Fluke Biomedical TNT 12000 - Manual (Page 122)

TNT 12000
Users Manual
E-2
HF (High Frequency)
Exposure time in milliseconds is calculated between the 90 % points on the rising and
falling edges of the kV waveform.
The Detector measures average kV on the peaks in the central 80 % of the kV waveform.
It measures Maximum kV and PPV on the complete waveform.
Mammo Waveform Analysis
In the Mammographic mode, kV, dose, and exposure time measurements are effected by
automatic waveform analysis as follows:
With Scout or Sample Exposure or HTC Grid (Lorad)
The Detector measures Average kVp on the central 80 % of the last kV waveform after
the scout exposure or the last HTC grid pause. It measures Maximum kV and PPV on the
complete waveform after the scout exposure or the last HTC grid pause.
Exposure time in milliseconds is calculated between the 90 % points on the rising and
falling edges of the kV waveform after the scout exposure, but including the HTC grid
reset time.
Exposure is measured from the start of the exposure to the end of exposure, and includes
the scout exposure.
Without Scount Exposure
The Detector measures average kVp on the pulses in the central 80 % of the kV
waveform. It measures Maximum kV and PPV on the complete waveform.
Exposure time in milliseconds is calculated between the 90 % points on the rising and
falling edges of the kV waveform. Exposure is measured from the start of the exposure to
the end of exposure.
Fluoro Waveform Analysis
In the Fluoroscopic mode, waveform analysis of exposure time and dose measurements is
done as follows:
Continuous Fluoro
The Detector measures elapsed time and accumulated dose from the moment x-rays are
sensed until they stop. It measures KV from one second samples while the x-ray beam is
on. The user can set the unit of measure for Dose Rate as Dose ( R or Gy) per second,
minute, or hour.
Pulsed Fluoro
The Detector measures elapsed time and accumulated dose from the moment x-rays are
sensed until they stop. The average pulse width and pulse rate are calculated from each
one-second sample. It measures KV from one second samples while the x-ray beam is on.
The user can set the unit of measure for Dose Rate as Dose ( R or Gy) per second, minute,
hour, or pulse.