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Magnetic Resonance in Medical Sciences: MRMS

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https://www.readbyqxmd.com/read/28302937/update-your-knowledge-of-abdominal-mri-recent-results-which-may-change-your-practice
#1
Utaroh Motosugi
No abstract text is available yet for this article.
March 9, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28250355/passive-shimming-of-mri-static-magnetic-field-using-regularization-of-truncated-singular-value-decomposition
#2
Mitsushi Abe
PURPOSE: To develop a new shimming calculation method, which can calculate iron piece placements rapidly to make the magnetic field homogeneous at intended homogeneity and then to make the shimming working time short. MATERIALS AND METHODS: The shimming calculation yields magnetic moment (MM) distribution, which is calculated by the truncated singular value decomposition (SVD) from the measured magnetic field. The MM distribution is described by a superposition of eigenmodes obtained by SVD of a response matrix from the moment distributions to magnetic fields at the field of view (FOV)...
March 2, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28202854/three-dimensional-cardiac-mr-imaging-related-techniques-and-clinical-applications
#3
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
#4
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
#5
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
#6
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
#7
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
#8
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
#9
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
#10
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
#11
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
#12
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
#13
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/27725576/t1-shortening-in-the-cerebral-cortex-after-multiple-administrations-of-gadolinium-based-contrast-agents
#14
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...
January 10, 2017: 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
#15
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...
January 10, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/27646153/feasibility-of-computed-diffusion-weighted-imaging-and-optimization-of-b-value-in-cervical-cancer
#16
Yusaku Moribata, Aki Kido, Koji Fujimoto, Yuki Himoto, Yasuhisa Kurata, Fuki Shitano, Kayo Kiguchi, Ikuo Konishi, Kaori Togashi
PURPOSE: To evaluate the feasibility of computed diffusion weighted imaging (DWI) in cervical cancer and investigate the optimal b-value using computed DWI. METHODS: The present retrospective study involved 85 patients with cervical cancer in the International Federation of Gynecology and Obstetrics (FIGO) stage IB, IIA or IIB. DWI was obtained with b-values of 0, 100, 500 and 1000 s/mm(2). Computed DWI with b-values of 800, 1000, 1300, 1600 and 2000 s/mm(2) (cDWI800, cDWI1000, cDWI1300, cDWI1600, cDWI2000) were generated from all measured DWI (mDWI) data...
January 10, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/27535592/high-resolution-3t-mr-imaging-of-the-triangular-fibrocartilage-complex
#17
Donald von Borstel, Michael Wang, Kirstin Small, Taiki Nozaki, Hiroshi Yoshioka
This study is intended as a review of 3Tesla (T) magnetic resonance (MR) imaging of the triangular fibrocartilage complex (TFCC). The recent advances in MR imaging, which includes high field strength magnets, multi-channel coils, and isotropic 3-dimensional (3D) sequences have enabled the visualization of precise TFCC anatomy with high spatial and contrast resolution. In addition to the routine wrist protocol, there are specific techniques used to optimize 3T imaging of the wrist; including driven equilibrium sequence (DRIVE), parallel imaging, and 3D imaging...
January 10, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/27430361/gd-based-contrast-enhancement-of-the-perivascular-spaces-in-the-basal-ganglia
#18
Shinji Naganawa, Toshiki Nakane, Hisashi Kawai, Toshiaki Taoka
PURPOSE: In textbooks, the perivascular space (PVS) is described as non-enhancing after the intravenous administration of gadolinium-based contrast agent (IV-GBCA). We noticed that the PVS sometimes has high signal intensity (SI) on heavily T2-weighted 3D-FLAIR (hT2-FL) images obtained 4 h after IV-GBCA. The purpose of this study was to retrospectively evaluate the contrast enhancement of the PVS. MATERIALS AND METHODS: In 8 healthy subjects and 19 patients with suspected endolymphatic hydrops, magnetic resonance cisternography (MRC) and hT2-FL images were obtained before and 4 h after a single dose of IV-GBCA...
January 10, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/27170422/arterial-transit-time-corrected-renal-blood-flow-measurement-with-pulsed-continuous-arterial-spin-labeling-mr-imaging
#19
Kazuhiro Shimizu, Nobuyuki Kosaka, Yasuhiro Fujiwara, Tsuyoshi Matsuda, Tatsuya Yamamoto, Tatsuro Tsuchida, Katsuki Tsuchiyama, Nobuyuki Oyama, Hirohiko Kimura
PURPOSE: The importance of arterial transit time (ATT) correction for arterial spin labeling MRI has been well debated in neuroimaging, but it has not been well evaluated in renal imaging. The purpose of this study was to evaluate the feasibility of pulsed continuous arterial spin labeling (pcASL) MRI with multiple post-labeling delay (PLD) acquisition for measuring ATT-corrected renal blood flow (ATC-RBF). MATERIALS AND METHODS: A total of 14 volunteers were categorized into younger (n = 8; mean age, 27...
January 10, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/27151746/analysis-of-fluctuation-in-cerebral-venous-oxygenation-using-mr-imaging-quantitative-evaluation-of-vasomotor-function-of-arterioles
#20
Minghui Tang, Keigo Nishi, Toru Yamamoto
PURPOSE: Cerebral arteriolar vasomotor function plays an important role in brain health. Since respiratory changes in the partial arterial pressure of CO2 (PaCO2) cause arterioles to vasodilate or vasoconstrict, resting-state arteriolar vasomotion results in the fluctuation of venous blood oxygenation, which can be monitored by observing magnetic resonance (MR) signals. Focusing on the superior sagittal sinus as the largest cerebral vein, we developed a method to elucidate the respiratory fluctuation of cerebral venous oxygenation that may reflect the vasomotor function...
January 10, 2017: Magnetic Resonance in Medical Sciences: MRMS
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