66
OPERATOR'S MANUAL
EN
7. 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 r
efer to chapter “Inspection and Maintenance”.
7.1. PERIODIC INSPECTIONS TO CHECK THE IMAGE
-
Acquisition of Blank image
The Blank acquisition allows optimising the scanning performance. This short procedure is compulsory and the NNT
software requires it
every two weeks. To carry out this procedure, consult NNT “Acquisition operations”.
-
Quality control by means of phantom (QA Phantom)
Image resolution (line pairs/mm)
2.5 lp/mm
Low contrast resolution
At least 2 low contrast points can be distinguished
Artefacts
In the image, there must be no artefacts such as visible
horizontal lines or halftones
Frequency of the check
Yearly
Use the optional phantom, available upon request, with the relevant instructions for use or, as an alternative, use a
dental phantom compliant with IEC 61223-3-4:2000.
The quality control consists in the execution of the standard examination on a suitable QA phantom, through an
automatic NNT software-assisted procedure. This periodic monitoring ensures the verification of the proper
functioning of the device and the validity of the results obtained.
The control is carried out by a qualified expert or by the distribution company of the X-ray device used which
performed the first installation, or by another technician authorised by the Manufacturer.
To properly perform this procedure, consult NNT “Acquisition operations” and the technical manual.
