12. Maintenance
vatech A9 (Model name: PHT-30CSS) User Manual 131
English
12.4 QA Test Procedure
Each facility shall establish a committee of individuals to be responsible for the
Radiation Safety/Quality Assurance program. For a non-hospital facility, this
committee might be composed of a dentist, an X-ray technician, an office
manager, and a service representative who is certified to perform radiological
functions by the law in the state in which the X-ray system is being used.
Each facility shall make the radiation safety/quality assurance program including
the following tests, at the frequency specified by the manufacturer or state
regulations and maintain records of the data.
For technical assistance for QA tests, contact your local VATECH service
representative.
If the test criteria are not met, contact your local VATECH service representative.
12.4.1 QA CT Number Test
Follow the CT Number Test procedure below to produce correct images and analyze
the User Phantom. Test results must be documented and maintained for at least one
year. The CT number for water should be recorded and compared each day to the
established specifications.
12.4.1.1 Setting up CT Number Phantom
1. Remove Bite and Temple Supports from the Unit.
2. Align the PHANTOM FIXING BOLTs to the PHANTOM JIG BOTTOM base line as
shown below and turn the bolts clockwise to tighten them.
3. Insert the PHANTOM JIG BOTTOM into the Chinrest and then put the PHANTOM
JIG TOP on the PHANTOM JIG BOTTOM.
PHANTOM JIG ASS’Y BOTTOM
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