Quantitative comparison of myocardial fiber structure between mice, rabbit, and sheep using diffusion tensor cardiovascular magnetic resonance

Table 2 Measured myocardial fiber orientation.

	Species	Septal wall	Lateral free wall	Anterior free wall	Posterior free wall
Range	Mouse	129.8 ± 12.9	124.2 ± 18.8	127.7 ± 16.7	123.5 ± 17.9
	Rabbit	82.5 ± 17.9	75.8 ± 15.2	72.7 ± 19.1	78.7 ± 12.8
	Sheep	59.5 ± 16.1	58.2 ± 14.2	52.1 ± 14.3	58.1 ± 15.5
Subepicardial Helix Angle	Mouse	-58.6 ± 9.53	-50.2 ± 14.7	-35.9 ± 14.6	-46.9 ± 14.4
	Rabbit	-42.6 ± 14.9	-29.9 ± 14.6	-27.7 ± 11.4	-23.7 ± 13.9
	Sheep	-28.2 ± 19.2	-30.2 ± 8.74	-24.3 ± 9.64	-26.6 ± 9.26
Linearity	Mouse	0.98 ± 0.011	0.99 ± 0.011	0.97 ± 0.025	0.98 ± 0.017
	Rabbit	0.93 ± 0.14	0.94 ± 0.038	0.94 ± 0.050	0.97 ± 0.028
	Sheep	0.91 ± 0.070	0.95 ± 0.044	0.95 ± 0.055	0.94 ± 0.052

Fiber orientation is as characterized by the transmural range and linearity of the fiber helix angle, and subepicardial helix angle, as functions of both species and circumferential location of the ROI. Both the angular range and subepicardial angle are reported in degrees, whereas the linearity is dimensionless. All entries are mean ± SD.

ISSN: 1532-429X