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- Title
Toward real-time availability of 3D temperature maps created with temporally constrained reconstruction.
- Authors
Todd, Nick; Prakash, Jaya; Odéen, Henrik; Bever, Josh; Payne, Allison; Yalavarthy, Phaneendra; Parker, Dennis L.
- Abstract
Purpose To extend the previously developed temporally constrained reconstruction (TCR) algorithm to allow for real-time availability of three-dimensional (3D) temperature maps capable of monitoring MR-guided high intensity focused ultrasound applications. Methods A real-time TCR (RT-TCR) algorithm is developed that only uses current and previously acquired undersampled k-space data from a 3D segmented EPI pulse sequence, with the image reconstruction done in a graphics processing unit implementation to overcome computation burden. Simulated and experimental data sets of HIFU heating are used to evaluate the performance of the RT-TCR algorithm. Results The simulation studies demonstrate that the RT-TCR algorithm has subsecond reconstruction time and can accurately measure HIFU-induced temperature rises of 20°C in 15 s for 3D volumes of 16 slices (RMSE = 0.1°C), 24 slices (RMSE = 0.2°C), and 32 slices (RMSE = 0.3°C). Experimental results in ex vivo porcine muscle demonstrate that the RT-TCR approach can reconstruct temperature maps with 192 × 162 × 66 mm 3D volume coverage, 1.5 × 1.5 × 3.0 mm resolution, and 1.2-s scan time with an accuracy of ±0.5°C. Conclusion The RT-TCR algorithm offers an approach to obtaining large coverage 3D temperature maps in real-time for monitoring MR-guided high intensity focused ultrasound treatments. Magn Reson Med 71:1394-1404, 2014. © 2013 Wiley Periodicals, Inc.
- Publication
Magnetic Resonance in Medicine, 2014, Vol 71, Issue 4, p1394
- ISSN
0740-3194
- Publication type
Article
- DOI
10.1002/mrm.24783