OBJECTIVE
The objective of this work is to develop an electromagnetic induction coil (EMIC)-based motion tracking system with low footprint and in-place calibration, enabling high-temporal-resolution prospective motion correction (PMC) for short-TR MRI sequences.
METHOD
We designed an MR-visible EMIC that supports in-place calibration and flexible distribution of the coils. To demonstrate the benefits of improved temporal resolution with EMIC, EMIC and fat navigator (FatNav)-based PMC were performed for 2D phase contrast MRI (PC-MRI) under similar motion conditions.
RESULTS
EMIC increased the temporal resolution of motion tracking by 10 times compared to FatNav and demonstrated high sensitivity to small motions, with random errors in the range of 0.06-0.12 mm for translation and 0.075-$0.078^{\circ }$ for rotation. EMIC-based PMC significantly improved image quality for PC-MRI compared with both no PMC and FatNav-based PMC.
CONCLUSION
By providing higher temporal resolution motion tracking than FatNav, EMIC achieved superior PMC performance in 2D PC-MRI and significantly improved image quality.
SIGNIFICANCE
The developed MR-visible EMIC eliminated the need for sensor calibration in advance and improved patient comfort and RF coil compatibility, enabling more effective PMC with improved image quality.
Zhanbin Dong, Tuo Yu, Bingbing Zhao et al.· IEEE transactions on bio-med...· 0 citations
PURPOSE
Reproducibility in MRI is limited by variability in data acquisition, formatting, and reconstruction across sites and vendors. This work aimed to mitigate these challenges through an open-source, vendor-independent workflow originally developed for the 2023-24 ISMRM Repeat It with Me: Reproducibility Team Challenge.
METHODS
Pulseq, extended with advanced features including LABELs and Sequence Definitions for k-space description and execution instructions, was used to harmonize data acquisition. Pulseq-generated raw k-space data were converted into the MRD format using these metadata. Open-source, vendor-independent image reconstruction and post-processing were performed with Gadgetron. Additionally, vendor-native online reconstructions on Siemens platforms (ICE and OpenRecon) were enabled for Pulseq-based sequences. The workflow was validated using MPRAGE and EPI protocols in phantoms and in vivo across nine scanners from five sites and four vendors. Vendor-native acquisition and reconstruction protocols were executed for comparison.
RESULTS
Pulseq-based sequences executed successfully on all systems, with all data converted and reconstructed without errors. Pulseq-based, Gadgetron-reconstructed images showed good agreement with corresponding vendor-native images across scanners; however, qualitative and quantitative differences remained. Despite detailed natural-language descriptions and meticulous console configuration, vendor-native protocols introduced subtle but notable cross-platform differences in sequence execution and reconstruction. In contrast, the proposed workflow achieved highly consistent sequence execution via Pulseq and standardized reconstruction through Gadgetron across scanners.
CONCLUSION
We established an open-source MRI workflow that harmonizes data acquisition, formatting, and reconstruction across sites and vendors. This workflow represents a critical step toward fully open and reproducible MRI, facilitating transparency, standardization, and collaboration across the research community.
Qingping Chen, Thomas H. M. Roos, Amaya Murguia et al.· Magnetic Resonance in Medici...· 0 citations