/measuring-subtle-leakage-of-the-blood-brain-barrier-in-cerebrovascular-disease-with-dce-mri-test-retest-reproducibility-and-its-influencing-factors
#8
Sau May Wong, Jacobus F A Jansen, C Eleana Zhang, Julie Staals, Paul A M Hofman, Robert J van Oostenbrugge, Cécile R L P N Jeukens, Walter H Backes
PURPOSE: Increased blood-brain barrier (BBB) permeability has been shown to play a significant role in the pathophysiology of cerebrovascular disease and it may provide an early functional marker of progression or treatment effects. The aim of the study was to investigate the test-retest reproducibility and influencing factors of dynamic contrast-enhanced (DCE) magnetic resonance imaging (MRI) in measuring subtle leakage in patients with cerebrovascular disease. MATERIAL AND METHODS: DCE-MRI (3T) was performed on two separate days in 16 patients (age 66 ± 9 years) with cerebrovascular disease, prospectively...
February 3, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28153658/first-trimester-alcohol-exposure-alters-placental-perfusion-and-fetal-oxygen-availability-affecting-fetal-growth-and-development-in-a-non-human-primate-model
#9
Jamie O Lo, Matthias C Schabel, Victoria H J Roberts, Xiaojie Wang, Katherine S Lewandowski, Kathleen A Grant, Antonio E Frias, Christopher D Kroenke
BACKGROUND: Prenatal alcohol exposure leads to impaired fetal growth, brain development, and stillbirth. Placental impairment likely contributes to these adverse outcomes, but the mechanisms and specific vasoactive effects of alcohol that links altered placental function to impaired fetal development remain areas of active research. OBJECTIVE: Recently, we developed magnetic resonance imaging techniques in nonhuman primates to characterize placental blood oxygenation through measurements of T2* and perfusion using dynamic contrast-enhanced magnetic resonance imaging...
January 30, 2017: American Journal of Obstetrics and Gynecology
https://www.readbyqxmd.com/read/28152250/intravoxel-incoherent-motion-mri-in-the-brain-impact-of-the-fitting-model-on-perfusion-fraction-and-lesion-differentiability
#10
Vera C Keil, Burkhard Mädler, Gerrit H Gielen, Bogdan Pintea, Kanishka Hiththetiya, Alisa R Gaspranova, Jürgen Gieseke, Matthias Simon, Hans H Schild, Dariusch R Hadizadeh
PURPOSE: To investigate the effect of the choice of the curve-fitting model on the perfusion fraction (fIVIM ) with regard to tissue type characterization, correlation with microvascular anatomy, and dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) parameters. Several curve-fitting models coexist in intravoxel incoherent motion (IVIM) MRI to derive the (fIVIM ). MATERIALS AND METHODS: In all, 29 patients with brain lesions (12 gliomas, 11 meningiomas, three metastases, two gliotic scars, one multiple sclerosis) underwent IVIM-MRI (32 b-values, 0 to 2000 s/mm(2) ) at 3T...
February 2, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28152245/vessel-wall-and-adventitial-dce-mri-parameters-demonstrate-similar-correlations-with-carotid-plaque-microvasculature-on-histology
#11
Raf H M van Hoof, Stefan A Vöö, Judith C Sluimer, Nicky J A Wijnen, Evelien Hermeling, Floris H B M Schreuder, Martine T B Truijman, Jack P M Cleutjens, Mat J A P Daemen, Jan-Willem H Daemen, Robert J van Oostenbrugge, Werner H Mess, Joachim E Wildberger, Sylvia Heeneman, M Eline Kooi
PURPOSE: To assess parameter agreement of volume transfer coefficient (K(trans) ) between two vascular regions and to study the correlation with microvessel density on histology. The dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) parameter K(trans) is frequently used to study atherosclerotic plaque microvasculature. K(trans) has been reported using different descriptive statistics (mean, median, 75(th) percentile) either for the whole vessel wall or the adventitia in previous studies...
February 2, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28141810/validation-of-blood-volume-fraction-quantification-with-3d-gradient-echo-dynamic-contrast-enhanced-magnetic-resonance-imaging-in-porcine-skeletal-muscle
#12
Stefan Hindel, Anika Söhner, Marc Maaß, Wolfgang Sauerwein, Dorothe Möllmann, Hideo Andreas Baba, Martin Kramer, Lutz Lüdemann
The purpose of this study was to assess the accuracy of fractional blood volume (vb) estimates in low-perfused and low-vascularized tissue using dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI). The results of different MRI methods were compared with histology to evaluate the accuracy of these methods under clinical conditions. vb was estimated by DCE-MRI using a 3D gradient echo sequence with k-space undersampling in five muscle groups in the hind leg of 9 female pigs. Two gadolinium-based contrast agents (CA) were used: a rapidly extravasating, extracellular, gadolinium-based, low-molecular-weight contrast agent (LMCA, gadoterate meglumine) and an extracellular, gadolinium-based, albumin-binding, slowly extravasating blood pool contrast agent (BPCA, gadofosveset trisodium)...
2017: PloS One
https://www.readbyqxmd.com/read/28139354/assessment-of-micronecrotic-tumor-tissue-using-dynamic-contrast-enhanced-magnetic-resonance-imaging
#13
Olga Schimpf, Stefan Hindel, Lutz Lüdemann
Compartmental models for evaluation of dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) datasets assume a homogeneous interstitital volume distribution and homogeneous contrast agent (CA) distribution within each compartment, neglecting effects of CA diffusion within the compartments. When necrotic or micronecrotic tumor tissue is present, these assumptions may no longer be valid. Therefore, the present study investigates the validity of three compartmental models in assessing tumors with necrotic components...
January 27, 2017: Physica Medica: PM
https://www.readbyqxmd.com/read/28132859/improved-performance-of-prostate-dce-mri-using-a-32-coil-vs-12-coil-receiver-array
#14
Stephen J Riederer, Eric A Borisch, Adam T Froemming, Roger C Grimm, Akira Kawashima, Lance A Mynderse, Joshua D Trzasko
PURPOSE: To assess whether acquisition with 32 receiver coils rather than the vendor-recommended 12 coils provides significantly improved performance in 3D dynamic contrast-enhanced MRI (DCE-MRI) of the prostate. MATERIALS: The study was approved by the institutional review board and was compliant with HIPAA. 50 consecutive male patients in whom prostate MRI was clinically indicated were prospectively imaged in March 2015 with an accelerated DCE-MRI sequence in which image reconstruction was performed using 12 and 32 coil elements...
January 27, 2017: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/28120364/evaluation-of-carotid-plaque-vulnerability-in-vivo-correlation-between-dynamic-contrast-enhanced-mri-and-mri-modified-aha-classification
#15
Xiaoqian Ge, Zien Zhou, Huilin Zhao, Xiao Li, Beibei Sun, Shiteng Suo, Maree L Hackett, Jieqing Wan, Jianrong Xu, Xiaosheng Liu
PURPOSE: To noninvasively monitor carotid plaque vulnerability by exploring the relationship between pharmacokinetic parameters (PPs) of dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) and plaque types based on MRI-modified American Heart Association (AHA) classification, as well as to assess the ability of PPs in discrimination between stable and vulnerable plaques suspected on MRI. MATERIALS AND METHODS: Of 70 consecutive patients with carotid plaques who volunteered for 3...
January 24, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28117925/blood-brain-barrier-permeability-of-normal-appearing-white-matter-in-patients-with-vestibular-schwannoma-a-new-hybrid-approach-for-analysis-of-t1-w-dce-mri
#16
Ka-Loh Li, Xiaoping Zhu, Sha Zhao, Alan Jackson
PURPOSE: To develop and assess a "hybrid" method that combines a first-pass analytical approach and the Patlak plot (PP) to improve assessment of low blood-brain barrier permeability from dynamic contrast-enhanced (DCE) magnetic resonance imaging (MRI) data. MATERIALS AND METHODS: Seven patients with vestibular schwannoma were enrolled. T1 -W DCE imaging was acquired on a 1.5T scanner. Normal-appearing white matter (NAWM) was divided into four regions of interest (ROIs) based on the magnitude of changes in longitudinal relaxation rate (ΔR1) after gadolinium administration...
January 24, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28116513/repeatability-and-response-to-therapy-of-dynamic-contrast-enhanced-magnetic-resonance-imaging-biomarkers-in-rheumatoid-arthritis-in-a-large-multicentre-trial-setting
#17
John C Waterton, Meilien Ho, Lars H Nordenmark, Martin Jenkins, Julie DiCarlo, Gwenael Guillard, Caleb Roberts, Giovanni Buonaccorsi, Geoffrey J M Parker, Michael A Bowes, Charles Peterfy, Herbert Kellner, Peter C Taylor
OBJECTIVES: To determine the repeatability and response to therapy of dynamic contrast-enhanced (DCE) MRI biomarkers of synovitis in the hand and wrist of rheumatoid arthritis (RA) patients, and in particular the performance of the transfer constant K (trans) , in a multicentre trial setting. METHODS: DCE-MRI and RA MRI scoring (RAMRIS) were performed with meticulous standardisation at baseline and 6 and 24 weeks in a substudy of fostamatinib monotherapy in reducing synovitis compared with placebo or adalimumab...
January 23, 2017: European Radiology
https://www.readbyqxmd.com/read/28111634/temporal-feature-extraction-from-dce-mri-to-identify-poorly-perfused-subvolumes-of-tumors-related-to-outcomes-of-radiation-therapy-in-head-and-neck-cancer
#18
Daekeun You, Madhava Aryal, Stuart E Samuels, Avraham Eisbruch, Yue Cao
This study aimed to develop an automated model to extract temporal features from DCE-MRI in head-and-neck (HN) cancers to localize significant tumor subvolumes having low blood volume (LBV) for predicting local and regional failure after chemoradiation therapy. Temporal features were extracted from time-intensity curves to build classification model for differentiating voxels with LBV from those with high BV. Support vector machine (SVM) classification was trained on the extracted features for voxel classification...
December 2016: Tomography: a Journal for Imaging Research
https://www.readbyqxmd.com/read/28110743/exploring-the-complementarity-of-thz-pulse-imaging-and-dce-mris-toward-a-unified-multi-channel-classification-and-a-deep-learning-framework
#19
REVIEW
X-X Yin, Y Zhang, J Cao, J-L Wu, S Hadjiloucas
We provide a comprehensive account of recent advances in biomedical image analysis and classification from two complementary imaging modalities: terahertz (THz) pulse imaging and dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI). The work aims to highlight underlining commonalities in both data structures so that a common multi-channel data fusion framework can be developed. Signal pre-processing in both datasets is discussed briefly taking into consideration advances in multi-resolution analysis and model based fractional order calculus system identification...
December 2016: Computer Methods and Programs in Biomedicine
https://www.readbyqxmd.com/read/28092414/dce-mri-of-the-prostate-using-shutter-speed-vs-tofts-model-for-tumor-characterization-and-assessment-of-aggressiveness
#20
Stefanie J Hectors, Cecilia Besa, Mathilde Wagner, Guido H Jajamovich, George K Haines, Sara Lewis, Ashutosh Tewari, Ardeshir Rastinehad, Wei Huang, Bachir Taouli
PURPOSE: To quantify Tofts model (TM) and shutter-speed model (SSM) perfusion parameters in prostate cancer (PCa) and noncancerous peripheral zone (PZ) and to compare the diagnostic performance of dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) to Prostate Imaging and Reporting and Data System (PI-RADS) classification for the assessment of PCa aggressiveness. MATERIALS AND METHODS: Fifty PCa patients (mean age 60 years old) who underwent MRI at 3...
January 16, 2017: Journal of Magnetic Resonance Imaging: JMRI
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