Quality Assurance Definition
A system of activities whose purpose is
to provide assurance that the overall
quality control job is in fact being done
effectively. The system involves a
continuing education on the adequacy
and effectiveness of the overall quality
control program and initiates corrective
measures where necessary.
Activities of the Quality
Assurance Program Include:
In-service education of personnel
responsible for radiography
Other items such as the evaluation of
Quality Control Definition
The overall system of activities, the
purpose of which is to provide a quality
product or service that meets the need
of the users. The aim of quality control
is to provide quality that is satisfactory,
adequate, dependable, and economic.
Purpose of Quality Assurance/
Provides way to minimize the dose of
radiation to patient and staff.
Allows production of a quality
Leads to decreased number of repeated
Will be responsible for doing quality
Keeping of records.
Technician will measure, plot and
Equipment needs will vary based on the
Equipment may include:
Tape measure or other measuring device
Types of Quality Control Tests
that can be done
Source-Image Distance Test
Ensures accuracy of the SID
Ensures x-ray beam is properly centered
Check function of locks to make sure working
X-ray Field Light
Make sure light on x-ray machine can be seen
with normal lights in room on.
Light Field Size
Make sure collimator dials are consistent with light
Used when collimator light is not available, verify
Locks/Cables/Overhead Crane Movement
Ensure adequate locking of crane so doesn’t “drift”
Ensure angle indicator is correct when using
angulation of x-ray tube.
View Box uniformity
Make sure light is even throughout view box
Light Field/X-ray Field Alignment
Ensures x-ray field is actually going where the
light field indicates
Screen Film Contact
Ensures that screens are securely in cassette.
Uniformity of Screen Speed
Determines if screens have lost speed through
wear and tear.
Must be performed by a professional. Should be
Assesses if unwanted fog is being added to
radiograph during processing.
Sensitometry and Densitometry
Ensures that processing of radiographs is
Tests the processing procedure.