Article
Radiology, Nuclear Medicine & Medical Imaging
Aurelien J. Trotier, Bixente Dilharreguy, Serge Anandra, Nadege Corbin, William Lefrancois, Valery Ozenne, Sylvain Miraux, Emeline J. Ribot
Summary: This study evaluated the repeatability of the CS-MP2RAGE sequence and the accuracy of T1 measurements. The results showed that the CS-MP2RAGE sequence can rapidly obtain high-contrast morphological images and quantitative T1 maps while maintaining high repeatability.
INVESTIGATIVE RADIOLOGY
(2022)
Article
Radiology, Nuclear Medicine & Medical Imaging
Dinghui Wang, Ryan K. Robison, Zhiqiang Li, James G. Pipe
Summary: This study presents the implementation of 3D spiral high-resolution MPRAGE and demonstrates that SNR and scan efficiency increase with longer readout times. The results show that consistent T-1 weighting can be achieved with various spiral readout lengths, and spiral MPRAGE imaging has higher SNR efficiency compared to Cartesian imaging.
MAGNETIC RESONANCE IN MEDICINE
(2023)
Article
Radiology, Nuclear Medicine & Medical Imaging
Fardad Michael Serry, Sen Ma, Xianglun Mao, Fei Han, Yibin Xie, Hui Han, Debiao Li, Anthony G. Christodoulou
Summary: Developing a method for single-scan B-1(+)-corrected T-1 mapping with improved accuracy and repeatability, the 2FA IR-FLASH approach allows for free-breathing cardiac MR multitasking without the need for BH or ECG triggering. Results demonstrate better performance of 2FA over 1FA in terms of T-1 estimate accuracy and repeatability.
MAGNETIC RESONANCE IN MEDICINE
(2021)
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
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
Radiology, Nuclear Medicine & Medical Imaging
Claudio Puddu, Madhwesha Rao, Xiaojun Xu, Martin H. Deppe, Guilhem Collier, Adam Maunder, Ho-Fung Chan, Nicola De Zanche, Fraser Robb, Jim M. Wild
Summary: This study developed and tested an asymmetrical Xe-129 birdcage RF coil for Xe-129 lung ventilation imaging at 1.5 Tesla, which also allows compatibility with H-1 system body RF coil. Results demonstrated that the asymmetrical birdcage RF coil performed well in MR imaging.
MAGNETIC RESONANCE IN MEDICINE
(2021)
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
Radiology, Nuclear Medicine & Medical Imaging
T. Stanescu, S. H. Mousavi, M. Cole, E. Barberi, K. Wachowicz
Summary: The study examines numerical modelling and experimental validation of magnetic susceptibility effects in a 3D linearity phantom for quantifying MR image distortions. By modeling the susceptibility signature of the device accurately, the procedure enables determination of GNL field and B-0 map without extra acquisitions or phantoms, after removing it as a post-processing correction step.
PHYSICA MEDICA-EUROPEAN JOURNAL OF MEDICAL PHYSICS
(2021)
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
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
Article
Computer Science, Information Systems
Adam Mitchell Maunder, Christopher Barker, Nicola De Zanche, Ashwin K. Iyer
Summary: This work details the design concepts of a metamaterial (MM) liner for MRI RF excitation, which enables the propagation of EM waves at frequencies below the natural cutoff of the MRI bore. The effective anisotropic EM properties of the MM liner are calculated using a combined circuit and effective-medium model, and compared to full-wave eigenmode simulations. The results of the model agree with the simulations, providing a means for designing and tuning the MM liner for MRI RF excitation. Simulation of a full-scale MM lined bore further demonstrates the transmission properties and EM fields for different bore sizes and field strengths.
Article
Computer Science, Information Systems
Adam Mitchell Maunder, Ashwin K. Iyer, Nicola De Zanche
Summary: The companion paper to this work presents the theoretical foundations of a metamaterial (MM) liner for the MRI bore. This Part 2 paper focuses on the practical design and modeling of the MM liner for a body MRI radio-frequency transmitter. A network mesh model is developed to simplify the structure of the MM and demonstrate its effectiveness. The simulated performance of the MM liner is evaluated using key metrics and compared to the commonly used birdcage coil, showing a reduction in SAR with comparable transmit efficiency and homogeneity.
Meeting Abstract
Radiology, Nuclear Medicine & Medical Imaging
Gawon Han, Don Yee, Keith Wachowicz, B. Gino Fallone, Jihyun Yun
Proceedings Paper
Engineering, Electrical & Electronic
Adam Maunder, Nicola De Zanche, Ashwin K. Iyer
Summary: A design method utilizing 2D transmission line analysis and corresponding dispersion is presented for rectangular and cylindrical metamaterial liners, intended for use as receive arrays and transceive resonators.
2021 INTERNATIONAL APPLIED COMPUTATIONAL ELECTROMAGNETICS SOCIETY SYMPOSIUM (ACES)
(2021)
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.