| 摘要 |
An x-ray CT system modulates x-ray tube current as a function of gantry angle to reduce the total patient dose without significantly increasing image noise. A modulation waveform is stored in a table as a function of gantry angle, and during a slice acquisition, values are periodically read from this table and employed to calculate tube current commands. Tube current is monitored and compared with the latest command to ensure the proper x-ray dose is applied. |
