Comparison between free-breathing true-fisp cine sequences: radial vs cartesian k-space reconstruction

Abstract

Methods Left and right ventricular volume and function studies were performed in 11 consecutive patients. Three different true-FISP sequences were acquired using a 1.5 T scanner: free-breathing single shot with radial k-space reconstruction, free-breathing single shot with Cartesian k-space reconstruction, and breath-hold (BH) segmented acquisition with Cartesian k-space reconstruction. For the radial and Cartesian sequences the temporal resolution was 77 ms and 79 ms, respectively, and for the segmented Cartesian acquisition the temporal resolution was 45 ms. Ventricular cavities were manually segmented at end-diastolic and end-systolic phases. The BH sequence was used as the reference standard, and a Bland-Altman analysis was performed to evaluate the free-breathing sequences. Results With the BH sequence the mean ± SD LV EF was 51.5 ± 20% (range 22.3% 73.6%), and the RV EF was 49.8 ± 21% (range 7.8% 72.9%). With the free breathing Cartesian k-space reconstruction sequence the LV EF was 50.1 ± 24% (range 16.6% 88%), and the RV EF was 45.1 ± 20% (range 11.6% 70.5%). With the free-breathing radial kspace reconstruction sequence LV EF was 52.7 ± 21% (range 24.1% 81%), and the RV EF was 45.7 ± 17% (range 14% 72.6%). RV and LV end systolic (ES) and end diastolic (ED) Volumes (V) are reported in table 1.