Jianing Pang1,2, Behzad Sharif2, Reza Arsanjani2, Xiaoming Bi3, Zhaoyang Fan2, Qi Yang4, Kuncheng Li4, Daniel S Berman2, Debiao Li2,5. 1. Department of Radiology and Biomedical Engineering, Northwestern University, Chicago, Illinois, USA. 2. Biomedical Imaging Research Institute, Cedars-Sinai Medical Center, Los Angeles, California, USA. 3. MR R&D, Siemens Healthcare, Los Angeles, California, USA. 4. Xuanwu Hospital, Capital Medical University, Beijing, China. 5. University of California, Los Angeles, California, USA.
Abstract
PURPOSE: To achieve whole-heart coronary magnetic resonance angiography (MRA) with (1.0 mm)(3) spatial resolution and 5 min of free-breathing scan time. METHODS: We used an electrocardiograph-gated, T2-prepared and fat-saturated balanced steady state free precession sequence with 3DPR trajectory for free-breathing data acquisition with 100% gating efficiency. For image reconstruction, we used a self-calibrating iterative SENSE scheme with integrated retrospective motion correction. We performed healthy volunteer study to compare the proposed method with motion-corrected gridding at different retrospective undersampling levels on apparent signal-to-noise ratio (aSNR) and subjective coronary artery (CA) visualization scores. RESULTS: Compared with gridding, the proposed method significantly improved both image quality metrics for undersampled datasets with 6000, 8000, and 10,000 projections. With as few as 10,000 projections, the proposed method yielded good CA visualization scores (3.02 of 4) and aSNR values comparable to those with 20,000 projections. CONCLUSION: Using the proposed method, good image quality was observed for free breathing whole-heart coronary MRA at (1.0 mm)(3) resolution with an achievable scan time of 5 min.
PURPOSE: To achieve whole-heart coronary magnetic resonance angiography (MRA) with (1.0 mm)(3) spatial resolution and 5 min of free-breathing scan time. METHODS: We used an electrocardiograph-gated, T2-prepared and fat-saturated balanced steady state free precession sequence with 3DPR trajectory for free-breathing data acquisition with 100% gating efficiency. For image reconstruction, we used a self-calibrating iterative SENSE scheme with integrated retrospective motion correction. We performed healthy volunteer study to compare the proposed method with motion-corrected gridding at different retrospective undersampling levels on apparent signal-to-noise ratio (aSNR) and subjective coronary artery (CA) visualization scores. RESULTS: Compared with gridding, the proposed method significantly improved both image quality metrics for undersampled datasets with 6000, 8000, and 10,000 projections. With as few as 10,000 projections, the proposed method yielded good CA visualization scores (3.02 of 4) and aSNR values comparable to those with 20,000 projections. CONCLUSION: Using the proposed method, good image quality was observed for free breathing whole-heart coronary MRA at (1.0 mm)(3) resolution with an achievable scan time of 5 min.
Authors: Charles A McKenzie; Ernest N Yeh; Michael A Ohliger; Mark D Price; Daniel K Sodickson Journal: Magn Reson Med Date: 2002-03 Impact factor: 4.668
Authors: M Stuber; R M Botnar; P G Danias; M V McConnell; K V Kissinger; E K Yucel; W J Manning Journal: J Magn Reson Imaging Date: 1999-11 Impact factor: 4.813
Authors: Jieying Luo; Nii Okai Addy; R Reeve Ingle; Corey A Baron; Joseph Y Cheng; Bob S Hu; Dwight G Nishimura Journal: Magn Reson Med Date: 2016-05-13 Impact factor: 4.668