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Assessment of Attenuation Correction Techniques with a $^{137}Cs$ Point Source  

Bong, Jung-Kyun (Department of Radiology, Yonsei University College of Medicine Research Institute of Radiological Science, Yonsei University)
Kim, Hee-Joung (Division of Nuclear Medicine, Yonsei University)
Son, Hye-Kyoung (Department of Radiology, Yonsei University College of Medicine Research Institute of Radiological Science, Yonsei University)
Park, Yun-Young (Department of Radiology, Yonsei University College of Medicine Research Institute of Radiological Science, Yonsei University)
Park, Hae-Joung (Division of Nuclear Medicine, Yonsei University)
Yun, Mi-Jin (Division of Nuclear Medicine, Yonsei University)
Lee, Jong-Doo (Department of Radiology, Yonsei University College of Medicine Research Institute of Radiological Science, Yonsei University)
Jung, Hae-Jo (Department of Radiology, Yonsei University College of Medicine Research Institute of Radiological Science, Yonsei University)
Publication Information
The Korean Journal of Nuclear Medicine / v.39, no.1, 2005 , pp. 57-68 More about this Journal
Abstract
Purpose: The objective of this study was to assess attenuation correction algorithms with the $^{137}Cs$ point source for the brain positron omission 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 $^{137}Cs$ 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: ELEC, 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.
Keywords
Positron emission tomography; Attenuation correction; $^{137}Cs$ point source;
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