A pseudoinverse deformation vector field generator and its applications

Abstract

Use of DVF and its PIDVF will improve the self-consistency of points, contour, and dose mappings in image guided adaptive therapy.

Toward adaptive radiotherapy for head and neck patients: Uncertainties in dose warping due to the choice of deformable registration algorithm

“…NiftyReg also features a numerical estimation of the inverse of a deformation field, which uses an iterative method to estimate each vector of the inverse deformation vector field (DVF) independently using the simplex algorithm. It is similar to other published implementations 24,35 but independently developed. This algorithm is also implemented in the GPU.…”

“…Yan et al showed that the dose mapping inverse consistency error observed when mapping doses back-and-forth was reduced 1.5-3 times when the spatial inverse consistency was improved. 35 The reliability of using dose warping in clinical settings is a current and open debate. 40 Our work contributes to this discussion by evaluating theoretically better DIR algorithms and investigating the uncertainties in dose warping due to the choice of algorithm in ART frameworks that use CT-to-CBCT registration.…”

Iterative inversion of deformation vector fields with feedback control

“…Inversion errors are calculated pixel-wise by e k (x) = v k (x) À v(x), with the estimate at the k-th iteration step and x 2 Ω; see (2). They are presented in two complementary views.…”

A method to estimate the effect of deformable image registration uncertainties on daily dose mapping

“…One can study the effects of image registration errors on dose accumulation by various methods. Yan et al 6 considered how inverse consistency (or its absence) in the DVF can affect dose mapping error. Empirically, a calculated dose accumulation can be compared directly to measurements in a deformable phantom.…”