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Magnetic Resonance in Medical Sciences: MRMS

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https://read.qxmd.com/read/30745546/early-experience-with-mri-ultrasound-fusion-guided-prostate-biopsy-in-japanese-men-with-elevated-psa-levels
#1
Tsutomu Tamada, Yoshiyuki Miyaji, Naoki Kanomata, Ayumu Kido, Akira Yamamoto, Teruki Sone
No abstract text is available yet for this article.
February 8, 2019: Magnetic Resonance in Medical Sciences: MRMS
https://read.qxmd.com/read/30726800/mr-imaging-properties-of-ex-vivo-common-marmoset-brain-after-formaldehyde-fixation
#2
Yawara Haga, Junichi Hata, Akiko Uematsu, Fumiko Seki, Yuji Komaki, Mai Mizumura, Marin Nishio, Takaaki Kaneko, Noriyuki Kishi, Hideyuki Okano, Akira Furukawa
PURPOSE: Ex vivo brains have different MRI properties than in vivo brains because of chemical changes caused by fixative solutions, which change the signal intensity and/or tissue contrast on MR images. In this study, we investigated and compared the MRI properties of in vivo and ex vivo brains. METHODS: Using a Bruker 9.4T experimental scanner unit for animals (Biospin GmbH, Ettlingen, Germany), we performed this study on the common marmoset. We measured the relaxation and diffusion values in the white matter and cortex of common marmosets and compared these values between in vivo brains (n = 20) and ex vivo brains (n = 20)...
February 7, 2019: Magnetic Resonance in Medical Sciences: MRMS
https://read.qxmd.com/read/30700660/evaluation-of-the-knees-of-asymptomatic-kangoo-jumpers-with-mr-imaging
#3
Barış Polat, Deniz Aydın, Ayşe Esin Polat, Tahsin Gürpınar, Ramadan Özmanevra, Mehmet Alp Dirik
PURPOSE: The aim of this study is to determine the prevalence of pathologic findings in asymptomatic knees of Kangoo Jumpers by using a 3T MRI and to compare them with age and sex-matched controls who do not regularly participate in any impact sports. METHODS: Both knees of 18 Kangoo Jumpers were examined by 3T MRIs in a total of 36 MRI scans. The control group was comprised of 20 volunteers from the same age group and with similar weights who did not participate in any competitive sports, in a total of 40 MRI scans...
January 31, 2019: Magnetic Resonance in Medical Sciences: MRMS
https://read.qxmd.com/read/30700659/steroid-cell-ovarian-tumor-in-a-case-of-von-hippel-lindau-disease-demonstrating-lipid-content-of-the-mass-with-mr-imaging
#4
Ajaykumar C Morani, Ahmad Iyad Mubarak, Hrishabh R Bhosale, Nisha S Ramani, Steven G Waguespack, Anita Ying
No abstract text is available yet for this article.
January 31, 2019: Magnetic Resonance in Medical Sciences: MRMS
https://read.qxmd.com/read/30555108/improving-the-quality-of-diffusion-weighted-imaging-of-the-left-hepatic-lobe-using-weighted-averaging-of-signals-from-multiple-excitations
#5
Shintaro Ichikawa, Utaroh Motosugi, Daiki Tamada, Tetsuya Wakayama, Kazuyuki Sato, Satoshi Funayama, Hiroshi Onishi
BACKGROUND: Diffusion-weighted imaging (DWI) is useful for detecting and characterizing liver lesions but is sensitive to organ motion artifact, especially in the left lobe. PURPOSE: To assess the signal intensity (SI) loss in the left hepatic lobe on DWI depending on motion-proving gradient (MPG) pulse direction (preliminary study) and to evaluate the usefulness of modified signal averaging to reduce the SI loss on DWI (application study). METHODS: About 48 (preliminary) and 35 (application) patients were included...
December 14, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://read.qxmd.com/read/30518735/a-pitfall-for-diffusion-weighted-mr-imaging-when-assessing-the-response-to-neoadjuvant-chemotherapy-in-ewing-sarcoma
#6
Ömer Kasalak, Albert J H Suurmeijer, Jacco J De Haan, Hugo J A Adams, Paul C Jutte, Thomas C Kwee
No abstract text is available yet for this article.
December 6, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://read.qxmd.com/read/30518734/regression-of-white-matter-hyperintensity-after-indirect-bypass-surgery-in-a-patient-with-moyamoya-disease
#7
Shoko Hara, Masaaki Hori, Motoki Inaji, Taketoshi Maehara, Shigeki Aoki, Tadashi Nariai
No abstract text is available yet for this article.
December 6, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://read.qxmd.com/read/30518733/improved-visualization-of-middle-ear-cholesteatoma-with-computed-diffusion-weighted-imaging
#8
Koji Yamashita, Akio Hiwatashi, Osamu Togao, Kazufumi Kikuchi, Yamato Shimomiya, Ryotaro Kamei, Daichi Momosaka, Nozomu Matsumoto, Kouji Kobayashi, Atsushi Takemura, Thomas Christian Kwee, Taro Takahara, Hiroshi Honda
Computed DWI (cDWI) is a mathematical technique that calculates arbitrary higher b value images from at least two different lower b values. In addition, the removal of high intensity noise with image processing on cDWI could improve cholesteatoma-background contrast-to-noise ratio (CNR). In the present study, noise reduction was performed by the cut-off values of apparent diffusion coefficient (ADC) less than 0 and 0.4 × 10-3 s/mm2 . The cholesteatoma to non-cholesteatoma CNR was increased using a noise reduction algorithm for clinical setting...
December 6, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://read.qxmd.com/read/30504640/a-comparison-of-techniques-for-correcting-eddy-current-and-motion-induced-distortions-in-diffusion-weighted-echo-planar-images
#9
Jun Haneda, Akifumi Hagiwara, Masaaki Hori, Akihiko Wada, Issei Fukunaga, Katsutoshi Murata, Koji Kamagata, Shohei Fujita, Tomoko Maekawa, Ryusuke Irie, Tomohiro Takamura, Michimasa Suzuki, Kanako Kunishima Kumamaru, Shigeki Aoki
The purpose of this study was to show the efficacy of dynamic field correction (DFC), a technique provided by the scanner software, in comparison to the FMRIB Software Library (FSL) post-processing "eddy" tool. DFC requires minimal additional scan time for the correction of eddy-current and motion-induced geometrical image distortions in diffusion-weighted echo-planar images. The fractional anisotropy derived from images corrected with DFC were comparable to images corrected with the "eddy" tool and significantly higher than images without correction, which demonstrates the utility of DFC...
December 3, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://read.qxmd.com/read/30504639/differentiating-alzheimer-s-disease-from-dementia-with-lewy-bodies-using-a-deep-learning-technique-based-on-structural-brain-connectivity
#10
Akihiko Wada, Kohei Tsuruta, Ryusuke Irie, Koji Kamagata, Tomoko Maekawa, Shohei Fujita, Saori Koshino, Kanako Kumamaru, Michimasa Suzuki, Atsushi Nakanishi, Masaaki Hori, Shigeki Aoki
PURPOSE: Alzheimer's disease (AD) and dementia with Lewy bodies (DLB) are representative disorders of dementia of the elderly and the neuroimaging has contributed to early diagnosis by estimation of alterations of brain volume, blood flow and metabolism. A brain network analysis by MR imaging (MR connectome) is a recently developed technique and can estimate the dysfunction of the brain network in AD and DLB. A graph theory which is a major technique of network analysis is useful for a group study to extract the feature of disorders, but is not necessarily suitable for the disorder differentiation at the individual level...
December 3, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://read.qxmd.com/read/30504638/imaging-of-cystic-lung-lesions-in-infants-using-pointwise-encoding-time-reduction-with-radial-acquisition-petra
#11
Kumiko Nozawa, Tetsu Niwa, Noriko Aida
No abstract text is available yet for this article.
December 3, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://read.qxmd.com/read/30449822/t-2-distribution-in-the-forearm-muscles-and-the-t-2-threshold-for-defining-activated-muscle
#12
Masayoshi Takamori, Sumikazu Akiyama, Kazuya Yoshida, Hidefumi Wakashin, Yoshiteru Seo
PURPOSE: In order to detect exercised muscles by the increase in T2 , we have defined a Gaussian T2 distribution and reference values (T2r and SDr ) in resting state muscles, and a threshold for detecting exercised muscles. METHODS: The subjects were healthy adult volunteers (14 males and 12 females). Multiple-spin-echo (MSE) MR images were obtained with 10 TE values from 10 to 100 ms using a 0.2T MRI system. T2 values for 10 forearm muscles were obtained in the resting state and after isometric wrist flexion exercise with 5%, 15%, and 25% of the maximum voluntary contraction (MVC)...
November 19, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://read.qxmd.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
#13
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://read.qxmd.com/read/30416180/a-fast-gpu-optimized-3d-mri-simulator-for-arbitrary-k-space-sampling
#14
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://read.qxmd.com/read/30416179/impact-of-the-number-of-iterations-in-compressed-sensing-reconstruction-on-ultrafast-dynamic-contrast-enhanced-breast-mr-imaging
#15
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://read.qxmd.com/read/30416178/diffusion-tensor-imaging-of-the-brachial-plexus-a-comparison-between-readout-segmented-and-conventional-single-shot-echo-planar-imaging
#16
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://read.qxmd.com/read/30416177/usefulness-of-mr-imaging-in-idiopathic-oculomotor-nerve-palsy-cases-t-2-weighted-ideal
#17
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://read.qxmd.com/read/30404979/mesenteroaxial-gastric-volvulus-diagnosed-with-mr-imaging-during-the-early-stages-of-pregnancy
#18
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://read.qxmd.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
#19
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://read.qxmd.com/read/30393277/mr-imaging-of-a-leiomyosarcoma-arising-in-leiomyoma
#20
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
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