Xstrahl 150 - Quality Assurance; Intended Function (of Equipment)

150_OPMAN_GB Version 10 © Xstrahl Ltd. All Rights Reserved
15/01/2020
v
Quality Assurance
The Xstrahl 150 defines the exposure in time and does not measure
the output of the X-Ray tube for each exposure conducted. The
output of each clinical energy needs to be measured during the
acceptance of the unit and schedule in the daily quality assurance
conducted on the machine.
The IPEM report 81, kilo voltage X-Ray units recommends that the
following quality control checks are conducted on superficial
systems
Table 1: Recommended Quality Control Checks
a
Recommended Quality Control Checks
b
Test Frequency
Tolerance
Daily
Output constancy check
± 5% If the daily output
constancy check
varies by more than
±5% from the previous
monthly output
calibration, an
investigation should be
performed. This should
include at least a
measurement of HVL.
Interlocks and warnings
Mechanical fixtures
Filter interlock
Weekly
(or following
repair)
Filter interlock
Monthly (or
following
repair
Output measurement
± 3%
Timer accuracy
± 0.01 min.
Filter interlocks
HVL constancy
± 10%
Annually (or
following
repair
Field uniformity
± 2%
Half value layer
Focal spot alignment
± 10%
a. Where no quantitative action level is indicated, the assessment is
subjective or based on a yes/no decision.
b. Refer to IPEM (Institute of Physics and Engineering Medicine) report 81
for further details on recommended quality assurance checks
Intended Function (of
equipment)
Xstrahl’s range of superficial and orthovoltage X-Ray Therapy
Systems are intended to assist in the delivery of radiation to a
defined target area whilst sparing surrounding normal tissue.