Abstract
In this paper, we propose a double-layered cadmium zinc telluride Compton camera using the weighted list-mode maximum likelihood expectation maximization (MLEM) method. We performed a Monte Carlo simulation of the performance. The detection system comprised two detector arrays arranged in parallel. Each array consisted of 6 \times 6 crystals with a 7.5 mm pixel pitch. The dimension of a single crystal was 6 \times 6 \times 15 mm. For Compton imaging, the 137Cs activity was set to 78 kBq and the acquisition time was set to 2 hours. By applying the weighted MLEM method, the events with small angular uncertainty were more emphasized than those with large angular uncertainty. Each angular uncertainty was calculated based on the energy and geometry uncertainties of each event. We compared the traditional list-mode MLEM and the weighted list-mode MLEM for single and double detector arrays. The results showed that the combination of a double-layered imager with the weighted MLEM method represented the best image performance compared to other combinations. The sources at the offset positions were also simulated to estimate the directional dependency of the camera system.
| Original language | English |
|---|---|
| Article number | 7756299 |
| Pages (from-to) | 1769-1773 |
| Number of pages | 5 |
| Journal | IEEE Transactions on Nuclear Science |
| Volume | 64 |
| Issue number | 7 |
| DOIs | |
| Publication status | Published - 2017 Jul 1 |
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Keywords
- Cadmium zinc telluride
- Compton camera
- weighted list-mode maximum likelihood estimation
ASJC Scopus subject areas
- Nuclear and High Energy Physics
- Nuclear Energy and Engineering
- Electrical and Electronic Engineering
Cite this
Double-Layered CZT Compton Imager. / Kim, Young Hak; Lee, Taewoong; Lee, Won Ho.
In: IEEE Transactions on Nuclear Science, Vol. 64, No. 7, 7756299, 01.07.2017, p. 1769-1773.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Double-Layered CZT Compton Imager
AU - Kim, Young Hak
AU - Lee, Taewoong
AU - Lee, Won Ho
PY - 2017/7/1
Y1 - 2017/7/1
N2 - In this paper, we propose a double-layered cadmium zinc telluride Compton camera using the weighted list-mode maximum likelihood expectation maximization (MLEM) method. We performed a Monte Carlo simulation of the performance. The detection system comprised two detector arrays arranged in parallel. Each array consisted of 6 \times 6 crystals with a 7.5 mm pixel pitch. The dimension of a single crystal was 6 \times 6 \times 15 mm. For Compton imaging, the 137Cs activity was set to 78 kBq and the acquisition time was set to 2 hours. By applying the weighted MLEM method, the events with small angular uncertainty were more emphasized than those with large angular uncertainty. Each angular uncertainty was calculated based on the energy and geometry uncertainties of each event. We compared the traditional list-mode MLEM and the weighted list-mode MLEM for single and double detector arrays. The results showed that the combination of a double-layered imager with the weighted MLEM method represented the best image performance compared to other combinations. The sources at the offset positions were also simulated to estimate the directional dependency of the camera system.
AB - In this paper, we propose a double-layered cadmium zinc telluride Compton camera using the weighted list-mode maximum likelihood expectation maximization (MLEM) method. We performed a Monte Carlo simulation of the performance. The detection system comprised two detector arrays arranged in parallel. Each array consisted of 6 \times 6 crystals with a 7.5 mm pixel pitch. The dimension of a single crystal was 6 \times 6 \times 15 mm. For Compton imaging, the 137Cs activity was set to 78 kBq and the acquisition time was set to 2 hours. By applying the weighted MLEM method, the events with small angular uncertainty were more emphasized than those with large angular uncertainty. Each angular uncertainty was calculated based on the energy and geometry uncertainties of each event. We compared the traditional list-mode MLEM and the weighted list-mode MLEM for single and double detector arrays. The results showed that the combination of a double-layered imager with the weighted MLEM method represented the best image performance compared to other combinations. The sources at the offset positions were also simulated to estimate the directional dependency of the camera system.
KW - Cadmium zinc telluride
KW - Compton camera
KW - weighted list-mode maximum likelihood estimation
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UR - http://www.scopus.com/inward/citedby.url?scp=85029095969&partnerID=8YFLogxK
U2 - 10.1109/TNS.2016.2632977
DO - 10.1109/TNS.2016.2632977
M3 - Article
AN - SCOPUS:85029095969
VL - 64
SP - 1769
EP - 1773
JO - IEEE Transactions on Nuclear Science
JF - IEEE Transactions on Nuclear Science
SN - 0018-9499
IS - 7
M1 - 7756299
ER -