Figure 2:

Visual representation of Jacobian (J) and anisotropic deformation index (ADI) values. A Jacobian greater than 1 implies expansion of a voxel between inspiration and expiration, a Jacobian of 1 implies no volume change, and a Jacobian of less than 1 implies voxel contraction. An ADI of 0 implies that a voxel completely preserves its shape between inspiration and expiration, while an increasing ADI implies more anisotropic expansion.