Film processing and digital imaging

Question 1

Quality assurance

Answer 1

A planned and systematic set of activities which establishes and evaluates the processes required to produce a diagnostic radiograph while protecting those individuals involved from unnecessary radiation.
Activities of a QA program include:
Preventative maintenance
Quality control
Equipment calibration
In-service education
Others such as evaluation of new products

Question 2

Quality control

Answer 2

The process by which product quality is compared with predefined standards; and the action taken when nonconformance is detected.
Identifies defects for the primary purpose of correcting them.
The aim of quality control is to provide quality that is satisfactory, adequate, dependable, and economic.
Covers the integrity and function of the equipment and measures image quality

Question 3

Reasons for QA/QC

Answer 3

Minimizes the dose of radiation to patient and radiographer
Produces a quality radiograph for accurate diagnosis
Reduces overall cost per examination by decreasing the number of repeated films

Question 4

Source-image distance test

Answer 4

SID check
SID smaller = Density greater
SID larger = Density lesser

Question 5

Perpendicularity

Answer 5

If the tube head is not perpendicular to the table, then the x-ray beam will not be perpendicular to the subject and distortion of the image occurs

Question 6

Light Field/X-Ray Field Alignment – Mirror Displacement Test

Answer 6

If the mirror is displaced, then the lighted area seen on the patient is not the same area as the radiation is going.