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Magnetic Resonance in Medical Sciences: MRMS

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https://www.readbyqxmd.com/read/29343661/immobilization-technique-for-high-resolution-mr-imaging-of-the-testes
#1
Masayuki Yamaguchi, Hirofumi Fujii
Techniques for testis immobilization can facilitate high-resolution MR imaging applications for testicular diseases by assuring good positioning of the testis on small radiofrequency coils and reducing motion artifacts. We tested negative pressure suction to immobilize the testis of rats during MR image acquisitions. Suction pressure between -5 and -10 kPa assured good positioning, suppressed motion artifacts, and allowed the observation of blood vessels and seminiferous tubules.
January 18, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/29343660/mr-guided-focused-ultrasound-for-uterine-fibroids-a-preliminary-study-of-relationship-between-the-treatment-outcomes-and-factors-of-mr-images-including-elastography
#2
Shintaro Ichikawa, Utaroh Motosugi, Makiko Omori, Katsuhiro Sano, Yoshie Omiya, Shuji Hirata, Hiroshi Onishi
We evaluated the value of magnetic resonance elastography (MRE) for the prediction of response to magnetic resonance-guided focused ultrasound (MRgFUS) for uterine fibroids. Eleven patients were enrolled. A fractional change of >30% in Symptoms Severity Score (SSS) was defined as a 'substantial symptomatic improvement' at 12 months after treatment. The fractional stiffness value reduction in the patients with a substantial improvement in SSS was significantly higher than that in those without (P = 0.0446)...
January 18, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/29343659/cardiac-mr-imaging-of-hypertrophic-cardiomyopathy-techniques-findings-and-clinical-relevance
#3
Yasuo Amano, Mitsunobu Kitamura, Hitoshi Takano, Fumi Yanagisawa, Masaki Tachi, Yasuyuki Suzuki, Shinichiro Kumita, Morimasa Takayama
Hypertrophic cardiomyopathy (HCM) is a relatively common myocardial genetic disease having a wide variety of symptoms and prognoses. The most serious complications of HCM are sudden cardiac death induced by ventricular arrhythmia or inappropriate changes in blood pressure, and heart failure. Cardiac MR imaging is a valuable imaging method for detecting HCM because of its accurate measurement of wall thickness and myocardial mass without limited view and the unique ability of late gadolinium enhancement (LGE) to identify myocardial fibrosis related to the prognosis of HCM...
January 18, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/29343658/differences-in-signal-intensity-and-enhancement-on-mr-images-of-the-perivascular-spaces-in-the-basal-ganglia-versus-those-in-white-matter
#4
Shinji Naganawa, Toshiki Nakane, Hisashi Kawai, Toshiaki Taoka
PURPOSE: To elucidate differences between the perivascular space (PVS) in the basal ganglia (BG) versus that found in white matter (WM) using heavily T2-weighted FLAIR (hT2-FL) in terms of 1) signal intensity on non-contrast enhanced images, and 2) the degree of contrast enhancement by intravenous single dose administration of gadolinium based contrast agent (IV-SD-GBCA). MATERIALS AND METHODS: Eight healthy men and 13 patients with suspected endolymphatic hydrops were included...
January 18, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/29343657/combining-segmented-grey-and-white-matter-images-improves-voxel-based-morphometry-for-the-case-of-dilated-lateral-ventricles
#5
Masami Goto, Osamu Abe, Shigeki Aoki, Koji Kamagata, Masaaki Hori, Tosiaki Miyati, Tsutomu Gomi, Tohoru Takeda
PURPOSE: To evaluate the error in segmented tissue images and to show the usefulness of the brain image in voxel-based morphometry (VBM) using Statistical Parametric Mapping (SPM) 12 software and 3D T1-weighted magnetic resonance images (3D-T1WIs) processed to simulate idiopathic normal pressure hydrocephalus (iNPH). MATERIALS AND METHODS: VBM analysis was performed on sagittal 3D-T1WIs obtained in 22 healthy volunteers using a 1.5T MR scanner. Regions of interest for the lateral ventricles of all subjects were carefully outlined on the original 3D-T1WIs, and two types of simulated 3D-T1WI were also prepared (non-dilated 3D-T1WI as normal control and dilated 3D-T1WI to simulate iNPH)...
January 18, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/29332926/differentiating-between-alzheimer-disease-patients-and-controls-with-phase-difference-enhanced-imaging-at-3t-a-feasibility-study
#6
Machiko Tateishi, Mika Kitajima, Toshinori Hirai, Tetsuya Yoneda, Mamoru Hashimoto, Nan Kurehana, Hiroyuki Uetani, Ryuji Fukuhara, Minako Azuma, Yasuyuki Yamashita
PURPOSE: To test the feasibility of the phase difference enhanced (PADRE) imaging for differentiation between Alzheimer disease (AD) patients and control subjects on 3T MR imaging. MATERIALS AND METHODS: Fifteen patients with AD and 10 age-matched control subjects underwent two-dimensional fast field echo imaging to obtain PADRE images on a 3T MR scanner. A double Gaussian distribution model was used to determine the threshold phase value for differentiation between the physiologic and non-physiologic iron in the cerebral cortices, and PADRE images were processed with the threshold...
January 15, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/29238007/diagnostic-performance-of-arterial-spin-labeling-for-grading-nonenhancing-astrocytic-tumors
#7
Delgerdalai Khashbat, Masafumi Harada, Takashi Abe, Mungunbagana Ganbold, Seiji Iwamoto, Naoto Uyama, Saho Irahara, Youichi Otomi, Teruyoshi Kageji, Shinji Nagahiro
PURPOSE: We evaluated the utility of arterial spin labeling (ASL) imaging of tumor blood flow (TBF) for grading non-enhancing astrocytic tumors. MATERIALS AND METHODS: Thirteen non-enhancing astrocytomas were divided into high-grade (n = 7) and low-grade (n = 6) groups. Both ASL and conventional sequences were acquired using the same magnetic resonance machine. Intratumoral absolute maximum TBF (TBFmax), absolute mean TBF (TBFmean), and corresponding values normalized to cerebral blood flow (TBFmax and TBFmean ratios) were measured...
December 12, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/29238006/detection-of-cerebral-venous-sinus-thrombosis-on-a-r2-map
#8
Yuki Shinohara, Ayumi Kato, Eijiro Yamashita, Jun-Ichi Ueyama, Naohiro Yoneda, Toshihide Ogawa
No abstract text is available yet for this article.
December 12, 2017: 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
#9
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.
December 12, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/29213008/the-relationship-between-neurite-density-measured-with-confocal-microscopy-in-a-cleared-mouse-brain-and-metrics-obtained-from-diffusion-tensor-and-diffusion-kurtosis-imaging
#10
Ryusuke Irie, Koji Kamagata, Aurelien Kerever, Ryo Ueda, Suguru Yokosawa, Yosuke Otake, Hisaaki Ochi, Hidekazu Yoshizawa, Ayato Hayashi, Kazuhiko Tagawa, Hitoshi Okazawa, Kohske Takahashi, Kanako Sato, Masaaki Hori, Eri Arikawa-Hirasawa, Shigeki Aoki
PURPOSE: Diffusional kurtosis imaging (DKI) enables sensitive measurement of tissue microstructure by quantifying the non-Gaussian diffusion of water. Although DKI is widely applied in many situations, histological correlation with DKI analysis is lacking. The purpose of this study was to determine the relationship between DKI metrics and neurite density measured using confocal microscopy of a cleared mouse brain. METHODS: One thy-1 yellow fluorescent protein 16 mouse was deeply anesthetized and perfusion fixation was performed...
December 7, 2017: 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
#11
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...
December 7, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/29212957/comparison-of-glass-capillary-plates-and-polyethylene-fiber-bundles-as-phantoms-to-assess-the-quality-of-diffusion-tensor-imaging
#12
Atsushi Tachibana, Yasuhiko Tachibana, Jeff Kershaw, Hiromi Sano, Masahiro Fukushi, Takayuki Obata
PURPOSE: The purpose of this study was to evaluate the suitability of two phantoms, one made of capillary plates and the other polyethylene fibers, for assessing the quality of diffusion tensor imaging (DTI). METHODS: The first phantom was a stack of glass capillary plates with many parallel micropores (CP). The second phantom was a bundle of polyethylene fiber Dyneema held together with a thermal shrinkage tube (Dy). High resolution multi-shot echo planar imaging (EPI) DTI acquisitions were performed at b-values of 0 and 1000 s/mm2 and diffusion-times (Tdiff) of 37...
December 5, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/29187679/cardiac-driven-pulsatile-motion-of-intracranial-cerebrospinal-fluid-visualized-based-on-a-correlation-mapping-technique
#13
Satoshi Yatsushiro, Saeko Sunohara, Naokazu Hayashi, Akihiro Hirayama, Mitsunori Matsumae, Hideki Atsumi, Kagayaki Kuroda
PURPOSE: A correlation mapping technique delineating delay time and maximum correlation for characterizing pulsatile cerebrospinal fluid (CSF) propagation was proposed. After proofing its technical concept, this technique was applied to healthy volunteers and idiopathic normal pressure hydrocephalus (iNPH) patients. METHODS: A time-resolved three dimensional-phase contrast (3D-PC) sampled the cardiac-driven CSF velocity at 32 temporal points per cardiac period at each spatial location using retrospective cardiac gating...
November 29, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/29187678/additive-value-of-3t-3d-ciss-imaging-to-conventional-mri-for-assessing-the-abnormal-vessels-of-spinal-dural-arteriovenous-fistulae
#14
Hiroyuki Uetani, Toshinori Hirai, Mika Kitajima, Minako Azuma, Shigetoshi Yano, Hideo Nakamura, Keishi Makino, Yutaka Kai, Yasunori Nagayama, Yoshihito Kadota, Yasuyuki Yamashita
INTRODUCTION: We investigated the additive value of the 3T three-dimensional (3D) constructive interference in steady state (CISS) sequence to conventional magnetic resonance imaging (MRI) for the evaluation of spinal dural arteriovenous fistulae (SDAVF). MATERIALS AND METHODS: We included 16 consecutive patients (15 men, 1 woman; age range 42-81 years; mean 64 years) with SDAVF who underwent 3T MRI and digital subtraction angiography (DSA) before treatment. Two neuroradiologists independently evaluated the presence of abnormal vessels on 3D CISS-, T2- and T1-weighted images (T1WI, T2WI), and contrast-enhanced T1WI using a 3-point grading system...
November 29, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/29142152/indirect-proton-mr-imaging-and-kinetic-analysis-of-17-o-labeled-water-tracer-in-the-brain
#15
Kohsuke Kudo, Taisuke Harada, Hiroyuki Kameda, Ikuko Uwano, Fumio Yamashita, Satomi Higuchi, Kunihiro Yoshioka, Makoto Sasaki
PURPOSE: The feasibility of steady-state sequences for (17)O imaging was evaluated based on a kinetic analysis of the brain parenchyma and cerebrospinal fluid (CSF). MATERIALS AND METHODS: The institutional review board approved this prospective study with written informed consent. Dynamic 2D or 3D steady-state sequences were performed in five and nine participants, respectively, with different parameters using a 3T scanner. During two consecutive dynamic scans, saline was intravenously administered for control purposes in the first scan, and 20% (17)O-labeled water (1 mL/Kg) was administered in the second scan...
November 16, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/29129844/spatial-restriction-within-intracranial-epidermoid-cysts-observed-using-short-diffusion-time-diffusion-weighted-imaging
#16
Christina Andica, Masaaki Hori, Kouhei Kamiya, Saori Koshino, Akifumi Hagiwara, Koji Kamagata, Issei Fukunaga, Nozomi Hamasaki, Michimasa Suzuki, Thorsten Feiweier, Katsutoshi Murata, Atsushi Arakawa, Kondo Akihide, Osamu Akiyama, Shigeki Aoki
We report two cases of pathologically proven intracranial epidermoid cysts. Both cases were scanned with diffusion-weighted imaging using pulsed gradient spin-echo (PGSE) and oscillating gradient spin-echo (OGSE; 50 Hz) prototype sequences with diffusion times of 47.3 ms and 8.5 ms, respectively. The apparent diffusion coefficient measured by OGSE was higher than that measured by PGSE, indicating the spatial restriction of water diffusion in the laminated keratin layers within the cyst as demonstrated by histopathology...
November 13, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/29129843/large-arterial-ring-formed-between-the-m1-and-m2-segments-of-the-right-middle-cerebral-artery-diagnosed-with-mr-angiography
#17
Haruomi Yamaguchi, Akira Uchino, Naoko Saito, Ichiro Deguchi, Masaki Takao
No abstract text is available yet for this article.
November 13, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/29118306/quantitation-error-in-1-h-mrs-caused-by-b1-inhomogeneity-and-chemical-shift-displacement
#18
Hidehiro Watanabe, Nobuhiro Takaya
PURPOSE: The quantitation accuracy in proton magnetic resonance spectroscopy ((1)H MRS) improves at higher B0 field. However, a larger chemical shift displacement (CSD) and stronger B1 inhomogeneity exist. In this work, we evaluate the quantitation accuracy for the spectra of metabolite mixtures in phantom experiments at 4.7T. We demonstrate a position-dependent error in quantitation and propose a correction method by measuring water signals. MATERIALS AND METHODS: All experiments were conducted on a whole-body 4...
November 8, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28993563/mri-findings-consistent-with-peripatellar-fat-pad-impingement-how-much-related-to-patellofemoral-maltracking
#19
Mohamed Jarraya, Luis E Diaz, Frank W Roemer, William F Arndt, Ajay R Goud, Ali Guermazi
Peripatellar fat pads are intracapsular extrasynovial adipose cushions that accommodate the changing shape and volume of articular spaces during movement. Variations in bone geometry, passive and active stabilization mechanisms and/or functional demands may lead to peripatellar fat pad abnormalities. While peripatellar fat pads may be affected a variety of conditions such as synovial inflammation, tumor and fibrosis, a mechanical origin should also be considered. Commonly, the clinical term "impingement" is used synonymously in the radiological literature to refer to three distinct entities of structural peripatellar fat pad abnormalities: superolateral the infrapatellar fat pad (Hoffa fat pad) edema, suprapatellar fat pad edema, and prepatellar fat pad edema, implying a mechanical origin of these conditions...
October 10, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28566585/ovarian-large-cell-neuroendocrine-carcinoma-associated-with-serous-carcinoma-correlation-of-pathology-with-mr-imaging
#20
Mayumi Takeuchi, Kenji Matsuzaki, Koichi Tsuneyama, Masato Nishimura, Eri Takiguchi, Masafumi Harada
No abstract text is available yet for this article.
October 10, 2017: Magnetic Resonance in Medical Sciences: MRMS
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