Figure 1.
The respiratory cycle was divided into 10 phases based on motion amplitude. The 10 respiratory phases were labeled T5%, T15%, … T95%, with the T5% phase corresponding approximately to the normal end-inspiration and T55% to the end-expiration for both CT and PET. 4D-CT was used for attenuation correction of 4D-PET on a phase-by-phase basis so that they would match each other spatially.
Figure 2.
Sagittal views of PET and CT fusion images across the ten phases of a complete respiration cycle.
One example for 4D-PET/CT and 4D-PET ICT/ICT are shown from patient 3.
Figure 3.
A bar graph showing the mean tumor volume from 4D-PET and 4D-PETICT for each patient.
The percentage difference between 4D-PET and 4D-PETICT is indicated on the top of each bar.
Figure 4.
A bar graph representing the SUVmax from 4D-PET and 4D-PETICT for each patient.
The percentage difference between 4D-PET and 4D-PETICT is indicated on the top of each bar.