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Magnetic Resonance in Medical Sciences: MRMS

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https://www.readbyqxmd.com/read/28090008/characterization-of-the-growth-of-deep-and-subcortical-white-matter-hyperintensity-on-mr-imaging-a-retrospective-cohort-study
#1
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
#2
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
#3
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
#4
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
#5
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
#6
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
#7
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
#8
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
#9
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
#10
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
#11
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
https://www.readbyqxmd.com/read/27941295/mr-spectroscopy-to-distinguish-between-supratentorial-intraventricular-subependymoma-and-central-neurocytoma
#12
Fumiaki Ueda, Hiroyuki Aburano, Yasuji Ryu, Yuichi Yoshie, Mitsutoshi Nakada, Yutaka Hayashi, Osamu Matsui, Toshifumi Gabata
PURPOSE: The purpose of this study was to discriminate supratentorial intraventricular subependymoma (SIS) from central neurocytoma (CNC) using magnetic resonance spectroscopy (MRS). METHODS: Single-voxel proton MRS using a 1.5T or 3T MR scanner from five SISs, five CNCs, and normal controls were evaluated. They were examined using a point-resolved spectroscopy. Automatically calculated ratios comparing choline (Cho), N-acetylaspartate (NAA), myoinositol (MI), and/or glycine (Gly) to creatine (Cr) were determined...
December 12, 2016: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/27853053/diagnostic-performance-of-diffusion-tensor-imaging-with-readout-segmented-echo-planar-imaging-for-invasive-breast-cancer-correlation-of-adc-and-fa-with-pathological-prognostic-markers
#13
Ken Yamaguchi, Takahiko Nakazono, Ryoko Egashira, Yoshiaki Komori, Jun Nakamura, Tomoyuki Noguchi, Hiroyuki Irie
PURPOSE: To assess the diagnostic performance of readout-segmented echo-planar diffusion tensor imaging (DTI based on rs-EPI) for breast cancer and to determine the correlation between the apparent diffusion coefficient (ADC) and fractional anisotropy (FA) values obtained from DTI based on rs-EPI with prognostic markers of invasive breast cancer. MATERIALS AND METHODS: This retrospective study examined 80 pathologically proven breast lesions (22 benign and 58 malignant lesions) of 80 patients who underwent both diffusion-weighted imaging based on single-shot echo-planar imaging (DWI based on ss-EPI) and DTI based on rs-EPI with b-values of 0 and 1000...
November 16, 2016: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/27818467/application-of-cardiac-gating-to-improve-the-reproducibility-of-intravoxel-incoherent-motion-measurements-in-the-head-and-neck
#14
Koung Mi Kang, Seung Hong Choi, Dong Eun Kim, Tae Jin Yun, Ji-Hoon Kim, Chul-Ho Sohn, Sun-Won Park
PURPOSE: To prospectively evaluate whether cardiac gating can improve the reproducibility of intravoxel incoherent motion (IVIM) parameters in the head and neck, we performed IVIM diffusion-weighted imaging (DWI) using 4 b values (4b), 4 b values with cardiac gating (4b gating) and 17 b values (17b). METHODS: We performed IVIM DWI twice per person on nine healthy volunteers using 4b, 4b gating and 17b and five patients with head and neck masses using 4b gating and 17b...
November 4, 2016: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/27795484/comparison-of-silent-and-conventional-mr-imaging-for-the-evaluation-of-myelination-in-children
#15
Chisato Matsuo-Hagiyama, Yoshiyuki Watanabe, Hisashi Tanaka, Hiroto Takahashi, Atsuko Arisawa, Eri Yoshioka, Shin Nabatame, Sayaka Nakano, Noriyuki Tomiyama
PURPOSE: Silent magnetic resonance imaging (MRI) scans produce reduced acoustic noise and are considered more gentle for sedated children. The aim of this study was to compare the validity of T1- (T1W) and T2-weighted (T2W) silent sequences for myelination assessment in children with conventional spin-echo sequences. MATERIALS AND METHODS: A total of 30 children (21 boys, 9 girls; age range: 1-83 months, mean age: 35.5 months, median age: 28.5 months) were examined using both silent and spin-echo sequences...
October 31, 2016: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/27725577/benefit-of-3t-diffusion-weighted-imaging-in-comparison-to-contrast-enhanced-mr-imaging-for-the-evaluation-of-disseminated-lesions-in-primary-malignant-brain-tumors
#16
Yoshihito Kadota, Toshinori Hirai, Hideo Nakamura, Keishi Makino, Shigetoshi Yano, Shinichiro Nishimura, Machiko Tateishi, Minako Azuma, Mika Kitajima, Yasuyuki Yamashita
PURPOSE: We aimed to determine whether 3T diffusion-weighted imaging (DWI) has an additive value relative to contrast-enhanced MR imaging for the detection of disseminated lesions in patients with primary malignant brain tumors. METHODS: We included consecutive 12 patients with nodular disseminated lesions of primary malignant brain tumors that were confirmed by surgery or follow-up MR imaging. All underwent conventional MR imaging, DWI at b = 1000 and 3000 s/mm(2), post-contrast T1-weighted and 3D gradient-echo imaging at 3T...
October 11, 2016: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/27725576/t1-shortening-in-the-cerebral-cortex-after-multiple-administrations-of-gadolinium-based-contrast-agents
#17
Zaw Aung Khant, Toshinori Hirai, Yoshihito Kadota, Rie Masuda, Takanori Yano, Minako Azuma, Yukiko Suzuki, Kuniyuki Tashiro
We report a 34-year-old male who manifested T1 shortening of the cerebral cortices after more than 86 contrast-enhanced MRI studies. We observed high-signal intensity (SI) on T1-weighted images (T1WIs) not only in the globus pallidus, dentate nucleus, and pulvinar of thalamus, but also in the cortices of the pre- and post-central gyri and around the calcarine sulcus. High SI in the cerebral cortices was not clearly demonstrated on T1WI scans performed 11 years earlier. The high SI we observed in these areas of the brain corresponded to areas with a normal iron-deposition predilection...
October 11, 2016: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/27725575/preliminary-comparison-of-multi-scale-and-multi-model-direct-inversion-algorithms-for-3t-mr-elastography
#18
Kengo Yoshimitsu, Yoshinobu Shinagawa, Toshimichi Mitsufuji, Emi Mutoh, Hiroshi Urakawa, Keiko Sakamoto, Ritsuko Fujimitsu, Koichi Takano
PURPOSE: To elucidate whether any differences are present in the stiffness map obtained with a multiscale direct inversion algorithm (MSDI) vs that with a multimodel direct inversion algorithm (MMDI), both qualitatively and quantitatively. MATERIALS AND METHODS: The MR elastography (MRE) data of 37 consecutive patients who underwent liver MR elastography between September and October 2014 were retrospectively analyzed by using both MSDI and MMDI. Two radiologists qualitatively assessed the stiffness maps for the image quality in consensus, and the measured liver stiffness and measurable areas were quantitatively compared between MSDI and MMDI...
October 11, 2016: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/27026354/quantitative-histological-validation-of-diffusion-tensor-mri-with-two-photon-microscopy-of-cleared-mouse-brain
#19
Koji Kamagata, Aurelien Kerever, Suguru Yokosawa, Yosuke Otake, Hisaaki Ochi, Masaaki Hori, Kouhei Kamiya, Kouhei Tsuruta, Kazuhiko Tagawa, Hitoshi Okazawa, Shigeki Aoki, Eri Arikawa-Hirasawa
No abstract text is available yet for this article.
October 11, 2016: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/27001398/echo-planar-imaging-for-a-9-4-tesla-vertical-bore-superconducting-magnet-using-an-unshielded-gradient-coil
#20
Nao Kodama, Katsumi Kose
Echo-planar imaging (EPI) sequences were developed for a 9.4 Tesla vertical standard bore (~54 mm) superconducting magnet using an unshielded gradient coil optimized for live mice imaging and a data correction technique with reference scans. Because EPI requires fast switching of intense magnetic field gradients, eddy currents were induced in the surrounding metallic materials, e.g., the room temperature bore, and this produced serious artifacts on the EPI images. We solved the problem using an unshielded gradient coil set of proper size (outer diameter = 39 mm, inner diameter = 32 mm) with time control of the current rise and reference scans...
October 11, 2016: Magnetic Resonance in Medical Sciences: MRMS
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