Table 1.

A comparison of techniques between the existing 2D Spottiswoode et al and the new 3D semi-automated technique for motion-based LV wall detection

Attribute	2D Spottiswoode et al method	3D semi-automated method
Modality/sequence	MRI/DENSE	MRI/DENSE
Dimension of processed data	2D	3D
Primary contour detection algorithm	Phase-encoded displacements	Phase-encoded displacements
Secondary contour detection algorithm	Modulus deformation mask	Multi-threshold based quantization
Chamber quantifications	No direct method	EDV, ESV, EF
Initial ROI	Bounding torus	Bounding ellipsoid
Processing speed	1–2 min per 2D slice	<5 min for entire LV
Manual modification	Possible	Possible
Strain estimations	Slice-based	Entire volume
Surface strain maps	None	Possible

2D, two-dimensional; 3D, three-dimensional; DENSE, Displacement Encoding with Stimulated Echoes; EDV, end-diastolic volume; EF, ejection fraction; ESV, end-systolic volume; LV, left-ventricle; ROI, region of interest.