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KMID : 1148920200540050233
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Nuclear Medicine and Molecular Imaging
2020 Volume.54 No. 5 p.233 ~ p.240
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Comparison of Image Quality and Semi-quantitative Measurements with Digital PET/CT and Standard PET/CT from Different Vendors
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Kim Sung-Hoon
Song Bong-Il
Kim Hae-Won
Won Kyoung-Sook
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Abstract
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Purpose: This study aimed to evaluate the concordance and equivalence of results between the newly acquired digital PET/CT(dPET) and the standard PET/CT (sPET) to investigate possible differences in visual and semi-quantitative analyses.
Methods: A total of 30 participants were enrolled and underwent a single 18F-FDG injection followed by dual PET/CT scans, by a dPET scan, and immediately after by the sPET scan or vice versa. Two readers reviewed overall image quality using a 5-point scale and counted the number of suggestive 18F-FDG avid lesions. The SUV values were measured in the background organs and in hypermetabolic target lesions. Additionally, we objectively evaluated image quality using the liver signal-to-noise ratio (SNR).
Results: The dPET identified 4 additional 18F-FDG avid lesions in 3 of 30 participants with improved visual image quality. The standard deviations of SUV of the background organs were significantly lower with DigitalPET than with sPET, and dPET could acquire images with better SNR (11.13?±?2.01 vs. 8.71?±?1.32, P?
Conclusions: The dPET provides improved image quality and lesion detectability than the sPET. The semi-quantitative values of the two PET/CT systems of different vendors are comparable. This pilot study will be an important basis for possible interchangeable use of either system in clinical practice.
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KEYWORD
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Digital PET, PET/CT, 18F-FDG, SiPM, Silicon photomultiplier, Image quality
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