Article
Engineering, Biomedical
Myung-Ho In, Daehun Kang, Hang Joon Jo, Uten Yarach, Nolan K. Meyer, Joshua D. Trzasko, John Huston III, Matt A. Bernstein, Yunhong Shu
Summary: This study improved the RG-fMRI technique by optimizing imaging protocols and applying reverse Fourier acquisition. Multi-band imaging was used to enhance temporal and spatial resolution, and a simple theoretical relationship between echo shift and geometric distortion was derived and validated. Furthermore, reverse Fourier acquisition was shown to improve the temporal or spatial resolution of RG-fMRI without significant signal degradation or spatial resolution loss.
PHYSICS IN MEDICINE AND BIOLOGY
(2023)
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
Radiology, Nuclear Medicine & Medical Imaging
Shanshan Shan, Mao Li, Mingyan Li, Fangfang Tang, Stuart Crozier, Feng Liu
Summary: The proposed deep convolutional neural network-based method, ReUINet, efficiently recovers undistorted images for real-time image guidance in MRI-Linac systems. It shows promise in providing accurate MR images for real-time MRI-guided radiotherapy, with better correction results than standard interpolation methods.
Article
Radiology, Nuclear Medicine & Medical Imaging
Hyunsung Eun, Hwihun Jeong, Jingu Lee, Hyeong-Geol Shin, Jongho Lee
Summary: The proposed method successfully separates the contributions of susceptibility and chemical shift/exchange in phantoms with isotropic magnetic susceptibility. Both simulations and experiments confirmed the effectiveness of the method in separating the properties of olive oil, bovine serum albumin, ferritin, and iron oxide solutions in terms of susceptibility and chemical shift/exchange.
MAGNETIC RESONANCE IN MEDICINE
(2021)
Article
Environmental Sciences
Wei-Zhe Cui, Zhi-Yong Ji, Kaniki Tumba, Zhong-De Zhang, Jing Wang, Zhao-Xiang Zhang, Jie Liu, Ying-Ying Zhao, Jun-Sheng Yuan
Summary: This study examined the impact of inflow modes on the efficiency of salinity gradient power generation in concentrated seawater disposal. The results showed that co-current mode was more effective than counter-current mode, reducing negative impacts on marine ecological environment. Additionally, temperature difference had an impact on power density, with higher temperatures having a positive effect on power generation.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Radiology, Nuclear Medicine & Medical Imaging
Praitayini Kanakaraj, Leon Y. Cai, Tianyuan Yao, Francois Rheault, Baxter P. Rogers, Adam Anderson, Kurt G. Schilling, Bennett A. Landman
Summary: In diffusion-weighted MRI, hardware nonlinearities cause spatial variations in diffusion weighting. This study proposes a two-step signal approximation method for correcting gradient nonlinearities in DW-MRI. The method scales the diffusion signal and resamples the gradient orientations, resulting in uniform gradients and easy integration into existing diffusion workflows. The technique was validated using a NODDI model and showed no significant differences compared to voxel-wise correction. The two-step signal approximation provides an efficient solution for correcting gradient nonlinearities in DW-MRI.
MAGNETIC RESONANCE IMAGING
(2023)
Article
Radiology, Nuclear Medicine & Medical Imaging
Tetsuya Yamamoto, Masaki Fukunaga, Sho K. Sugawara, Yuki H. Hamano, Norihiro Sadato
Summary: The study aimed to quantify the effectiveness of distortion corrections in 7T fMRI data, revealing that corrections for B-0 and gradient distortions significantly reduced cortical fallout and displacement. These corrections were found to be effective even in regions with moderate distortions.
JOURNAL OF MAGNETIC RESONANCE IMAGING
(2021)
Article
Optics
Junjie Wei, Zihe Hu, Mingming Zhang, Pan Li, You Wu, Cheng Zeng, Ming Tang, Jinsong Xia
Summary: This article demonstrates the achievement of all-optical wavelength conversion and high-speed signal transmission in a thin-film periodically poled lithium niobate waveguide.
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
Radiology, Nuclear Medicine & Medical Imaging
Paul Wang, Taylor Froelich, Efrain Torres, Lance DelaBarre, Parker Jenkins, Jerahmie Radder, Michael Mullen, Michael Garwood
Summary: This article adapted an algorithm to correct image distortion resulting from a nonlinear B+1 gradient field in FREE and effectively reduced distortions in FREE images acquired with nonlinear B+1-gradient fields using straightforward linear interpolation and intensity scaling.
MAGNETIC RESONANCE IN MEDICINE
(2023)
Article
Radiology, Nuclear Medicine & Medical Imaging
Praitayini Kanakaraj, Leon Y. Cai, Francois Rheault, Fang-Cheng Yehe, Baxter P. Rogers, Kurt G. Schilling, Bennett A. Landman
Summary: In diffusion MRI, gradient nonlinearities can distort diffusion gradients, leading to biased diffusion tensor information. This study investigates the impact of gradient nonlinearity correction in the presence of noise. Empirical gradient nonlinear fields were introduced at different signal-to-noise ratio levels in tensor field and brain simulation experiments, and the effects were evaluated using diffusion metrics. The study suggests that gradient nonlinearity correction has more beneficial effects than adverse effects, and it is recommended for areas with pronounced nonlinearities.
MAGNETIC RESONANCE IMAGING
(2023)
Article
Radiology, Nuclear Medicine & Medical Imaging
Yuxi Pang, Dariya Malyarenko, Ghoncheh Amouzandeh, Enzo Barberi, Michael Cole, Axel Vom Endt, Johannes Peeters, Ek T. Tan, Thomas L. Chenevert
Summary: The study empirically verified the gradient nonlinearity characteristics provided by different vendors on 3T MR systems and demonstrated the effectiveness of GNL bias correction for human brain apparent diffusion coefficient (ADC). The results showed that accurate WM ADC was recovered using system-specific tensor-based GNL correction, regardless of spatial locations and clinical MR platforms.
PHYSICA MEDICA-EUROPEAN JOURNAL OF MEDICAL PHYSICS
(2021)
Article
Engineering, Electrical & Electronic
Mengfan Fu, Yiwen Wu, Zhiyuan Yang, Huazhi Lun, Xiaobo Zeng, Lilin Yi, Weisheng Hu, Qunbi Zhuge
Summary: In this paper, a TC-PNC scheme is proposed to compensate for intra-channel fiber nonlinear impairments. Compared to conventional PNC and DPNC, TC-PNC has lower complexity and better compensation performance. Simulations and experiments demonstrate that TC-PNC can effectively improve the signal-to-noise ratio and validate its effectiveness.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Computer Science, Interdisciplinary Applications
Pengliang Yang
Summary: This paper presents an open source software called SMIwiz, which combines seismic modelling, reverse time migration, and full waveform inversion into a unified computer implementation. SMIwiz supports both 2D and 3D simulations and provides various computational recipes for efficient calculation. Its independent processing and batchwise job scheduling ensure scalability, and its viability is demonstrated through applications on benchmark models.
COMPUTER PHYSICS COMMUNICATIONS
(2024)
Review
Biophysics
Melissa W. Haskell, Jon-Fredrik Nielsen, Douglas C. Noll
Summary: This review describes the sources, effects, and strategies to prevent and correct off-resonance artifacts in MRI, as well as the advantages and challenges of low-field imaging.
NMR IN BIOMEDICINE
(2023)
Article
Radiology, Nuclear Medicine & Medical Imaging
Radim Barta, Vyacheslav Volotovskyy, Keith Wachowicz, B. Gino Fallone, Nicola De Zanche
Summary: The study evaluated the impact of emerging conductor technology on RF coils, finding that thin aluminum conductors (especially 9 μm in thickness) significantly reduce SNR, while thin copper conductors (less than 32 μm in thickness) only slightly decrease SNR compared to thick copper conductors.
MAGNETIC RESONANCE IN MEDICINE
(2021)
Article
Orthopedics
Vahid Abdollah, Eric C. Parent, Samin Dolatabadi, Erica Marr, Roger Croutze, Keith Wachowicz, Greg Kawchuk
Summary: Magnetic resonance imaging textural features may have the potential to differentiate between individuals with and without low back pain, providing valuable insights for further investigations into the reasons for LBP.
JOURNAL OF ORTHOPAEDIC RESEARCH
(2021)
Article
Engineering, Biomedical
Vahid Abdollah, Eric C. Parent, Alex Su, Keith Wachowicz, Michele C. Batti
Summary: The study aimed to compare the effects of compression and traction on lumbar discs measurements in relation to degeneration, finding significant changes in measurements under different loading conditions. T-2-weighted centroid locations, angle, and disc height detected the largest loading response.
CLINICAL BIOMECHANICS
(2021)
Article
Oncology
Michael H. Wang, Larissa J. Vos, Don Yee, Samir Patel, Nadeem Pervez, Matthew Parliament, Nawaid Usmani, Brita Danielson, John Amanie, Robert Pearcey, Sunita Ghosh, Colin Field, B. Gino Fallone, Albert D. Murtha
Summary: A randomized controlled study was conducted to evaluate the treatment outcomes of HFRT and CFRT in high-risk prostate cancer patients. The results showed that both treatment methods led to similar tolerance and survival rates.
PRACTICAL RADIATION ONCOLOGY
(2021)
Article
Radiology, Nuclear Medicine & Medical Imaging
Kiaran P. McGee, Neelam Tyagi, John E. Bayouth, Minsong Cao, B. Gino Fallone, Carri K. Glide-Hurst, Frank L. Goerner, Olga L. Green, Taeho Kim, Eric S. Paulson, Nathan E. Yanasak, Edward F. Jackson, James H. Goodwin, Sonja Dieterich, David W. Jordan, Geoffrey D. Hugo, Matt A. Bernstein, James M. Balter, Kalpana M. Kanal, John D. Hazle, Norbert J. Pelc
Summary: The integration of magnetic resonance imaging (MRI) into radiation therapy has grown significantly, with advancements in technology allowing for high-resolution data acquisition and the development of MR-guided radiation therapy (MRgRT). While these advancements provide new treatment options for a broader patient population, challenges include adaptation of hardware and software, standardization of imaging techniques, education, and support for research and development.
Article
Radiology, Nuclear Medicine & Medical Imaging
Mark Wright, Bryson Dietz, Eugene Yip, Jihyun Yun, Zsolt Gabos, B. Gino Fallone, Keith Wachowicz
Summary: A rapid real-time 2D MRI acceleration method using PCA in the temporal domain was developed for real-time tracking applications. The method demonstrated good temporal robustness, with the optimal number of PCs for temporal fitting dependent on the acceleration rate. The method showed improved robustness in image quality metrics over time up to an acceleration of 8x.
Article
Clinical Neurology
Vahid Abdollah, Eric C. Parent, Samin Dolatabadi, Erica Marr, Keith Wachowicz, Michele Battie
Summary: Advances in texture analysis and machine learning provide new opportunities for applying imaging to intervertebral disc biomechanics. This study used these techniques to investigate lumbar disc response to loading, finding significant differences in the nucleus and posterior annulus at the L4-5 level between compression and traction. MRI textural features show potential in identifying how discs respond to loading, with the nucleus and posterior annulus being most sensitive.
EUROPEAN SPINE JOURNAL
(2022)
Article
Medicine, Research & Experimental
Kieran Purich, Haolei Cai, Bin Yang, Zhihao Xu, Anthony G. Tessier, Adnan Black, Ryan W. Hung, Eric Boivin, Baoyou Xu, Ping Wu, Bo Zhang, Dong Xin, Biagio Gino Fallone, Ray Rajotte, Yulian Wu, Gina R. Rayat
Summary: The study found that labeling neonatal porcine islets with PVP-SPIO did not affect their function and allowed for clear visualization on MRI. Changes in MRI signals following rejection suggest a potential use of PVP-SPIO-labeled islets to monitor graft viability.
XENOTRANSPLANTATION
(2022)
Article
Oncology
Michael H. Wang, Wilson Roa, Keith Wachowicz, Atiyah Yahya, Albert Murtha, John Amanie, Jonathan Chainey, Harvey Quon, Sunita Ghosh, Samir Patel
Summary: This study evaluated the impact of magnetic resonance spectroscopic imaging (MRSI) on the survival of patients with high-grade glioma. The results showed that serial changes in certain metabolic metrics measured by MRSI were associated with overall survival (OS) and progression-free survival (PFS). These findings suggest that MRSI could provide an early assessment of treatment response and enable risk-adapted therapy in clinical practice.
ANTICANCER RESEARCH
(2022)
Meeting Abstract
Radiology, Nuclear Medicine & Medical Imaging
Gawon Han, Keith Wachowicz, Nawaid Usmani, Don Yee, Jordan Wong, Gino Fallone, Jihyun Yun
Meeting Abstract
Radiology, Nuclear Medicine & Medical Imaging
Neil Johnson, Keith Wachowicz, Satyapal Rathee, Gino Fallone, Jihyun Yun
Meeting Abstract
Radiology, Nuclear Medicine & Medical Imaging
Michael Reynolds, Patricia A. K. Oliver, Tania Wood, Keith Wachowicz, Ben Burke, B. Gino Fallone
Meeting Abstract
Radiology, Nuclear Medicine & Medical Imaging
Gawon Han, Don Yee, Keith Wachowicz, B. Gino Fallone, Jihyun Yun
Article
Computer Science, Information Systems
Aaron R. Purchase, Logi Vidarsson, Keith Wachowicz, Piotr Liszkowski, Hongwei Sun, Gordon E. Sarty, Jonathan C. Sharp, Boguslaw Tomanek
Summary: Traditional Halbach magnets are widely used in MRI, but improvements in manufacturing techniques and designs are needed to reduce weight. This study successfully reduces the weight and size of Halbach magnets by optimizing the design and using high-coercivity ferromagnets, while maintaining good magnetic field homogeneity.