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Renal tractography

Russell Dibb, Chunlei Liu
PURPOSE: To develop a susceptibility-based MRI technique for probing microstructure and fiber architecture of magnetically anisotropic tissues-such as central nervous system white matter, renal tubules, and myocardial fibers-in three dimensions using susceptibility tensor imaging (STI) tools. THEORY AND METHODS: STI can probe tissue microstructure, but is limited by reconstruction artifacts because of absent phase information outside the tissue and noise. STI accuracy may be improved by estimating a joint eigenvector from mutually anisotropic susceptibility and relaxation tensors...
July 6, 2016: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
Long Jiang Zhang, Jiqiu Wen, Xue Liang, Rongfeng Qi, U Joseph Schoepf, Julian L Wichmann, Cole M Milliken, Hui Juan Chen, Xiang Kong, Guang Ming Lu
PURPOSE: To investigate structural and functional alterations of the default mode network (DMN) in the brain after renal transplantation in patients with end-stage renal disease by using diffusion-tensor imaging and resting-state functional MR imaging. MATERIALS AND METHODS: This prospective study was approved by the local medical research ethics committee, and written informed consent was obtained. Twenty-one patients with end-stage renal disease (15 men, six women; mean age ± standard deviation, 32 years ± 9...
February 2016: Radiology
Wen-jun Fan, Tao Ren, Qiong Li, Pan-li Zuo, Miao-miao Long, Chun-bai Mo, Li-hua Chen, Li-xiang Huang, Wen Shen
OBJECTIVES: To investigate the value of diffusion tensor imaging (DTI) and tractography in renal allografts at the early stage after kidney transplantation. METHODS: This study was approved by the institutional ethical review committee, and written informed consent was obtained. A total of 54 renal allograft recipients 2-3 weeks after transplantation and 26 age-matched healthy volunteers underwent renal DTI with a 3.0-T magnetic resonance imaging (MRI) system. Recipients were divided into three groups according to the estimated glomerular filtration rate (eGFR)...
February 2016: European Radiology
Camilo Jaimes, Kassa Darge, Dmitry Khrichenko, Robert H Carson, Jeffrey I Berman
BACKGROUND: Functional magnetic resonance urography (fMRU) provides morphological and functional information based on perfusion. Diffusion tensor imaging (DTI) complements fMRU by measuring renal microstructure and provides insight into the relationship between renal structure and function. OBJECTIVE: To evaluate the feasibility and utility of renal DTI and tractography in the setting of fMRU in children. MATERIALS AND METHODS: We prospectively enrolled 9 children (6 boys, 3 girls) with a mean age of 4...
January 2014: Pediatric Radiology
Caterina Gaudiano, Valeria Clementi, Fiorenza Busato, Beniamino Corcioni, Maria Grazia Orrei, Emiliana Ferramosca, Emma Fabbri, Paola Berardi, Antonio Santoro, Rita Golfieri
OBJECTIVE: To assess renal dysfunction in chronic kidney diseases using diffusion tensor imaging (DTI). METHODS: Forty-seven patients with impaired renal function (study group) and 17 patients without renal diseases (control group) were examined using DTI sequences. Cortical and medullary regions of interest (ROIs) were located to obtain the corresponding values of the apparent diffusion coefficient (ADC) and the fractional anisotropy (FA). The mean values of the ADC and FA, for each ROI site, were obtained in each group and were compared...
June 2013: European Radiology
Han Sun Kim, Jong Won Park, Dai Seg Bai, Jin Young Jeong, Ji Heon Hong, Su Min Son, Sung Ho Jang
Various neurological problems of the brain are known to occur in patients with end stage renal disease (ESRD). However, little is known about diffusion tensor imaging (DTI) findings in patients with ESRD. Using DTI, we attempted to investigate DTI findings in patients with ESRD who showed no specific lesions on conventional brain MRI. We recruited 10 consecutive patients with ESRD for whom at least 3 years had passed since the start of peritoneal dialysis and who showed no neurological abnormality on neurologic examination...
2011: NeuroRehabilitation
Katja Hueper, M Gutberlet, T Rodt, W Gwinner, F Lehner, F Wacker, M Galanski, D Hartung
OBJECTIVES: To evaluate MR diffusion tensor imaging (DTI) as non-invasive diagnostic tool for detection of acute and chronic allograft dysfunction and changes of organ microstructure. METHODS: 15 kidney transplanted patients with allograft dysfunction and 14 healthy volunteers were examined using a fat-saturated echo-planar DTI-sequence at 1.5 T (6 diffusion directions, b = 0, 600 s/mm²). Mean apparent diffusion coefficient (ADC) and mean fractional anisotropy (FA) were calculated separately for the cortex and for the medulla and compared between healthy and transplanted kidneys...
November 2011: European Radiology
MingChen Wu, YuChun Lin, CharngChyi Shieh, YungLiang Wan, Tzung-Hai Yen, KoonKwan Ng, YauYau Wai, JiunJie Wang
RATIONALE AND OBJECTIVES: To measure the anisotropic diffusion in kidney and to demonstrate the feasibility of renal tractography. MATERIALS AND METHODS: Diffusion tensor imaging was acquired in kidney from 10 healthy volunteers and 5 patients with chronic kidney disease. Diffusion indices were calculated from the tensor, including fractional anisotropy, intervoxel diffusion coherence, and mean/axial/radial diffusivity. RESULTS: Acquisitions with respiratory triggering could provide improved image quality in all diffusion indices, as compared to that by breathhold...
September 2011: Academic Radiology
Caterina Gaudiano, Valeria Clementi, Fiorenza Busato, Beniamino Corcioni, Emiliana Ferramosca, Marcora Mandreoli, Benedetta Fabbrizio, Antonio Santoro, Rita Golfieri
The authors report a case of unilateral xanthogranulomatous pyelonephritis, associated with chronic lithiasis studied by standard clinical magnetic resonance imaging protocol and diffusion tensor imaging (DTI). Maps of apparent diffusion coefficient (ADC) and fractional anisotropy (FA) and tractography were reconstructed on both healthy and pathologic kidney. ADC and FA values are in agreement with the literature. Tractography reconstruction of tubular renal architecture was confirmed by histology. This result suggests the potential ability of DTI to detect structural alterations in the architecture of the kidney, as noninvasive tool, preceding the onset of clinical-laboratory alterations...
September 2011: Magnetic Resonance Imaging
Mike Notohamiprodjo, Christian Glaser, Karin A Herrmann, Olaf Dietrich, Ulrike I Attenberger, Maximilian F Reiser, Stefan O Schoenberg, Henrik J Michaely
OBJECTIVE: To evaluate the clinical feasibility of diffusion tensor imaging (DTI) of the kidney in volunteers and patients with renal diseases. MATERIAL AND METHODS: Ten volunteers and 22 patients (mean age, 56 +/- 14.3) with renal masses and renal artery stenosis underwent breath-hold coronal fat-saturated echo-planar DTI (as provided by the manufacturer, 6 diffusion directions, diffusion weightings b = 0 and 300 s/mm2, repetition time 730 ms/echo time 72 ms; 5 slices; slice thickness, 6 mm; inplane resolution, 2...
October 2008: Investigative Radiology
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