Medial Axis Registration of Supine and Prone CT Colonography Data
STANFORD UNIV PALO ALTO CA
Pagination or Media Count:
Computed Tomographic Colonography CTC is a minimally invasive method that allows the examination of the colon wall from the source CT sections or in a virtual environment. The primary goal of CTC is the detection of colonic polyps. There are typically two data sets recorded in supine and prone positions. An important step in polyp detection is the anatomical registration of these datasets. We developed and experimentally validated a method to register complementary supine and prone CTC datasets anatomically, using linear stretchingshrinking operations on the medial axis colonic path based on the relative path geometries. To compare improvement in spatial registration of supine and prone datasets, a radiologist determined 5 unique reference points RP in the registered and unregistered datasets from each of 5 patients by viewing supine and prone data simultaneously. Initial results suggest that our algorithm is capable of registering supine and prone CTC data anatomically within an approximate range of - 13.2mm, which corresponds to 0.8 error with respect to the average colon length.
- Medicine and Medical Research