SPECT 영상 산란보정 개선: 몬테칼로 시뮬레이션 연구 (Improved Scatter Correction for SPECT Images : A Monte Carlo Simulation Study) |
Author |
봉정균1·김희중1,2·손혜경2·이종두1,2·정해조2, |
Jung-Kyun Bong, Ph.D.2, Hee-Joung Kim, Ph.D.1,2, Hye-Kyung Son, M.Sc.2, Jong Doo Lee, MD & Ph.D.1,2, Hae-Jo Jung, Ph.D.2 |
Affiliation |
연세대학교 핵의학과1, 진단방사선과 방사선의과학 연구소2 Division of Nuclear Medicine,1 Department of Radiology, Yonsei University College of Medicine, Research Institute of Radiological Science,2 Yonsei University |
Abstract |
Purpose: Abutted scatter energy windows used for a triple energy window (TEW) method may provide wrong
estimation of scatter. This study is to propose an extended TEW (ETEW) method, which doesn't require abutted
scatter energy windows and overcomes the shortcomings of TEW method. Materials & Methods: The ETEW is a
modification of the TEW which corrects for scatter by using abutted scatter rejection windows, which can
overestimate or underestimate scatter. The ETEW is compared to the TEW using Monte Carlo simulated data for
point sources as well as hot and cold spheres in a cylindrical water phantom. Various main energy window
widths (10 %, 15 % and 20 %) were simulated. Both TEW and ETEW improved image contrast, % recovery
coefficients and normalized standard deviation. Results: Both of TEW and ETEW improved image contrast and %
recovery coefficients. Estimated scatter components by the TEW were not proportional to the true scatter
components over the main energy windows when ones of 10 %, 15 %, and 20 % were simulated. The ETEW
linearly estimated scatter components over the width of the main energy windows. Conclusion: We extended the
TEW method into the method which could linearly estimate scatter components over the main energy
windows.(Korean J Nucl Med 39(3):163-173, 2005) |
Keyword |
TEW scatter correction, ETEW scatter correction, SPECT, energy window |
Full text Article |
39030163.pdf
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