Article
Radiology, Nuclear Medicine & Medical Imaging
C. Kroll, O. Dietrich, J. Bortfeldt, F. Kamp, S. Neppl, C. Belka, K. Parodi, G. Baroni, C. Paganelli, M. Riboldi
Summary: This study quantified and modeled spatial distortions in MRI, providing insights into the effects of different distortion sources and correction modes. Results showed residual distortions after correction, with gradient nonlinearities causing main distortions in the axial plane. Integration in a 4D computational phantom demonstrated severe deformations in specific regions, highlighting the importance of patient-specific measurements for increased simulation realism.
Article
Neurosciences
Wenbin Si, Yihao Guo, Qianqian Zhang, Jinwei Zhang, Yi Wang, Yanqiu Feng
Summary: Quantitative susceptibility mapping (QSM) is capable of quantifying the distribution of magnetic susceptibility in brain diseases. Deep learning methods have shown potential to improve the accuracy of QSM reconstruction. However, most methods neglect the intrinsic nature of the dipole kernel.
FRONTIERS IN NEUROSCIENCE
(2023)
Article
Computer Science, Information Systems
Zhiyang Lu, Jun Li, Chaoyue Wang, Rongjun Ge, Lili Chen, Hongjian He, Jun Shi
Summary: This article proposes a deep learning based SWI-to-QSM-Net (S2Q-Net) model for QSM reconstruction from SWI high-pass filtered phase data. The experimental results demonstrate its superiority over other deep learning based QSM reconstruction methods in both simulated and in-vivo data.
IEEE JOURNAL OF BIOMEDICAL AND HEALTH INFORMATICS
(2022)
Article
Radiology, Nuclear Medicine & Medical Imaging
Seiji Kumazawa, Takashi Yoshiura
Summary: This study proposes a new method for estimating undistorted echo-planar imaging (EPI) images using anatomical T-1-weighted images (T(1)WIs) and compares it with a nonrigid registration-based distortion correction method. The results show that the proposed method has advantages in estimating distortion regions and magnetic field inhomogeneity maps.
Article
Physics, Applied
M. de Wit, L. Gottardi, M. L. Ridder, K. Nagayoshi, E. Taralli, H. Akamatsu, D. Vaccaro, J. -w. a. den Herder, M. P. Bruijn, J. R. Gao
Summary: This study presents an alternative shielding method for TES microcalorimeters and bolometers based on a superconducting groundplane. The results demonstrate that this local shielding effectively reduces the impact of external and internally generated magnetic fields, maintaining high performance of the detectors.
PHYSICAL REVIEW APPLIED
(2022)
Article
Computer Science, Interdisciplinary Applications
Bahareh Alizadeh Kharazi, Amir H. Behzadan
Summary: This study presents a deep neural network approach to detect submerged stop signs in photos taken from flooded roads, coupled with edge detection and transform algorithms to estimate floodwater depth. The method demonstrates the potential to provide a simple, reliable, and scalable solution for estimating floodwater depth in flood-prone regions.
COMPUTERS ENVIRONMENT AND URBAN SYSTEMS
(2021)
Article
Multidisciplinary Sciences
Yang Liu, Mingchuan Huang, Qiankun Chen, Douguo Zhang
Summary: This study proposes a method of analog spatial differentiation using a dielectric multilayer chip, which can achieve both first- and second-order differentiation and realize third- and fourth-order differentiation that has never been achieved before. By incorporating the chip into conventional imaging systems, it enhances the edges of features in optical images, thus expanding the functionality of microscopes.
NATURE COMMUNICATIONS
(2022)
Article
Mechanics
Pengfei Xie, Tianhu He
Summary: Compared to the fractional order generalized thermoelastic theory, the generalized thermoelastic theory based on the memory-dependent derivative has more specific physical meanings and can better describe the correlation between the past and present states of a system.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2023)
Article
Chemistry, Physical
Andrei Filippov, Rustam Gimatdinov, Oleg N. Antzutkin, Natalia A. Kuzina, Oleg Gnezdilov
Summary: The diffusion coefficient in layers of EAN confined between glass plates placed in a strong magnetic field is affected by the rotational conditions and duration of exposure to the magnetic field. While rotation along the magnetic field axis leads to a decrease in diffusion coefficient over time, rotation perpendicular to the magnetic field axis shows no effect on the diffusion coefficient until the rotation stops. Extended exposure to a static magnetic field can cause an increase in diffusivity when the sample starts to rotate around the axis perpendicular to the magnetic field.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Engineering, Electrical & Electronic
Yu Lei, Guirong Weng
Summary: A robust hybrid active contour method based on bias correction is proposed to address the deficiencies of existing active contour models. By incorporating adaptive edge indicator function and level set formulation driven by bias field correction, the method achieves more precise, stable, and efficient segmentation results on challenging images.
SIGNAL PROCESSING-IMAGE COMMUNICATION
(2021)
Article
Geochemistry & Geophysics
Mehwish Iqbal, Muhammad Mohsin Riaz, Syed Sohaib Ali, Abdul Ghafoor, Attiq Ahmad
Summary: This letter presents a method of underwater image enhancement using Laplace decomposition. The method decomposes the image into low-frequency and high-frequency bands, and processes them separately to achieve image enhancement.
IEEE GEOSCIENCE AND REMOTE SENSING LETTERS
(2022)
Article
Neurosciences
Ronja C. Berg, Christine Preibisch, David L. Thomas, Karin Shmueli, Emma Biondetti
Summary: In this study, the effect of different acquisition sequences, flow compensation schemes, and QSM reconstruction methods on venous susceptibilities was investigated. The QSM reconstruction method was found to have a greater influence on susceptibility values compared to the acquisition sequence, with multi-echo gradient-echo acquisition sequences without full flow compensation yielding comparable results to sequences with full flow compensation.
Article
Thermodynamics
Shajar Abbas, Mushtaq Ahmad, Mudassar Nazar, Muhammad Amjad, Haider Ali, Ahmed Zubair Jan
Summary: The focus of this study is to develop a flow model for Brinkman flow through a channel of parallel vertical plates by utilizing the advanced definition of the Prabhakar operator. The governing equations for this flow model are calculated by coupling the generalized constitutive relations for heat and mass fluxes. The results of the parametric analysis, which include the effects of various variables on concentration, temperature, and velocity, are presented graphically.
APPLIED THERMAL ENGINEERING
(2023)
Article
Neurosciences
Maruf Ahmed, Jingjia Chen, Arvin Arani, Matthew L. Senjem, Petrice M. Cogswell, Clifford R. Jack, Chunlei Liu
Summary: A compartmentalized susceptibility MRI imaging technique has the potential to track pathological neurodegeneration in Alzheimer's Disease. This technique provides comprehensive information about the disease mechanism and can be used to track pathological changes in different tissue types and regions of the brain.
Article
Instruments & Instrumentation
Shishir Dasika, Madhur Parashar, Kasturi Saha
Summary: We propose a technique to measure the micro-scale AC susceptibility of magnetic materials using nitrogen-vacancy (NV-) centers in diamond. A quantum diamond microscope with an integrated lock-in camera is used for high-speed magnetic field imaging through lock-in detection of NV- photo-luminescence. Our experimental technique, demonstrated by measuring the AC susceptibility of soft permalloy micro-magnets, opens up possibilities for microscopic measurements of AC susceptibilities in various scientific fields. Published under an exclusive license by AIP Publishing.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2023)
Article
Radiology, Nuclear Medicine & Medical Imaging
Slimane Tounekti, Mahdi Alizadeh, Devon Middleton, James S. Harrop, Bassem Hiba, Laura Krisa, Choukri Mekkaoui, Feroze B. Mohamed
Summary: This study proposes and demonstrates a new method combining reduced field-of-view strategy with phase segmented EPI to address geometric distortion in post-operative DTI scans of patients with metal implants. The results show that the new method outperforms traditional techniques in reducing distortion.
MAGNETIC RESONANCE IMAGING
(2024)
Article
Radiology, Nuclear Medicine & Medical Imaging
Silvia Minosse, Eliseo Picchi, Valentina Ferrazzoli, Noemi Pucci, Valerio Da Ros, Raffaella Giocondo, Roberto Floris, Francesco Garaci, Francesca Di Giuliano
Summary: The aim of this study was to investigate the variation of DCE-MRI-derived kinetic parameters in brain tumors as a function of acquisition time. The results showed that K-ep and V-e were time-dependent and required longer scan times to obtain reliable parameter values, while K-trans was time-independent and remained the same in all acquisition times, making it a reliable parameter for short acquisition times.
MAGNETIC RESONANCE IMAGING
(2024)
Article
Radiology, Nuclear Medicine & Medical Imaging
Xingmin Guan, Xinheng Zhang, Hsin-Jung Yang, Rohan Dharmakumar
Summary: This study aims to investigate why DIR-prepared dark-blood T2* weighted images have lower SNR, CNR, and diagnostic accuracy for intramyocardial hemorrhage (IMH) detection compared to non-DIR-prepared bright-blood T2* images. Through phantom and animal studies, it was confirmed that the signal loss on DIR-prepared T2* images mainly originates from spin-relaxation during the DIR preparation. Therefore, when used for IMH detection, extra attention should be paid to the SNR of DIR-prepared dark-blood T2* imaging protocols.
MAGNETIC RESONANCE IMAGING
(2024)
Article
Radiology, Nuclear Medicine & Medical Imaging
Beatriz Laureano, Hassna Irzan, Helen OReilly, Sebastian Ourselin, Neil Marlow, Andrew Melbourne
Summary: Prematurity and preterm stressors have significant effects on the development of infants, especially at earlier gestations. While neonatal care advances have reduced preterm mortality rates, disability rates continue to grow in middle-income settings. Imaging the preterm brain using MR technology has improved our understanding of its development and the affected regions and networks. This research aims to support interventions, improve neurodevelopment, and provide accurate prognoses for preterm infants. This study focuses on the fully developed brain of extremely preterm subjects and examines myelin-related biomarkers to assess long-term effects. The findings suggest altered connectivity and cognitive outcomes in the adult preterm brain.
MAGNETIC RESONANCE IMAGING
(2024)
Article
Radiology, Nuclear Medicine & Medical Imaging
Julian Rauch, Frederik B. Laun, Peter Bachert, Mark E. Ladd, Tristan A. Kuder
Summary: This study presents a method for reducing concomitant field effects in double diffusion encoding (DDE) sequences by adding oscillating gradient pulses. The modified sequences successfully reduced accumulated concomitant phase without significant changes in the original sequence characteristics. The proposed method led to an increase in signal-to-noise ratio (SNR) for phantom and in vivo experiments, supported by simulations.
MAGNETIC RESONANCE IMAGING
(2024)
Article
Radiology, Nuclear Medicine & Medical Imaging
Marlon Bran Lorenzana, Shekhar S. Chandra, Feng Liu
Summary: Sparse reconstruction is important in MRI for reducing acquisition time and improving spatial-temporal resolution. This paper introduces two decoupling techniques for explicit 1D regularization and a combined 1D + 2D reconstruction technique that improves image quality.
MAGNETIC RESONANCE IMAGING
(2024)
Article
Radiology, Nuclear Medicine & Medical Imaging
Yifan Gou, W. Christopher Golden, Zixuan Lin, Jennifer Shepard, Aylin Tekes, Zhiyi Hu, Xin Li, Kumiko Oishi, Marilyn Albert, Hanzhang Lu, Peiying Liu, Dengrong Jiang
Summary: ARTS algorithm improves the reliability of Y-v estimation in noncompliant subjects, enhancing the utility of Y-v as a biomarker for brain diseases.
MAGNETIC RESONANCE IMAGING
(2024)