Browse

Fully three-dimensional OSEM-based image reconstruction for Compton imaging using optimized ordering schemes

Cited 15 time in Web of Science Cited 14 time in Scopus
Authors
Kim, Soo Mee; Lee, Jae Sung; Lee, Chun Sik; Kim, Chan Hyeong; Lee, Dong Soo; Lee, Soo-Jin; Lee, Myung Chul
Issue Date
2010-09-07
Publisher
IOP PUBLISHING LTD
Citation
PHYSICS IN MEDICINE AND BIOLOGY; Vol.55 17; 5007-5027
Abstract
Although the ordered subset expectation maximization (OSEM) algorithm does not converge to a true maximum likelihood solution, it is known to provide a good solution if the projections that constitute each subset are reasonably balanced. The Compton scattered data can be allocated to subsets using scattering angles (SA) or detected positions (DP) or a combination of the two (AP (angles and positions)). To construct balanced subsets, the data were first arranged using three ordering schemes: the random ordering scheme (ROS), the multilevel ordering scheme (MLS) and the weighted-distance ordering scheme (WDS). The arranged data were then split into J subsets. To compare the three ordering schemes, we calculated the coefficients of variation (CVs) of angular and positional differences between the arranged data and the percentage errors between mathematical phantoms and reconstructed images. All ordering schemes showed an order-of-magnitude acceleration over the standard EM, and their computation times were similar. The SA-based MLS and the DP-based WDS led to the best-balanced subsets (they provided the largest angular and positional differences for SA-and DP-based arrangements, respectively). The WDS exhibited minimum CVs for both the SA-and DP-based arrangements (the deviation in mean angular and positional differences between the ordered subsets was smallest). The combination of AP and WDS yielded the best results with the lowest percentage errors by providing larger and more uniform angular and positional differences for the SA and DP arrangements, and thus, is probably optimal Compton camera reconstruction using OSEM.
ISSN
0031-9155
Language
English
URI
http://hdl.handle.net/10371/78322
DOI
https://doi.org/10.1088/0031-9155/55/17/009
Files in This Item:
There are no files associated with this item.
Appears in Collections:
College of Medicine/School of Medicine (의과대학/대학원)Nuclear Medicine (핵의학전공)Journal Papers (저널논문_핵의학전공)
  • mendeley

Items in S-Space are protected by copyright, with all rights reserved, unless otherwise indicated.

Browse