Table 1.
Standardized CT scanner parameters
| Scanner Make |
|||||||||
|---|---|---|---|---|---|---|---|---|---|
| Siemens | Siemens | Siemens | GE | GE | Philips | Philips | Toshiba | ||
| Scanner model | Definition (AS Plus) 128 slice | Definition (DS) 64 slice | Sensation 64 slice | VCT 64 slice/Discovery STE | Discovery CT 750HD 64 slice | Brilliance 64 slice | iCT-256 | Aquilion 64 | |
| Scan type | Spiral | Spiral single source | Spiral | Helical | Helical-standard | Spiral helix | Spiral helix | Helical | |
| Scan FOV | No selection | No selection | No selection | Large | Large | No selection | No selection | Small/medium/large | |
| Rotation time, s | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | |
| Detector configuration | (128) 64 × 0.6 | (64) 32 × 0.6 | (64) 32 × 0.6 | 64 × 0.625 | 64 × 0.625 | 64 × 0.625 | 128 × 0.625 | 64 × 0.5 | |
| Pitch | 1.0 | 1.0 | 1.0 | 0.984 | 0.984 | 0.923 | 0.993 | 0.828 | |
| kVp | 120 | 120 | 120 | 120 | 120 | 120 | 120 | 120 | |
| Dose modulation | Care dose Off | Care dose Off | Care dose Off | Auto mA Off | Auto mA Off | Dose right (ACS) Off | Dose right (ACS) Off | SURE Exp (Real EC) Off | |
| Recon 1 algorithm | B35 | B35 | B35 | Standard | Standard | B | B | Standard | |
| Recon 2 algorithm | B30 | B31 | None | Detail | Detail | YB | YB | Detail | |
| Additional image filters | No selection | No selection | No selection | No selection | IQ enhance off | Adaptive filtering off | Adaptive filtering off | No selection | |
| Thickness, mm | 0.75 | 0.75 | 0.75 | 0.625 | 0.625 | 0.67 | 0.67 | 0.5 | |
| Interval, mm | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | |
| Iterative recon (noise reduction algorithm) | Do not use IRIS | Do not use IRIS | No selection | Do not use ASIR | Do not use ASIR | Do not use iDOSE | Do not use iDOSE | No selection | |
| Scan time for 30-cm length, s | <10 | <10 | <10 | <10 | <10 | <10 | <10 | <10 | |
| Recon mode | N/A | N/A | N/A | N/A | Full | N/A | N/A | N/A | |
| Smart mA | N/A | N/A | N/A | N/A | Off | N/A | N/A | Off | |
| IQ enhance | N/A | N/A | N/A | N/A | Off | N/A | N/A | N/A | |
| Inspiratory (TLC) | Effective mAs: | Effective mAs: | Effective mAs: | mA: | mA: | mAs: | mAs: | mA: | Effective mAs: |
| Siemens = effective mAs | S: 90 | S: 85 | S: 80 | S: 145 | S: 145 | S: 105 | S: 105 | S: 145 | |
| GE = mA setting | M: 110 | M: 105 | M: 100 | M: 180 | M: 180 | M: 130 | M: 130 | M: 180 | S: 91 |
| Philips = mAs | L: 165 | L: 150 | L: 145 | L: 270 | L: 270 | L: 190 | L: 190 |
L: 270 |
M: 109 L: 164 |
| Expiratory (FRC) | Effective mAs: | Effective mAs: | Effective mAs: | mA: | mA: | mAs: | mAs: | mA: | Effective mAs: |
| Siemens = effective mAs | S: 65 | S: 60 | S: 55 | S: 100 | S: 100 | S: 70 | S: 70 | ||
| GE = mA setting | M: 65 | M: 60 | M: 55 | M: 100 | M: 100 | M: 70 | M: 70 | S: 100 | S: 61 |
| Philips = mAs | L: 90 | L: 85 | L: 80 | L: 145 | L: 145 | L: 105 | L: 105 | M: 100 L: 145 |
M: 61 L: 91 |
FOV, field of view; TLC, total lung capacity; FRC, functional residual capacity.