Table 1.

Formule for computing the yrTA, yrVE, and yrRTA under 2D and 3D methodologies.

	yrTA	yrVE	yrRTA
2D	(A1+A′1)-(A2+A′2) x 120/(#months between MRI studies)	(B2-B1) × 120/(#months between MRI studies)	(A1+A′1)-(A2+A′2) × 120/(B2-B1) × (#months between MRI studies)
3D	(A1+A′1)-(A2+A′2) × 120/(#months between MRI studies)	(C2+C’2+D2)-(C1+C’1+D1) × 120/(#months between MRI studies)	(A1+A′1)-(A2+A′2) × 120/(C2+C’2+D2)- (C1+C’1+D1) × (#months between MRI studies)

Numbers 1 and 2 represent the first (1) and second (2) MRI studies.