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Table 3 The SD and required sample size to show a clinical change with a power of 90% and an α error of 0.05 to detect a change of the Ved and Ves of 10 ml and an absolute change in the EF of 3% for SA images before and after registration.1

From: Correction of misaligned slices in multi-slice cardiovascular magnetic resonance using slice-to-volume registration

  SA images before registration SA images after registration  
  SD Sample size SD Sample size Reduction in sample size
10 ml change in V ed 5.8 7.1 (8) 4.2 3.7 (4) 48%
10 ml change in V es 3.4 2.4 (3) 1.8 0.7 (1) 71%
3% absolute change in EF 1.9 8.4 (9) 1.3 3.9 (4) 53%
  1. 1SD = standard deviation, SA = short axis, Ved = end-diastolic left ventricular volume, Ves = end-systolic left ventricular volume, EF = ejection fraction.