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Magnetic Resonance in Medical Sciences: MRMS

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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
#1
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
#2
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/29576582/the-reliability-of-reduced-field-of-view-dti-for-highly-accurate-quantitative-assessment-of-cervical-spinal-cord-tracts
#3
Takumi Yokohama, Motoyuki Iwasaki, Daisuke Oura, Sho Furuya, Tomoyuki Okuaki
PURPOSE: To compare the accuracy of fractional anisotropy (FA) and apparent diffusion coefficient (ADC) values between reduced FOV or so-called zonally oblique multislice (ZOOM) and conventional diffusion tensor imaging (DTI) in the cervical spinal cord. METHODS: Both ZOOM and conventional DTI were performed on 10 healthy volunteers. Intraclass correlation coefficient (ICC) was used to evaluate the reliability of the measurements obtained. Four radiologists evaluated the FA and ADC values at each cervical cord level and classified the visibility by 4 ranks...
March 23, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/29553066/the-new-restrictions-on-the-use-of-linear-gadolinium-based-contrast-agents-in-japan
#4
Tomonori Kanda
No abstract text is available yet for this article.
March 16, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/29540620/estimation-of-spatiotemporal-sensitivity-using-band-limited-signals-with-no-additional-acquisitions-for-k-t-parallel-imaging
#5
Hidenori Takeshima, Kanako Saitoh, Shuhei Nitta, Taichiro Shiodera, Tomoyuki Takeguchi, Shuhei Bannae, Shigehide Kuhara
PURPOSE: Dynamic MR techniques, such as cardiac cine imaging, benefit from shorter acquisition times. The goal of the present study was to develop a method that achieves short acquisition times, while maintaining a cost-effective reconstruction, for dynamic MRI. k - t sensitivity encoding (SENSE) was identified as the base method to be enhanced meeting these two requirements. METHODS: The proposed method achieves a reduction in acquisition time by estimating the spatiotemporal (x - f) sensitivity without requiring the acquisition of the alias-free signals, typical of the k - t SENSE technique...
March 13, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/29540619/amide-proton-transfer-imaging-of-cavernous-malformation-in-the-cavernous-sinus
#6
Manisha Bohara, Kiyohisa Kamimura, Masanori Nakajo, Tomohide Yoneyama, Takashi Yoshiura
No abstract text is available yet for this article.
March 13, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/29526883/ethyl-pyruvate-improves-pulmonary-function-in-mice-with-bleomycin-induced-lung-injury-as-monitored-with-hyperpolarized-129-xe-mr-imaging
#7
Shota Hodono, Akihiro Shimokawa, Neil J Stewart, Yukiko Yamauchi, Renya Nishimori, Mami Yamane, Hirohiko Imai, Hideaki Fujiwara, Atsuomi Kimura
PURPOSE: High Mobility Group Box1 (HMGB1), which is one of the damage-associated molecular pattern molecules relating to various inflammatory diseases, has gained interest as a therapeutic target because of its involvement in wound healing processes. In the present study, we investigated HMGB1 as a potential therapeutic target in a model of lung fibrosis using a preclinical hyperpolarized 129 Xe (HPXe) MRI system. METHODS: Lung injury was induced by intra-peritoneal injection of bleomycin (BLM) in 19 mice...
March 9, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/29526882/thin-slice-free-breathing-pseudo-golden-angle-radial-stack-of-stars-with-gating-and-tracking-t1-weighted-acquisition-an-efficient-gadoxetic-acid-enhanced-hepatobiliary-phase-imaging-alternative-for-patients-with-unstable-breath-holding
#8
Kimihiro Kajita, Satoshi Goshima, Yoshifumi Noda, Hiroshi Kawada, Nobuyuki Kawai, Tomoyuki Okuaki, Masatoshi Honda, Masayuki Matsuo
PURPOSE: To compare four free-breathing scan techniques for gadoxetic acid-enhanced hepatobiliary phase imaging with conventional breath-hold scans. MATERIALS AND METHODS: Gadoxetic acid-enhanced hepatobiliary phase imaging with six image acquisition sets performed in 50 patients. Image acquisition sets included fat-suppressed 3D T1 -weighted turbo field echo with free-breathing pseudo-golden-angle radial stack-of-stars (FBRS) acquisition, FBRS with track (FBRST ), FBRS with gate and track (FBRSG&T ), thin-slice FBRS with gate and track (thin-slice FBRSG&T ), free-breathing Cartesian acquisition (CartesianFB ), and breath-hold Cartesian acquisition (CartesianBH )...
March 9, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/29515084/a-comparison-of-black-blood-t-2-mapping-sequences-for-carotid-vessel-wall-imaging-at-3t-an-assessment-of-accuracy-and-repeatability
#9
Jianmin Yuan, Andrew J Patterson, Pascal P R Ruetten, Scott A Reid, Jonathan H Gillard, Martin J Graves
PURPOSE: This study is to compare the accuracy of four different black-blood T2 mapping sequences in carotid vessel wall. METHODS: Four different black-blood T2 mapping sequences were developed and tested through phantom experiments and 17 healthy volunteers. The four sequences were: 1) double inversion-recovery (DIR) prepared 2D multi-echo spin-echo (MESE); 2) DIR-prepared 2D multi-echo fast spin-echo (MEFSE); 3) improved motion-sensitized driven-equilibrium (iMSDE) prepared 3D FSE and 4) iMSDE prepared 3D fast spoiled gradient echo (FSPGR)...
March 8, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/29515087/non-contrast-enhanced-t-1-mapping-of-dilated-cardiomyopathy-comparison-between-native-t-1-values-and-late-gadolinium-enhancement
#10
Fumi Yanagisawa, Yasuo Amano, Masaki Tachi, Keisuke Inui, Kuniya Asai, Shinichiro Kumita
PURPOSE: We sought to use non-contrast-enhanced T1 mapping to determine the native T1 values required to identify myocardial fibrosis in patients with dilated cardiomyopathy (DCM). METHODS: A total of 25 patients with DCM and 15 healthy controls were enrolled. All subjects underwent T1 mapping using modified look-locker inversion recovery, and the patients underwent late gadolinium-enhancement (LGE) imaging. Basal and mid-ventricular levels were divided into eight segments and the T1 value was measured in each segment...
March 7, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/29515086/mr-imaging-of-secondary-massive-ovarian-edema-caused-by-ovarian-metastasis-from-appendiceal-adenocarcinoma
#11
Yumiko Oishi Tanaka, Yutaka Takazawa, Motoki Matsuura, Kohei Omatsu, Nobuhiro Takeshima, Kiyoshi Matsueda
No abstract text is available yet for this article.
March 7, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/29515085/improved-3d-real-inversion-recovery-a-robust-imaging-technique-for-endolymphatic-hydrops-after-intravenous-administration-of-gadolinium
#12
Shinji Naganawa, Hisashi Kawai, Toshiaki Taoka, Michihiko Sone
No abstract text is available yet for this article.
March 7, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/29467359/evaluation-of-a-portable-doppler-ultrasound-gating-device-for-fetal-cardiac-mr-imaging-initial-results-at-1-5t-and-3t
#13
Fabian Kording, Bjoern P Schoennagel, Manuela Tavares de Sousa, Kai Fehrs, Gerhard Adam, Jin Yamamura, Christian Ruprecht
PURPOSE: Fetal cardiac MRI has the potential to play an important role in the assessment of fetal cardiac pathologies, but it is up to now not feasible due to a missing gating method. The purpose of this work was the evaluation of Doppler ultrasound (DUS) for external fetal cardiac gating with regard to compatibility, functionality, and reliability. Preliminary results were assessed performing fetal cardiac MRI. METHODS: An MRI conditional DUS device was developed to obtain a gating signal from the fetal heart...
February 21, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/29434092/water-diffusion-in-the-brain-of-chronic-hypoperfusion-model-mice-a-study-considering-the-effect-of-blood-flow
#14
Takuya Urushihata, Hiroyuki Takuwa, Chie Seki, Yasuhiko Tachibana, Manami Takahashi, Jeff Kershaw, Yuhei Takado, Ichio Aoki, Makoto Higuchi, Hiroshi Ito, Takayuki Obata
PURPOSE: Chronic cerebral hypoperfusion model mice were created by unilateral common carotid artery occlusion (UCCAO) surgery, which does not cause cerebral infarction, but which does cause long-term reduction in cerebral blood flow (CBF) to the occluded side. Cognitive dysfunction in this mouse model has been demonstrated in behavioral experiments, but neuron density change was not found in a previous positron emission tomography (PET) study. As a next step, in this study we investigated the injury of neuronal fibers in chronic cerebral hypoperfusion model mice using diffusion tensor imaging (DTI)...
February 13, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/29386458/quantitative-t-2-mapping-of-knee-cartilage-comparison-between-the-synthetic-mr-imaging-and-the-cpmg-sequence
#15
Seung Hyun Lee, Young Han Lee, Ho-Taek Song, Jin-Suck Suh
The purpose was to evaluate the feasibility of quantitative MRI T2 mapping based on the quantitative MRI (QRAPMASTER) sequence for the quantitative assessment of knee cartilage. The T2 values from the phantom study showed excellent correlation between the two techniques (r2 = 0.998). The cartilage T2 values exhibited strong correlations (r2 = 0.867-0.982). Quantitative MRI (qMRI) T2 mapping can be used as an alternative to multi-echo T2 mapping, with relatively short scan time.
February 1, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/29386457/giant-cell-tumors-of-the-bone-changes-in-image-features-after-denosumab-administration
#16
Sota Oguro, Shigeo Okuda, Hiroaki Sugiura, Shunsuke Matsumoto, Aya Sasaki, Michiro Susa, Hideo Morioka, Masahiro Jinzaki
PURPOSE: To assess the clinical importance in the feature change in giant cell tumors of the bone (GCTB) after denosumab treatment, detected by MRI. METHODS: In 12 patients, MRI and CT of GCTB obtained before and after the treatment retrospectively compared. The tumor size, the signal intensity (SI) ratio between the solid part of the GCTB and muscle, cystic part size, gadolinium enhancement and apparent diffusion coefficient (ADC) value were measured on MRI. The bone formation in the tumor was observed on CT and X-ray...
February 1, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/29386472/assessment-of-the-quality-of-breast-mr-imaging-using-the-modified-dixon-method-and-frequency-selective-fat-suppression-a-phantom-study
#17
Yasuo Takatsu, Katsusuke Kyotani, Tsuyoshi Ueyama, Tosiaki Miyati, Kenichirou Yamamura, Atsushi Andou
To obtain objective and concrete data by physically assessing the quality of breast magnetic resonance images based on the fat-suppression effect by the modified Dixon method (mDixon) and frequency-selective fat suppression (e-Thrive) using an original lipid-content breast phantom that could easily reveal the influence of non-uniform fat suppression in breast magnetic resonance imaging. The fat-suppression uniformity was approximately seven times superior when using mDixon compared with when using e-Thrive...
January 30, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/29367513/gadolinium-based-contrast-media-cerebrospinal-fluid-and-the-glymphatic-system-possible-mechanisms-for-the-deposition-of-gadolinium-in-the-brain
#18
Toshiaki Taoka, Shinji Naganawa
After Kanda's first report in 2014 on gadolinium (Gd) deposition in brain tissue, a considerable number of studies have investigated the explanation for the observation. Gd deposition in brain tissue after repeated administration of gadolinium-based contrast medium (GBCM) has been histologically proven, and chelate stability has been shown to affect the deposition. However, the mechanism for this deposition has not been fully elucidated. Recently, a hypothesis was introduced that involves the 'glymphatic system', which is a coined word that combines 'gl' for glia cell and 'lymphatic' system...
January 25, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/29343661/immobilization-technique-for-high-resolution-mr-imaging-of-the-testes
#19
Masayuki Yamaguchi, Hirofumi Fujii
Techniques for testis immobilization can facilitate high-resolution MR imaging applications for testicular diseases by assuring good positioning of the testis on small radiofrequency coils and reducing motion artifacts. We tested negative pressure suction to immobilize the testis of rats during MR image acquisitions. Suction pressure between -5 and -10 kPa assured good positioning, suppressed motion artifacts, and allowed the observation of blood vessels and seminiferous tubules.
January 18, 2018: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/29343660/mr-guided-focused-ultrasound-for-uterine-fibroids-a-preliminary-study-of-relationship-between-the-treatment-outcomes-and-factors-of-mr-images-including-elastography
#20
Shintaro Ichikawa, Utaroh Motosugi, Makiko Omori, Katsuhiro Sano, Yoshie Omiya, Shuji Hirata, Hiroshi Onishi
We evaluated the value of magnetic resonance elastography (MRE) for the prediction of response to magnetic resonance-guided focused ultrasound (MRgFUS) for uterine fibroids. Eleven patients were enrolled. A fractional change of >30% in Symptoms Severity Score (SSS) was defined as a 'substantial symptomatic improvement' at 12 months after treatment. The fractional stiffness value reduction in the patients with a substantial improvement in SSS was significantly higher than that in those without (P = 0.0446)...
January 18, 2018: Magnetic Resonance in Medical Sciences: MRMS
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