Table 1.
The data acquisition and image reconstruction parameters for the clinical protocols in RFX1 kVCT and Philips CT simulator for phantom and patients. BLM = Body/Low dose/Medium pitch; BMM = Body/Medium dose/Medium pitch; BHM = Body/High dose/Medium pitch; BHS = Body/High dose/Slow pitch.
|
RFX1 |
CT simulator |
||||||
|---|---|---|---|---|---|---|---|
| Clinical protocol | BLM | BMM | BHM | BHS | Neck | SBRT abdomen | SBRT lung |
| X-ray collimation | 16x1.25 | 16x0.75 | 16x1.5 | 16x1.5 | |||
| kVp | 120 | 120 | |||||
| Effective mAs/mA | 200/100 | 300/150 | 600/300 | 600/133 | 150/163 | 303/328 | 334/362 |
| Tube current modulation | N/A | DoseRight Index 21 | |||||
| CTDIvol(mGy) | 16.3 | 24.7 | 49.0 | 48.9 | 9.9* | 18.0* | 19.7* |
| Pitch | 0.5 | 0.222 | 0.813 | ||||
| Rotation time (s) | 1 | 0.75 | |||||
| FOV(mm) | 500 | 500 | 700 | 700 | |||
| Slice Thickness (mm) | 1.25 | 3 | 2 | 2 | |||
| Reconstruction algorithm | FDK | iDose4 | |||||
| Kernel | Standard | B/C/YA† | C | ||||
* The computed tomography dose index-volume (CTDIvol) values listed here are imaging dose specifically for the simulation CT scan of the phantom and the two example patients shown in this paper later.
† B: Smoothed, but sharper and noisier than A. Recommended for CTA, routine abdomen, and pelvis; C: Sharper, creates relatively low-noise images. Recommended for CTA, routine abdomen, and pelvis to get slightly higher sharpness than with Filter B; YA: Sharper and noisier. Recommended for reconstruction of sinuses, facial bones, dental, etc. The thinner the axial slices the sharper the axial, 2D and 3D images. (cited from Philips CT simulator user manual).