Open AccessInvestigation on slice direction dependent detectability of volumetric cone beam CT images
Author(s) -
Minah Han,
Chang-Woo Lee,
Subok Park,
Jongduk Baek
Publication year - 2016
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.24.003749
Subject(s) - transverse plane , optics , physics , observer (physics) , image plane , signal (programming language) , detector , plane (geometry) , artificial intelligence , computer science , mathematics , geometry , image (mathematics) , structural engineering , quantum mechanics , engineering , programming language
We investigate the detection performance of transverse and longitudinal planes for various signal sizes (i.e., 1 mm to 8 mm diameter spheres) in cone beam computed tomography (CBCT) images. CBCT images are generated by computer simulation and images are reconstructed using an FDK algorithm. For each slice direction and signal size, a human observer study is conducted with a signal-known-exactly/background-known-exactly (SKE/BKE) binary detection task. The detection performance of human observers is compared with that of a channelized Hotelling observer (CHO). The detection performance of an ideal linear observer is also calculated using a CHO with Laguerre-Gauss (LG) channels. The detectability of high contrast small signals (i.e., up to 4-mm-diameter spheres) is higher in the longitudinal plane than the transverse plane. It is also shown that CHO performance correlates well with human observer performance in both transverse and longitudinal plane images.