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Journals Magnetic Resonance in Medical ...

Magnetic Resonance in Medical Sciences : MRMS

https://read.qxmd.com/read/38123345/verifying-the-accuracy-of-hemodynamic-analysis-using-high-spatial-resolution-3d-phase-contrast-mr-imaging-on-a-7t-mr-system-comparison-with-a-3t-system
#21
JOURNAL ARTICLE
Shunsuke Tajima, Haruo Isoda, Masaki Fukunaga, Yoshiaki Komori, Shinji Naganawa, Norihiro Sadato
PURPOSE: Hemodynamics is important in the initiation, growth, and rupture of intracranial aneurysms. Since intracranial aneurysms are small, a high-field MR system with high spatial resolution and high SNR is desirable for this hemodynamic analysis. The purpose of this study was to investigate whether the accuracy of MR fluid dynamic (MRFD) results based on 3D phase-contrast MR (3D PC MR, non-electrocardiogram[ECG]-gated 4D Flow MRI) data from a human cerebrovascular phantom and human healthy subjects obtained by a 7T MR system was superior to those by a 3T MR system...
December 20, 2023: Magnetic Resonance in Medical Sciences: MRMS
https://read.qxmd.com/read/37952943/intracranial-air-absorption-through-arachnoid-granulation-new-considerations-from-transsphenoidal-surgery-and-implications-for-neurofluid-dynamics
#22
JOURNAL ARTICLE
Shinji Naganawa, Rintaro Ito, Mariko Kawamura, Toshiaki Taoka
Postsurgery intracranial air usually diminishes, presumably merging with cerebrospinal fluid (CSF) and venous circulation. Our study presents two transsphenoidal surgery cases, highlighting potential air absorption by arachnoid granulation (AG)-an underexplored phenomenon. AG has long been deemed pivotal for CSF absorption, but recent perspectives suggest a significant role in waste clearance, neuroinflammation, and neuroimmunity. These cases may stimulate renewed research on the multifaceted role of AG in neurofluid dynamics and potentially elucidate further AG functions...
November 10, 2023: Magnetic Resonance in Medical Sciences: MRMS
https://read.qxmd.com/read/37952942/evaluating-reproducibility-of-the-adc-and-distortion-in-diffusion-weighted-imaging-dwi-with-reverse-encoding-distortion-correction-rdc
#23
JOURNAL ARTICLE
Hitomi Numamoto, Koji Fujimoto, Kanae Kawai Miyake, Yasutaka Fushimi, Sachi Okuchi, Rimika Imai, Hiroki Kondo, Tsuneo Saga, Yuji Nakamoto
PURPOSE: To compare image distortion and reproducibility of quantitative values between reverse encoding distortion correction (RDC) diffusion-weighted imaging (DWI) and conventional DWI techniques in a phantom study and in healthy volunteers. METHODS: This prospective study was conducted with the approval of our institutional review board. Written informed consent was obtained from each participant. RDC-DWIs were created from images obtained at 3T in three orthogonal directions in a phantom and in 10 participants (mean age, 70...
November 10, 2023: Magnetic Resonance in Medical Sciences: MRMS
https://read.qxmd.com/read/37914371/effect-of-the-surrounding-magnetic-environment-of-temporal-bone-on-the-fluid-signal-intensity-in-human-inner-ear-using-a-combined-t2-preparation-pulse-and-fluid-attenuated-inversion-pulse-technique
#24
JOURNAL ARTICLE
Nobuyasu Ichinose, Kentaro Haraoka, Takaya Mori, Masanori Ozaki, Akira Taniguchi
PURPOSE: Recently, the utility of non-contrast MR endolymphatic hydrops imaging was reported, but the pitfall was indicated based on T2 preparation pulse sensitiveness to local static magnetic field (B0) inhomogeneity. The purpose of this study is to clarify the effects of surrounding magnetic environment of temporal bone to lymphatic fluid signal intensity on the T2 preparation and fluid attenuated inversion recovery pulse combination (T2prep 3D-FLAIR) technique in human inner ear study...
November 2, 2023: Magnetic Resonance in Medical Sciences: MRMS
https://read.qxmd.com/read/37899224/high-resolution-diffusion-weighted-imaging-of-the-prostate-using-multiplexed-sensitivity-encoding-comparison-with-the-conventional-and-reduced-field-of-view-techniques
#25
JOURNAL ARTICLE
Atsushi Nakamoto, Hiromitsu Onishi, Takahiro Tsuboyama, Hideyuki Fukui, Takashi Ota, Keigo Yano, Kengo Kiso, Toru Honda, Hiroyuki Tarewaki, Yoshihiro Koyama, Mitsuaki Tatsumi, Noriyuki Tomiyama
PURPOSE: To compare objective and subjective image quality, lesion conspicuity, and apparent diffusion coefficient (ADC) of high-resolution multiplexed sensitivity-encoding diffusion-weighted imaging (MUSE-DWI) with conventional DWI (c-DWI) and reduced FOV DWI (rFOV-DWI) in prostate MRI. METHODS: Forty-seven patients who underwent prostate MRI, including c-DWI, rFOV-DWI, and MUSE-DWI, were retrospectively evaluated. SNR and ADC of normal prostate tissue and contrast-to-noise ratio (CNR) and ADC of prostate cancer (PCa) were measured and compared between the three sequences...
October 28, 2023: Magnetic Resonance in Medical Sciences: MRMS
https://read.qxmd.com/read/37899254/low-b-value-diffusion-tensor-imaging-to-analyze-the-dynamics-of-cerebrospinal-fluid-resolving-intravoxel-pseudorandom-motion-into-ordered-and-disordered-motions
#26
JOURNAL ARTICLE
Yoshitaka Bito, Hisaaki Ochi, Ryuji Shirase, Wataru Yokohama, Kuniaki Harada, Kohsuke Kudo
PURPOSE: Analysis of cerebrospinal fluid (CSF) dynamics may be beneficial for understanding the mechanisms and diagnosis of several neurological diseases. Low b-value diffusion tensor imaging (low-b DTI) is useful for observing the slow and complex motion of the CSF. Theoretically, a mathematical framework suggests that low-b DTI provides the variance of the pseudorandom motion of the CSF. Furthermore, low-b DTI could provide comprehensive information on fluid dynamics. Accordingly, we proposed an analysis technique that resolves intravoxel pseudorandom motion into ordered (linear) and disordered (random) motions based on the mathematical framework...
October 27, 2023: Magnetic Resonance in Medical Sciences: MRMS
https://read.qxmd.com/read/37766549/microvascular-dysfunction-in-patients-with-idiopathic-dilated-cardiomyopathy-quantitative-assessment-with-phase-contrast-cine-mr-imaging-of-the-coronary-sinus
#27
JOURNAL ARTICLE
Masafumi Takafuji, Masaki Ishida, Satoshi Nakamura, Kei Nakata, Haruno Ito, Takanori Kokawa, Kensuke Domae, Suguru Araki, Shiro Nakamori, Junko Ishiura, Kaoru Dohi, Hajime Sakuma
PURPOSE: The purposes of this study were to compare global coronary flow reserve (CFR) between patients with idiopathic dilated cardiomyopathy (DCM) and risk-matched controls using cardiac MRI (CMR), and to evaluate the relationship between global CFR and CMR left ventricular (LV) parameters. METHODS: Twenty-six patients with DCM and 26 risk-matched controls who underwent comprehensive CMR examination, including stress-rest coronary sinus flow measurement by phase contrast (PC) cine CMR were retrospectively studied...
September 28, 2023: Magnetic Resonance in Medical Sciences: MRMS
https://read.qxmd.com/read/37690843/nonlinear-gradient-field-mapping-using-a-spherical-grid-phantom-for-3-and-7-tesla-mr-imaging-systems-equipped-with-high-performance-gradient-coils
#28
JOURNAL ARTICLE
Ryoichi Kose, Katsumi Kose, Koji Fujimoto, Tomohisa Okada, Daiki Tamada, Utaroh Motosugi
Recent high-performance gradient coils are fabricated mainly at the expense of spatial linearity. In this study, we measured the spatial nonlinearity of the magnetic field generated by the gradient coils of two MRI systems with high-performance gradient coils. The nonlinearity of the gradient fields was measured using 3D gradient echo sequences and a spherical phantom with a built-in lattice structure. The spatial variation of the gradient field was approximated to the 3rd order polynomials. The coefficients of the polynomials were calculated using the steepest descent method...
September 9, 2023: Magnetic Resonance in Medical Sciences: MRMS
https://read.qxmd.com/read/37690836/evaluating-t1-t2-relaxation-and-proton-density-in-normal-brain-using-synthetic-mri-with-fast-imaging-protocol
#29
JOURNAL ARTICLE
Zuofeng Zheng, Yawen Liu, Hongxia Yin, Pengling Ren, Tingting Zhang, Jiafei Yang, Zhenchang Wang
Synthetic MRI is being increasingly used for the quantification of brain longitudinal relaxation time (T1), transverse relaxation time (T2), and proton density (PD) values. However, the effect of fast imaging protocols on these quantitative values has not been fully estimated. The purpose of this study was to investigate the effect of fast scan parameters on T1, T2, and PD measured with a multi-dynamic multi-echo (MDME) sequence of normal brain at 3.0T. Thirty-four volunteers were scanned using 3 MDME sequences with different scan times (named Fast, 2 min, 29 sec; Routine, 4 min, 07 sec; and Research, 7 min, 46 sec, respectively)...
September 8, 2023: Magnetic Resonance in Medical Sciences: MRMS
https://read.qxmd.com/read/37661369/novel-t1-analysis-method-to-address-reduced-measurement-accuracy-due-to-irregular-heart-rate-variability-in-myocardial-t1-mapping-using-polarity-corrected-inversion-time-preparation
#30
JOURNAL ARTICLE
Yuta Endo, Sanae Takahashi, Haruna Shibo, Makoto Amanuma, Kuninori Kobayashi, Shigehide Kuhara
PURPOSE: Polarity-corrected inversion time preparation (PCTIP), a myocardial T1 mapping technique, is expected to reduce measurement underestimation in the modified Look-Locker inversion recover method. However, measurement precision is reduced, especially for heart rate variability. We devised an analysis using a recurrence formula to overcome this problem and showed that it improved the measurement accuracy, especially at high heart rates. Therefore, this study aimed to determine the effect of this analysis on the accuracy and precision of T1 measurements for irregular heart rate variability...
September 4, 2023: Magnetic Resonance in Medical Sciences: MRMS
https://read.qxmd.com/read/37661425/deep-learning-reconstruction-to-improve-the-quality-of-mr-imaging-evaluating-the-best-sequence-for-t-category-assessment-in-non-small-cell-lung-cancer-patients
#31
JOURNAL ARTICLE
Daisuke Takenaka, Yoshiyuki Ozawa, Kaori Yamamoto, Maiko Shinohara, Masato Ikedo, Masao Yui, Yuka Oshima, Nayu Hamabuchi, Hiroyuki Nagata, Takahiro Ueda, Hirotaka Ikeda, Akiyoshi Iwase, Takeshi Yoshikawa, Hiroshi Toyama, Yoshiharu Ohno
PURPOSE: Deep learning reconstruction (DLR) has been recommended as useful for improving image quality. Moreover, compressed sensing (CS) or DLR has been proposed as useful for improving temporal resolution and image quality on MR sequences in different body fields. However, there have been no reports regarding the utility of DLR for image quality and T-factor assessment improvements on T2-weighted imaging (T2WI), short inversion time (TI) inversion recovery (STIR) imaging, and unenhanced- and contrast-enhanced (CE) 3D fast spoiled gradient echo (GRE) imaging with and without CS in comparison with thin-section multidetector-row CT (MDCT) for non-small cell lung cancer (NSCLC) patients...
September 1, 2023: Magnetic Resonance in Medical Sciences: MRMS
https://read.qxmd.com/read/37532585/microstructural-abnormalities-in-the-contralateral-normal-appearing-white-matter-of-glioblastoma-patients-evaluated-with-advanced-diffusion-imaging
#32
JOURNAL ARTICLE
Barış Genç, Kerim Aslan, Ali Özçağlayan, Lütfi İncesu
PURPOSE: Glioblastoma patients develop recurrence in the opposite hemisphere far from the primary tumor site even after complete resection. This is one of the main reasons for short disease survival. Our aim in this study is to detect microstructural changes in the contralateral hemisphere of glioblastoma patients using different diffusion models with the fully automated tract-based spatial statistics (TBSS) method. METHODS: Fourteen right-sided and eleven left-sided glioblastoma patients without any treatment and eighteen age- and gender-matched controls were included in the study...
August 1, 2023: Magnetic Resonance in Medical Sciences: MRMS
https://read.qxmd.com/read/37532584/current-state-of-artificial-intelligence-in-clinical-applications-for-head-and-neck-mr-imaging
#33
JOURNAL ARTICLE
Noriyuki Fujima, Koji Kamagata, Daiju Ueda, Shohei Fujita, Yasutaka Fushimi, Masahiro Yanagawa, Rintaro Ito, Takahiro Tsuboyama, Mariko Kawamura, Takeshi Nakaura, Akira Yamada, Taiki Nozaki, Tomoyuki Fujioka, Yusuke Matsui, Kenji Hirata, Fuminari Tatsugami, Shinji Naganawa
Due primarily to the excellent soft tissue contrast depictions provided by MRI, the widespread application of head and neck MRI in clinical practice serves to assess various diseases. Artificial intelligence (AI)-based methodologies, particularly deep learning analyses using convolutional neural networks, have recently gained global recognition and have been extensively investigated in clinical research for their applicability across a range of categories within medical imaging, including head and neck MRI...
August 1, 2023: Magnetic Resonance in Medical Sciences: MRMS
https://read.qxmd.com/read/37518672/numerical-and-clinical-evaluation-of-the-robustness-of-open-source-networks-for-parallel-mr-imaging-reconstruction
#34
JOURNAL ARTICLE
Naoto Fujita, Suguru Yokosawa, Toru Shirai, Yasuhiko Terada
PURPOSE: Deep neural networks (DNNs) for MRI reconstruction often require large datasets for training. Still, in clinical settings, the domains of datasets are diverse, and how robust DNNs are to domain differences between training and testing datasets has been an open question. Here, we numerically and clinically evaluate the generalization of the reconstruction networks across various domains under clinically practical conditions and provide practical guidance on what points to consider when selecting models for clinical application...
July 28, 2023: Magnetic Resonance in Medical Sciences: MRMS
https://read.qxmd.com/read/37344409/comparison-of-slab-and-pencil-beam-labeling-in-spin-labeled-mr-imaging-for-pancreatic-juice-flow-visualization
#35
JOURNAL ARTICLE
Hideki Hoshi, Reiji Sugita, Yoshio Machida
The usefulness of a highly targeted pencil beam (PB) label was compared with the commonly used slab label for direct visualization of pancreaticobiliary reflux using the time-spatial labeling inversion pulse (time-SLIP) technique. Signal profiles of flow phantom images obtained with a 1.5T MRI were analyzed. Both labels had similar labeling capabilities, but the edge characteristics of the PB label were blunt. Next, sixty-eight patients were classified into two groups according to the angle of the pancreaticobiliary ducts, and the displacement of the pancreatic ducts in respiratory fluctuation was measured...
June 21, 2023: Magnetic Resonance in Medical Sciences: MRMS
https://read.qxmd.com/read/37258125/blockage-of-csf-outflow-in-rats-after-deep-cervical-lymph-node-ligation-observed-using-gd-based-mr-imaging
#36
JOURNAL ARTICLE
Naoya Kinota, Hiroyuki Kameda, Bai Xiawei, Takaaki Fujii, Daisuke Kato, Bunya Takahashi, Ryo Morita, Daisuke Abo, Ryusei Majima, Hiroshi Ishii, Kazuyuki Minowa, Kohsuke Kudo
PURPOSE: To investigate whether deep cervical lymph node (DCLN) ligation alters intracranial cerebrospinal fluid (CSF) tracer dynamics and outflow using a rat model with intrathecal dynamic contrast-enhanced (DCE) MRI. METHODS: Six bilateral DCLN-ligated and six sham-operated rats were subjected to DCE MRI with Gd-BTDO3A, and dynamic T1-weighted images were acquired. ROIs were collected from the CSF at the C1 level (CSF_C1), CSF between the olfactory bulbs (CSF_OB), CSF at the pituitary recess (CSF_PitR), and CSF at the pineal recess (CSF_PinR), upper nasal turbinate (UNT), olfactory bulbs, cerebrum, and the jugular region...
May 30, 2023: Magnetic Resonance in Medical Sciences: MRMS
https://read.qxmd.com/read/37245964/diagnostic-utility-of-an-adjusted-dwi-lexicon-using-multiple-b-values-to-evaluate-breast-lesions-in-combination-with-bi-rads
#37
JOURNAL ARTICLE
Aika Okazawa, Mami Iima, Masako Kataoka, Ryosuke Okumura, Sachiko Takahara, Tomotaka Noda, Taro Nishi, Takayoshi Ishimori, Yuji Nakamoto
PURPOSE: We aimed to investigate the diagnostic feasibility of an adjusted diffusion-weighted imaging (DWI) lexicon using multiple b values to assess breast lesions according to DWI-based breast imaging reporting and data system (BI-RADS). METHODS: This Institutional Review Board (IRB)-approved prospective study included 127 patients with suspected breast cancer. Breast MRI was performed using a 3T scanner. Breast DW images were acquired using five b-values of 0, 200, 800, 1000, and 1500 s/mm2 (5b-value DWI) on 3T MRI...
May 26, 2023: Magnetic Resonance in Medical Sciences: MRMS
https://read.qxmd.com/read/37183027/evaluating-biliary-malignancy-with-measured-and-calculated-ultra-high-b-value-diffusion-weighted-mr-imaging-at-3t
#38
JOURNAL ARTICLE
Minkyeong Kim, Tae Young Lee, Byeong Seong Kang, Woon Jung Kwon, Soyeoun Lim, Gyeong Min Park, Minseo Bang
PURPOSE: Although diffusion-weighted imaging (DWI) with ultra-high b-values is reported to be advantageous in the detection of some tumors, its applicability is not yet known in biliary malignancy. Therefore, this study aimed to evaluate the impact of measured b = 1400 s/mm2 (M1400) and calculated b = 1400 s/mm2 (C1400) DWI on image quality and quality of lesion discernibility using a modern 3T MR system compared to conventional b = 800 s/mm2 DWI (M800). METHODS: We evaluated 56 patients who had pathologically proven biliary malignancy...
May 13, 2023: Magnetic Resonance in Medical Sciences: MRMS
https://read.qxmd.com/read/37081646/increased-parenchymal-free-water-may-be-decreased-by-revascularization-surgery-in-patients-with-moyamoya-disease
#39
JOURNAL ARTICLE
Shoko Hara, Masaaki Hori, Koji Kamagata, Christina Andica, Motoki Inaji, Yoji Tanaka, Shigeki Aoki, Tadashi Nariai, Taketoshi Maehara
PURPOSE: Moyamoya disease (MMD) is a cerebrovascular disease associated with steno-occlusive changes in the arteries of the circle of Willis and with hemodynamic impairment. Previous studies have reported that parenchymal extracellular free water levels may be increased and the number of neurites may be decreased in patients with MMD. The aim of the present study was to investigate the postoperative changes in parenchymal free water and neurites and their relationship with cognitive improvement...
April 18, 2023: Magnetic Resonance in Medical Sciences: MRMS
https://read.qxmd.com/read/37045750/a-versatile-mr-elastography-research-tool-with-a-modified-motion-signal-to-noise-ratio-approach
#40
JOURNAL ARTICLE
Daiki Ito, Tetsushi Habe, Tomokazu Numano, Shigeo Okuda, Shigeyoshi Soga, Masahiro Jinzaki
PURPOSE: This study aimed to facilitate research progress in MR elastography (MRE) by providing a versatile and convenient application for MRE reconstruction, namely the MRE research tool (MRE-rTool). It can be used for a series of MRE image analyses, including phase unwrapping, arbitrary bandpass and directional filtering, noise assessment of the wave propagation image (motion SNR), and reconstruction of the elastogram in both 2D and 3D MRE acquisitions. To reinforce the versatility of MRE-rTool, the conventional method of motion SNR was modified into a new method that reflects the effects of image filtering...
April 12, 2023: Magnetic Resonance in Medical Sciences: MRMS
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