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Magnetic Resonance in Medical Sciences: MRMS

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https://www.readbyqxmd.com/read/29984783/the-effect-of-varying-slice-thickness-and-interslice-gap-on-t-1-and-t-2-measured-with-the-multidynamic-multiecho-sequence
#1
Koung Mi Kang, Seung Hong Choi, Hyeonjin Kim, Moonjung Hwang, Roh-Eul Yo, Tae Jin Yun, Ji-Hoon Kim, Chul-Ho Sohn
PURPOSE: The purpose of our study was to investigate the effect of different slice thicknesses and/or interslice gaps on longitudinal and transverse relaxation times (T1 and T2 ) measured by a multi-dynamic, multi-echo (MDME) sequence. MATERIALS AND METHODS: This retrospective study included nine healthy subjects who underwent MDME sequence (at 3T) with four different combinations of slice thicknesses and/or interslice gaps: slice thickness of 4 mm and interslice gap of 0 mm (TH4/G0), TH4/G1, TH5/G0, and TH5/G1...
July 6, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/29899170/development-of-a-surface-marker-for-fractional-anisotropy-maps-using-wood-in-a-phantom-study
#2
Masashi Suzuki, Atsushi Senoo, Mamoru Niitsu
PURPOSE: To improve imaging, a reliable setup method is critical for the accurate localization of lesions and surface markers. Because an anisotropic marker has not yet been validated for MRI, direct localization of surface markers is not yet feasible in fractional anisotropy (FA) maps. This study aimed to develop an anisotropic surface marker using wood for an FA map and to determine whether a wood marker is useful for various sequences. METHODS: Wood infiltrated with water was used to develop an anisotropic surface marker...
June 13, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/29848919/differentiating-between-glioblastoma-and-primary-cns-lymphoma-using-combined-whole-tumor-histogram-analysis-of-the-normalized-cerebral-blood-volume-and-the-apparent-diffusion-coefficient
#3
Shixing Bao, Yoshiyuki Watanabe, Hiroto Takahashi, Hisashi Tanaka, Atsuko Arisawa, Chisato Matsuo, Rongli Wu, Yasunori Fujimoto, Noriyuki Tomiyama
PURPOSE: This study aimed to determine whether whole-tumor histogram analysis of normalized cerebral blood volume (nCBV) and apparent diffusion coefficient (ADC) for contrast-enhancing lesions can be used to differentiate between glioblastoma (GBM) and primary central nervous system lymphoma (PCNSL). METHODS: From 20 patients, 9 with PCNSL and 11 with GBM without any hemorrhagic lesions, underwent MRI, including diffusion-weighted imaging and dynamic susceptibility contrast perfusion-weighted imaging before surgery...
May 31, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/29848918/a-grading-scale-for-pial-collaterals-in-middle-cerebral-artery-total-occlusion-based-on-time-of-flight-mr-angiography-source-images
#4
Huai Wu Yuan, Ren Jie Ji, An Li Wang, Ya Jie Lin, Han Feng Chen, Zi Qi Xu, Guo Ping Peng, Ben Yan Luo
PURPOSE: To verify whether a new grading based on time-of-flight magnetic resonance angiography source images (TOF-MRAsi) can reflect the abundance of pial collaterals, in patients with total occlusion of M1 segment of middle cerebral artery in the chronic stage. METHODS: In this single-center retrospective study, consecutive patients with total occlusion of M1 segment of middle cerebral artery, with both magnetic resonances angiography and digital subtraction angiography image were included...
May 31, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/29794408/diffusion-weighting-caused-by-spoiler-gradients-in-the-fast-imaging-with-steady-state-precession-sequence-may-lead-to-inaccurate-t-2-measurements-in-mr-fingerprinting
#5
Yuta Kobayashi, Yasuhiko Terada
Magnetic resonance fingerprinting (MRF) is a promising framework that allows the quantification of multiple magnetic resonance parameters with a single scan. MRF using fast imaging with steady-state precession (MRF-FISP) has robustness to off-resonance artifacts and has many applications in inhomogeneous fields. However, the spoiler gradient used in MRF-FISP is sensitive to diffusion motion, and may lead to quantification errors when the spoiler moment increases. In this study, we examined the effect of the diffusion weighting in MRF-FISP caused by spoiler gradients...
May 24, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/29794407/a-case-of-uterine-tumor-resembling-ovarian-sex-cord-tumor-utrosct-exhibiting-similar-imaging-characteristics-to-those-of-ovarian-sex-cord-tumor
#6
Mayumi Takeuchi, Kenji Matsuzaki, Yoshimi Bando, Masato Nishimura, Aki Hayashi, Masafumi Harada
No abstract text is available yet for this article.
May 24, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/29794406/inter-individual-comparison-of-gadobutrol-and-gadoteridol-tissue-time-intensity-profiles-for-dynamic-susceptibility-contrast-perfusion-mr-imaging
#7
Masahiro Yamada, Toshiaki Taoka, Ai Kawaguchi, Kenji Yasuda, Yasushi Niinomi, Yoichi Ohashi, Takahito Okuda, Shinji Naganawa
PURPOSE: Gadobutrol is a gadolinium-based contrast material (GBCM) with a high concentration of gadolinium and high relaxivity. Our purpose was to evaluate the signal intensity profiles in brain tissue for the bolus width and degree of signal change after bolus injection using an echo planar dynamic susceptibility contrast (DSC) sequence. We compared gadobutrol to gadoteridol using various injection speeds and saline flush volumes. METHODS: We studied 97 patients who underwent brain MRI...
May 24, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/29769457/3d-cones-acquisition-of-human-extremity-imaging-using-a-1-5t-superconducting-magnet-and-an-unshielded-gradient-coil-set
#8
Ayana Setoi, Katsumi Kose
We developed ultrashort echo-time (UTE) imaging sequences with 3D Cones trajectories for a home-built compact MRI system using a 1.5T superconducting magnet and an unshielded gradient coil set. We achieved less than 7 min imaging time and obtained clear in vivo images of a human forearm with a TE of 0.4 ms. We concluded that UTE imaging using 3D Cones acquisition was successfully implemented in our 1.5T MRI system.
May 16, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/29769456/machine-learning-based-texture-analysis-of-contrast-enhanced-mr-imaging-to-differentiate-between-glioblastoma-and-primary-central-nervous-system-lymphoma
#9
Akira Kunimatsu, Natsuko Kunimatsu, Koichiro Yasaka, Hiroyuki Akai, Kouhei Kamiya, Takeyuki Watadani, Harushi Mori, Osamu Abe
PURPOSE: Although advanced MRI techniques are increasingly available, imaging differentiation between glioblastoma and primary central nervous system lymphoma (PCNSL) is sometimes confusing. We aimed to evaluate the performance of image classification by support vector machine, a method of traditional machine learning, using texture features computed from contrast-enhanced T1 -weighted images. METHODS: This retrospective study on preoperative brain tumor MRI included 76 consecutives, initially treated patients with glioblastoma (n = 55) or PCNSL (n = 21) from one institution, consisting of independent training group (n = 60: 44 glioblastomas and 16 PCNSLs) and test group (n = 16: 11 glioblastomas and 5 PCNSLs) sequentially separated by time periods...
May 16, 2018: 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...
April 10, 2018: 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
#11
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...
April 10, 2018: 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
#12
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...
April 10, 2018: 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
#13
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/mm2 ). 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...
April 10, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28652524/single-breath-hold-whole-heart-unenhanced-coronary-mra-using-multi-shot-gradient-echo-epi-at-3t-comparison-with-free-breathing-turbo-field-echo-coronary-mra-on-healthy-volunteers
#14
Yuji Iyama, Takeshi Nakaura, Yasunori Nagayama, Seitaro Oda, Daisuke Utsunomiya, Masafumi Kidoh, Hideaki Yuki, Kenichiro Hirata, Tomohiro Namimoto, Mika Kitajima, Kosuke Morita, Yoshinori Funama, Atsushi Takemura, Tomoyuki Okuaki, Yasuyuki Yamashita
PURPOSE: We investigated the feasibility of single breath hold unenhanced coronary MRA using multi-shot gradient echo planar imaging (MSG-EPI) on a 3T-scanner. METHODS: Fourteen volunteers underwent single breath hold coronary MRA with a MSG-EPI and free-breathing turbo field echo (TFE) coronary MRA at 3T. The acquisition time, signal to noise ratio (SNR), and the contrast of the sequences were compared with the paired t-test. Readers evaluated the image contrast, noise, sharpness, artifacts, and the overall image quality...
April 10, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28626199/oxygen-and-glucose-as-stimulation-agents-for-bold-functional-mr-imaging-of-rabbit-liver-a-feasibility-study
#15
Fang Yuan, Bin Song, Zixing Huang, Xijiao Liu, Chunchao Xia
PURPOSE: To assess the feasibility of using oxygen and glucose as stimulating agents in blood-oxygen-level-dependent (BOLD) Functional Magnetic Resonance Imaging (fMRI) of rabbit liver and analyze the impacts by blood flow. METHODS: Pure oxygen inhalation, intravenous injection and oral administration of glucose were given to 11 New Zealand white rabbits to compare the differences of liver T2 *, aortic flow (AF), portal vein flow (PVF), aortic area (AA) and portal vein area (PVA) before and at 5 min, 10 min, 20 min, 30 min after administrations...
April 10, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28592708/low-signal-intensity-rims-along-the-cerebral-cortex-and-u-fibers-on-susceptibility-weighted-imaging-in-progressive-multifocal-leukoencephalopathy
#16
Yuki Arita, Hirokazu Fujiwara, Jun Kurasawa, Suketaka Momoshima, Tsubasa Takizawa, Masahiro Jinzaki
No abstract text is available yet for this article.
April 10, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28539559/simultaneous-visualization-of-vessels-and-brain-tumor-with-contrast-enhanced-three-dimensional-phase-contrast-mr-imaging
#17
Yutaka Shigenaga, Masato Sasaki, Takeshi Ishimoto, Keiko Ama
The sequence for concurrently depicting engulfed vessels and a well-enhanced tumor in once-off scanning has never been reported for preoperative magnetic resonance imaging for brain tumor resection. Multimodal fusion techniques have been recently developed, but the risks of misregistration still remain. Here a case is reported where contrast-enhanced three-dimensional phase contrast sequence concurrently depicted an engulfed vessel and metastatic brain tumor in once-off scanning and related technical aspects are discussed...
April 10, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28529248/a-case-of-intracranial-subependymoma-histopathological-confirmation-of-ring-shaped-lateral-ventricular-nodule
#18
Keita Kuya, Yuki Shinohara, Hiroki Yoshioka, Satoshi Kuwamoto, Masamichi Kurosaki, Toshihide Ogawa
No abstract text is available yet for this article.
April 10, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28515408/variable-distribution-of-pseudolobules-in-ovarian-sclerosing-stromal-tumors-utility-of-diffusion-weighted-imaging-for-differential-diagnosis
#19
Koichi Ito, Yumiko Oishi Tanaka, Ryosuke Watanabe, Hiroko Tanaka, Yutaka Takazawa, Kiyoshi Matsueda
No abstract text is available yet for this article.
April 10, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28367906/spiral-mri-on-a-9-4t-vertical-bore-superconducting-magnet-using-unshielded-and-self-shielded-gradient-coils
#20
Nao Kodama, Ayana Setoi, Katsumi Kose
Spiral MRI sequences were developed for a 9.4T vertical standard bore (54 mm) superconducting magnet using unshielded and self-shielded gradient coils. Clear spiral images with 64-shot scan were obtained with the self-shielded gradient coil, but severe shading artifacts were observed for the spiral-scan images acquired with the unshielded gradient coil. This shading artifact was successfully corrected with a phase-correction technique using reference scans that we developed based on eddy current field measurements...
April 10, 2018: Magnetic Resonance in Medical Sciences: MRMS
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