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https://www.readbyqxmd.com/read/28653214/three-dimensional-black-blood-multi-contrast-carotid-imaging-using-compressed-sensing-a-repeatability-study
#1
Jianmin Yuan, Ammara Usman, Scott A Reid, Kevin F King, Andrew J Patterson, Jonathan H Gillard, Martin J Graves
OBJECTIVE: The purpose of this work is to evaluate the repeatability of a compressed sensing (CS) accelerated multi-contrast carotid protocol at 3 T. MATERIALS AND METHODS: Twelve volunteers and eight patients with carotid disease were scanned on a 3 T MRI scanner using a CS accelerated 3-D black-blood multi-contrast protocol which comprises T 1w, T 2w and PDw without CS, and with a CS factor of 1.5 and 2.0. The volunteers were scanned twice, the lumen/wall area and wall thickness were measured for each scan...
June 26, 2017: Magma
https://www.readbyqxmd.com/read/28629953/3d-black-blood-mr-angiography-of-the-carotid-arteries-a-simple-sequence-for-plaque-hemorrhage-and-stenosis-evaluation
#2
Monica Sigovan, Clément Bidet, Sébastien Bros, Loic Boussel, Laura Mechtouff, Philip M Robson, Zahi A Fayad, Antoine Millon, Philippe Douek
OBJECTIVES: To evaluate the diagnostic performance of a new three-dimensional T1-weighted turbo-spin-echo sequence (3D T1-w TSE) compared to 3D contrast-enhanced angiography (CE-MRA) for stenosis measurement and compared to 2D T1-w TSE for intra-plaque hemorrhage (IPH) detection. METHODS: Eighty three patients underwent carotid MRI, using a new elliptic-centric phase encoding T1-weighted 3D TSE sequence in addition to the clinical protocol. Two observers evaluated image quality, presence of flow artifacts, and presence of intra-plaque hemorrhage, and computed the NASCET degree of stenosis for CE-MRA and for the new sequence...
June 16, 2017: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/28629561/multi-contrast-and-three-dimensional-assessment-of-the-aortic-wall-using-3t-mri
#3
Thomas Wehrum, Iulius Dragonu, Christoph Strecker, Jürgen Hennig, Andreas Harloff
OBJECTIVES: To develop a 3D-multi-contrast MRI protocol allowing for high resolution imaging of the wall and of atheroma in the thoracic aorta. METHODS: Eleven healthy volunteers and eleven acute stroke patients with aortic plaques detected by TEE underwent MRI at 3T. The MRI-protocol consisted of a T1w-bright-blood, a T2w- and a PDw-black-blood sequence (spatial resolution=1.15mm(3)). Image quality was assessed by two blinded investigators using a 3-point score and intra- and inter-rater agreement was tested...
June 2017: European Journal of Radiology
https://www.readbyqxmd.com/read/28626998/large-coverage-black-bright-blood-interleaved-imaging-sequence-labbi-for-3d-dynamic-contrast-enhanced-mri-of-vessel-wall
#4
Haikun Qi, Feng Huang, Zechen Zhou, Peter Koken, Niranjan Balu, Bida Zhang, Chun Yuan, Huijun Chen
PURPOSE: To propose a large coverage black-bright blood interleaved imaging sequence (LaBBI) for 3D dynamic contrast-enhanced MRI (DCE-MRI) of the vessel wall. METHODS: LaBBI consists of a 3D black-blood stack-of-stars golden angle radial acquisition with high spatial resolution for vessel wall imaging and a 2D bright-blood Cartesian acquisition with high temporal resolution for arterial input function estimation. The two acquisitions were performed in an interleaved fashion within a single scan...
June 19, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28619834/temporal-and-spatial-variances-in-arterial-spin-labeling-are-inversely-related-to-large-artery-blood-velocity
#5
A D Robertson, G Matta, V S Basile, S E Black, C K Macgowan, J A Detre, B J MacIntosh
BACKGROUND AND PURPOSE: The relationship between extracranial large-artery characteristics and arterial spin-labeling MR imaging may influence the quality of arterial spin-labeling-CBF images for older adults with and without vascular pathology. We hypothesized that extracranial arterial blood velocity can explain between-person differences in arterial spin-labeling data systematically across clinical populations. MATERIALS AND METHODS: We performed consecutive pseudocontinuous arterial spin-labeling and phase-contrast MR imaging on 82 individuals (20 - 88 years of age, 50% women), including healthy young adults, healthy older adults, and older adults with cerebral small vessel disease or chronic stroke infarcts...
June 15, 2017: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/28606731/cognitive-function-and-kidney-disease-baseline-data-from-the%C3%A2-systolic-blood-pressure-intervention-trial-sprint
#6
Daniel E Weiner, Sarah A Gaussoin, John Nord, Alexander P Auchus, Gordon J Chelune, Michel Chonchol, Laura Coker, William E Haley, Anthony A Killeen, Paul L Kimmel, Alan J Lerner, Suzanne Oparil, Mohammad G Saklayen, Yelena M Slinin, Clinton B Wright, Jeff D Williamson, Manjula Kurella Tamura
BACKGROUND: Chronic kidney disease is common and is associated with cardiovascular disease, cerebrovascular disease, and cognitive function, although the nature of this relationship remains uncertain. STUDY DESIGN: Cross-sectional cohort using baseline data from the Systolic Blood Pressure Intervention Trial (SPRINT). SETTING & PARTICIPANTS: Participants in SPRINT, a randomized clinical trial of blood pressure targets in older community-dwelling adults with cardiovascular disease, chronic kidney disease, or high cardiovascular disease risk and without diabetes or known stroke, who underwent detailed neurocognitive testing in the cognition substudy, SPRINT-Memory and Cognition in Decreased Hypertension (SPRINT-MIND)...
June 9, 2017: American Journal of Kidney Diseases: the Official Journal of the National Kidney Foundation
https://www.readbyqxmd.com/read/28562565/perivascular-epithelial-cell-tumor-pecoma-of-the-pancreas-a-case-report-and-review-of-literature
#7
Shuisheng Zhang, Fang Chen, Xiaozhun Huang, Qinglong Jiang, Yajie Zhao, Yingtai Chen, Jianwei Zhang, Jie Ma, Wei Yuan, Quan Xu, Jiuda Zhao, Chengfeng Wang
RATIONALE: Perivascular epithelial cell tumors (PEComas) of the pancreas are rare mesenchymal tumors and, to our knowledge, only 20 cases have been reported to date. PATIENT CONCERNS: We report a 43-year-old female who presented with upper abdominal pain for 1 year. She underwent an exploratory laparotomy at a local hospital, which failed to resect the tumor. Five months later, she came to the Chinese National Cancer Center for surgery. Preoperative imaging revealed an 11...
June 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28562205/diameter-of-the-pulmonary-artery-in-relation-to-the-ascending-aorta-association-with-cardiovascular-outcome
#8
Andreas A Kammerlander, Stefan Aschauer, Caroline Zotter-Tufaro, Franz Duca, Klaus Knechtelsdorfer, Matthias Wiesinger, Marianne L Schwaiger, Daniel Dalos, Matthias Schneider, Beatrice A Marzluf, Diana Bonderman, Julia Mascherbauer
Purpose To investigate whether the pulmonary artery (PA)-to-ascending aorta (Ao) ratio is associated with outcome in unselected patients referred for cardiac magnetic resonance (MR) imaging. Materials and Methods This study prospectively enrolled 650 consecutive patients (47.2% women; mean age, 56.1 years ± 17.7 [standard deviation]). Diameters of PA and Ao were measured in axial black blood images. On the basis of previous results, a PA-to-Ao ratio of 1.0 or greater was chosen as the cutoff for further analysis...
May 29, 2017: Radiology
https://www.readbyqxmd.com/read/28549310/segmentation-of-lumen-and-outer-wall-of-abdominal-aortic-aneurysms-from-3d-black-blood-mri-with-a-registration-based-geodesic-active-contour-model
#9
Yan Wang, Florent Seguro, Evan Kao, Yue Zhang, Farshid Faraji, Chengcheng Zhu, Henrik Haraldsson, Michael Hope, David Saloner, Jing Liu
Segmentation of the geometric morphology of abdominal aortic aneurysm is important for interventional planning. However, the segmentation of both the lumen and the outer wall of aneurysm in magnetic resonance (MR) image remains challenging. This study proposes a registration based segmentation methodology for efficiently segmenting MR images of abdominal aortic aneurysms. The proposed methodology first registers the contrast enhanced MR angiography (CE-MRA) and black-blood MR images, and then uses the Hough transform and geometric active contours to extract the vessel lumen by delineating the inner vessel wall directly from the CE-MRA...
May 19, 2017: Medical Image Analysis
https://www.readbyqxmd.com/read/28540464/comparison-of-lesion-enhancement-between-bb-cube-and-3d-spgr-images-for-brain-tumors-with-1-5-t-magnetic-resonance-imaging
#10
Hirokazu Hasegawa, Ryuichiro Ashikaga, Kaoru Okajima, Tetsuya Wakayama, Mitsuharu Miyoshi, Yasumasa Nishimura, Takamichi Murakami
PURPOSE: This study aimed to compare the detectability of neoplastic lesion enhancement after gadolinium-based contrast media injection in three-dimensional T1-weighted black blood Cube (3D-T1W BB Cube) and three-dimensional T1-weighted fast spoiled gradient-echo (3D-T1W fast SPGR) images obtained with 1.5-T magnetic resonance imaging (MRI). MATERIALS AND METHODS: Phantom and clinical studies were performed to compare the lesion detectability and contrast ratio (CR) between 3D-T1W BB Cube and 3D-T1W fast SPGR pulse sequences...
May 24, 2017: Japanese Journal of Radiology
https://www.readbyqxmd.com/read/28445914/clinical-significance-of-intraluminal-contrast-enhancement-in-patients-with-spontaneous-cervical-artery-dissection-a%C3%A2-black-blood-mri-study
#11
Eva Coppenrath, Olga Lenz, Nora Sommer, Nina Lummel, Jennifer Linn, Karla Treitl, Fabian Bamberg, Maximilian Reiser, Thomas Pfefferkorn, Tobias Saam
Purpose Recent studies have suggested that intraluminal thrombi show contrast enhancement on carotid black-blood T1w MRI. The aim of this study was to evaluate the significance of intraluminal contrast enhancement (iCE) regarding symptom status in patients with spontaneous cervical artery dissection (sCAD). Methods 33 consecutive patients (19 men) with sCAD received a brain MRI (DIFF, T2w, T2*w, FLAIR) and a multi-sequence 3T-MRI with fat-saturated high-resolution black-blood T1w-sequences pre- and post-contrast, contrast-enhanced MR angiography and TOF images of carotid and vertebral arteries...
July 2017: RöFo: Fortschritte Auf Dem Gebiete der Röntgenstrahlen und der Nuklearmedizin
https://www.readbyqxmd.com/read/28438710/a-purpose-built-neck-coil-for-black-blood-dante-prepared-carotid-artery-imaging-at-7t
#12
Konstantinos Papoutsis, Linqing Li, Jamie Near, Stephen Payne, Peter Jezzard
Atherosclerotic plaques in the bifurcation of the carotid arteries can pose a significant health risk due to possible plaque rupture and subsequent stroke. The assessment of plaques, and evaluation of the risk they pose, can be performed with Black-Blood (BB) vessel wall magnetic resonance imaging. However, resolution at standard clinical field strengths (up to 3T) is limited, hampering reliable assessment and diagnosis. The aim of this study was to investigate the benefits of 7T MRI using a BB application that has been successful at clinical field strengths...
July 2017: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/28422654/novel-mri-technique-enables-non-invasive-measurement-of-atrial-wall-thickness
#13
Marta Varela, Ross Morgan, Adeline Theron, Desmond Dillon-Murphy, Henry Chubb, John Whitaker, Markus Henningsson, Paul Aljabar, Tobias Schaeffter, Christoph Kolbitsch, Oleg V Aslanidi
Knowledge of atrial wall thickness (AWT) has the potential to provide important information for patient stratification and the planning of interventions in atrial arrhythmias. To date, information about AWT has only been acquired in post-mortem or poor-contrast CT studies, providing limited coverage and highly variable estimates of AWT. We present a novel contrast agent-free MRI sequence for imaging AWT and use it to create personalized AWT maps and a biatrial atlas. A novel black-blood phase-sensitive inversion recovery protocol was used to image 10 volunteers and 2 atrial fibrillation patients, as proof of concept...
April 13, 2017: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28395123/focused-ultrasound-as-a-novel-strategy-for-alzheimer-disease-therapeutics
#14
Ying Meng, Matthew Volpini, Sandra Black, Andres M Lozano, Kullervo Hynynen, Nir Lipsman
No abstract text is available yet for this article.
May 2017: Annals of Neurology
https://www.readbyqxmd.com/read/28350034/spectrophotometric-analysis-at-the-single-cell-level-elucidating-dispersity-within-melanic-immortalized-cell-populations
#15
Luis Polo-Parada, Gerardo Gutiérrez-Juárez, David Cywiak, Rafael Pérez-Solano, Gary A Baker
It is widely held that the melanosome is an exemplar of the absorption features of melanin-containing cells, which are assumed to be uniform in both size and optical characteristics. In recent years, however, it has become increasingly apparent that this is a strikingly poor assumption. Indeed, melanin extracted from natural sources and synthetic melanin both show wide variability in their degree of polymerization (molecular weight) and spectroscopic characteristics. In the current study, imaging spectrophotometry performed on individual cells of immortalized melanin-producing cell lines revealed broad distributions in their sizes: 9...
May 2, 2017: Analyst
https://www.readbyqxmd.com/read/28327475/free-breathing-black-blood-cine-fast-spin-echo-imaging-for-measuring-abdominal-aortic-wall-distensibility-a-feasibility-study
#16
Jyh-Miin Lin, Andrew J Patterson, Tzu-Cheng Chao, Chengcheng Zhu, Hing-Chiu Chang, Jason Mendes, Hsiao-Wen Chung, Jonathan H Gillard, Martin J Graves
The paper reports a free-breathing black-blood CINE fast-spin echo (FSE) technique for measuring abdominal aortic wall motion. The free-breathing CINE FSE includes the following MR techniques: (1) variable-density sampling with fast iterative reconstruction; (2) inner-volume imaging; and (3) a blood-suppression preparation pulse. The proposed technique was evaluated in eight healthy subjects. The inner-volume imaging significantly reduced the intraluminal artifacts of respiratory motion (p  =  0.015)...
May 21, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28327196/primary-hepatic-angiomyolipoma-immunohistochemistry-and-electron-microscopic-observations-a-case-report
#17
Hidefumi Kubo, Hitoshi Yamazaki, Takemichi Okada, Yoshihito Takahashi, Yatsushi Nishi, Hiroaki Yokomori
BACKGROUND: Hepatic angiomyolipomas are a rare, benign group of mesenchymal tumors in the liver. Hepatic angiomyolipoma is sometimes misdiagnosed as hepatocellular carcinoma, and there is the possibility of a malignant transformation. Hence, the accurate diagnosis of this disorder is necessary. CASE PRESENTATION: A 64-year-old Japanese man was observed to have a space-occupying lesion of 15-mm diameter in the liver during a follow-up examination for a previously resected cecal carcinoma...
March 22, 2017: Journal of Medical Case Reports
https://www.readbyqxmd.com/read/28314627/n-%C3%AE%C2%B5-carboxymethyl-lysine-concentration-in-debris-from-carotid-artery-stenting-correlates-independently-with-signal-intensity-on-t1-weighted-black-blood-magnetic-resonance-images
#18
Ayumu Eto, Noriyuki Sakata, Ryoji Nagai, Jun-Ichi Shirakawa, Ritsurou Inoue, Fumiaki Kiyomi, Kouhei Nii, Hiroshi Aikawa, Minoru Iko, Masanori Tsutsumi, Kimiya Sakamoto, Fumihiro Hiraoka, Takahumi Mitsutake, Hayatsura Hanada, Kiyoshi Kazekawa
BACKGROUND AND PURPOSE: Because magnetic resonance imaging (MRI) focuses on the morphological characteristics of carotid artery plaques, its diagnostic value with respect to plaque vulnerability is limited. We examined the correlation between N(ε)-(carboxymethyl)lysine (CML), a main chemical structure of advanced glycation end-products, and the vulnerability of plaques visualized on MRI scans. MATERIALS AND METHODS: We enrolled 43 patients who had undergone carotid artery stenting (CAS) for carotid artery stenosis; all underwent MRI studies, including black-blood MRI and diffusion-weighted imaging (DWI)...
March 14, 2017: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
https://www.readbyqxmd.com/read/28288506/hepatic-perivascular-epithelioid-cell-tumor-pecoma-a-case-report-with-a-review-of-literatures
#19
REVIEW
Hyun-Jin Son, Dong Wook Kang, Joo Heon Kim, Hyun Young Han, Min Koo Lee
Hepatic perivascular epithelioid cell tumors (PEComas) are very rare. We report a primary hepatic PEComa with a review of the literature. A 56-year-old women presented with a nodular mass detected during the management of chronic renal failure and chronic hepatitis C. Diagnostic imaging studies suggested a nodular hepatocellular carcinoma in segment 5 of the liver. The patient underwent partial hepatectomy. A brown-colored expansile mass measuring 3.2×3.0 cm was relatively demarcated from the surrounding liver parenchyma...
March 2017: Clinical and Molecular Hepatology
https://www.readbyqxmd.com/read/28270208/aortic-length-measurements-for-pulse-wave-velocity-calculation-manual-2d-vs-automated-3d-centreline-extraction
#20
Arna van Engelen, Miguel Silva Vieira, Isma Rafiq, Marina Cecelja, Torben Schneider, Hubrecht de Bliek, C Alberto Figueroa, Tarique Hussain, Rene M Botnar, Jordi Alastruey
BACKGROUND: Pulse wave velocity (PWV) is a biomarker for the intrinsic stiffness of the aortic wall, and has been shown to be predictive for cardiovascular events. It can be assessed using cardiovascular magnetic resonance (CMR) from the delay between phase-contrast flow waveforms at two or more locations in the aorta, and the distance on CMR images between those locations. This study aimed to investigate the impact of different distance measurement methods on PWV. We present and evaluate an algorithm for automated centreline tracking in 3D images, and compare PWV calculations using distances derived from 3D images to those obtained from a conventional 2D oblique-sagittal image of the aorta...
March 8, 2017: Journal of Cardiovascular Magnetic Resonance
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