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Mri diffusion

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https://www.readbyqxmd.com/read/29656628/cerebral-thromboembolic-events-during-anterior-cervical-spine-surgery-retrospective-case-series-study-with-diffusion-weighted-magnetic-resonance-imaging-follow-up-in-the-immediate-postoperative-period
#1
Seok-Won Chung, Min-Soo Kang, Sang-Ho Lee, Shin-Young Lee, Yong-Hwan Shin, Chan-Hong Park
OBJECTIVE: We evaluated the efficacy of diffusion-weighted magnetic resonance imaging (DW-MRI) in detecting perioperative cerebral thromboembolic events after anterior cervical discectomy and fusion (ACDF). METHODS: This retrospective case series included 51 consecutive patients that underwent ACDF. To assess baseline presence of plaque or stenosis, all patients were assessed for risk factors of cerebrovascular events and underwent carotid ultrasound preoperatively and cerebral DW-MRI was performed in all patients postoperatively, with areas of high signal intensity interpreted as a cerebral thromboembolic event...
March 2018: Neurospine
https://www.readbyqxmd.com/read/29656584/improving-lymph-node-characterization-in-staging-malignant-lymphoma-using-first-order-adc-texture-analysis-from-whole-body-diffusion-weighted-mri
#2
Katja N De Paepe, Frederik De Keyzer, Pascal Wolter, Oliver Bechter, Daan Dierickx, Ann Janssens, Gregor Verhoef, Raymond Oyen, Vincent Vandecaveye
BACKGROUND: Correct staging and treatment initiation in malignant lymphoma depends on accurate lymph node characterization. However, nodal assessment based on conventional and diffusion-weighted (DWI) MRI remains challenging, particularly in smaller nodes. PURPOSE: To evaluate first-order apparent diffusion coefficient (ADC) texture parameters compared to mean ADC for lymph node characterization in non-Hodgkin lymphoma (NHL) using whole-body DWI (WB-DWI). STUDY TYPE: Retrospective...
April 14, 2018: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/29656440/in-plane-superresolution-mri-with-phaseless-sub-pixel-encoding
#3
Franciszek Hennel, Rui Tian, Maria Engel, Klaas P Pruessmann
PURPOSE: Acquisition of high-resolution imaging data using multiple excitations without the sensitivity to fluctuations of the transverse magnetization phase, which is a major problem of multi-shot MRI. THEORY AND METHODS: The concept of superresolution MRI based on microscopic tagging is analyzed using an analogy with the optical method of structured illumination. Sinusoidal tagging is shown to provide subpixel resolution by mixing of neighboring spatial frequency (k-space) bands...
April 15, 2018: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29656321/multi-center-reproducibility-of-structural-diffusion-tensor-and-resting-state-functional-magnetic-resonance-imaging-measures
#4
S Deprez, Michiel B de Ruiter, S Bogaert, R Peeters, J Belderbos, D De Ruysscher, S Schagen, S Sunaert, P Pullens, E Achten
PURPOSE: The aim of this study is to assess multi-center reproducibility and longitudinal consistency of MRI imaging measurements, as part of a phase III longitudinal multi-center study comparing the neurotoxic effect following prophylactic cranial irradiation with hippocampal avoidance (HA-PCI), in comparison with conventional PCI in patients with small-cell lung cancer. METHODS: Harmonized MRI acquisition protocols from six participating sites and two different vendors were compared using both physical and human phantoms...
April 14, 2018: Neuroradiology
https://www.readbyqxmd.com/read/29655938/delineation-of-early-brain-development-from-fetuses-to-infants-with-diffusion-mri-and-beyond
#5
REVIEW
Minhui Ouyang, Jessica Dubois, Qinlin Yu, Pratik Mukherjee, Hao Huang
Dynamic macrostructural and microstructural changes take place from the mid-fetal stage to 2 years after birth. Delineating brain structural changes during this early developmental period provides new insights into the complicated processes of both typical brain development and the pathological mechanisms underlying various psychiatric and neurological disorders including autism, attention deficit hyperactivity disorder and schizophrenia. Decades of histological studies have identified strong spatial and functional gradients of maturation in human brain gray and white matter...
April 12, 2018: NeuroImage
https://www.readbyqxmd.com/read/29653337/investigation-of-microstructural-abnormalities-in-white-and-gray-matter-around-hippocampus-with-diffusion-tensor-imaging-dti-in-temporal-lobe-epilepsy-tle
#6
Yixin Bao, Ruqian He, Qingyi Zeng, Pan Zhu, Rongyuan Zheng, Huiqin Xu
OBJECTIVE: The objective of this study was to apply diffusion tensor imaging (DTI) to investigate microstructural abnormalities in temporal lobe epilepsy (TLE) with and without hippocampal sclerosis (HS). MATERIALS: Totally, 19 patients with TLE with HS and 23 patients with TLE without HS were included. Fiber tracking fibers focused on the parahippocampal cingulum (PHC), cingulate gyrus (CG), and fornix (FORX). Fractional anisotropy (FA) and mean diffusivity (MD) values were obtained, and hippocampal volumes were measured...
April 10, 2018: Epilepsy & Behavior: E&B
https://www.readbyqxmd.com/read/29651606/age-related-apparent-diffusion-coefficients-of-lumbar-vertebrae-in-healthy-children-at-1-5-t
#7
Alexander Tschischka, Christoph Schleich, Johannes Boos, Markus Eichner, Jörg Schaper, Joel Aissa, Gerald Antoch, Dirk Klee
BACKGROUND: Diffusion-weighted magnetic resonance imaging with apparent diffusion coefficient (ADC) calculation is important for detecting bone marrow pathologies. OBJECTIVE: To investigate age-related differences of lumbar vertebral body ADC to establish normal values for healthy children. MATERIALS AND METHODS: Forty-nine healthy children without any history of oncological or hematological diseases (10.2±4.7 years, range: 0-20 years) were included in this retrospective study...
April 13, 2018: Pediatric Radiology
https://www.readbyqxmd.com/read/29649797/a-multimodal-approach-to-the-treatment-of-intraparenchymal-meningioma-in-a-7-year-old-boy-a-case-report
#8
Maria Caterina Vescovi, Daniele Bagatto, Gabriele Capo, Marta Maieron, Dario Marin, Enrico Pegolo, Barbara Tomasino
Intraparenchymal meningiomas are very rare: only 26 cases have been diagnosed in patients younger than 20 years since 1954. They can lead to preoperative differential diagnosis mistakes due to their atypical neuroimaging appearance. A multimodal approach is thus necessary to plan a surgical procedure aiming to receive the best extent of resection while preserving the patient's functional integrity. The authors report the case of a 7-year-old boy with a history of blurred vision, left eye deviation, and weakness on the left side of his body...
April 12, 2018: Pediatric Neurosurgery
https://www.readbyqxmd.com/read/29649574/detection-of-high-gs-risk-group-prostate-tumors-by-diffusion-tensor-imaging-and-logistic-regression-modelling
#9
Gokhan Ertas
PURPOSE: To assess the value of joint evaluation of diffusion tensor imaging (DTI) measures by using logistic regression modelling to detect high GS risk group prostate tumors. MATERIALS AND METHODS: Fifty tumors imaged using DTI on a 3 T MRI device were analyzed. Regions of interests focusing on the center of tumor foci and noncancerous tissue on the maps of mean diffusivity (MD) and fractional anisotropy (FA) were used to extract the minimum, the maximum and the mean measures...
April 9, 2018: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/29649321/prediction-of-lateral-pelvic-lymph-node-metastasis-in-patients-with-locally-advanced-rectal-cancer-with-preoperative-chemoradiotherapy-focus-on-mr-imaging-findings
#10
Min Ju Kim, Bo Yun Hur, Eun Sun Lee, Boram Park, Jungnam Joo, Min Jung Kim, Sung Chan Park, Ji Yeon Baek, Hee Jin Chang, Dae Yong Kim, Jae Hwan Oh
PURPOSE: To investigate the predictive factors for lateral pelvic lymph node (LPLN) metastasis in patients with locally advanced rectal cancer treated with preoperative chemoradiotherapy (CRT). MATERIALS AND METHODS: Fifty-seven patients with locally advanced rectal cancer and LPLNs larger than 5 mm underwent LPLN dissection (LPLD) after preoperative CRT. The MRI findings, including the apparent diffusion coefficient value and LPLN size reduction rate before/after CRT; clinical factors; and pathologic results were evaluated to identify the predictive factors associated with LPLN metastasis...
2018: PloS One
https://www.readbyqxmd.com/read/29648462/a-systematic-review-of-neuroimaging-findings-in-children-and-adolescents-with-sports-related-concussion
#11
Emilie Chamard, Jonathan D Lichtenstein
BACKGROUND: Sport-related concussion (SRC) generally does not result in structural anomalies revealed through clinical imaging techniques such as MRI and CT. While advanced neuroimaging techniques offer another avenue to investigate the subtle alterations following SRC, the current pediatric literature in this area has yet to be reviewed. The aim of this review is to systematically explore the literature on magnetic resonance spectroscopy (MRS), diffusion tensor imaging (DTI), functional magnetic resonance imaging (fMRI), and cortical thickness following SRC in children and adolescents...
April 12, 2018: Brain Injury: [BI]
https://www.readbyqxmd.com/read/29644993/apparent-diffusion-coefficient-to-subdivide-breast-imaging-reporting-and-data-system-magnetic-resonance-imaging-bi-rads-mri-category-4-lesions
#12
Dandan Liu, Zhaogui Ba, Xiaoli Ni, Linhong Wang, Dexin Yu, Xiangxing Ma
BACKGROUND This study aims to subdivide BI-RADS-MRI (Breast Imaging Reporting and Data System Magnetic Resonance Imaging) Category 4 lesions and to evaluate the role of Fischer's scoring system, apparent diffusion coefficient (ADC), and Fischer's + ADC in differential diagnosis of breast lesions. MATERIAL AND METHODS This study retrospectively analyzed the data of 143 patients (150 breast lesions), who were diagnosed by biopsy, and received dynamic contrast enhancement and diffusion-weighted imaging. The diagnostic efficacies of ADC, Fischer's scoring system, and the Fischer's + ADC were analyzed by the receiver operating characteristics curve...
April 12, 2018: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/29643518/-application-of-anoptomagnetic-probe-gd-do3a-ea-fitc-in-imaging-and-analyzing-the-brain-interstitial-space
#13
Y Q Li, Y Sheng, L Liang, Y Zhao, H Y Li, N Bai, T Wang, L Yuan, H B Han
OBJECTIVE: To investigate the application of the optical magnetic bimodal molecular probe Gd-DO3A-ethylthiouret-fluorescein isothiocyanate (Gd -DO3A-EA-FITC) in brain tissue imaging and brain interstitial space (ISS). METHODS: In the study, 24 male SD rats were randomly divided into 3 groups, including magnetic probe group (n=6), optical probe group (n=6) and optical magnetic bimodal probe group (n=12), then the optical magnetic bimodal probe group was divided equally into magnetic probe subgroup (n=6) and optical probe subgroup (n=6)...
April 18, 2018: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/29643515/-role-of-aquaporin-4-in-the-change-of-interstitial-fluid-drainage-in-alzheimer-s-disease
#14
E Liu, Y X Zhang, L L Sun, Z Teng, A B Wang, H B Han, J H Yan
OBJECTIVE: To observe the characteristics of the interstitial fluid (ISF) drainage in the Alzheimer's disease (AD) rats through magnetic resonance imaging (MRI) tracer gadolinium-diethylene triamine pentacetic acid (Gd-DTPA)spread in the brain extracellular space (ECS) and to discuss the role of aquaporin-4 (Aqp4) in the AD. METHODS: Wild type SD rats (300-350 g) and Aqp4 gene knock out (Aqp4-/- ) SD rats (300-350g) were divided into Sham group, AD group, Aqp4-/- -Sham group and Aqp4-/- -AD group...
April 18, 2018: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/29642961/preoperative-magnetic-resonance-imaging-diagnostic-features-of-uterine-leiomyosarcomas-a-systematic-review
#15
Helen Kaganov, Alex Ades, David Stuart Fraser
OBJECTIVES: There are no current established pathognomonic diagnostic features for uterine leiomyosarcomas in the pre- or perioperative setting. Recent inadvertent upstaging of this rare malignancy during laparoscopic morcellation of a presumed fibroid has prompted widespread debate among clinicians regarding the safety of current surgical techniques for management of fibroids. This study aims to conduct a systematic review investigating significant diagnostic features in magnetic resonance imaging (MRI) of uterine leiomyosarcomas...
April 12, 2018: International Journal of Technology Assessment in Health Care
https://www.readbyqxmd.com/read/29642773/dce-mri-derived-volume-transfer-constant-k-trans-and-dwi-apparent-diffusion-coefficient-as-predictive-markers-of-short-and-long-term-efficacy-of-chemoradiotherapy-in-patients-with-esophageal-cancer
#16
Zhi-Min Ye, Shu-Jun Dai, Feng-Qin Yan, Lei Wang, Jun Fang, Zhen-Fu Fu, Yue-Zhen Wang
This study aimed to evaluate both the short- and long-term efficacies of chemoradiotherapy in relation to the treatment of esophageal cancer . This was achieved through the use of dynamic contrast-enhanced magnetic resonance imaging-derived volume transfer constant and diffusion weighted imaging-derived apparent diffusion coefficient . Patients with esophageal cancer were assigned into the sensitive and resistant groups based on respective efficacies in chemoradiotherapy. Dynamic contrast-enhanced magnetic resonance imaging and diffusion weighted imaging were used to measure volume transfer constant and apparent diffusion coefficient, while computed tomography was used to calculate tumor size reduction rate...
January 1, 2018: Technology in Cancer Research & Treatment
https://www.readbyqxmd.com/read/29629942/paediatric-multiple-sclerosis-and-other-acute-demyelinating-diseases
#17
Kevin Rostásy, Barbara Bajer-Kornek
PURPOSE OF REVIEW: Neuroimmunological diseases encompass a wide spectrum of diseases in children. Apart from the discovery of autoantibodies affecting primarily grey matter structures and the improved clinical characterization of rare entities such as N-methyl D-aspartate receptor-R- encephalitis, important strides have also been made in autoimmune-mediated white matter diseases, including paediatric multiple sclerosis (pedMS) and other acute demyelinating syndromes (ADS) often associated with antibodies (abs) against myelin-oligodendrocyte-glycoprotein (MOG)...
April 7, 2018: Current Opinion in Neurology
https://www.readbyqxmd.com/read/29629807/clinical-feasibility-of-mr-elastography-in-patients-with-biliary-obstruction
#18
Dong Kyu Kim, Jin Young Choi, Mi-Suk Park, Myeong-Jin Kim, Yong Eun Chung
OBJECTIVE: The purpose of this study is to evaluate the clinical effect of liver stiffness measured using MR elastography (MRE) in patients with cholestasis due to biliary obstruction. MATERIALS AND METHODS: In this retrospective study, 69 consecutive patients with no history of diffuse liver disease who underwent pancreaticobiliary imaging with MRE were included. Quantitative MRI parameters (i.e., liver stiffness, apparent diffusion coefficient, R2*, and proton density fat fraction) and laboratory results (i...
April 9, 2018: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/29629794/does-the-addition-of-dwi-to-fluid-sensitive-conventional-mri-of-the-sacroiliac-joints-improve-the-diagnosis-of-sacroiliitis
#19
Luis S Beltran, Mohammad Samim, Soterios Gyftopoulos, Mary T Bruno, Catherine N Petchprapa
OBJECTIVE: The purpose of this study was to determine whether adding DWI to conventional MRI of the sacroiliac joints improves the diagnostic performance of MRI readers in the detection of sacroiliitis. MATERIALS AND METHODS: MR images of the sacroiliac joints of 63 patients with lower back pain obtained between January 2016 and December 2016 were analyzed retrospectively. Three readers reviewed the MRI studies for bone marrow edema lesions around the sacroiliac joints as a marker of active sacroiliitis and gave a diagnostic confidence score of 0-4 using MRI without DWI and MRI with DWI in separate sessions...
April 9, 2018: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/29629500/altered-structural-brain-connectivity-involving-the-dorsal-and-ventral-language-pathways-in-16p11-2-deletion-syndrome
#20
Banu Ahtam, Naira Link, Erikson Hoff, P Ellen Grant, Kiho Im
Copy number variants at the chromosomal locus 16p11.2 contribute to neurodevelopmental disorders such as autism spectrum disorders, epilepsy, schizophrenia, and language and articulation disorders. Here, we provide detailed findings on the disrupted structural brain connectivity in 16p11.2 deletion syndrome (patients: N = 21, age range: 8-16 years; typically developing (TD) controls: 18, 9-16 years) using structural and diffusion MRI. We performed global short-, middle-, long-range, and interhemispheric connectivity analysis in the whole brain using gyral topology-based cortical parcellation...
April 9, 2018: Brain Imaging and Behavior
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