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- W618038975 abstract "2634 Objectives The purpose of this study was to compare count between Chang9s method and CT-based attenuation correction (AC-CT) among the attenuation correction (AC) methods for non-attenuation correction (AC-non) images of Brain SPECT (Single Photon Emission Computed Tomography). Methods We injected 99mTc 37Mbq in a Hoffman 3D phantom filled with distilled water in the phantom study, and injected intravenously 99mTc-HMPAO 750Mbq in a normal volunteer in the patient study, and then obtained Brain SPECT images with Symbia T6 of Siemens and conducted quantitative brain analysis. Transverse images to which each method was applied were rebuilt at the same position, and 6 regions of interest (ROI) were drawn on each of Slice No. 5, 10, 15, 20, 25 and 30 and then the counts of AC-non, AC-CT and Chang9s method were compared. Results The mean counts of AC-non, AC-CT and Chang9s method were 4606.8 ± 511.3, 16794.6 ± 2429.4, and 8752.6 ± 896.5, respectively, in the phantom study and 5460.8 ±519.6, 15320 ± 1171.6 and 12795 ± 1422.1, respectively, in the patient study. In the phantom study, the ratio of AC-CT to AC-non was 3.70 and the ratio of Chang9s method to AC-non was 1.92, and in the patient study, they were 2.85 and 2.38, respectively. Conclusions From this study, we found that AC-CT makes higher AC than Chang9s method. In addition, when Chang9s method was used, AC in the patient study was higher than that in the phantom study. These results need to be considered also in other examinations" @default.
- W618038975 created "2016-06-24" @default.
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- W618038975 date "2012-05-01" @default.
- W618038975 modified "2023-09-23" @default.
- W618038975 title "Comparison of attenuation correction methods for brain SPECT images" @default.
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