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The image quality, lesion detectability, and acquisition time of F-FDG total-body PET/CT in oncological patients. | LitMetric

Purpose: The purpose was to investigate the effects of short acquisition time on the image quality and the lesion detectability of oncological F-FDG total-body PET/CT.

Methods: Nineteen oncological patients (6/13 women/men, age 65.6 ± 9.4 years) underwent total-body PET/CT on uEXPLORER scanner using 3D list mode. The administration of F-FDG was weight-based (4.4 MBq/kg). The acquisition time was 900 s, and PET data were reconstructed into 900-, 180-, 120-, 60-, 30-, and 18-s duration groups. The subjective PET image quality was scored using a 5-point scale (5, excellent; 1, poor) in 3 perspectives: overall quality, noise, and lesion conspicuity. The objective image quality was evaluated by SUV and standard deviation (SD) of the liver, SUV of the tumor, and tumor-to-background ratio (TBR). The lesion detectability was the percentage of identifiable lesions in the groups of 180 to 18 s using the group 900 s as reference.

Results: Our results showed that sufficient and acceptable subjective image quality could be achieved with 60- and 30-s groups, and good image quality scores were given to 180- and 120-s groups without significant difference. For shortened acquisition time, SD was increased, while SUV of tumor and TBR remained unchanged. The lesion detectability was decreased with shorter acquisition time, but the detection performance could be maintained until the 60-s group compared with the 900-s group, although the image quality degraded.

Conclusion: The total-body PET/CT can significantly shorten the acquisition time with maintained lesion detectability and image quality.

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Source
http://dx.doi.org/10.1007/s00259-020-04823-wDOI Listing

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