Dose Rate; Kv/Kvp - Fluke Biomedical RaySafe Xi 8201011 User Manual

RaySafe Xi User Manual – Measurement definitions

DOSE RATE

The RaySafe Xi calculates dose rate as dose/exposure time if the exposure time is less than 6 seconds.
After an exposure longer than 6 seconds, a dose rate value recorded approximately 2 seconds before end trig
will be displayed.
Figure 3. Pulsed fluoroscopy

kV/kVp

The RaySafe Xi calculates kVp on the R/F high sensor if the signal level is high enough, otherwise kV average
will be displayed. If no kVp value is displayed, try decreasing the FDD or increasing mA.
kVp is calculated within the kVp measuring window. The kVp measuring window begins after Trig delay and kVp
delay and is approximately 160 ms wide.
If the exposure time is less than 6 seconds, kV average is the integrated average of the kV values during the
whole measurement.
After an exposure longer than 6 seconds, a kV value recorded approximately 2 seconds before end trig will be
displayed.
After the exposure, kV (or kVp if available) is displayed and a waveform is transmitted to the RaySafe Xi view.
The RaySafe Xi view also gives a possibility to increase the length of the waveform window.
kVp matches kV on high frequency or DC like waveforms. If there is a ripple on the waveform, a kV value will be
lower than kVp.
35