RT Journal Article
SR Electronic
T1 High Spatial Resolution Digital Positron Emission Tomography Images With Dedicated Source-to-background Algorithm for Radiotherapy Planning
JF Anticancer Research
JO Anticancer Res
FD International Institute of Anticancer Research
SP 2567
OP 2572
DO 10.21873/anticanres.14227
VO 40
IS 5
A1 TAKAHIRO WATAKABE
A1 RYO TOYA
A1 TETSUO SAITO
A1 TOMOHIKO MATSUYAMA
A1 SHINYA SHIRAISHI
A1 YUDAI KAI
A1 YOSHINOBU SHIMOHIGASHI
A1 NATSUO OYA
YR 2020
UL http://ar.iiarjournals.org/content/40/5/2567.abstract
AB Background/Aim: To evaluate the utility of high spatial resolution digital positron emission tomography images with the source-to-background ratio (SBR) algorithm for gross tumour volume (GTV) delineation. Materials and Methods: The bowl and spheres (10-37 mm) were filled with fluoro-2-deoxy-D-glucose to achieve 4-16 times background radioactivity. The images were reconstructed using three isotropic voxel sizes. The SBR and percentage threshold (TH) to SUVmax were calculated. The plots between SBR and TH were fitted using a regression equation. The contoured volumes (CVs) of the spheres were calculated by applying TH. Results: TH was 38.6+75.0/SBR for 4 mm voxel size; 39.6+37.0/SBR for 2 mm; and 38.8+35.2/SBR for 1 mm. The mean relative errors between CV and true volume for 4, 2, and 1 mm voxel sizes were 15%, 7%, and 7%, respectively. Conclusion: The present technique is useful for GTV delineation with reduced contouring error.