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KMID : 0357520180410040321
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Journal of Radiological Science and Technology
2018 Volume.41 No. 4 p.321 ~ p.327
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Evaluation of PET Image for Fluorine-18 and Gallium-68 using Phantom in PET/CT
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Yoon Seok-Hwan
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Abstract
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The purpose of this study is to compare PET imaging performance with Fluorine-18 (18F) and Gallium-68 (68Ga) for influence of physical properties of PET tracer. Measurement were performed on a Siemens Biograph mCT64 PET/CT scanner using NEMA IEC body phantom and Flangeless Esser PET phantom containing filled with 18F and 68Ga. Emission scan duration(ESD) was set to 1, 2, 3, 4 and 5min/bed for 68Ga and 1min/bed for 18F. The PET image were evaluated in terms of contrast, spatial resolution. Under same condition, The percentage of contrast recovery measured in the phantom ranged from 16.88% to 72.56% for 68Ga and from 27.51% to 74.43% for 18F and The FWHM value to evaluate spatial resolution was 10.96 ㎜ for 68Ga and 9.19 ㎜ for 18F. For this study, 18F produces better image contrast and spatial resolution than 68Ga due to higher positron yield and lower positron energy (18F: 96.86%, 633.5 keV, 68Ga: 88.9%, 1899 keV), The physical properties of PET tracer effect on the PET image. 68Ga image applying ESD of 3, 4, 5min/bed were showed similar to 18F image with ESD of 1min/bed. This study suggests that increasing ESD for acquiring 68Ga PET image seem to be similar to 18F image.
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KEYWORD
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18F, 68Ga, PET, Contrast Recovery, FWHM
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