Cardiovascular magnetic resonance feature tracking in small animals – a preliminary study on reproducibility and sample size calculation

Table 2 Comparison of CMR-FT derived strain parameters obtained by observers in six mice (72 measures for longitudinal and 36 measures for circumferential and radial strain respectively)

	Measurements obtained by two observers (inter-observer level)
	First observer	Second observer
Ell_LAX (%)	−10.32 ± 5.47	−11.97 ± 6.36
Ecc_SAX (%)	−9.60 ± 3.68	−11.97 ± 5.97
Err_SAX (%)	12.59 ± 6.78	12.64 ± 7.23
	Measurements obtained by one observer (intra-observer level)
	First measurement	Second measurement
Ell_LAX (%)	−10.32 ± 5.47	−11.57 ± 6.84
Ecc_SAX (%)	−9.60 ± 3.68	−8.48 ± 6.50
Err_SAX (%)	12.59 ± 6.78	10.32 ± 7.88

Results are expressed as mean ± standard deviation. Ell _LAX left ventricular long-axis longitudinal strain, Ecc _SAX left ventricular short-axis circumferential strain, Err _SAX left ventricular short-axis radial strain

ISSN: 1471-2342