Fig. 4
From: CT-free quantitative SPECT for automatic evaluation of %thyroid uptake based on deep-learning
CT-free quantitative thyroid SPECT in a patient with thyroiditis (F/57). A planar scan shows a faint thyroid uptake. Primary emission SPECT and scattering SPECT were used for μ-map generation. Subsequently, the synthetic μ-map and primary emission SPECT were used for automatic thyroid segmentation. Yellow and red indicate true and false positives of the automatic thyroid segmentation, respectively, compared with manual segmentation. The %thyroid uptake by CT-free SPECT was 0.11%, whereas that by conventional SPECT/CT was 0.08%, consistent with the clinical condition of thyroiditis and faint uptake in the planar scan. The reported normal reference range was 0.78 ± 0.5%