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Magnetic Resonance in Medical Sciences: MRMS

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https://www.readbyqxmd.com/read/30416181/signal-intensity-of-the-cerebrospinal-fluid-after-intravenous-administration-of-gadolinium-based-contrast-agents-strong-contrast-enhancement-around-the-vein-of-labbe
#1
Toshio Ohashi, Shinji Naganawa, Eriko Ogawa, Toshio Katagiri, Kayao Kuno
PURPOSE: Since the first report on the deposition of gadolinium in the brain parenchyma after repeated intravenous administrations of gadolinium-based contrast agent GBCA (IV-GBCA), the mechanisms of penetration and retention are still remaining a hot topic of discussion and a target of investigation. We routinely obtain endolymphatic hydrops (EH) images at 4 h after IV administration of a single dose (SD) of GBCA (IV-SD-GBCA) using heavily T2 -weighted three-dimensional fluid-attenuated inversion recovery imaging (hT2 W-3D-FLAIR)...
November 9, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/30416180/a-fast-gpu-optimized-3d-mri-simulator-for-arbitrary-k-space-sampling
#2
Ryoichi Kose, Ayana Setoi, Katsumi Kose
PURPOSE: To develop a fast 3D MRI simulator for arbitrary k-space sampling using a graphical processing unit (GPU) and demonstrate its performance by comparing simulation and experimental results in a real MRI system. MATERIALS AND METHODS: A fast 3D MRI simulator using a GeForce GTX 1080 GPU (NVIDIA Corporation, Santa Clara, CA, USA) was developed using C++ and the CUDA 8.0 platform (NVIDIA Corporation). The unique advantage of this simulator was that it could use the same pulse sequence as used in the experiment...
November 9, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/30416179/impact-of-the-number-of-iterations-in-compressed-sensing-reconstruction-on-ultrafast-dynamic-contrast-enhanced-breast-mr-imaging
#3
Hajime Sagawa, Masako Kataoka, Shotaro Kanao, Natsuko Onishi, Marcel Dominik Nickel, Masakazu Toi, Kaori Togashi
PURPOSE: To assess the impact of the number of iterations of compressed sensing (CS) reconstruction on the kinetic parameters and image quality in dynamic contrast-enhanced (DCE)-MRI of the breast, with prospectively undersampled CS-accelerated scans. MATERIALS AND METHODS: Breast examinations including ultrafast DCE-MRI using CS were conducted for 21 patients. Images were reconstructed with different numbers of iterations. The peak enhancement ratio of the aorta and wash-in slope, initial area under the curve, and Ktrans of the breast lesions were measured...
November 9, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/30416178/diffusion-tensor-imaging-of-the-brachial-plexus-a-comparison-between-readout-segmented-and-conventional-single-shot-echo-planar-imaging
#4
Michael J Ho, Alexander Ciritsis, Andrei Manoliu, Bram Stieltjes, Magda Marcon, Gustav Andreisek, Felix Pierre Kuhn
PURPOSE: Diffusion tensor imaging (DTI) adds functional information to morphological magnetic resonance neurography (MRN) in the assessment of the brachial nerve plexus. To determine the most appropriate pulse sequence in scan times suited for diagnostic imaging in clinical routine, we compared image quality between simultaneous multi-slice readout-segmented (rs-DTI) and conventional single-shot (ss-DTI) echo-planar imaging techniques. METHODS: Institutional Review Board (IRB) approved study including 10 healthy volunteers...
November 9, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/30416177/usefulness-of-mr-imaging-in-idiopathic-oculomotor-nerve-palsy-cases-t-2-weighted-ideal
#5
Hideki Nakajima, Masakatsu Motomura, Minoru Morikawa, Takao Ando, Atsushi Kawakami, Akira Tsujino
No abstract text is available yet for this article.
November 9, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/30404979/mesenteroaxial-gastric-volvulus-diagnosed-with-mr-imaging-during-the-early-stages-of-pregnancy
#6
Akitoshi Inoue, Hiroo Mizuta, Akihiko Ito, Tomoyuki Tsujikawa, Akira Furukawa, Kiyoshi Murata
No abstract text is available yet for this article.
November 6, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/30393275/age-dependence-of-gadolinium-leakage-from-the-cortical-veins-into-the-cerebrospinal-fluid-assessed-with-whole-brain-3d-real-inversion-recovery-mr-imaging
#7
Shinji Naganawa, Toshiki Nakane, Hisashi Kawai, Toshiaki Taoka
PURPOSE: It has been reported that intravenously administered gadolinium-based contrast agents (IV-GBCAs) leak into the cerebrospinal fluid (CSF) even in healthy subjects. The purpose of this study was to evaluate GBCA leakage from the cortical veins in patients with delayed imaging after IV-GBCA. MATERIALS AND METHODS: There are two parts of retrospective study. In the first part, we reviewed six patients with suspected endolymphatic hydrops (EH) who received a single dose of IV-GBCA (37-58 years old)...
November 5, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/30393277/mr-imaging-of-a-leiomyosarcoma-arising-in-leiomyoma
#8
Shinya Fujii, Masaki Tsuda, Naoko Mukuda, Kanae Nosaka, Shinya Sato, Toshihide Ogawa
No abstract text is available yet for this article.
November 2, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/30318501/three-dimensional-pseudo-continuous-arterial-spin-labeling-using-turbo-spin-echo-with-pseudo-steady-state-readout-a-comparison-with-other-major-readout-methods
#9
Suzuko Aoike, Hiroyuki Sugimori, Noriyuki Fujima, Yuriko Suzuki, Yukie Shimizu, Akira Suwa, Kinya Ishizaka, Kohsuke Kudo
We evaluated 3D pseudo-continuous arterial spin labeling (pCASL) using turbo spin echo with a pseudo-steady-state (PSS) readout in comparison with the other major readout methods of 3D spiral and 2D echo-planar imaging (EPI). 3D-PSS produced cerebral blood flow (CBF) values well correlated to those of the 3D spiral readout. By visual evaluation, the image quality of 3D-PSS pCASL was superior to that of 2D-EPI. The 3D-PSS technique was suggested useful as pCASL readout.
October 12, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/30282879/in-vitro-and-in-vivo-detection-of-drug-induced-apoptosis-using-annexin-v-conjugated-ultrasmall-superparamagnetic-iron-oxide-uspio-a-pilot-study
#10
Akihiro Nishie, Osamu Togao, Chihiro Tamura, Mayumi Yamato, Kazuhiro Ichikawa, Satoshi Nohara, Yoshio Ito, Naoki Kato, Satoshi Yoshise, Hiroshi Honda
PURPOSE: To investigate the binding potential of newly developed Annexin V-conjugated ultrasmall superparamagnetic iron oxide (V-USPIO) for detection of drug-induced apoptosis in vitro and in vivo. METHODS: Apoptotic cells induced by camptothecin were incubated with or without Annexin V-USPIO at a concentration of 0.089 mmol Fe/L in vitro. T2 values of the two cell suspensions were measured by 0.47T nuclear magnetic resonance (NMR) spectrometer. Tumor-bearing mice were subjected to 1...
October 2, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/30270253/evaluation-of-red-degeneration-of-uterine-leiomyoma-with-susceptibility-weighted-mr-imaging
#11
Mayumi Takeuchi, Kenji Matsuzaki, Yoshimi Bando, Masafumi Harada
PURPOSE: Red degeneration of uterine leiomyoma (RDL) is a hemorrhagic infarction caused by peripheral venous thrombosis. The peripheral high-intensity rim on T1 -weighted MRI is characteristic for RDL; however, it may not be observed at all the phases of RDL. Susceptibility-weighted MR sequences (SWS) have exquisite sensitivity to blood products, and we hypothesized that the low-intensity rim due to the T2* shortening effects of blood products may be more clearly demonstrated on SWS. The purpose of this study is to evaluate the capability of SWS for the diagnosis of RDL...
October 1, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/30175804/clinical-imaging-of-glycogen-rich-clear-cell-carcinoma-of-the-breast-a-case-series-with-literature-review
#12
Na Lae Eun, Yoon Jin Cha, Eun Ju Son, Hye Mi Gweon, Jeong-Ah Kim, Ji Hyun Youk
Glycogen-rich clear cell carcinoma (GRCC) of the breast is a rare malignant tumor. Most previous reports focused on clinicopathologic findings of GRCC and imaging findings were not precisely described. Here, we report imaging findings of three cases of GRCC along with a literature review. GRCC of the breast was depicted as a mass with irregular or oval shape on mammography and complex cystic and solid composition or focal cystic change on ultrasound. GRCC showed internal high signal intensity on T2 -weighted MRI with rim enhancement after contrast injection...
August 31, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/30146532/a-small-granulosa-cell-tumor-of-the-ovary-incidentally-detected-on-diffusion-weighted-images
#13
Chie Inoue, Shinya Fujii, Kanae Nosaka, Naoko Mukuda, Takeru Fukunaga, Toshihide Ogawa
No abstract text is available yet for this article.
August 24, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/30135323/fibro-fatty-degeneration-in-hypertrophic-cardiomyopathy
#14
Kongkiat Chaikriangkrai, Mahi Ashwath
No abstract text is available yet for this article.
August 23, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/29238006/detection-of-cerebral-venous-sinus-thrombosis-on-a-r2-map
#15
Yuki Shinohara, Ayumi Kato, Eijiro Yamashita, Jun-Ichi Ueyama, Naohiro Yoneda, Toshihide Ogawa
No abstract text is available yet for this article.
October 10, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/29238005/the-advantage-of-synthetic-mri-for-the-visualization-of-anterior-temporal-pole-lesions-on-double-inversion-recovery-dir-phase-sensitive-inversion-recovery-psir-and-myelin-images-in-a-patient-with-cadasil
#16
Lauren Wallaert, Akifumi Hagiwara, Christina Andica, Masaaki Hori, Kazuo Yamashiro, Saori Koshino, Tomoko Maekawa, Koji Kamagata, Shigeki Aoki
No abstract text is available yet for this article.
October 10, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/30047496/assessment-of-coronary-flow-velocity-reserve-in-the-left-main-trunk-using-phase-contrast-mr-imaging-at-3t-comparison-with-15-o-labeled-water-positron-emission-tomography
#17
Yasuka Kikuchi, Masanao Naya, Noriko Oyama-Manabe, Osamu Manabe, Hiroyuki Sugimori, Kohsuke Kudo, Fumi Kato, Tadao Aikawa, Hiroyuki Tsutsui, Nagara Tamaki, Hiroki Shirato
PURPOSE: The aim of this study was to verify coronary flow velocity reserve (CFVR) on the left main trunk (LMT) in comparison with myocardial flow reserve (MFR) by 15 O-labeled water positron emission tomography (PET) (MFR-PET) in both the healthy adults and the patients with coronary artery disease (CAD), and to evaluate the feasibility of CFVR to detect CAD. METHODS: Eighteen healthy adults and 13 patients with CAD were evaluated. CFVR in LMT was estimated by 3T magnetic resonance imaging (MRI) with phase contrast technique...
July 26, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/30033996/hypointense-spleen-associated-with-severe-acute-pancreatitis-on-mr-imaging
#18
Yasuo Amano, Ryo Takagi, Fumi Yanagisawa, Chisato Ando
No abstract text is available yet for this article.
July 20, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/30012905/how-to-improve-the-conspicuity-of-breast-tumors-on-computed-high-b-value-diffusion-weighted-imaging
#19
Takayuki Tamura, Miyuki Takasu, Toru Higaki, Kazushi Yokomachi, Yuji Akiyama, Hiroomi Sumida, Yasushi Nagata, Kazuo Awai
PURPOSE: The aim of this study was to compare the tumor conspicuity on actual measured diffusion-weighted images (aDWIs) and computed DWI (cDWI) of human breast tumors and to examine, by use of a phantom, whether cDWI improves their conspicuity. MATERIALS AND METHODS: We acquired DWIs (b-value 0, 700, 1400, 2100, 2800, and 3500 s/mm2 ) of 148 women with breast tumors. cDWIs with b-values of 1400, 2100, 2800, and 3500 s/mm2 were calculated from aDWI scans where b = 0 and 700 s/mm2 ; the tumor signal-to-noise ratio (SNR) was compared at each b-value...
July 13, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/29213007/the-value-of-lesion-size-as-an-adjunct-to-the-bi-rads-mri-2013-descriptors-in-the-diagnosis-of-solitary-breast-masses
#20
Makiko Kawai, Masako Kataoka, Shotaro Kanao, Mami Iima, Natsuko Onishi, Akane Ohashi, Rena Sakaguchi, Masakazu Toi, Kaori Togashi
PURPOSE: This study aimed to evaluate the MRI findings of breast solitary masses in diagnostic procedures to decide the appropriate category based on American College of Radiology (ACR) BI-RADS-MRI 2013, with the focus on lesion size. METHODS: A retrospective review of 2,603 consecutive breast MRI reports identified 250 pathologically-proven solitary breast masses. Dynamic-contrast enhanced images and diffusion-weighted images were performed on a 3.0/1.5 Tesla Scanner with a 16/4 channel dedicated breast coil...
July 10, 2018: Magnetic Resonance in Medical Sciences: MRMS
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