Abstract
We aimed to determine the difference in tumor volume associated with the reconstruction model in positron-emission tomography (PET). To reduce the influence of the reconstruction model, we suggested a method to measure the tumor volume using the relative threshold method with a fixed threshold based on peak standardized uptake value (SUVpeak). The efficacy of our method was verified using 18F-2-fluoro-2-deoxy-d-glucose PET/computed tomography images of 20 patients with lung cancer. The tumor volume was determined using the relative threshold method with a fixed threshold based on the SUVpeak. The PET data were reconstructed using the ordered-subset expectation maximization (OSEM) model, the OSEM + time-of-flight (TOF) model, and the OSEM + TOF + point-spread function (PSF) model. The volume differences associated with the reconstruction algorithm (%VD) were compared. For comparison, the tumor volume was measured using the relative threshold method based on the maximum SUV (SUVmax). For the OSEM and TOF models, the mean %VD values were −0.06 ± 8.07 and −2.04 ± 4.23% for the fixed 40% threshold according to the SUVmax and the SUVpeak, respectively. The effect of our method in this case seemed to be minor. For the OSEM and PSF models, the mean %VD values were −20.41 ± 14.47 and −13.87 ± 6.59% for the fixed 40% threshold according to the SUVmax and SUVpeak, respectively. Our new method enabled the measurement of tumor volume with a fixed threshold and reduced the influence of the changes in tumor volume associated with the reconstruction model.
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Koyama, K., Mitsumoto, T., Shiraishi, T. et al. Verification of the tumor volume delineation method using a fixed threshold of peak standardized uptake value. Radiol Phys Technol 10, 311–320 (2017). https://doi.org/10.1007/s12194-017-0405-6
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DOI: https://doi.org/10.1007/s12194-017-0405-6