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https://www.readbyqxmd.com/read/29331053/renal-flow-and-microstructure-anisotropy-refmap-mri-in-normal-and-peritumoral-renal-tissue
#1
Andrea L Liu, Artem Mikheev, Henry Rusinek, William C Huang, James S Wysock, James S Babb, Thorsten Feiweier, David Stoffel, Hersh Chandarana, Eric E Sigmund
BACKGROUND: Diffusion-weighted imaging (DWI) provides insight into the pathophysiology underlying renal dysfunction. Variants of DWI include intravoxel incoherent motion (IVIM), which differentiates between microstructural diffusion and vascular or tubular flow, and diffusion tensor imaging (DTI), which quantifies diffusion directionality. PURPOSE: To investigate the reproducibility of joint IVIM-DTI and compare controls to presurgical renal mass patients. STUDY TYPE: Prospective cross-sectional...
January 13, 2018: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29308923/intravoxel-incoherent-motion-diffusion-weighted-imaging-of-resectable-oesophageal-squamous-cell-carcinoma-association-with-tumour-stage
#2
Yu-Cheng Huang, Tian-Wu Chen, Xiao-Ming Zhang, Nan-Lin Zeng, Rui Li, Yu-Lian Tang, Fan Chen, Yan-Li Chen
OBJECTIVE: To determine whether intravoxel incoherent motion (IVIM) diffusion-weighted imaging (DWI) derived parameters can be associated with tumour stage of oesophageal squamous cell carcinoma (SCC). METHODS: Sixty patients with resectable oesophageal SCC and 20 healthy individuals underwent oesophageal DWI using multi-b values with a 3.0-T magnetic resonance system. Pure diffusion coefficient (D), perfusion-related incoherent microcirculation (D*), microvascular volume fraction (f) and apparent diffusion coefficient (ADC) were measured on DWI...
January 8, 2018: British Journal of Radiology
https://www.readbyqxmd.com/read/29297204/role-of-intravoxel-incoherent-motion-mri-in-early-assessment-of-the-response-of-esophageal-squamous-cell-carcinoma-to-chemoradiotherapy-a-pilot-study
#3
Huanhuan Zheng, Wei Ren, Xia Pan, Qinglei Zhang, Baorui Liu, Song Liu, Jian He, Zhengyang Zhou
BACKGROUND: Since definitive concurrent chemoradiotherapy (CRT) is standard therapy for inoperable esophageal squamous cell carcinoma (ESCC), early evaluation of treatment response is crucial for patients and would be useful in assessing response, especially in patients with severe side effects. PURPOSE: To explore the feasibility of intravoxel incoherent motion (IVIM) MRI in the early assessment of treatment response to CRT. STUDY TYPE: Prospective...
January 3, 2018: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29281153/microvascular-perfusion-of-the-placenta-developing-fetal-liver-and-lungs-assessed-with-intravoxel-incoherent-motion-imaging
#4
András Jakab, Ruth L Tuura, Raimund Kottke, Nicole Ochsenbein-Kölble, Giancarlo Natalucci, Thi Dao Nguyen, Christian Kellenberger, Ianina Scheer
BACKGROUND: In utero intravoxel incoherent motion magnetic resonance imaging (IVIM-MRI) provides a novel method for examining microvascular perfusion fraction and diffusion in the developing human fetus. PURPOSE: To characterize gestational changes in the microvascular perfusion fraction of the placenta, fetal liver, and lungs using IVIM-MRI. STUDY TYPE: Retrospective, cross-sectional study. SUBJECTS: Fifty-five datasets from 33 singleton pregnancies were acquired (17-36 gestational weeks)...
December 27, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29281151/quantitative-intravoxel-incoherent-motion-parameters-derived-from-whole-tumor-volume-for-assessing-pathological-complete-response-to-neoadjuvant-chemotherapy-in-locally-advanced-rectal-cancer
#5
Qiaoyu Xu, Yanyan Xu, Hongliang Sun, Queenie Chan, Kaining Shi, Aiping Song, Wu Wang
BACKGROUND: Many locally advanced rectal cancer (LARC) patients can benefit from neoadjuvant chemotherapy (NACT), with some achieving a pathological complete response (pCR). However, there is limited research reporting on the value of intravoxel incoherent motion (IVIM) in monitoring pCR in patients with LARC. PURPOSE: To identify whether IVIM parameters derived from whole-tumor volume (WTV) before and after NACT could accurately assess pCR in patients with LARC...
December 27, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29279173/differentiating-between-benign-and-malignant-sinonasal-lesions-using-dynamic-contrast-enhanced-mri-and-intravoxel-incoherent-motion
#6
Jingxuan Jiang, Zebin Xiao, Zuohua Tang, Yufeng Zhong, Jinwei Qiang
PURPOSE: To explore the value of dynamic contrast-enhanced MRI (DCE-MRI) and intravoxel incoherent motion (IVIM) for distinguishing between benign and malignant sinonasal lesions and investigate the correlations between the two methods. METHODS AND MATERIALS: Patients with sinonasal lesions (42 benign and 31 malignant) who underwent DCE-MRI and IVIM before confirmation by histopathology were enrolled in this prospective study. Parameters derived from DCE-MRI and IVIM were measured, the optimal cut-off values for differential diagnosis were determined, and the correlations between the two methods were evaluated...
January 2018: European Journal of Radiology
https://www.readbyqxmd.com/read/29278765/gd-eob-dtpa-enhanced-t1%C3%AF-imaging-vs-diffusion-metrics-for-assessment-liver-inflammation-and-early-stage-fibrosis-of-nonalcoholic-steatohepatitis-in-rabbits
#7
Yuanliang Xie, Hongfeng Zhang, Chaoling Jin, Xiang Wang, Xiaoqi Wang, Jingting Chen, Yikai Xu
To assess the value of T1ρ,T1ρ on hepatobiliary phase (HBP) and diffusion metrics in staging of Non-alcoholic fatty liver disease (NAFLD) activity scores, inflammation, fibrosis in NASH rabbits model. Non-alcoholic steatohepatitis (NASH) rabbits model was induced by feeding a varied duration of high-fat, high-cholesterol diet. T1ρ,T1ρ (HBP) 20min after administration of Gd-EOB-DTPA, and Intravoxel incoherent motion imaging (IVIM) diffusion-weighted imaging were performed on a 3.0T magnetic resonance (MR) imaging unit...
December 23, 2017: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/29278762/intravoxel-incoherent-motion-diffusion-weighted-mri-for-predicting-response-to-neoadjuvant-chemotherapy-in-breast-cancer
#8
Yunju Kim, Sung Hun Kim, Hye Won Lee, Byung Joo Song, Bong Joo Kang, Ahwon Lee, Yoonho Nam
PURPOSE: To determine the diagnostic performance of intravoxel incoherent motion (IVIM) diffusion-weighted (DW) magnetic resonance imaging (MRI) parameters in predicting response to neoadjuvant chemotherapy (NAC) in breast cancer patients. MATERIALS AND METHODS: Forty-six patients with stage II or III breast cancer underwent MRI including DW imaging with 10 b values before and after 2cycles of NAC. Apparent diffusion coefficient (ADC) and IVIM parameters (D, D*, and f) were obtained using histogram analysis derived from whole-tumor volumes...
December 23, 2017: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/29277647/what-can-we-see-with-ivim-mri
#9
Denis Le Bihan
Intravoxel Incoherent Motion (IVIM) refers to translational movements which within a given voxel and during the measurement time present a distribution of speeds in orientation and/or amplitude. The IVIM concept has been used to estimate perfusion in tissues as blood flow in randomly oriented capillaries mimics a pseudo-diffusion process. IVIM-based perfusion MRI, which does not require contrast agents, has gained momentum recently, especially in the field oncology. In this introductory review the basic concepts, models, technical requirements and limitations inherent to IVIM-based perfusion MRI are outlined, as well as new, non-perfusion applications of IVIM MRI, such as virtual MR Elastography...
December 22, 2017: NeuroImage
https://www.readbyqxmd.com/read/29262507/-measurement-reproducibility-of-parameters-derived-from-introvoxel-incoherent-motion-diffusion-weighted-mri-imaging-of-rectal-cancer
#10
Y K Meng, C D Zhang, H M Zhang, F Ye, H Ouyang, X M Zhao, K Xu, C W Zhou
Objective: To study the measurement reproducibility of parameters derived from introvoxel incoherent motion (IVIM) diffusion-weighted imaging (DWI)-MRI of rectal cancer between- and within- radiologists. Methods: Clinical data of 34 patients with rectal cancer were prospective analyzed. Conventional MRI sequences, IVIM DWI-MRI with sixteen b values and dynamic contrast enhancement (DCE)-MRI sequences of rectum were acquired by GE 3.0-T MRI imager. The IVIM sequence images with b value=1000 sec/mm(2) were selected to measure the maximum axial section of tumor by a radiologist with 15 year-experiences in gastrointestinal cancer imaging...
December 23, 2017: Zhonghua Zhong Liu za Zhi [Chinese Journal of Oncology]
https://www.readbyqxmd.com/read/29260575/increased-diffusion-and-decreased-perfusion-in-epiphyses-of-femoral-heads-detected-via-intravoxel-incoherent-motion-after-closed-reduction-in-children-with-developmental-dysplasia-of-the-hip
#11
Xiang Hong Meng, Xue Ning Zhang, Zhi Wang, Jian Ping Yang, Zhong Li Zhang, Shuang Xia
Background Patients with developmental dysplasia of the hip (DDH) may have decreased blood supply to the femoral heads. Finding a non-invasive method to evaluate whether the femoral heads in patients with DDH are ischemic is paramount for orthopedic surgeons. Purpose To identify whether parameters reflecting perfusion and diffusion in intravoxel incoherent motion (IVIM) sequences can be used to assess ischemia in femoral heads in patients with DDH after closed reduction. Material and Methods Twenty-eight patients with DDH who had undergone closed reduction were enrolled...
January 1, 2017: Acta Radiologica
https://www.readbyqxmd.com/read/29259149/comparison-of-intravoxel-incoherent-motion-diffusion-weighted-magnetic-resonance-mr-imaging-to-t1-mapping-in-characterization-of-hepatic-alveolar-echinococcosis
#12
Yibanu Abudureheman, Jian Wang, Wenya Liu
BACKGROUND The aim of this study was to compare intravoxel incoherent motion diffusion-weighted magnetic resonance imaging (IVIM DW MRI) to T1 mapping for characterization of hepatic alveolar echinococcosis (HAE). MATERIAL AND METHODS Eighteen HAE patients confirmed by surgery were examined with conventional MRI, IVIM DWI MRI with 10 b values (range: 0-1,000 sec/mm²), and longitudinal relaxation time (T1) mapping. Diffusion coefficient (D), perfusion fraction (f), pseudo-diffusion coefficient (D*), and T1 relaxation time were calculated in solid components, perilesional components, and background liver parenchyma of HAE patients...
December 20, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/29246201/multiparametric-functional-magnetic-resonance-imaging-for-evaluation-of-hepatic-warm-ischemia-reperfusion-injury-in-a-rabbit-model
#13
Qian Ji, Zhi Qiang Chu, Tao Ren, Shi Chao Xu, Long Jiang Zhang, Wen Shen, Guang Ming Lu
BACKGROUND: To assess the feasibility of noninvasive and quantitative evaluation of hepatic pathophysiological changes in rabbit hepatic warm ischemia-reperfusion injury (WIRI) models by using intravoxel incoherent motion (IVIM), diffusion tensor imaging (DTI) and blood oxygen level dependent (BOLD) MRI. METHODS: Twenty rabbits were randomly divided into hepatic WIRI model group and sham-operation group (n = 10 for each group). Hepatic WIRI was induced in rabbit by occluding hepatic inflow for 30 min and reperfusion for 6 h...
December 15, 2017: BMC Gastroenterology
https://www.readbyqxmd.com/read/29231040/differentiation-between-phyllodes-tumors-and-fibroadenomas-using-intravoxel-incoherent-motion-magnetic-resonance-imaging-comparison-with-conventional-diffusion-weighted-imaging
#14
Hiroko Kawashima, Tosiaki Miyati, Naoki Ohno, Masako Ohno, Masafumi Inokuchi, Hiroko Ikeda, Toshifumi Gabata
OBJECTIVE: To investigate whether the parameters derived from intravoxel incoherent motion (IVIM) magnetic resonance imaging (MRI) could differentiate phyllodes tumors (PTs) from fibroadenomas (FAs) by comparing the apparent diffusion coefficient (ADC) values. METHODS: This retrospective study included seven FAs, 10 benign PTs (BPTs), four borderline PTs, and one malignant PT. Biexponential analyses of IVIM were performed using a 3 T MRI scanner. Quantitative IVIM parameters (pure diffusion coefficient [D], perfusion-related diffusion coefficient [D*], and fraction [f]) were calculated...
December 12, 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/29229579/investigation-of-the-pulsatility-of-cerebrospinal-fluid-using-cardiac-gated-intravoxel-incoherent-motion-imaging
#15
Anton S Becker, Andreas Boss, Markus Klarhoefer, Tim Finkenstaedt, Moritz C Wurnig, Cristina Rossi
The quantitative and non-invasive monitoring of cerebrospinal fluid (CSF) dynamics and composition may have high clinical relevance in the management of CSF disorders. In this study, we propose the use of the Intravoxel Incoherent Motion (IVIM) MRI for obtaining simultaneous measurements of CSF self-diffusion and fluid circulation. The rationale for this study was that turbulent fluid and mesoscopic fluid fluctuations can be modeled in a first approximation as a fast diffusion process. In this case, we expect that the fast fluid circulation and slower molecular diffusion dynamics can be quantified, assuming a bi-exponential attenuation pattern of the diffusion-weighted signal in MRI...
December 8, 2017: NeuroImage
https://www.readbyqxmd.com/read/29222676/intravoxel-incoherent-motion-mr-imaging-of-early-cervical-carcinoma-correlation-between-imaging-parameters-and-tumor-stroma-ratio
#16
Xiangsheng Li, Ping Wang, Dechang Li, Hongxian Zhu, Limin Meng, Yunlong Song, Lizhi Xie, Jianping Zhu, Tao Yu
OBJECTIVES: To investigate if intravoxel incoherent motion (IVIM) MR imaging can predict the tumour-stroma ratio (TSR) in patients with early cervical carcinoma. METHODS: Fifty-four patients with early cervical carcinoma were prospectively enrolled into this study. All patients underwent IVIM imaging and parameters including D, D* and f value were measured. The tumours were classified into stroma-rich and stroma-poor group according to TSR, and comparisons of IVIM parameters between two groups were performed...
December 8, 2017: European Radiology
https://www.readbyqxmd.com/read/29217491/intravoxel-incoherent-motion-diffusion-weighted-imaging-for-the-assessment-of-renal-fibrosis-of-chronic-kidney-disease-a-preliminary-study
#17
Wei Mao, Jianjun Zhou, Mengsu Zeng, Yuqin Ding, Lijie Qu, Caizhong Chen, Xiaoqiang Ding, Yaqiong Wang, Caixia Fu, Feng Gu
PURPOSE: To investigate the potential of Intravoxel incoherent motion diffusion-weighted imaging(IVIM-DWI) for the assessment of renal fibrosis in chronic kidney disease (CKD), using histopathology as a reference standard. METHODS: Eighty-five CKD patients and twenty healthy volunteers were recruited in this study. IVIM-DWI was performed in all of the participants, and all of the CKD patients underwent renal biopsy. The mean values of the true diffusion coefficient (D), pseudo diffusion coefficient (D*) and perfusion fraction (f) in the renal cortex and medulla were compared between the CKD patients and healthy volunteers...
December 4, 2017: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/29212282/intravoxel-incoherent-motion-diffusion-weighted-mr-imaging-of-the-liver-using-respiratory-cardiac-double-triggering
#18
Jinning Li, Caiyuan Zhang, Yanfen Cui, Huanhuan Liu, Weibo Chen, Guilong Wang, Dengbin Wang
To investigate the influence of respiratory-cardiac double triggering (RCT) on intravoxel incoherent motion (IVIM) diffusion-weighted imaging (DWI) for the liver, twelve healthy volunteers underwent liver DWI twice respectively with respiratory triggering (RT) and RCT schemes. Signal-to-noise ratios (SNRs) of the images, values, repeatability (evaluating with within-subject coefficient of variation), and variability of quantitative parameters, including apparent diffusion coefficient (ADC), pure diffusion coefficient (D), perfusion fraction (f), and perfusion-related diffusion coefficient (D*), were evaluated for each DWI sequence...
November 7, 2017: Oncotarget
https://www.readbyqxmd.com/read/29159937/diffusion-weighted-mri-and-intravoxel-incoherent-motion-model-for-diagnosis-of-pediatric-solid-abdominal-tumors
#19
Emma M Meeus, Niloufar Zarinabad, Karen A Manias, Jan Novak, Heather E L Rose, Hamid Dehghani, Katharine Foster, Bruce Morland, Andrew C Peet
BACKGROUND: Pediatric retroperitoneal tumors in the renal bed are often large and heterogeneous, and their diagnosis based on conventional imaging alone is not possible. More advanced imaging methods, such as diffusion-weighted (DW) MRI and the use of intravoxel incoherent motion (IVIM), have the potential to provide additional biomarkers that could facilitate their noninvasive diagnosis. PURPOSE: To assess the use of an IVIM model for diagnosis of childhood malignant abdominal tumors and discrimination of benign from malignant lesions...
November 21, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29144153/intravoxel-incoherent-motion-diffusion-weighted-mr-imaging-for-differentiation-of-benign-and-malignant-musculoskeletal-tumors-at-3-t
#20
Hyun Kyong Lim, Won-Hee Jee, Joon-Yong Jung, Mun Young Paek, InSeong Kim, Chan-Kwon Jung, Yang-Guk Chung
OBJECTIVE: To evaluate the intravoxel incoherent motion (IVIM) diffusion-weighted (DW) magnetic resonance imaging (MRI) for differentiating between benign and malignant musculoskeletal tumors at 3 T. METHODS: Sixty-five patients with treatment-naïve musculoskeletal tumors (47 malignant and 23 benign lesions) who underwent 3 T MRI including IVIM DW imaging were included. IVIM-derived parameters included pure diffusion coefficient (D), perfusion related incoherent microcirculation (D*, pseudodiffusion coefficient), and perfusion fraction (f)...
November 16, 2017: British Journal of Radiology
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