Four-dimensional (4D) PET/CT imaging of the thorax
Patient setup during 4D PET/Ct acquisition. The figure also shows the RPM infrared camera (top right corner) used to track the infrared reflectors placed on the diaphragm of the patient.
Distance between PET and CT lesions in both clinical and 4D setup.
Percent difference in the lesion volumes, between clinical and 4D PET/CT acquisitions, measured in both CT and PET modalities (a). A negative (positive) percent difference refers to a reduction (increase) in the tumor volume. 4D-PET lesions volumes and are compared in (b).
Percent difference in between 4D PET/CT and clinical setup based measurements (a). Percent difference in between 4D PET/CT and 4D-PET w/clinical-CTAC based measurements (b). The maximum within all 4D-PET bins, which were corrected for attenuation using 4D-CT images at matching breathing phase, was considered in this comparison.
Transaxial, fused PET/CT slice, through patient #4 lesion as it appears in the nongated acquisition (a), and measured in the 4D PET/CT study (b).
Comparison of maximum respiratory motion amplitudes, for each patient, in both 4D-PET and 4D-CT.
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