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Magnetic Resonance in Medical Sciences: MRMS

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https://www.readbyqxmd.com/read/28867760/in-vitro-study-of-serial-changes-to-carmustine-wafers-gliadel-with-mr-imaging-and-computed-tomography
#1
Satoshi Doishita, Taro Shimono, Tetsuya Yoneda, Eiji Yamada, Taro Tsukamoto, Daichi Takemori, Daisuke Kimura, Hiroyuki Tatekawa, Shinichi Sakamoto, Yukio Miki
PURPOSE: Implantation of carmustine wafers (Gliadel) in vivo is accompanied by characteristic serial changes on magnetic resonance imaging (MRI) and computed tomography (CT), such as transient hyperintensity of the wafers on T1-weighted images (T1WIs) and considerable gas accumulation in surgical resection cavities. The purpose of this study was to evaluate intrinsic imaging changes to carmustine wafers in vitro. METHODS: Three phantoms simulating a surgical resection cavity were constructed...
September 4, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28855470/technical-aspects-of-contrast-enhanced-mr-angiography-current-status-and-new-applications
#2
Stephen J Riederer, Eric G Stinson, Paul T Weavers
This article is based on a presentation at the meeting of the Japanese Society of Magnetic Resonance in Medicine in September 2016. The purpose is to review the technical developments which have contributed to the current status of contrast-enhanced magnetic resonance angiography (CE-MRA) and to indicate related emerging areas of study. Technical developments include magnetic resonance imaging (MRI) physics-based innovations as well as improvements in MRI engineering. These have collectively addressed not only early issues of timing and venous suppression but more importantly have led to an improvement in spatiotemporal resolution of CE-MRA of more than two orders of magnitude compared to early results...
August 31, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28835572/time-spatial-labeling-inversion-pulse-time-slip-with-pencil-beam-pulse-a-selective-labeling-technique-for-observing-cerebrospinal-fluid-flow-dynamics
#3
Shuhei Shibukawa, Tosiaki Miyati, Tetsu Niwa, Mitsunori Matsumae, Tetsuo Ogino, Tomohiko Horie, Yutaka Imai, Isao Muro
We assessed labeling region selectivity on time-spatial labeling inversion pulse (Time-SLIP) with pencil beam pulse (PB Time-SLIP) for the use of visualizing cerebrospinal fluid (CSF) flow dynamics. We compared the selectivity of labeling to the third and fourth ventricles between PB Time-SLIP and conventional Time-SLIP (cTime-SLIP) in eight volunteers and one patient using a 1.5T magnetic resonance imaging (MRI). PB Time-SLIP provided more selective labeling in CSF than cTime-SLIP, particularly in complex anatomical regions...
August 24, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28824051/factors-that-differentiate-between-endometriosis-associated-ovarian-cancer-and-benign-ovarian-endometriosis-with-mural-nodules
#4
Yasuhito Tanase, Ryuji Kawaguchi, Junko Takahama, Hiroshi Kobayashi
PURPOSE: Mural nodules and papillary projections can be seen in benign ovarian endometriosis (OE) and malignant transformation of OE (endometriosis-associated ovarian cancer [EAOC]), which can pose a challenging diagnostic dilemma to clinicians. We identify the preoperative imaging characteristics helpful to the differential diagnosis between benign OE with mural nodules and EAOC. MATERIALS AND METHODS: This was a retrospective study of 82 patients who were diagnosed pathologically to have OE with mural nodules (n = 42) and malignant transformations of these tumors (n = 40) at the Nara Medical University Hospital from January 2008 to January 2015...
August 21, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28819086/measurement-of-cerebrospinal-fluid-flow-dynamics-using-phase-contrast-mr-imaging-with-bilateral-jugular-vein-compression-a-feasibility-study-in-healthy-volunteers
#5
Shintaro Ichikawa, Utaroh Motosugi, Akihiro Okumura, Tatsuya Shimizu, Hiroshi Onishi
We measured the changes in the cerebrospinal fluid (CSF) flow dynamics after compression of the bilateral jugular veins using phase contrast-magnetic resonance imaging (PC-MRI). PC-MRI was performed in 10 healthy male volunteers using a 3T clinical scanner with a two-dimensional gradient echo sequence. We successfully measured the changes in CSF flow velocity using PC-MRI with and without compression of the bilateral jugular veins. The relative velocity range decreased by about 30% when the bilateral jugular veins were compressed...
August 16, 2017: 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
#6
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/mm(2)). 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...
August 16, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28819084/the-significance-of-lactate-and-lipid-peaks-for-predicting-primary-neuroepithelial-tumor-grade-with-proton-mr-spectroscopy
#7
Hisao Nakamura, Masatomo Doi, Takuya Suzuki, Yasuyuki Yoshida, Masahiro Hoshikawa, Masashi Uchida, Yuichiro Tanaka, Masayuki Takagi, Yasuo Nakajima
PURPOSE: (1)H-MRS is a non-invasive technique used to assess the metabolic activity of brain tumors. The technique is useful for the preoperative prediction of tumor grade, which is important for treatment planning and accurate prognosis. We used (1)H-MRS to study the lactate peak, which appears in various conditions, including hyperglycemia, ischemia, and hypoxia and lipid peak, which is associated with necrotic cells. The purpose of this study was to retrospectively examine the frequency and significance of lactate and lipid peaks in relation to brain tumor grade...
August 16, 2017: 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
#8
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 magnetic resonance angiography (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...
June 26, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28638001/comparison-between-glioblastoma-and-primary-central-nervous-system-lymphoma-using-mr-image-based-texture-analysis
#9
Akira Kunimatsu, Natsuko Kunimatsu, Kouhei Kamiya, Takeyuki Watadani, Harushi Mori, Osamu Abe
PURPOSE: To elucidate differences between glioblastoma (GBM) and primary central nervous system lymphoma (PCNSL) with magnetic resonance (MR) image-based texture features. METHODS: This was an Institutional Review Board (IRB)-approved retrospective study. Consecutive, pathologically proven, initially treated 44 patients with GBM and 16 patients with PCNSL were enrolled. We calculated a total of 67 image texture features on the largest contrast-enhancing lesion in each patient on post-contrast T1-weighted images...
June 22, 2017: 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
#10
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...
June 16, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28592709/relationship-between-contrast-enhancement-of-the-perivascular-space-in-the-basal-ganglia-and-endolymphatic-volume-ratio
#11
Toshio Ohashi, Shinji Naganawa, Toshio Katagiri, Kayao Kuno
PURPOSE: We routinely obtain the endolymphatic hydrops (EH) image using heavily T2-weighted three dimensional-fluid attenuated inversion recovery (hT2w-3D-FLAIR) imaging at 4 hours after intravenous administration of a single-dose of gadolinium-based contrast media (IV-SD-GBCM). While repeating the examination, we speculated that the contrast enhancement of the perivascular space (PVS) in the basal ganglia might be related to the degree of EH. Therefore, the purpose of this study was to investigate the relationship between the endolymphatic volume ratio (%ELvolume) and the signal intensity of the PVS (SI-PVS)...
June 8, 2017: 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
#12
Yuki Arita, Hirokazu Fujiwara, Jun Kurasawa, Suketaka Momoshima, Tsubasa Takizawa, Masahiro Jinzaki
No abstract text is available yet for this article.
June 8, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28566586/b1-power-optimization-for-chemical-exchange-saturation-transfer-imaging-a-phantom-study-using-egg-white-for-amide-proton-transfer-imaging-applications-in-the-human-brain
#13
Yuki Kanazawa, Yasutaka Fushimi, Naotaka Sakashita, Tomohisa Okada, Yoshiki Arakawa, Mitsue Miyazaki
The chemical exchange saturation transfer (CEST) effect on an egg white (EW) suspension was investigated for optimization of magnetization transfer (MT) power (B1,rms) and pH dependency with the addition of lactic acid. Applying a higher MT pulse, B1,rms, Z-spectrum shows higher asymmetry and the magnetisation transfer ratio (MTR)asym signal increases to around 1-3.5 ppm, indicating a higher CEST effect. Amide proton transfer (APT) at 3.5 ppm shows a signal elevation in MTRasym with the application of higher B1,rms power and high pH...
May 31, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28566585/ovarian-large-cell-neuroendocrine-carcinoma-associated-with-serous-carcinoma-correlation-of-pathology-with-mr-imaging
#14
Mayumi Takeuchi, Kenji Matsuzaki, Koichi Tsuneyama, Masato Nishimura, Eri Takiguchi, Masafumi Harada
No abstract text is available yet for this article.
May 31, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28552888/cylindrical-inversion-pulse-for-the-reduction-of-cardiac-motion-artifacts-in-contrast-enhanced-breast-mri
#15
Masami Yoneyama, Masanobu Nakamura, Yuriko Ozawa, Makoto Obara, Tomoyuki Okuaki, Satoshi Tatsuno, Ryuji Sashi, Seishi Sawano, Marc Van Cauteren
We proposed a simple technique for reduction of cardiac-related motion artifacts on contrast-enhanced images in the breast by using cylindrical regional-suppression technique (CREST) that can directly suppress the heart signals. The purpose of this study was to select the optimal scan parameters and to evaluate the feasibility in the breast. We demonstrated that the optimized CREST could dramatically reduce the cardiac-related flow artifacts without any penalty to the acquisition time, signal-to-noise ratio and contrast-enhanced lesion-to-parenchyma contrast...
May 29, 2017: 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
#16
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...
May 24, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28529249/improved-hydrops-imaging-of-endolymphatic-hydrops-after-intravenous-administration-of-gadolinium
#17
Shinji Naganawa, Hisashi Kawai, Toshiaki Taoka, Michihiko Sone
To improve the imaging protocol for the evaluation of endolymphatic hydrops after intravenous administration of a gadolinium-based contrast agent, we modified our previously reported hybrid of reversed image of positive endolymph signal and native image of positive perilymph signal (HYDROPS) method. Although the scan time of the new protocol was half that of the previous one, there were no significant differences between two protocols in the mean contrast noise ratio between the endolymph and perilymph and the area ratio of the endolymph size values in nine patients...
May 22, 2017: 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.
May 22, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28529247/mr-imaging-of-an-intramural-adenosarcoma-with-pathologic-correlation
#19
Shinya Fujii, Kanae Nosaka, Naoko Mukuda, Takeru Fukunaga, Shinya Sato, Toshihide Ogawa
No abstract text is available yet for this article.
May 22, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28515413/magnetic-susceptibility-changes-in-the-basal-ganglia-and-brain-stem-of-patients-with-wilson-s-disease-evaluation-with-quantitative-susceptibility-mapping
#20
Selim Doganay, Kazim Gumus, Gonca Koc, Ayse Kacar Bayram, Mehmet Sait Dogan, Duran Arslan, Hakan Gumus, Sureyya Burcu Gorkem, Saliha Ciraci, Halil Ibrahim Serin, Abdulhakim Coskun
OBJECTIVES: Wilson's disease (WD) is characterized with the accumulation of copper in the liver and brain. The objective of this study is to quantitatively measure the susceptibility changes of basal ganglia and brain stem of pediatric patients with neurological WD using quantitative susceptibility mapping (QSM) in comparison to healthy controls. METHODS: Eleven patients with neurological WD (mean age 15 ± 3.3 years, range 10-22 years) and 14 age-matched controls were prospectively recruited...
May 18, 2017: Magnetic Resonance in Medical Sciences: MRMS
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