Journals Magnetic Resonance in Medical ...

Magnetic Resonance in Medical Sciences : MRMS
Barbara J Fueger, Raoul Varga, Panagiotis Kapetas, Nina Pötsch, Thomas H Helbich, Pascal A T Baltzer, Paola Clauser
PURPOSE: Gadolinium-based contrast media (GBCM) may affect apparent diffusion coefficient measurements on diffusion-weighted imaging. We aimed at investigating the effect of GBCM and inter-reader variation on intravoxel incoherent motion (IVIM) parameters in breast lesions. METHODS: A total of 89 patients referred to 3T breast MRI with at least one histologically verified lesion were included. IVIM data were acquired using a single-shot echo planar imaging sequence before and after GBCM administration...
July 13, 2024: Magnetic Resonance in Medical Sciences: MRMS
Shuki Maruyama, Hidenori Takeshima
PURPOSE: To develop a new method to generate synthetic MR spectroscopic imaging (MRSI) data for training machine learning models. METHODS: This study targeted routine MRI examination protocols with single voxel spectroscopy (SVS). A novel model derived from pix2pix generative adversarial networks was proposed to generate synthetic MRSI data using MRI and SVS data as inputs. T1- and T2-weighted, SVS, and reference MRSI data were acquired from healthy brains with clinically available sequences...
July 12, 2024: Magnetic Resonance in Medical Sciences: MRMS
Cong Shang, Shohei Inui, Daita Kaneda, Yuto Uchida, Hiroshi Toyama, Keita Sakurai, Yoshio Hashizume
PURPOSE: Voxel-based morphometry (VBM) is widely used to investigate white matter (WM) atrophy in patients with progressive supranuclear palsy (PSP). In contrast to high-resolution 3D T1-weighted imaging such as magnetization-prepared rapid acquisition with gradient echo (MPRAGE) sequences, the utility of other 3D sequences has not been sufficiently evaluated. This study aimed to assess the feasibility of using a 3D fast low-angle shot sequence captured as a localizer image (L3DFLASH) for VBM analysis of WM atrophy patterns in patients with PSP...
July 11, 2024: Magnetic Resonance in Medical Sciences: MRMS
Masami Goto, Koji Kamagata, Christina Andica, Kaito Takabayashi, Wataru Uchida, Tsubasa Goto, Takuya Yuzawa, Yoshiro Kitamura, Taku Hatano, Nobutaka Hattori, Shigeki Aoki, Hajime Sakamoto, Yasuaki Sakano, Shinsuke Kyogoku, Hiroyuki Daida
PURPOSE: We developed new deep learning-based hierarchical brain segmentation (DLHBS) method that can segment T1-weighted MR images (T1WI) into 107 brain subregions and calculate the volume of each subregion. This study aimed to evaluate the repeatability and reproducibility of volume estimation using DLHBS and compare them with those of representative brain segmentation tools such as statistical parametric mapping (SPM) and FreeSurfer (FS). METHODS: Hierarchical segmentation using multiple deep learning models was employed to segment brain subregions within a clinically feasible processing time...
July 2, 2024: Magnetic Resonance in Medical Sciences: MRMS
Ryuji Shimada, Keitaro Sofue, Yoshiko Ueno, Tetsuya Wakayama, Takeru Yamaguchi, Eisuke Ueshima, Akiko Kusaka, Masatoshi Hori, Takamichi Murakami
PURPOSE: To compare the utility of thin-slice fat-suppressed single-shot T2-weighted imaging (T2WI) with deep learning image reconstruction (DLIR) and conventional fast spin-echo T2WI with DLIR for evaluating pancreatic protocol. METHODS: This retrospective study included 42 patients (mean age, 70.2 years) with pancreatic cancer who underwent gadoxetic acid-enhanced MRI. Three fat-suppressed T2WI, including conventional fast-spin echo with 6 mm thickness (FSE 6 mm), single-shot fast-spin echo with 6 mm and 3 mm thickness (SSFSE 6 mm and SSFSE 3 mm), were acquired for each patient...
June 21, 2024: Magnetic Resonance in Medical Sciences: MRMS
Agah Karakuzu, Mathieu Boudreau, Nikola Stikov
MRI has progressed significantly with the introduction of advanced computational methods and novel imaging techniques, but their wider adoption hinges on their reproducibility. This concise review synthesizes reproducible research insights from recent MRI articles to examine the current state of reproducibility in neuroimaging, highlighting key trends and challenges. It also provides a custom generative pretrained transformer (GPT) model, designed specifically for aiding in an automated analysis and synthesis of information pertaining to the reproducibility insights associated with the articles at the core of this review...
June 19, 2024: Magnetic Resonance in Medical Sciences: MRMS
Narjes Jaafar, David C Alsop
Arterial spin labeling (ASL), a non-invasive MRI technique, has emerged as a valuable tool for researchers that can measure blood flow and related parameters. This review aims to provide a qualitative overview of the technical principles and recent developments in ASL and to highlight its potential clinical applications. A growing literature demonstrates impressive ASL sensitivity to a range of neuropathologies and treatment responses. Despite its potential, challenges persist in the translation of ASL to widespread clinical use, including the lack of standardization and the limited availability of comprehensive training...
June 14, 2024: Magnetic Resonance in Medical Sciences: MRMS
Sandhitsu R Das, Ademola Ilesanmi, David A Wolk, James C Gee
The most commonly used neuroimaging biomarkers of brain structure, particularly in neurodegenerative diseases, have traditionally been summary measurements from ROIs derived from structural MRI, such as volume and thickness. Advances in MR acquisition techniques, including high-field imaging, and emergence of learning-based methods have opened up opportunities to interrogate brain structure in finer detail, allowing investigators to move beyond macrostructural measurements. On the one hand, superior signal contrast has the potential to make appearance-based metrics that directly analyze intensity patterns, such as texture analysis and radiomics features, more reliable...
June 14, 2024: Magnetic Resonance in Medical Sciences: MRMS
Felix W Wehrli
The metabolic rate of oxygen (MRO2 ) is fundamental to tissue metabolism. Determination of MRO2 demands knowledge of the arterio-venous difference in hemoglobin-bound oxygen concentration, typically expressed as oxygen extraction fraction (OEF), and blood flow rate (BFR). MRI is uniquely suited for measurement of both these quantities, yielding MRO2 in absolute physiologic units of µmol O2 min-1 /100 g tissue. Two approaches are discussed, both relying on hemoglobin magnetism. Emphasis will be on cerebral oxygen metabolism expressed in terms of the cerebral MRO2 (CMRO2 ), but translation of the relevant technologies to other organs, including kidney and placenta will be touched upon as well...
June 13, 2024: Magnetic Resonance in Medical Sciences: MRMS
Hiromasa Takemura, John A Kruper, Toshikazu Miyata, Ariel Rokem
Diffusion-weighted MRI (dMRI) provides a unique non-invasive view of human brain tissue properties. The present review article focuses on tractometry analysis methods that use dMRI to assess the properties of brain tissue within the long-range connections comprising brain networks. We focus specifically on the major white matter tracts that convey visual information. These connections are particularly important because vision provides rich information from the environment that supports a large range of daily life activities...
June 12, 2024: Magnetic Resonance in Medical Sciences: MRMS
Atsuomi Kimura, Akihiro Shimokawa, Neil J Stewart, Hirohiko Imai, Hideaki Fujiwara
PURPOSE: Chronic obstructive pulmonary disease (COPD) is a complex multisystem disease associated with comorbidities outside the lungs. The aim of this study was to measure changes in metrics of pulmonary gas exchange function and brain tissue metabolism in a mouse model of COPD using hyperpolarized 129 Xe (HP 129 Xe) MRI/MR spectroscopy (MRS) and investigate the relationship between the metrics of lung and brain. METHODS: COPD phenotypes were induced in 15 mice by 6-week administration of cigarette smoke extract (CSE) and lipopolysaccharide (LPS)...
June 6, 2024: Magnetic Resonance in Medical Sciences: MRMS
Yuko Someya, Mami Iima, Hirohiko Imai, Hiroyoshi Isoda, Tsuyoshi Ohno, Masako Kataoka, Denis Le Bihan, Yuji Nakamoto
PURPOSE: We aimed to investigate the changes in intravoxel incoherent motion (IVIM) and diffusion parameters between in vivo and post-mortem conditions and the time dependency of these parameters using two different mouse tumor models with different vessel lumen sizes. METHODS: Six B16 and six MDA-MB-231 xenograft mice were scanned using 7 Tesla MRI under both in vivo/post-mortem conditions. Diffusion weighted imaging with 17 b-values (0-3000 s/mm2 ) were obtained at two diffusion times (9 and 27...
May 25, 2024: Magnetic Resonance in Medical Sciences: MRMS
Takahide Kakigi, Ryo Sakamoto, Ryuzo Arai, Akira Yamamoto, Shinichi Kuriyama, Yuichiro Sano, Rimika Imai, Hitomi Numamoto, Kanae Kawai Miyake, Tsuneo Saga, Shuichi Matsuda, Yuji Nakamoto
PURPOSE: This study was conducted to evaluate whether thin-slice 2D fat-saturated proton density-weighted images of the shoulder joint in three imaging planes combined with parallel imaging, partial Fourier technique, and denoising approach with deep learning-based reconstruction (dDLR) are more useful than 3D fat-saturated proton density multi-planar voxel images. METHODS: Eighteen patients who underwent MRI of the shoulder joint at 3T were enrolled. The denoising effect of dDLR in 2D was evaluated using coefficient of variation (CV)...
May 22, 2024: Magnetic Resonance in Medical Sciences: MRMS
Kazuki Oyama, Mariko Kurashina, Fumihito Ichinohe, Akira Yamada, Yoshihiro Kitoh, Hayato Hayashihara, Shuya Fujihara, Marcel D Nickel, Katsuya Maruyama, Yasunari Fujinaga
PURPOSE: To evaluate how the relationship between respiratory interval (RI) and temporal resolution (TR) impacts image quality in free-breathing abdominal MRI (FB-aMRI) using golden-angle radial sparse parallel (GRASP). METHODS: Ten healthy volunteers (25.9 ± 2.5 years, four women) underwent 2 mins free-breathing fat-suppression T1-weighted imaging using GRASP at RIs of 3 and 5s (RI3 and RI5 , respectively) and retrospectively reconstructed at TR of 1...
May 17, 2024: Magnetic Resonance in Medical Sciences: MRMS
Masato Kiriki, Yasuo Takatsu, Tosiaki Miyati, Noriko Kotoura
PURPOSE: We aimed to evaluate the quality of various 3D T1 -weighted images (T1 WIs) of the stent lumen using a carotid stent phantom and determine the suitable T1 WI sequence for visualization of the stent lumen after carotid artery stenting. METHODS: The carotid stent phantom consisted of polypropylene tubes that mimicked common carotid arteries with and without stenting. On 1.5T and 3.0T MRI scanners, transverse T1 WIs of the carotid stent phantom were obtained using 3D turbo spin-echo (TSE), 3D fast field-echo (3D-FFE), and 3D turbo field echo volumetric interpolated breath-hold examination (VIBE) under clinical conditions...
May 16, 2024: Magnetic Resonance in Medical Sciences: MRMS
Hiroko Satake, Fumie Kinoshita, Satoko Ishigaki, Keita Kato, Yusuke Jo, Satoko Shimada, Norikazu Masuda, Shinji Naganawa
PURPOSE: To investigate the predictive performance of radiomic features extracted from breast MRI for upgrade of ductal carcinoma in situ (DCIS) to invasive carcinoma. METHODS: This retrospective study included 71 women with DCIS lesions diagnosed preoperatively by biopsy. All women underwent breast dynamic contrast-enhanced (DCE) MRI of the breast, which included pre-contrast and five post-contrast phases continuously with a time resolution of 60s. Lesion segmentation was performed manually, and 144 radiomic features of the lesions were extracted from T2-weighted images (T2WI), pre-contrast T1-weighted images (T1WI), and post-contrast 1st, 2nd, and 5th phase subtraction images on DCE-MRI...
May 15, 2024: Magnetic Resonance in Medical Sciences: MRMS
Roh-Eul Yoo, Seung Hong Choi
Despite its superior soft tissue contrast and non-invasive nature, MRI requires long scan times due to its intrinsic signal acquisition principles, a main drawback which technological advancements in MRI have been focused on. In particular, scan time reduction is a natural requirement in neuroimaging due to detailed structures requiring high resolution imaging and often volumetric (3D) acquisitions, and numerous studies have recently attempted to harness deep learning (DL) technology in enabling scan time reduction and image quality improvement...
April 27, 2024: Magnetic Resonance in Medical Sciences: MRMS
Jongho Lee, Sooyeon Ji, Se-Hong Oh
In MRI, researchers have long endeavored to effectively visualize myelin distribution in the brain, a pursuit with significant implications for both scientific research and clinical applications. Over time, various methods such as myelin water imaging, magnetization transfer imaging, and relaxometric imaging have been developed, each carrying distinct advantages and limitations. Recently, an innovative technique named as magnetic susceptibility source separation has emerged, introducing a novel surrogate biomarker for myelin in the form of a diamagnetic susceptibility map...
April 20, 2024: Magnetic Resonance in Medical Sciences: MRMS
Shinji Naganawa, Rintaro Ito, Mariko Kawamura, Toshiaki Taoka, Tadao Yoshida, Michihiko Sone
PURPOSE: The endolymph of the inner ear, vital for balance and hearing, has long been considered impermeable to intravenously administered gadolinium-based contrast agents (GBCAs) due to the tight blood-endolymph barrier. However, anecdotal observations suggested potential GBCA entry in delayed heavily T2-weighted 3D-real inversion recovery (IR) MRI scans. This study systematically investigated GBCA distribution in the endolymph using this 3D-real IR sequence. METHODS: Forty-one patients suspected of endolymphatic hydrops (EHs) underwent pre-contrast, 4-h, and 24-h post-contrast 3D-real IR imaging...
April 3, 2024: Magnetic Resonance in Medical Sciences: MRMS
Toshiaki Taoka, Rintaro Ito, Rei Nakamichi, Toshiki Nakane, Hisashi Kawai, Shinji Naganawa
More than 5 years have passed since the Diffusion Tensor Image Analysis ALong the Perivascular Space (DTI-ALPS) method was proposed with the intention of evaluating the glymphatic system. This method is handy due to its noninvasiveness, provision of a simple index in a straightforward formula, and the possibility of retrospective analysis. Therefore, the ALPS method was adopted to evaluate the glymphatic system for many disorders in many studies. The purpose of this review is to look back and discuss the ALPS method at this moment...
April 2, 2024: Magnetic Resonance in Medical Sciences: MRMS
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