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Comparison of right ventricular volume measurement between segmented k-space gradient-echo and steady-state free
Khaled Alfakih1, Holger Thiele, Sven Plein
1BHF Cardiac MRI Unit, Leeds General Infirmary, Leeds, UK. khaledk100@hotmail.com
Purpose:
To compare right ventricular volume measurements and their reproducibility between steady-state free precession (SSFP) and conventional turbo gradient-echo (TGE) imaging.
Materials And Methods:
Right ventricular volumes and observer variabilities were compared between SSFP and TGE in 31 subjects (21 normal volunteers and 10 subjects with heart failure). For further internal validation of the right ventricular volumes, the left ventricle (LV) and right ventricle (RV) stroke volumes were compared for the normal volunteers.
Results:
The volumes as measured by SSFP were significantly larger than for TGE (mean bias end-diastolic volume [EDV] 11.1 +/- 14.2, end-systolic volume [ESV] 9.8 +/- 9.75). SSFP had lower interobserver variability (SSFP EDV -10.1 +/- 11.6 vs. TGE EDV -6.2 +/- 18.5) and intra-observer variability (SSFP EDV -2.0 +/- 6.3 vs. TGE EDV -6.1 +/- 14.8). The mean absolute differences between LV and RV stroke volumes for 21 normal volunteers were: TGE 5.8 +/- 12.9 (r(2) = 0.72), SSFP 4.6 +/- 6.9 (r(2) = 0.92).
Conclusion:
SSFP and TGE yield different measurement values of RV volumes with SSFP, providing a more reproducible measurement.