journal
https://read.qxmd.com/read/38064137/fastptx-a-versatile-toolbox-for-rapid-joint-design-of-ptx-rf-and-gradient-pulses-using-pytorch-s-autodifferentiation
#21
JOURNAL ARTICLE
Dario Bosch, Klaus Scheffler
OBJECTIVE: With modern optimization methods, free optimization of parallel transmit pulses together with their gradient waveforms can be performed on-line within a short time. A toolbox which uses PyTorch's autodifferentiation for simultaneous optimization of RF and gradient waveforms is presented and its performance is evaluated. METHODS: MR measurements were performed on a 9.4T MRI scanner using a 3D saturated single-shot turboFlash sequence for [Formula: see text] mapping...
December 8, 2023: Magma
https://read.qxmd.com/read/38019377/automatic-segmentation-of-the-interscapular-brown-adipose-tissue-in-rats-based-on-deep-learning-using-the-dynamic-magnetic-resonance-fat-fraction-images
#22
JOURNAL ARTICLE
Chuanli Cheng, Bingxia Wu, Lei Zhang, Qian Wan, Hao Peng, Xin Liu, Hairong Zheng, Huimao Zhang, Chao Zou
OBJECTIVE: The study aims to propose an accurate labelling method of interscapular BAT (iBAT) in rats using dynamic MR fat fraction (FF) images with noradrenaline (NE) stimulation and then develop an automatic iBAT segmentation method using a U-Net model. MATERIALS AND METHODS: Thirty-four rats fed different diets or housed at different temperatures underwent successive MR scans before and after NE injection. The iBAT were labelled automatically by identifying the regions with obvious FF change in response to the NE stimulation...
November 29, 2023: Magma
https://read.qxmd.com/read/38019376/liver-t1-and-t2-mapping-in-a-large-cohort-of-healthy-subjects-normal-ranges-and-correlation-with-age-and-sex
#23
JOURNAL ARTICLE
Antonella Meloni, Aldo Carnevale, Paolo Gaio, Vincenzo Positano, Cristina Passantino, Alessia Pepe, Andrea Barison, Giancarlo Todiere, Chrysanthos Grigoratos, Giovanni Novani, Laura Pistoia, Melchiore Giganti, Filippo Cademartiri, Alberto Cossu
OBJECTIVE: We established normal ranges for native T1 and T2 values in the human liver using a 1.5 T whole-body imager (General Electric) and we evaluated their variation across hepatic segments and their association with age and sex. MATERIALS AND METHODS: One-hundred healthy volunteers aged 20-70 years (50% females) underwent MRI. Modified Look-Locker inversion recovery and multi-echo fast-spin-echo sequences were used to measure hepatic native global and segmental T1 and T2 values, respectively...
November 29, 2023: Magma
https://read.qxmd.com/read/37989922/improvement-of-image-quality-in-diffusion-weighted-imaging-with-model-based-deep-learning-reconstruction-for-evaluations-of-the-head-and-neck
#24
JOURNAL ARTICLE
Noriyuki Fujima, Junichi Nakagawa, Hiroyuki Kameda, Yohei Ikebe, Taisuke Harada, Yukie Shimizu, Nayuta Tsushima, Satoshi Kano, Akihiro Homma, Jihun Kwon, Masami Yoneyama, Kohsuke Kudo
OBJECTIVES: To investigate the utility of deep learning (DL)-based image reconstruction using a model-based approach in head and neck diffusion-weighted imaging (DWI). MATERIALS AND METHODS: We retrospectively analyzed the cases of 41 patients who underwent head/neck DWI. The DWI in 25 patients demonstrated an untreated lesion. We performed qualitative and quantitative assessments in the DWI analyses with both deep learning (DL)- and conventional parallel imaging (PI)-based reconstructions...
November 21, 2023: Magma
https://read.qxmd.com/read/37989921/learning-to-deep-learning-statistics-and-a-paradigm-test-in-selecting-a-unet-architecture-to-enhance-mri
#25
JOURNAL ARTICLE
Rishabh Sharma, Panagiotis Tsiamyrtzis, Andrew G Webb, Ernst L Leiss, Nikolaos V Tsekos
OBJECTIVE: This study aims to assess the statistical significance of training parameters in 240 dense UNets (DUNets) used for enhancing low Signal-to-Noise Ratio (SNR) and undersampled MRI in various acquisition protocols. The objective is to determine the validity of differences between different DUNet configurations and their impact on image quality metrics. MATERIALS AND METHODS: To achieve this, we trained all DUNets using the same learning rate and number of epochs, with variations in 5 acquisition protocols, 24 loss function weightings, and 2 ground truths...
November 21, 2023: Magma
https://read.qxmd.com/read/37978992/compressed-svd-based-l%C3%A2-%C3%A2-s-model-to-reconstruct-undersampled-dynamic-mri-data-using-parallel-architecture
#26
JOURNAL ARTICLE
Muhammad Shafique, Sohaib Ayaz Qazi, Hammad Omer
BACKGROUND: Magnetic Resonance Imaging (MRI) is a highly demanded medical imaging system due to high resolution, large volumetric coverage, and ability to capture the dynamic and functional information of body organs e.g. cardiac MRI is employed to assess cardiac structure and evaluate blood flow dynamics through the cardiac valves. Long scan time is the main drawback of MRI, which makes it difficult for the patients to remain still during the scanning process. OBJECTIVE: By collecting fewer measurements, MRI scan time can be shortened, but this undersampling causes aliasing artifacts in the reconstructed images...
November 18, 2023: Magma
https://read.qxmd.com/read/37971557/physiological-confounders-of-renal-blood-flow-measurement
#27
REVIEW
Bashair Alhummiany, Kanishka Sharma, David L Buckley, Kywe Kywe Soe, Steven P Sourbron
OBJECTIVES: Renal blood flow (RBF) is controlled by a number of physiological factors that can contribute to the variability of its measurement. The purpose of this review is to assess the changes in RBF in response to a wide range of physiological confounders and derive practical recommendations on patient preparation and interpretation of RBF measurements with MRI. METHODS: A comprehensive search was conducted to include articles reporting on physiological variations of renal perfusion, blood and/or plasma flow in healthy humans...
November 16, 2023: Magma
https://read.qxmd.com/read/37950797/quantitative-imaging-through-the-production-chain-from-idea-to-application
#28
LETTER
Najat Salameh, Sebastian Weingärtner, Tom Hilbert, Valérie Vilgrain, Matthew D Robson, José P Marques
No abstract text is available yet for this article.
November 11, 2023: Magma
https://read.qxmd.com/read/37934295/cranial-bone-imaging-using-ultrashort-echo-time-bone-selective-mri-as-an-alternative-to-gradient-echo-based-black-bone-techniques
#29
JOURNAL ARTICLE
Nada Kamona, Brandon C Jones, Hyunyeol Lee, Hee Kwon Song, Chamith S Rajapakse, Connor S Wagner, Scott P Bartlett, Felix W Wehrli
OBJECTIVES: CT is the clinical standard for surgical planning of craniofacial abnormalities in pediatric patients. This study evaluated three MRI cranial bone imaging techniques for their strengths and limitations as a radiation-free alternative to CT. METHODS: Ten healthy adults were scanned at 3 T with three MRI sequences: dual-radiofrequency and dual-echo ultrashort echo time sequence (DURANDE), zero echo time (ZTE), and gradient-echo (GRE). DURANDE bright-bone images were generated by exploiting bone signal intensity dependence on RF pulse duration and echo time, while ZTE bright-bone images were obtained via logarithmic inversion...
November 7, 2023: Magma
https://read.qxmd.com/read/37902898/new-clinical-opportunities-of-low-field-mri-heart-lung-body-and-musculoskeletal
#30
REVIEW
Ye Tian, Krishna S Nayak
Contemporary whole-body low-field MRI scanners (< 1 T) present new and exciting opportunities for improved body imaging. The fundamental reason is that the reduced off-resonance and reduced SAR provide substantially increased flexibility in the design of MRI pulse sequences. Promising body applications include lung parenchyma imaging, imaging adjacent to metallic implants, cardiac imaging, and dynamic imaging in general. The lower cost of such systems may make MRI favorable for screening high-risk populations and population health research, and the more open configurations allowed may prove favorable for obese subjects and for pregnant women...
October 30, 2023: Magma
https://read.qxmd.com/read/37861938/synthesis-and-evaluation-of-new-magneto-fluorescent-carbon-dot-based-on-manganese-citrate-for-mri-imaging
#31
JOURNAL ARTICLE
Vahid Ali, Hassan Kefayati, Mehdi Shafiee Ardestani, Afshin Pourahmad
OBJECTIVE: Medical imaging techniques have widely revolutionized the diagnosis and treatment of various health conditions. Among these techniques, magnetic resonance imaging (MRI) has stood out as a noninvasive and versatile tool. Now, a breakthrough innovation called "manganese-carbon dots" is poised to enhance MRI imaging and provide physicians with even greater insight into the human body. MATERIALS AND METHODS: In this study, one-pot hydrothermal method was used to fabricate magneto-fluorescent carbon quantum dots using manganese citrate, urea, and Mn2+...
October 20, 2023: Magma
https://read.qxmd.com/read/37815638/a-reproducibility-study-of-knee-cartilage-volume-and-thickness-values-derived-by-fully-automatic-segmentation-based-on-three-dimensional-dual-echo-in-steady-state-data-from-1-5%C3%A2-t-and-3%C3%A2-t-magnetic-resonance-imaging
#32
JOURNAL ARTICLE
Ranxu Zhang, Xiaoyue Zhou, Esther Raithel, Congcong Ren, Ping Zhang, Junfei Li, Lin Bai, Jian Zhao
OBJECTIVE: To evaluate the repeatability of cartilage volume and thickness values at 1.5 T MRI using a fully automatic cartilage segmentation method and reproducibility of the method between 1.5 T and 3 T data. METHODS: The study included 20 knee joints from 10 healthy subjects with each subject having undergone double-knee MRI. All knees were scanned at 1.5 T and 3 T MR scanners using a three-dimensional (3D) high-resolution dual-echo in steady state (DESS) sequence...
October 10, 2023: Magma
https://read.qxmd.com/read/37768433/subject-specific-timing-adaption-in-time-encoded-arterial-spin-labeling-imaging
#33
JOURNAL ARTICLE
Nora-Josefin Breutigam, Daniel Christopher Hoinkiss, Simon Konstandin, Mareike Alicja Buck, Amnah Mahroo, Klaus Eickel, Federico von Samson-Himmelstjerna, Matthias Günther
OBJECTIVES: One challenge in arterial spin labeling (ASL) is the high variability of arterial transit times (ATT), which causes associated arterial transit delay (ATD) artifacts. In patients with pathological changes, these artifacts occur when post-labeling delay (PLD) and bolus durations are not optimally matched to the subject, resulting in difficult quantification of cerebral blood flow (CBF) and ATT. This is also true for the free lunch approach in Hadamard-encoded pseudocontinuous ASL (H-pCASL)...
September 28, 2023: Magma
https://read.qxmd.com/read/37737942/first-implementation-of-dynamic-oxygen-17-17-o-magnetic-resonance-imaging-at-7-tesla-during-neuronal-stimulation-in-the-human-brain
#34
JOURNAL ARTICLE
Louise Ebersberger, Fabian J Kratzer, Vanessa L Franke, Armin M Nagel, Sebastian C Niesporek, Andreas Korzowski, Mark E Ladd, Heinz-Peter Schlemmer, Daniel Paech, Tanja Platt
OBJECTIVE: First implementation of dynamic oxygen-17 (17 O) MRI at 7 Tesla (T) during neuronal stimulation in the human brain. METHODS: Five healthy volunteers underwent a three-phase 17 O gas (17 O2 ) inhalation experiment. Combined right-side visual stimulus and right-hand finger tapping were used to achieve neuronal stimulation in the left cerebral hemisphere. Data analysis included the evaluation of the relative partial volume (PV)-corrected time evolution of absolute 17 O water (H2 17 O) concentration and of the relative signal evolution without PV correction...
September 22, 2023: Magma
https://read.qxmd.com/read/37715877/dynamics-of-%C3%AE-aminobutyric-acid-concentration-in-the-human-brain-in-response-to-short-visual-stimulation
#35
JOURNAL ARTICLE
Alexey Yakovlev, Alexandra Gritskova, Andrei Manzhurtsev, Maxim Ublinskiy, Petr Menshchikov, Anatoly Vanin, Dmitriy Kupriyanov, Tolib Akhadov, Natalia Semenova
OBJECTIVE: To find a possible quantitative relation between activation-induced fast (< 10 s) changes in the γ-aminobutyric acid (GABA) level and the amplitude of a blood oxygen level-dependent contrast (BOLD) response (according to magnetic resonance spectroscopy [MRS] and functional magnetic resonance imaging [fMRI]). MATERIALS AND METHODS: fMRI data and MEGA-PRESS magnetic resonance spectra [echo time (TE)/repetition time (TR) = 68 ms/1500 ms] of an activated area in the visual cortex of 33 subjects were acquired using a 3 T MR scanner...
September 16, 2023: Magma
https://read.qxmd.com/read/37713007/comparison-of-convolutional-neural-networks-based-method-and-lcmodel-on-the-quantification-of-in-vivo-magnetic-resonance-spectroscopy
#36
JOURNAL ARTICLE
Yu-Long Huang, Yi-Ru Lin, Shang-Yueh Tsai
BACKGROUND: Quantification of metabolites concentrations in institutional unit (IU) is important for inter-subject and long-term comparisons in the applications of magnetic resonance spectroscopy (MRS). Recently, deep learning (DL) algorithms have found a variety of applications on the process of MRS data. A quantification strategy compatible to DL base MRS spectral processing method is, therefore, useful. MATERIALS AND METHODS: This study aims to investigate whether metabolite concentrations quantified using a convolutional neural network (CNN) based method, coupled with a scaling procedure that normalizes spectral signals for CNN input and linear regression, can effectively reflect variations in metabolite concentrations in IU across different brain regions with varying signal-to-noise ratios (SNR) and linewidths (LW)...
September 15, 2023: Magma
https://read.qxmd.com/read/37702845/the-role-of-gadolinium-based-contrast-agents-in-magnetic-resonance-imaging-structured-reporting-and-data-systems-rads
#37
REVIEW
Marco Parillo, Carlo Augusto Mallio, Aart J Van der Molen, Àlex Rovira, Ilona A Dekkers, Uwe Karst, Gerard Stroomberg, Olivier Clement, Eliana Gianolio, Aart J Nederveen, Alexander Radbruch, Carlo Cosimo Quattrocchi
Among the 28 reporting and data systems (RADS) available in the literature, we identified 15 RADS that can be used in Magnetic Resonance Imaging (MRI). Performing examinations without using gadolinium-based contrast agents (GBCA) has benefits, but GBCA administration is often required to achieve an early and accurate diagnosis. The aim of the present review is to summarize the current role of GBCA in MRI RADS. This overview suggests that GBCA are today required in most of the current RADS and are expected to be used in most MRIs performed in patients with cancer...
September 13, 2023: Magma
https://read.qxmd.com/read/37665502/dynamic-cardiac-mri-with-high-spatiotemporal-resolution-using-accelerated-spiral-out-and-spiral-in-out-bssfp-pulse-sequences-at-1-5%C3%A2-t
#38
JOURNAL ARTICLE
Zhixing Wang, Xue Feng, Michael Salerno, Christopher M Kramer, Craig H Meyer
OBJECTIVE: To develop two spiral-based bSSFP pulse sequences combined with L + S reconstruction for accelerated ungated, free-breathing dynamic cardiac imaging at 1.5 T. MATERIALS AND METHODS: Tiny golden angle rotated spiral-out and spiral-in/out bSSFP sequences combined with view-sharing (VS), compressed sensing (CS), and low-rank plus sparse (L + S) reconstruction were evaluated and compared via simulation and in vivo dynamic cardiac imaging studies...
September 4, 2023: Magma
https://read.qxmd.com/read/37741956/book-of-abstracts-esmrmb-2023-online-39th-annual-scientific-meeting-4-7-october-2023
#39
(no author information available yet)
No abstract text is available yet for this article.
September 2023: Magma
https://read.qxmd.com/read/37632642/will-standardization-kill-innovation
#40
LETTER
Jannie P Wijnen, Nicole Seiberlich, Xavier Golay
No abstract text is available yet for this article.
August 26, 2023: Magma
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