Table II.
Summary of three-dimensional (3D) imaging protocols for the mobile C-arm in this work. Clinical protocols are in white, and custom protocols are in gray. The mAs/view and mAs total values are set by automatic exposure control (AEC) (with values shown for 16 and 32 cm diameter head and body acrylic cylindrical phantoms).
| Protocols | Tube voltage (kV) | Number of projections | Scan time (s) | Angular step (Δθ) | Pixel binning | Tube output (mAs/view) | Tube output (total) (mAs) |
|---|---|---|---|---|---|---|---|
| 16 cm cylindrical phantom (head) | |||||||
| Low dose (L) | 110 | 100 | 30 | 2° | 2 × 2 | 0.05 | 5 |
| Standard (S) | 110 | 200 | 30 | 1° | 2 × 2 | 0.05 | 10 |
| High quality (H) | 110 | 400 | 30 | 0.5° | 2 × 2 | 0.08 | 32 |
| Extra power obese (O) | 110 | 400 | 60 | 0.5° | 2 × 2 | 0.08 | 32 |
| Custom head 1 | 110 | 100 | 30 | 2° | 2 × 2 | 0.57 | 57 |
| Custom head 2 | 110 | 200 | 30 | 1° | 2 × 2 | 0.57 | 114 |
| Custom head 3 | 110 | 400 | 30 | 0.5° | 2 × 2 | 0.68 | 272 |
| 32 cm cylindrical phantom (body) | |||||||
| Custom body 1 | 110 | 100 | 30 | 2° | 2 × 2 | 0.16 | 16 |
| Custom body 2 | 110 | 200 | 30 | 1° | 2 × 2 | 0.16 | 32 |
| Custom body 3 | 110 | 400 | 30 | 0.5° | 2 × 2 | 0.22 | 88 |
| Low dose (L) | 110 | 100 | 30 | 2° | 2 × 2 | 1.01 | 101 |
| Standard (S) | 110 | 200 | 30 | 1° | 2 × 2 | 1.02 | 204 |
| High quality (H) | 110 | 400 | 30 | 0.5° | 2 × 2 | 1.47 | 588 |
| Extra power obese (O) | 110 | 400 | 60 | 0.5° | 2 × 2 | 1.65 | 660 |