Fluke Biomedical 07-649 - Manual (Page 9)

Operation
Maximum Fluoroscopy Exposure Rate Data(With Copper and Lead)
2
2-3
Set the electrometer selector switch to the "Exposure Rate" mode. Without making any changes in the
standard patient techniques, with the phantom and MDH probe properly positioned, and the beam
collimated to the four markings on the phantom, place the 1 mm sheet of copper and the lead sheet on
top of the phantom, select the standard mode of operation, and make an exposure of at least 15-second
duration. Record this exposure rate as Fluoroscopic Maximum Exposure Rate #1. Record the selected
kVp as Fluoroscopic Maximum kVp #1. If the unit has an mA indicator, read and record the mA value
during the 15-second exposure as Fluoroscopic Maximum mA #1. Reset the MDH to zero and repeat the
15-second exposure and record the values for Fluoroscopic Maximum Exposure Rate #2, Fluoroscopic
Maximum kVp #2, and Fluoroscopic Maximum mA #2, respectively.
2.7 Maximum High Level Fluoroscopy Exposure Rate Data
(With Copper and Lead)
The following measurements are to be made only
on those systems that have the High Level option.
Do not make this measurement for Manual
systems.
Set the electrometer selector switch to the "Exposure Rate" mode. Without making any changes in the
standard patient techniques, with the phantom and MDH probe properly positioned, the beam collimated
to the four markings on the phantom and the 1 mm sheet of copper and the lead sheet on top of the
phantom, place the system in the High Level mode and make an exposure of at least 15-second duration.
Record this exposure rate as High Level Maximum Exposure Rate #1. Record the selected kVp as High
Level Maximum kVp #1. If the unit has an mA indicator, read and record the mA value during the 15-
second exposure as High Level Maximum mA #1. Reset the MDH to zero and repeat the 15-second
exposure and record the values for High Level Maximum Exposure Rate #2, High Level Maximum kVp
#2, and High Level Maximum mA #2, respectively.
2.8 Film Recording
Remove the copper and lead sheets from the top of the phantom.
Raise the image intensifier housing to allow adequate space for the compression cone to come into the
field during film recording procedures.
If the facility uses film recording as a part of the upper GI examination, record the selected technique
factors (kVp, mA, mAs and time). Using the procedure below, measure and record the exposure, time,
and obtain a film. If the facility uses both spot and photospot, do your recording and measurements for
the spot film system only.
Select the (four-on-one) mode for all film-recording measurements.
Spot or Photospot Film - Exposure and Time
Place a loaded spot film cassette in the unit and, without making any changes in the standard patient
techniques, with the phantom and probe properly positioned and the beam collimated to the four markings
on the phantom, take a spot or photospot film. Record the exposure as Film Exposure #1. Do not record
this initializing time. The processed film should be retained, the optical density determined, and the
radiograph sent along with the other data.
NOTE