Effects of Reusing Baseline Volumes of Interest by Applying (Non-)Rigid Image Registration on Positron Emission Tomography Response Assessments
Figure 9
Coronal images of a patient with a liver metastasis that showed an increased metabolically active tumour volume.
Top row: baseline (left) and late response (right) PET/CT images. Bottom row: volumes of interest (shown in red) projected onto the baseline (first image) and late response scans (other images) that were obtained using (from left to right): A50 defined on baseline scan, A50 defined on late response scan, and local rigid PET, non-rigid PET and non-rigid CTPET image registration. All images are shown using the same colour scales. Abbreviations: SUV, standardized uptake values; HU, hounsfield units; A50, 3 dimensional (semi-)automatic isocontour method at 50% of the maximum pixel value that corrects for local background.