Cape Town - 2026 ISMRM-ISMRT Annual Meeting and Exhibition - System Imperfections and Field Monitoring

System Imperfections and Field Monitoring

Digital Poster

Physics & Engineering

Wednesday, 13 May 2026

Digital Posters Row I

09:15 - 10:10

Session Number: 568-02

No CME/CE Credit

Similar Sessions

The difference between how an MR system actually behaves and how we think it behaves can make all the difference. Understanding how these imperfections arise and how they can be corrected, especially with the help of field monitoring, can accelerate development of new applications.

		568-02-001. GTF-Net: Parametric Identification of Magnetic Resonance Gradient Systems Yang Chen, Hongyu Guo, Wentao Liu, Weinan Tang, Qian Zeng, Hongbin Wang, Yupeng Cao, Siqi Wang Shenyang University of Technology, Shen Yang, China Impact: GTF-Net enables more accurate non-Cartesian gradient correction in real-time MRI, improving image quality and reliability. This advances motion robust imaging applications and allows future investigation of dynamic trajectory control and nonlinear gradient behavior in clinical and research settings.
		568-02-002. Impact of Field Monitoring Device Probe Positioning Errors on Spherical Harmonics Decomposition Accuracy Yihe Hua, Nastaren Abad, Thomas Foo, Desmond Yeo GE HealthCare Technology and Innovation Center, Niskayuna, United States of America Impact: Field monitoring devices assuming perfect gradient linearity blinds itself from actual nonlinearities in real gradient coils and results in spherical harmonic decomposition error, which could be recovered by correction with gradient coil field map.
		568-02-003. Gradient-safe GIRF estimation (gsGIRF) by chirp design based on the acoustic response function Onur Erbil, Rüdiger Brühl, Sebastian Schmitter, Hannes Dillinger Physikalisch-Technische Bundesanstalt (PTB), Braunschweig and Berlin, Berlin, Germany Impact: This work enables open-source, gradient-safe GIRF estimates by avoiding mechanical resonance frequencies throughout the measurement. This may render the ongoing efforts for MR image quality improvements based on trajectory correction safer and more accessible.
		568-02-004. Evaluation of gradient amplitude-response linearity up to 200 mT/m Simon Thalén, Michael Loecher, Daniel Ennis Stanford University, Stanford, United States of America Impact: This work demonstrates that MRI gradient responses remain linear with respect to gradient amplitudes up to 200 mT/m on a whole-body MRI scanner. The finding supports the GIRF linearity assumption for correcting and predicting gradient behavior in advanced imaging sequences.
		568-02-005. Characterization of the stability and imaging performance of a low-cost ultrasonic gradient driver Aniek Wigman, Thomas Roos, Daniel Abraham, Hong En Chew, Edwin Versteeg Eindhoven University of Technology, Eindhoven, Netherlands Impact: This work shows that a low-cost gradient driver can provide stable and high gradient performance to drive an ultrasonic gradient. This addresses one of the key needs for developing for enabling fast and quiet neuro imaging using ultrasonic gradients.
		568-02-006. Characterization of Field Monitoring Performance for High-Resolution Imaging on a High-Performance Gradient System Paul Dubovan, Xingwang Yong, Cameron Cushing, Gabriel Ramos Llordén, Berkin Bilgic, Susie Huang Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital and Harvard Medical School, Charlestown, United States of America Impact: This work provides the first systematic evaluation of high-resolution field monitoring across multiple commercial field monitoring systems and multi-shot trajectories, offering new insight into the achievable limits and practical feasibility of mesoscopic in vivo imaging enabled by field monitoring.
		568-02-007. Enhanced Trajectory Prediction in Spiral MRI Using a Spiral-Optimized GIRF (Spi-GIRF) Zheng Zhong, Qiang Pan, Kai Wang, Guangyu Dan, Qi Liu, Jian Xu, Yichen Hu United Imaging Healthcare North America, Houston, United States of America Impact: The findings suggest Spi-GIRF's potential for improving image quality in spiral-based MRI applications, with implications for trajectory-specific GIRF optimization in advanced MRI.
		568-02-008. Hybrid Active and Passive Brain-Specific Shimming for Ultra-High-Field (5T) MRI Ziyu Liu, Jason Stockmann, Yu Cheng, Yihan Yang, Zhihua Ren ShanghaiTech University, Shanghai, China Impact: The proposed hybrid approach effectively mitigates susceptibility-induced field distortions, allowing stable imaging of regions that are problematic at ultra-high-field strengths and improving both the precision and reproducibility of high-resolution neuroimaging for advanced neuroscientific and clinical applications.
		568-02-009. Reduction of gradient wrap-around (cusp) artifacts in an insert gradient system by passive shim modification SEUNG-KYUN LEE, Afis Ajala, Thomas Foo GE HealthCare Technology and Innovation Center, Niskayuna, United States of America Impact: The proposed method can effectively reduce gradient wrap-around (cusp) artifacts and improve image quality in high-performance anatomy-specific gradient coils without affecting patient workflow, RF safety, or sequence programming.
		568-02-010. Concomitant field characterization by field probes in an H-shaped portable low-field system Suen Chen, Philip Lee, Changyue Wang, Haifeng Lai, Shiwei Yang, Zhen Ji, Zhiyong Zhang Shanghai Jiao Tong University, Shanghai, China Impact: Concomitant fields in a two-plate permanent system with portable design can be reliably characterized by field probes, which provide an effective tool for investigating low-field system properties and better inform system design under unknown field imperfections such as residual fields.
		568-02-011. 3D Polynomial Phase Fitting improves joint reconstruction of odd and even echoes in Simultaneous Multi-Slice EPI Rajagopalan Sundaresan, Tim Sprenger, Baolian Yang, Nastaren Abad, Suchandrima Banerjee, Ramesh Venkatesan, Thomas Foo GE HealthCare, Bengaluru, India Impact: This work enables robust correction of odd-even phase errors in simultaneous multi-slice EPI. The method unlocks higher SMS and in-plane acceleration factors on next-generation gradient systems, facilitating high-quality clinical EPI acquisitions and enabling previously unattainable neuroimaging applications and biomarker discoveries.
		568-02-012. A simulation framework for eddy-current reduction in portable low-field MRI Lorena Vega Cid, Jose Borreguero, Elisa Castañón, Marina Fernández-García, Teresa Guallart Naval, Pablo Benlloch, Rubén Bosch, Luiz Guilherme Santos, Jesús Conejero, Eduardo Pallás, Laia Porcar, José Algarín, Fernando Galve, Joseba Alonso Institute for Molecular Imaging and Instrumentation (i3M), Consejo Superior de Investigaciones Científicas & Universitat Politècnica de València, Valencia, Spain Impact: Low-field MRI suffers from low SNR, requiring metals for effective RF shielding. However, these induce eddy currents that prolong scan times, limiting clinical use. Our validated simulation tool enables redesigning metallic components to minimize eddy-induced fields.
		568-02-013. Influence of Higher-Order Shim Coil Impurity on achievable Magnetic Field Homogeneity in High field Imaging and Spectroscopic Mahrshi Jani, Shengyue Su, Armin NAGEL, Anke Henning University of Texas Southwestern Medical Center, Dallas, United States of America Impact: This work provides useful information about real shim fields higher order shim coils (third order shim coils) can produce. Also, this work emphasizes the need for pure higher order shim hardware for better B₀ shimming.
		568-02-014. Phosphor bronze mesh reduces acoustic noise and preserves transmit efficiency in transmit arrays at 7T and 11.7T Mark McJury, Sarah Allwood-Spiers, Paul-François Gapais, Nicolas Boulant, Shajan Gunamony NHS Greater Glasgow and Clyde, Glasgow, United Kingdom Impact: RF shielding is often used in ultra-high field transmit arrays to minimise radiation loss. We report significant reduction in acoustic noise when using PBM compared to the reference double sided slotted RF shield at both 7T and 11.7T.
		568-02-015. Whole-brain 3D EPI with dynamic field monitoring at 10.5 T: initial experience Shuxian Qu, Jinyuan Zhang, Zihao Zhang, Cameron Cushing, Xin Shao, Naoharu Kobayashi, Kamil Ugurbil, Xiaoping Wu Center for Magnetic Resonance Research (CMRR), University of Minnesota, Minneapolis, United States of America Impact: This work demonstrates the feasibility of quality whole-brain 3D EPI with static and high-order dynamic field correction at 10.5 T, enabling more accurate and stable high-resolution fMRI and advancing the technical foundation for ultra-high field human neuroimaging.