Abstract
Recently, many studies have investigated the use of a pixelated semiconductor detector to improve spatial resolution. The purpose of this study was to evaluate novel parallel-hole collimator geometric designs with a CdTe pixelated semiconductor single-photon-emission computed tomography (SPECT) system. The pixelated semiconductor detector was modeled as a PID 350 detector (Ajat Oy Ltd., Finland) with small pixels (0.35 × 0.35 mm2) by using Geant4 Application for Tomographic Emission (GATE) software. We designed a novel parallel-hole collimator consisting of two overlapping parallel-hole collimators. Each hole size was four times that of the pixelated parallel-hole collimator. The overlap ratios of these collimators were 1:1, 1:2, 2:1, 1:3, 3:1, 1:4, and 4:1. To evaluate the performance of this system, we evaluated the sensitivity and the spatial resolution. The results for our new parallel-hole collimator indicated that the evaluated sensitivity averages using overlap ratios of 1:1, 1:2, 2:1, 1:3, 3:1, 1:4, and 4:1 were 4.45, 7.56, 7.51, 12.76, 12.65, 20.01, and 19.90 times higher, respectively, than those of the pixelated parallel-hole collimator. The evaluated averages of the spatial resolution varied depending on the source-to-collimator distances. In conclusion, we successfully designed a novel parallel-hole collimator with various overlap ratios of the collimator septal heights with a CdTe pixelated semiconductor SPECT system. Based on our results, we recommend using this collimator with a CdTe pixelated semiconductor SPECT system.
Similar content being viewed by others
References
P. Murphy, R. Arseneau, E. Maxon and W. Thompson, J. Nucl. Med. 18, 175 (1977).
J. E. Arnold, A. S. Johnston, and S. M. Pinsky, J. Nucl. Med. 15, 412 (1973).
M. T. Madsen, J. Nucl. Med. 48, 661 (2007).
L. J. Meng, J. W. Tan, K, Spartiotis and T. Schulman, Nucl. Instrum. Meth. Phys. Res. A 604, 548 (2009).
L. Guerin, L. Verger, V. Rebuffel, and O. Monnet, IEEE Trans. Nucl. Sci. 55, 1573 (2008).
H. Kim et al., Med. Phys. 33, 465 (2006).
L. Verger et al., IEEE Trans. Nucl. Sci. 51, 3111 (2004).
K. Ogawa and M. Muraishi, IEEE Trans. Nucl. Sci. 57, 17 (2010).
S. Jan et al., Phys. Med. Biol. 49, 4543 (2004).
D. Lazaro et al., Phys. Med. Biol. 49, 271 (2004).
I. Buvat and D. Lazaro, Nucl. Instrum. Meth. Phys. Res. A 569, 323 (2006).
D. Lazaro, Z. E. Bitar, V. Breton, D. Hill and I. Buvat, Phys. Med. Biol. 50, 3739 (2005).
S. Staelens, D. Strul, G. Santin, S. Vandenberghe, M. Koole, Y. D’Asseler, I. Lemahieu and R. V. Walle, Phys. Med. Biol. 48, 3021 (2003).
S. D. Sordo, L. Abbene, E. Caroli, A. M. Mancini, A. Zappettini and P. Ubertini, Sensors 9, 3491 (2009).
C. Scheiber, Nucl. Instrum. Meth. Phys. Res. A 448, 513 (2000).
H. Toyokawa et al., Nucl. Instrum. Meth. Phys. Res. A 636, 5218 (2011).
K. Tsuchiya, I. Takahashi, T. Kawaguchi, K. Yokoi, Y. Morimoto, T. Ishitsu, A. Suzuki, Y. Ueno and K. Kobashi, Ann. Nucl. Med. 24, 301 (2010).
H. Wieczorek and A. Goedicke, IEEE Trans. Nucl. Sci. 53, 1102 (2006).
A. S. Ahmed, G. H. Kramer, W. Semmler and J. Peter, Nucl. Instrum. Meth. Phys. Res. A 629, 368 (2011).
Y. J. Lee, H. J. Ryu, S. W. Lee, S. J. Park and H. J. Kim, Nucl. Instrum. Meth. Phys. Res. A 713, 33 (2013).
T. Frese, N. C. Rouze, C. A. Bouman, K. Sauer and G. D. Hutchins, IEEE Trans. Nucl. Sci. 22, 258 (2003).
Y. J. Lee, H. J. Ryu, H. M. Cho, S. W. Lee, Y. N. Choi and H. J. Kim, J. Korean Phys. Soc. 60, 862 (2012).
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Lee, YJ., Kim, DH., Rhee, YC. et al. Monte carlo simulation study of a novel parallel-hole collimator with a CdTe pixelated semiconductor SPECT system. Journal of the Korean Physical Society 64, 1737–1744 (2014). https://doi.org/10.3938/jkps.64.1737
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.3938/jkps.64.1737