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Magnetic Resonance in Medical Sciences: MRMS

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https://www.readbyqxmd.com/read/29142152/indirect-proton-mr-imaging-and-kinetic-analysis-of-17-o-labeled-water-tracer-in-the-brain
#1
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
#2
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
#3
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
#4
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
#5
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/28993546/differentiation-of-seromucinous-borderline-tumor-from-serous-borderline-tumor-on-mr-imaging
#6
Yasuhisa Kurata, Aki Kido, Yusaku Moribata, Kyoko Kameyama, Sachiko Minamiguchi, Ikuo Konishi, Kaori Togashi
PURPOSE: Seromucinous borderline tumor (SMBT) is a newly categorized ovarian tumor in the 2014 revised World Health Organization (WHO) classification. SMBT is similar to serous borderline tumor (SBT) on magnetic resonance imaging (MRI) reflecting their pathological findings. This study was conducted to demonstrate the usefulness of MRI findings and quantitative values for differentiating SMBT from SBT. METHODS: This retrospective study examined 23 lesions (20 patients) from SMBT and 26 lesions (22 patients) from SBT...
October 6, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28978812/superficial-siderosis-associated-with-a-spinal-dural-defect
#7
Toshitada Hiraka, Masafumi Kanoto, Yuki Toyoguchi, Ryousuke Igari, Takeo Kato, Takaaki Hosoya
No abstract text is available yet for this article.
October 3, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28966303/appearance-of-the-organum-vasculosum-of-the-lamina-terminalis-on-contrast-enhanced-mr-imaging
#8
Shinji Naganawa, Toshiaki Taoka, Hisashi Kawai, Masahiro Yamazaki, Kojiro Suzuki
PURPOSE: Circumventricular organs (CVOs) lack a blood brain barrier and are also called "brain windows". Among CVOs, the organum vasculosum of the lamina terminalis (OVLT) is an osmotic regulator involved in the release of vasopressin. In a previous study of healthy subjects, it was reported that contrast enhancement in the OVLT can be recognized in only 34% of 3 Tesla thin slice contrast-enhanced T1-weighted images. The purpose of this study was to evaluate the leakage of gadolinium contrast from the OVLT in healthy subjects using heavily T2-weighted three dimensional-fluid attenuated inversion recovery (3D-FLAIR) (HF) imaging...
September 29, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28966302/mr-imaging-of-xanthogranulomatous-oophoritis
#9
Minako Maruyama, Takeshi Yoshizako, Rika Yoshida, Noriyoshi Ishikawa, Satoru Kyo, Hajime Kitagaki
No abstract text is available yet for this article.
September 29, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28867760/in-vitro-study-of-serial-changes-to-carmustine-wafers-gliadel-with-mr-imaging-and-computed-tomography
#10
Satoshi Doishita, Taro Shimono, Tetsuya Yoneda, Eiji Yamada, Taro Tsukamoto, Daichi Takemori, Daisuke Kimura, Hiroyuki Tatekawa, Shinichi Sakamoto, Yukio Miki
PURPOSE: Implantation of carmustine wafers (Gliadel) in vivo is accompanied by characteristic serial changes on magnetic resonance imaging (MRI) and computed tomography (CT), such as transient hyperintensity of the wafers on T1-weighted images (T1WIs) and considerable gas accumulation in surgical resection cavities. The purpose of this study was to evaluate intrinsic imaging changes to carmustine wafers in vitro. METHODS: Three phantoms simulating a surgical resection cavity were constructed...
September 4, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28855470/technical-aspects-of-contrast-enhanced-mr-angiography-current-status-and-new-applications
#11
Stephen J Riederer, Eric G Stinson, Paul T Weavers
This article is based on a presentation at the meeting of the Japanese Society of Magnetic Resonance in Medicine in September 2016. The purpose is to review the technical developments which have contributed to the current status of contrast-enhanced magnetic resonance angiography (CE-MRA) and to indicate related emerging areas of study. Technical developments include magnetic resonance imaging (MRI) physics-based innovations as well as improvements in MRI engineering. These have collectively addressed not only early issues of timing and venous suppression but more importantly have led to an improvement in spatiotemporal resolution of CE-MRA of more than two orders of magnitude compared to early results...
August 31, 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
#12
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
https://www.readbyqxmd.com/read/28190853/high-snr-acquisitions-improve-the-repeatability-of-liver-fat-quantification-using-confounder-corrected-chemical-shift-encoded-mr-imaging
#13
Utaroh Motosugi, Diego Hernando, Curtis Wiens, Peter Bannas, Scott B Reeder
PURPOSE: To determine whether high signal-to-noise ratio (SNR) acquisitions improve the repeatability of liver proton density fat fraction (PDFF) measurements using confounder-corrected chemical shift-encoded magnetic resonance (MR) imaging (CSE-MRI). MATERIALS AND METHODS: Eleven fat-water phantoms were scanned with 8 different protocols with varying SNR. After repositioning the phantoms, the same scans were repeated to evaluate the test-retest repeatability. Next, an in vivo study was performed with 20 volunteers and 28 patients scheduled for liver magnetic resonance imaging (MRI)...
October 10, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28163295/shrunken-hepatic-hemangioma-following-delineated-peritumoral-hyperintensity-on-gadoxetic-acid-disodium-enhanced-mr-imaging
#14
Hiroki Haradome, Takao Okubo, Yusuke Toda, Jun Woo, Tadatoshi Takayama, Osamu Abe
No abstract text is available yet for this article.
October 10, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28835572/time-spatial-labeling-inversion-pulse-time-slip-with-pencil-beam-pulse-a-selective-labeling-technique-for-observing-cerebrospinal-fluid-flow-dynamics
#15
Shuhei Shibukawa, Tosiaki Miyati, Tetsu Niwa, Mitsunori Matsumae, Tetsuo Ogino, Tomohiko Horie, Yutaka Imai, Isao Muro
We assessed labeling region selectivity on time-spatial labeling inversion pulse (Time-SLIP) with pencil beam pulse (PB Time-SLIP) for the use of visualizing cerebrospinal fluid (CSF) flow dynamics. We compared the selectivity of labeling to the third and fourth ventricles between PB Time-SLIP and conventional Time-SLIP (cTime-SLIP) in eight volunteers and one patient using a 1.5T magnetic resonance imaging (MRI). PB Time-SLIP provided more selective labeling in CSF than cTime-SLIP, particularly in complex anatomical regions...
August 24, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28824051/factors-that-differentiate-between-endometriosis-associated-ovarian-cancer-and-benign-ovarian-endometriosis-with-mural-nodules
#16
Yasuhito Tanase, Ryuji Kawaguchi, Junko Takahama, Hiroshi Kobayashi
PURPOSE: Mural nodules and papillary projections can be seen in benign ovarian endometriosis (OE) and malignant transformation of OE (endometriosis-associated ovarian cancer [EAOC]), which can pose a challenging diagnostic dilemma to clinicians. We identify the preoperative imaging characteristics helpful to the differential diagnosis between benign OE with mural nodules and EAOC. MATERIALS AND METHODS: This was a retrospective study of 82 patients who were diagnosed pathologically to have OE with mural nodules (n = 42) and malignant transformations of these tumors (n = 40) at the Nara Medical University Hospital from January 2008 to January 2015...
August 21, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28819086/measurement-of-cerebrospinal-fluid-flow-dynamics-using-phase-contrast-mr-imaging-with-bilateral-jugular-vein-compression-a-feasibility-study-in-healthy-volunteers
#17
Shintaro Ichikawa, Utaroh Motosugi, Akihiro Okumura, Tatsuya Shimizu, Hiroshi Onishi
We measured the changes in the cerebrospinal fluid (CSF) flow dynamics after compression of the bilateral jugular veins using phase contrast-magnetic resonance imaging (PC-MRI). PC-MRI was performed in 10 healthy male volunteers using a 3T clinical scanner with a two-dimensional gradient echo sequence. We successfully measured the changes in CSF flow velocity using PC-MRI with and without compression of the bilateral jugular veins. The relative velocity range decreased by about 30% when the bilateral jugular veins were compressed...
August 16, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28819085/histological-grading-of-hepatocellular-carcinomas-with-intravoxel-incoherent-motion-diffusion-weighted-imaging-inconsistent-results-depending-on-the-fitting-method
#18
Shintaro Ichikawa, Utaroh Motosugi, Diego Hernando, Hiroyuki Morisaka, Nobuyuki Enomoto, Masanori Matsuda, Hiroshi Onishi
PURPOSE: To compare the abilities of three intravoxel incoherent motion (IVIM) imaging approximation methods to discriminate the histological grade of hepatocellular carcinomas (HCCs). METHODS: Fifty-eight patients (60 HCCs) underwent IVIM imaging with 11 b-values (0-1000 s/mm(2)). Slow (D) and fast diffusion coefficients (D(*)) and the perfusion fraction (f) were calculated for the HCCs using the mean signal intensities in regions of interest drawn by two radiologists...
August 16, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28819084/the-significance-of-lactate-and-lipid-peaks-for-predicting-primary-neuroepithelial-tumor-grade-with-proton-mr-spectroscopy
#19
Hisao Nakamura, Masatomo Doi, Takuya Suzuki, Yasuyuki Yoshida, Masahiro Hoshikawa, Masashi Uchida, Yuichiro Tanaka, Masayuki Takagi, Yasuo Nakajima
PURPOSE: (1)H-MRS is a non-invasive technique used to assess the metabolic activity of brain tumors. The technique is useful for the preoperative prediction of tumor grade, which is important for treatment planning and accurate prognosis. We used (1)H-MRS to study the lactate peak, which appears in various conditions, including hyperglycemia, ischemia, and hypoxia and lipid peak, which is associated with necrotic cells. The purpose of this study was to retrospectively examine the frequency and significance of lactate and lipid peaks in relation to brain tumor grade...
August 16, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28202854/three-dimensional-cardiac-mr-imaging-related-techniques-and-clinical-applications
#20
Yasuo Amano, Fumi Yanagisawa, Masaki Tachi, Kuniya Asai, Yasuyuki Suzuki, Hidenobu Hashimoto, Kiyohisa Ishihara, Shinichiro Kumita
Three-dimensional (3D) cardiac magnetic resonance (MR) imaging has several advantages, including the easy coverage of the entire heart without misregistration, reduction of breath-holding times, and availability for postprocessing reconstruction. These advantages are associated with some techniques such as breath-hold or navigator gating and parallel imaging. However, the image quality of 3D cardiac MR images is compromised by the use of a shorter repetition time and parallel imaging. Thus, a steady-state free precession sequence, contrast agent administration, and presaturation pulses are used to maintain the image quality...
July 10, 2017: Magnetic Resonance in Medical Sciences: MRMS
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