Pattern independent deformation estimation illustrated by MRI

Patient motion during SPECT imaging has been shown to produce artifacts. Our previous work has corrected for patient motion using an optical imaging system to detect retro-reflective markers on the patient’s surface. This paper makes two contributions to this work: 1) We introduce an algorithm that allows an arbitrary marker pattern and gives technicians freedom on where to place the markers, and 2) We use MRI data to validate the estimation of patient motion with our improved algorithm. The goal is to show that estimation of volume motion inside patients is consistent with interior motion observed by MRI.