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Magnetic Resonance in Medical Sciences: MRMS

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https://www.readbyqxmd.com/read/28202854/three-dimensional-cardiac-mr-imaging-related-techniques-and-clinical-applications
#1
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...
February 16, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28202853/structures-showing-negative-correlations-of-signal-intensity-with-postnatal-age-on-t1-weighted-imaging-of-the-brain-of-newborns-and-infants
#2
Saeka Hori, Toshiaki Taoka, Tomoko Ochi, Toshiteru Miyasaka, Masahiko Sakamoto, Katsutoshi Takayama, Takeshi Wada, Kaoru Myochin, Yukihiro Takahashi, Kimihiko Kichikawa
PURPOSE: Although the neonatal and infantile brain typically shows sequential T1 shortening according to gestational age as a result of myelination, several structures do not follow this rule. We evaluated the relationship between the signal intensity of various structures in the neonatal and infantile brain on T1-weighted imaging (T1WI) and either postnatal or gestational age. MATERIALS AND METHODS: We examined magnetic resonance images from 120 newborns and infants without any abnormalities in the central nervous system...
February 16, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28190854/evaluation-of-diffusion-weighted-mr-imaging-as-a-technique-for-detecting-bone-marrow-edema-in-patients-with-osteitis-pubis
#3
Iclal Erdem Toslak, Bulent Cekic, Aysen Turk, Ali Eraslan, A Eda Parlak
PURPOSE: Our aims were to determine the feasibility of diffusion-weighted magnetic resonance imaging (DWI) in the detection of bone marrow edema (BME) and explore the apparent diffusion coefficient (ADC) alterations in patients with osteitis pubis (OP). MATERIALS AND METHODS: Fourty two consecutive patients clinically suspected to have athletic pubalgia and 31 control subjects were enrolled in the study. All subjects underwent diagnostic focused magnetic resonance imaging (MRI) and DWI at b values of 0 and 600 s/mm(2)...
February 13, 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
#4
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)...
February 13, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28190852/characteristics-of-hepatic-schwannoma-presenting-as-an-unusual-multi-cystic-mass-on-gadoxetic-acid-disodium-enhanced-mr-imaging
#5
Hiroki Haradome, Jun Woo, Hisashi Nakayama, Haruna N Watanabe, Masahiro Ogawa, Mitsuhiko Moriyama, Masahiko Sugitani, Tadatoshi Takayama, Osamu Abe
Hepatic schwannoma is a very rare hepatic tumor, usually appearing as a hypervascular solid mass with or without various degrees of cystic changes; however, to the best of our knowledge, only the two cases of hepatic schwannoma showing a multi-cystic appearance have previously been reported. We report herein a benign hepatic schwannoma presenting as an unusually large multi-cystic mass. The gadoxetic acid disodium-enhanced magnetic resonance imaging features are described with the histopathologic correlation and briefly review the literature...
February 13, 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
#6
Hiroki Haradome, Takao Okubo, Yusuke Toda, Jun Woo, Tadatoshi Takayama, Osamu Abe
No abstract text is available yet for this article.
February 6, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28132997/polymer-brush-afforded-spio-nanoparticles-show-a-unique-biodistribution-and-mr-imaging-contrast-in-mouse-organs
#7
Ting Chen, Yuki Mori, Chizuko Inui-Yamamoto, Yutaka Komai, Yoshiyuki Tago, Shinichi Yoshida, Yoshitsugu Takabatake, Yoshitaka Isaka, Kohji Ohno, Yoshichika Yoshioka
INTRODUCTION: To investigate the biodistribution and retention properties of the new super paramagnetic iron oxide (new SPIO: mean hydrodynamic diameter, 100 nm) nanoparticles, which have concentrated polymer brushes in the outer shell and are difficult for phagocytes to absorb, and to compare the new SPIO with clinically approved SPIO (Resovist: mean hydrodynamic diameter, 57 nm). MATERIALS AND METHODS: 16 male C57BL/6N mice were divided in two groups according to the administered SPIO (n = 8 for each group; intravenous injection does, 0...
January 30, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28132996/influence-of-spatial-resolution-in-three-dimensional-cine-phase-contrast-magnetic-resonance-imaging-on-the-accuracy-of-hemodynamic-analysis
#8
Atsushi Fukuyama, Haruo Isoda, Kento Morita, Marika Mori, Tomoya Watanabe, Kenta Ishiguro, Yoshiaki Komori, Takafumi Kosugi
INTRODUCTION: We aim to elucidate the effect of spatial resolution of three-dimensional cine phase contrast magnetic resonance (3D cine PC MR) imaging on the accuracy of the blood flow analysis, and examine the optimal setting for spatial resolution using flow phantoms. MATERIALS AND METHODS: The flow phantom has five types of acrylic pipes that represent human blood vessels (inner diameters: 15, 12, 9, 6, and 3 mm). The pipes were fixed with 1% agarose containing 0...
January 30, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28123166/lack-of-contrast-enhancement-in-a-giant-perivascular-space-of-the-basal-ganglion-on-delayed-flair-images-implications-for-the-glymphatic-system
#9
Shinji Naganawa, Toshiki Nakane, Hisashi Kawai, Toshiaki Taoka
No abstract text is available yet for this article.
January 25, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28090008/characterization-of-the-growth-of-deep-and-subcortical-white-matter-hyperintensity-on-mr-imaging-a-retrospective-cohort-study
#10
Michito Adachi, Takamichi Sato
PURPOSE: In elderly patients, deep and subcortical white matter hyperintense lesions are frequently observed on MRI; however, the growth process of these lesions is unclear. The aims of this retrospective cohort study were to elucidate the growth characteristics of deep and subcortical white matter hyperintense lesions, and to insight their etiology. MATERIALS AND METHODS: We enrolled 103 patients (1610 lesions) whose deep and subcortical white matter hyperintense lesions were monitored for 3 or more years by MRI examination...
January 13, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28090007/ductal-carcinoma-in-situ-detected-during-prospective-mr-imaging-screening-of-a-woman-with-a-brca2-mutation-the-first-case-report-in-japan
#11
Mitsuhiro Tozaki, Seigo Nakamura, Dai Kitagawa, Takuji Iwase, Rie Horii, Futoshi Akiyama, Masami Arai
The present case is the first report in Japan in which a breast cancer was discovered as a result of prospective magnetic resonance imaging (MRI) screening study for BRCA1/2 mutation carriers who were free of breast or ovarian cancer. This case is significant and it verifies the importance of MRI screening in breast or ovarian cancer-free BRCA1/2 mutation carriers who do not exhibit positive mammographic or ultrasonographic findings.
January 13, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28025469/mr-spectroscopy-in-patients-with-hereditary-diffuse-leukoencephalopathy-with-spheroids-and-asymptomatic-carriers-of-colony-stimulating-factor-1-receptor-mutation
#12
Takashi Abe, Toshitaka Kawarai, Koji Fujita, Wataru Sako, Yuka Terasawa, Tsuyoshi Matsuda, Waka Sakai, Ai Tsukamoto-Miyashiro, Naoko Matsui, Yuishin Izumi, Ryuji Kaji, Masafumi Harada
PURPOSE: Hereditary diffuse leukoencephalopathy with spheroids (HDLS) is a rare neurodegenerative disorder with various clinical presentations. Mutation of the colony-stimulating factor 1 receptor (CSF1R) gene is considered to be a cause of this autosomal dominant disorder. The purpose of this study was to report magnetic resonance spectroscopy (MRS) findings in patients with HDLS and asymptomatic carriers and to clarify the use of MRS in this disease. MATERIALS AND METHODS: In this retrospective, institutional review board-approved study, we included four consecutive patients, genetically diagnosed with HDLS, and two asymptomatic carriers after acquiring informed consent...
December 26, 2016: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28025468/evaluation-of-fetal-thyroid-with-3d-gradient-echo-t1-weighted-mr-imaging
#13
Shinya Fujii, Junichi Nagaishi, Naoko Mukuda, Sachi Kaneda, Chie Inoue, Takeru Fukunaga, Toshihide Ogawa
PURPOSE: The characteristics of fetal thyroid on magnetic resonance (MR) imaging, including normal thyroid and disorders other than goiter have not been fully evaluated. Our aim was to assess fetal thyroid using three dimensional (3D) gradient echo (GRE) T1-weighted MR imaging and to examine the usefulness of this modality. MATERIALS AND METHODS: The study included 27 3D GRE T1-weighted images from 26 fetuses. The largest possible region of interest (ROI) within the thyroid at the slice level depicting the thyroid was manually defined and three circular ROIs on neck muscle were manually defined on the image slices showing the highest signal intensity (SI) of the thyroid...
December 26, 2016: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28003624/viability-of-oxygen-enhanced-ventilation-imaging-of-the-lungs-using-ultra-short-echo-time-mri
#14
Tomoaki Sasaki, Koji Takahashi, Makoto Obara
PURPOSE: To assess the viability of oxygen-enhanced ventilation images using ultra-short echo time magnetic resonance imaging (UTE-MRI). METHODS: We evaluated the oxygen enhancement of the pulmonary T2*, and pulmonary signals in each TE (0.2, 0.8, 1.4, 2.0 ms) in 21 nonsmokers. RESULTS: The oxygen enhancement of pulmonary signals was the most significant (32%) at the 0.2 ms TE, the second in the pulmonary T2* (-18%). CONCLUSIONS: Pulmonary images using UTE-MRI are useful for ventilation imaging...
December 22, 2016: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28003623/internal-structures-of-the-globus-pallidus-in-patients-with-parkinson-s-disease-evaluation-with-phase-difference-enhanced-imaging
#15
Satoru Ide, Shingo Kakeda, Tetsuya Yoneda, Junji Moriya, Keita Watanabe, Atsushi Ogasawara, Koichiro Futatsuya, Norihiro Ohnari, Toru Sato, Yasuhiro Hiai, Atsuji Matsuyama, Hitoshi Fujiwara, Masanori Hisaoka, Yukunori Korogi
PURPOSE: The medial medullary lamina (MML) separates the medial globus pallidus (GPm) from the lateral. The aim of this study was to assess the changes in appearance of MML related to age using the phase difference-enhanced imaging (PADRE) and to determine whether PADRE can depict the MML in the patients with Parkinson's disease (PD). MATERIALS AND METHODS: We enrolled 20 patients with PD and 50 normal control subjects (NC). First, for the visualization of the MML in the NC, we compared the PADRE, susceptibility-weighted imaging (SWI)-like images and T2 weighted imaging (WI) by using multiple comparison...
December 22, 2016: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28003622/cranial-pachymeningeal-involvement-in-poems-syndrome-evaluation-by-pre-and-post-contrast-flair-and-t1-weighted-imaging
#16
Fumiaki Ueda, Miho Okuda, Hiroyuki Aburano, Yuichi Yoshie, Osamu Matsui, Toshifumi Gabata
PURPOSE: To evaluate the cranial pachymeningeal involvement of polyneuropathy, organomegaly, endocrinopathy, monoclonal gammopathy, skin changes (POEMS) syndrome using pre- and post-contrast fluid-attenuated inversion recovery (FLAIR) and T1-weighted imaging (T1WI). METHODS: The appearance of pachymeningeal involvement in nine cases of POEMS syndrome was evaluated using pre- and post-contrast FLAIR and T1WI. The degree of pachymeningeal thickening was graded as normal or abnormal using pre-contrast FLAIR...
December 22, 2016: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28003621/the-mechanism-causing-high-signal-intensity-on-diffusion-weighted-imaging-in-adnexal-torsion-two-case-reports
#17
Shinya Fujii, Naoko Mukuda, Kanae Nosaka, Takeru Fukunaga, Chie Inoue, Toshihide Ogawa
We report two cases with adnexal torsion to assess the mechanism of very strong signal intensity in ovarian lesions on DW imaging using MR imaging such as T2*-weighted imaging. MR imaging findings of the cases suggest that the very strong signal intensity on DW imaging is contributed to cytotoxic edema with or without vasogenic edema, as well as oxyhemoglobin or extracellular methemoglobin.
December 22, 2016: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28003620/synthetic-mr-imaging-in-the-diagnosis-of-bacterial-meningitis
#18
Christina Andica, Akifumi Hagiwara, Misaki Nakazawa, Kanako K Kumamaru, Masaaki Hori, Mitsuru Ikeno, Toshiaki Shimizu, Shigeki Aoki
No abstract text is available yet for this article.
December 22, 2016: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28003619/mass-forming-retroperitoneal-endometriosis-including-a-fat-component-a-diagnostic-dilemma
#19
Yusuke Kyuragi, Akihiro Nishie, Yukihisa Takayama, Yoshiki Asayama, Kousei Ishigami, Takashi Ueki, Minako Hirahashi, Hiroshi Honda
No abstract text is available yet for this article.
December 22, 2016: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/27941296/investigation-of-the-longitudinal-relaxation-time-of-rat-tibial-cortical-bone-using-swift
#20
Tsuyoshi Sukenari, Kazuya Ikoma, Motoyuki Horii, Masahiro Umeda, Masamitsu Kido, Shigeki Hayashi, Yusuke Hara, Tetsuro Yamasaki, Okihiro Onishi, Toru Morihara, Hiroyoshi Fujiwara, Mitsuhiro Kawata, Toshikazu Kubo
Sweep imaging with Fourier transform (SWIFT) method has been developed to image tissues with very short T2 values, such as cortical bone. The purpose of this study was to measure the T1 value of the rat cortical bone. It was approximately 120 ms on 7.04T. This result could thus be useful for studying bony tissue according to the SWIFT method in the future.
December 12, 2016: Magnetic Resonance in Medical Sciences: MRMS
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