Section 13.0
MAN 06–0017H
ZIEHM QUANTUM User’s Manual Page 198 of 220
NOTE:
The relevant radiation protection regulations of a country, local state, or regional
authority at time of installation must be observed.
13.3 VERIFY AUTOMATIC DOSE RATE CONTROL
Quantitative Method:
In accordance with CDRH and other country regulations, automatic dose rate must be checked
monthly. Power-on the C-Arm in default mode.
The control panel must display the following:
• Fluoroscopic program number one (Extremities): with patient-equivalent filter (25 mm
aluminum plus .4 mm copper) inserted in the beam.
• The Control Panel technique display values should resemble the following (actual values
may be different)
• 1/2 Dose: 67 + 2 kV / 4.5 mA + 0.4 mA (dose value mGy/min)
• 1/1 Dose: 70 + 2 kV / 5.0 mA + 0.4 mA (dose value mGy/min)
13.4 CHECKING THE USEFUL BEAM
13.4.1. INSPECTION INTERVAL
Together with the consistency test, it is necessary to check the size and centering of the useful X-
ray beam.
13.4.2. CENTERING
To determine the correct alignment of the ray beam to the center of the image intensifier and any
possible deviation, do the following:
• Angulation of C-arm by 180°, so that the X-ray generator is above and the image
intensifier is below.
• Place a reference or test object (e.g. measuring board, graduated collimator test tool)
exactly in the center of the image intensifier.
• Close the iris collimator as far as possible and initiate radiation by pressing the hand or
foot switch. The object should appear exactly in the center of the fluoroscopic image.
13.5 COLLIMATOR DIAMETER ACCURACY
The size of the collimator diameter in the image plane must not differ from the nominal image
diameter by more than 2 % of the source–image receptor distance (SID).The SID and the nominal
image diameter depend on the image intensifier size.
I.I. size SID Nominal image diameter
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