Abstract
The image resolution of computed tomography (CT) scan system can be affected by numbers of factors such as collimator material, collimator design, stopping power of detector and scatter photons rejection and/or correction technique. The scatter photons are one of the major sources of background noise that can immensely degrade the image quality of the CT system. The image quality, in turn, affects the discrimination and identification performance of the system especially in the case of dual-energy CT systems for material decomposition. Therefore, for material identification, acquisition of raw data with minimal noise is of immense importance. In this simulation study, the performance of two types of collimators was evaluated to come up with a better collimator design for background noise compression. Both collimators were made of tungsten with similar length of 30 mm but with different hole shapes (fan and parallel). In both cases, results suggest that there is a clear improvement in terms of spatial resolution. In a comparison of grids structure, fan grid performed slightly better than parallel for most of the cases. The peak-to-valley (PV) ratio for 122 keV gamma radiation source improved on average ∼0.16 (16%) and ∼0.23 (23%) for fan collimator and parallel collimator respectively. For 60 keV gamma source, the improvements were ∼0.14 (14%) and ∼0.17 (17%) respectively. Thus, from the results, it can be concluded that fan grid collimator can provide superior performance compared to parallel grid collimator.
| Original language | English |
|---|---|
| Pages (from-to) | 79-85 |
| Number of pages | 7 |
| Journal | Journal of the Korean Physical Society |
| Volume | 76 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 2020 Jan 1 |
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Keywords
- Arch detector
- CT
- Dual energy
- Material detection
ASJC Scopus subject areas
- Physics and Astronomy(all)
Cite this
Collimators for Gamma Dual Energy CT Arch-Detector : A Simulation Study. / Pratiwi, Eva; Bae, Seungbin; Lee, Hakjee; Ullah, Muhammad Nasir; Lee, Boram; Lee, Kisung; Yeom, Jungyeol.
In: Journal of the Korean Physical Society, Vol. 76, No. 1, 01.01.2020, p. 79-85.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Collimators for Gamma Dual Energy CT Arch-Detector
T2 - A Simulation Study
AU - Pratiwi, Eva
AU - Bae, Seungbin
AU - Lee, Hakjee
AU - Ullah, Muhammad Nasir
AU - Lee, Boram
AU - Lee, Kisung
AU - Yeom, Jungyeol
PY - 2020/1/1
Y1 - 2020/1/1
N2 - The image resolution of computed tomography (CT) scan system can be affected by numbers of factors such as collimator material, collimator design, stopping power of detector and scatter photons rejection and/or correction technique. The scatter photons are one of the major sources of background noise that can immensely degrade the image quality of the CT system. The image quality, in turn, affects the discrimination and identification performance of the system especially in the case of dual-energy CT systems for material decomposition. Therefore, for material identification, acquisition of raw data with minimal noise is of immense importance. In this simulation study, the performance of two types of collimators was evaluated to come up with a better collimator design for background noise compression. Both collimators were made of tungsten with similar length of 30 mm but with different hole shapes (fan and parallel). In both cases, results suggest that there is a clear improvement in terms of spatial resolution. In a comparison of grids structure, fan grid performed slightly better than parallel for most of the cases. The peak-to-valley (PV) ratio for 122 keV gamma radiation source improved on average ∼0.16 (16%) and ∼0.23 (23%) for fan collimator and parallel collimator respectively. For 60 keV gamma source, the improvements were ∼0.14 (14%) and ∼0.17 (17%) respectively. Thus, from the results, it can be concluded that fan grid collimator can provide superior performance compared to parallel grid collimator.
AB - The image resolution of computed tomography (CT) scan system can be affected by numbers of factors such as collimator material, collimator design, stopping power of detector and scatter photons rejection and/or correction technique. The scatter photons are one of the major sources of background noise that can immensely degrade the image quality of the CT system. The image quality, in turn, affects the discrimination and identification performance of the system especially in the case of dual-energy CT systems for material decomposition. Therefore, for material identification, acquisition of raw data with minimal noise is of immense importance. In this simulation study, the performance of two types of collimators was evaluated to come up with a better collimator design for background noise compression. Both collimators were made of tungsten with similar length of 30 mm but with different hole shapes (fan and parallel). In both cases, results suggest that there is a clear improvement in terms of spatial resolution. In a comparison of grids structure, fan grid performed slightly better than parallel for most of the cases. The peak-to-valley (PV) ratio for 122 keV gamma radiation source improved on average ∼0.16 (16%) and ∼0.23 (23%) for fan collimator and parallel collimator respectively. For 60 keV gamma source, the improvements were ∼0.14 (14%) and ∼0.17 (17%) respectively. Thus, from the results, it can be concluded that fan grid collimator can provide superior performance compared to parallel grid collimator.
KW - Arch detector
KW - CT
KW - Dual energy
KW - Material detection
UR - http://www.scopus.com/inward/record.url?scp=85077679233&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85077679233&partnerID=8YFLogxK
U2 - 10.3938/jkps.76.79
DO - 10.3938/jkps.76.79
M3 - Article
AN - SCOPUS:85077679233
VL - 76
SP - 79
EP - 85
JO - Journal of the Korean Physical Society
JF - Journal of the Korean Physical Society
SN - 0374-4884
IS - 1
ER -