Dynamic scans of 3 min with 35 2 s frames, 6 5 s frames, and 8 10 s frames were acquired after injection of 50 mCi [O] water in saline or inhalation of 60 mCi of [O] oxygen in room air, respectively, for CBF and CMRO2 measurements [ 12, 13].
In all slices of the dynamic scans of the two defined lung regions, the entire lung was chosen as the region of interest (ROI) by drawing the external boundaries of the lungs inside the ribs and the internal boundaries along the mediastinal organs.
To achieve high performance and reliability in video streaming over wireless local area networks (WLANs), one must jointly consider both optimized association to access points (APs) and handover management based on dynamic scanning of alternate APs.
In the case of using a PET camera without list mode to acquire phantom data as the four PET drugs in Table 1, the Hoffman phantom data were acquired with a dynamic scan of four frames (135, 120, 455, and 1090 s).
A dynamic scan of the hepatic region, lasting 25 min (6 × 60 s, 3 × 180 s, and 2 × 300 s), was done to assess the radioactivity concentration as a function of time of the liver hotspots on the axial field of view.
The dose exposure to the patient is strictly related to the acquisition time required for the dynamic scanning of the volume being analysed.
The acquisition time for a single scan was 104 s; a dynamic scan of 24 images was acquired with 30-s time intervals between each image (total acquisition time 53 min).
It consisted of several acquisition steps: (i) an early dynamic scan of the pelvis, (ii) an early static scan of the pelvis, (iii) an early whole-body scan, (iv) delayed static scan of the pelvis, and (v) delayed whole-body scan.
At an average of 90 min, after the start of the study, [F]FDG (mean 189 MBq, 147 218 MBq) was injected over 15 s and a dynamic scan of the upper abdominal region was started at 80 min (frames 5 × 180 s) followed by a similar scan of the lower abdominal region at 100 min and the femoral region at 130 min (3 × 300 s) (Fig. 1a).
Thus, the acquisition of dynamic scans for the evaluation of contrast enhancement over time within the tumour or tumour motion prior to radiotherapy generates a high number of images.
These regions were then projected to the dynamic scans to obtain concentrations of C-11 vs. time, which were used to calculate the distribution volumes (DV) using a graphical analysis technique for reversible systems that does not require arterial blood sampling [21].
