5. Measurements with the Barracuda System
Radiography
Barracuda & QABrowser Reference Manual
2012-10/4.3A
120
With the initial exposure the total filtration is displayed (6.8 mm Al) before the kVp is
displayed. Then the measured kVp is shown (117.0 kV) and the estimated total
filtration and HVL are shown as supplementary information. The HVL is calculated to
be 6.42 mm Al. The set kV was changed and the Barracuda measured 102.6 kV. The
HVL is calculated at 5.70 mm for this kV. The set kV is changed again and a third
exposure is made. The kV is measured to be 83.53 kV and the HVL is calculated to be
4.69 mm Al. Notice that all three measurements of total filtration were 6.8 mm Al.
Cine/Pulsed Radiography5.4
The cine/pulsed exposures application is aimed to
check Cat-Lab and cine X-ray units that are able to
deliver high output short duration X-ray pulses (in the
millisecond region) and acquire each individual
"pulse" as an X-ray image. The images are used to
study dynamic structures in the patient body, often in
combination with the injection of a contrast medium
during the investigation. The same type of X-ray
system also can be used for pulsed fluoroscopy
where the X-ray output is much lower. Therefore,
depending on type of acquisition mode, it may be
better to select the "pulsed fluoroscopy"
measurement type for the Barracuda. Please consult
the next section of the manual if this is the case.
For under-table cine measurement turn the MPD upside-down. An optional detector
rod is available that can be used to put the detector in position on the image intensifier
without risk for hazardous X-ray exposure when monitoring.
The Position Check should be used to
confirm the position. To be able to
protect the image intensifier from the
relative high output cine pulses a lead
apron can be placed over the image
intensifier input screen. The Barracuda
automatically measures the number of
pulses based on information from the
radiation waveform. It uses a 50 % trig
level based on the maximum signal
level.
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