A comprehensive reliability assessment of quantitative diffusion tensor tractography

► Reconstructed 9 tracts from DTI with 15 (NEX 2) and 30 directions (NEX1 and 2). ► Assessed intra- and inter-session reliabilities for tractography measurements. ► Many tractography measurements (37-43/60) showed high intersession reliability. ► Increasing gradient directions from 15 to 30 improved intersession reliability. ► Scan repetition reduced bias in many tractography measurements.