52
OPERATOR'S MANUAL
EN
8. PERIODIC CHECKS AND MAINTENANCE
In the interest of safety and health of patients, the staff or third parties, inspections and maintenance need to be
carried out at scheduled intervals.
Period
Operator
Object
Description
Yearly
Specialised technician of
the dealer that initially
installed the device or
another
technician
authorised
by
the
Manufacturer
The X-ray device as a
whole
In order to ensure the
operating safety of the
device, it is advisable to
inspect the X-ray device in
all its parts, in order to
prevent or repair any faults
For installations in the U.S.: please refer to chapter “Inspection and Maintenance”.
8.1. PERIODIC INSPECTIONS TO CHECK THE IMAGE
8.1.1. X-RAY EMISSION QUALITY CONTROL
In order to assure adequate X-ray emission efficiency, the following parameters should be measured and checked at
least on a yearly basis by a qualified technician with proper instruments:
Parameter
Maximum deviation
from nominal value
MEASUREMENT CRITERIA
Tube peak voltage
(kV)
±5%
It should be measured with a calibrated, non-invasive kVp-meter.
Exposure time (s)
±10%
The beginning and end points of exposure time are defined at 70%
of peak radiation. They should be measured with a calibrated, non-
invasive multimeter.
Half Value Layer
[HVL] (mm)
>2.9mm @80kV
Set 80kV and measure the Air Kerma rate with additional 2.9mm
Al. filter. Repeat the measure without additional filter.
Then:
(Dose rate with +2.9mm Al filtration) / (Dose rate without added
filtration) > 0.5.
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