Table 1 Parameters used for protocol testing.
Parameter | GE Signa Excite | Philips Achieva | Siemens Avanto |
|---|---|---|---|
Reduction by regular protocol variation | |||
Gradient speed | on/off (flow opt.) | default/regular | normal/whisper |
Partial Echo | min (75%)/min full | on (75%)/off | asymmetry strong (77%)/off |
Bandwidth (Hz/pix) | 200, 250, 300, 350, 400 | ||
Venc (cm/s) | 120, 150, 180, 200, 300 | ||
Slice Thickness (mm) | 6, 7, 8, 9, 10 | ||
Exploratory measurements beyond the protocol | |||
Delay Td (ms) | - | 0, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0 | |
Velocity encoding | - | symmetric/asymmetric | |
Slew rate (%) & amplitude (%) | - | - | 20, 40, 60, 80, 100 |