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Cs-137 점선원을 이용한 감쇠 보정기법들의 평가

Other Titles
 Assessment of Attenuation Correction Techniques with a 137Cs Point Source 
 봉정균  ;  김희중  ;  손혜경  ;  권윤영  ;  박해정  ;  윤미진  ;  이종두  ;  정해조  ;  송혜경 
 Korean Journal of Nuclear Medicine (대한핵의학회지), Vol.39(1) : 57-68, 2005 
Journal Title
Korean Journal of Nuclear Medicine(대한핵의학회지)
Issue Date
Positron emission tomography ; Attenuation correction ; 137Cs point source
Purpose: The objective of this study was to assess attenuation correction algorithms with the 137Cs point source for the brain positron emission tomography (PET) imaging process.
Materials & Methods: Four different types of phantoms were used in this study for testing various types of the attenuation correction techniques. Transmission data of a 137Cs point source were acquired after infusing the emission source into phantoms and then the emission data were subsequently acquired in 3D acquisition mode. Scatter corrections were performed with a background tail-fitting algorithm. Emission data were then reconstructed using iterative reconstruction method with a measured (MAC), elliptical (ELAC), segmented (SAC) and remapping (RAC) attenuation correction, respectively. Reconstructed images were then both qualitatively and quantitatively assessed. In addition, reconstructed images of a normal subject were assessed by nuclear medicine physicians. Subtracted images were also compared.
Results: ELAC, SAC, and RAC provided a uniform phantom image with less noise for a cylindrical phantom. In contrast, a decrease in intensity at the central portion of the attenuation map was noticed at the result of the MAC. Reconstructed images of Jaszack and Hoffan phantoms presented better quality with RAC and SAC. The attenuation of a skull on images of the normal subject was clearly noticed and the attenuation correction without considering the attenuation of the skull resulted in artificial defects on images of the brain.
Conclusion: the complicated and improved attenuation correction methods were needed to obtain the better accuracy of the quantitative brain PET images.
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Appears in Collections:
1. College of Medicine (의과대학) > Dept. of Nuclear Medicine (핵의학교실) > 1. Journal Papers
1. College of Medicine (의과대학) > Dept. of Radiology (영상의학교실) > 1. Journal Papers
1. College of Medicine (의과대학) > Yonsei Biomedical Research Center (연세의생명연구원) > 1. Journal Papers
Yonsei Authors
Kim, Hee Joung(김희중)
Park, Hae Jeong(박해정) ORCID logo https://orcid.org/0000-0002-4633-0756
Bong, Jung Kyun(봉정균)
Son, Hye Kyoung(손혜경)
Yun, Mi Jin(윤미진) ORCID logo https://orcid.org/0000-0002-1712-163X
Lee, Jong Doo(이종두)
Jeong, Hai Jo(정해조)
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