(a) | |||||
CT acquisition settings | |||||
Scan number | 1 | 2 | 3 | 4 | 5 |
Acquisition mode | Helical | ||||
Organ characteristic | Abdomen | ||||
CARE dose 4D (mAs) modulation strength | Average | ||||
CARE kV mode | On | Semi | Semi | Semi | Semi |
CARE kV reference tube voltage (kV) | 120 | ||||
CARE kV reference mAs (mAs) | 50 | ||||
Image quality optimisation setting | Non-contrast-enhanced CT (point 3 on sliding scale) | ||||
Automatic tube voltage selection | On | Off | Off | Off | Off |
Tube voltage used(kV) | Optimal kV determined by scanner | 80 | 100 | 120 | 140 |
Tube current modulation | On | ||||
Tube rotation time (s) | 0.5 | ||||
Collimation (detector rows × mm) | 16 × 1.2 | ||||
Pitch | 0.8 | ||||
Axial scan length (cm) | 34.7 (Lungman, lungman plus fat); 22.1 (Esser, NEMA IQ) | ||||
CT reconstruction settings | |||||
Reconstruction method | Filtered backprojection | ||||
Kernel | B19f | ||||
Slice thickness (mm) | 5 | ||||
Increment (mm) | 5 | ||||
(b) | |||||
PET acquisition settings | |||||
Acquisition mode | Step-and-shoot | ||||
Time per bed (mins) | 3 | ||||
Number of bed positions | 2 (Lungman, Lungman plus fat); 1 (Esser, NEMA IQ) | ||||
Location of PET bed position | Shoulder joints down to base of liver in Lungman and Lungman plus fat (no scanning beyond axial extent of phantom); Axial extent of Esser phantom plus 3.5 cm scanning beyond phantom lid containing cylinders; axial extent of NEMA IQ phantom (scanning exactly the axial extent) | ||||
PET reconstruction settings | |||||
Matrix | 400 | ||||
Algorithm | Ultra-HD PET (time-of-flight plus point-spread-function modelling) | ||||
Attenuation correction | Yes | ||||
Scatter correction | Yes | ||||
Iterations | 2 | ||||
Subsets | 21 | ||||
Filter (type, mm) | Gaussian, 2.5 | ||||
Slice thickness (mm) | 5 |