Quality Control of X-ray Producing Equiptment

Question 1

Quality assurance

Answer 1

Complete program in a radiology department that addresses all aspects of quality including customer service, image interpretation, accuracy of diagnostics, and distribution of radiologists’ reports

Question 2

Quality Control

Answer 2

Program that specificially addresses the safe and reliable operation of equiptment

Question 3

Testing of filtration-beam quality

Answer 3

Tested using a digital dosimeter; half value measurement is required

Question 4

Collimator guidelines

Answer 4

Must be accurate within 2% of SID

Question 5

Effective focal-spot size guidelines

Answer 5

Should be within 50% of size stated in equiptment specifications; measured by using slit camera, pinhole camera, or star test pattern

Question 6

kVp guidelines

Answer 6

Must be accurate to within 4 kVp of that chosen

Question 7

Exposure linearity guideline

Answer 7

Various mA-time combinations for a given mAs are checked; adjacent mA stations must be within 10% of one another

Question 8

Exposure reproducibility guidelines

Answer 8

Tests kVp, mA, and time in succession exposures; variation in measured radiation intensity should not be more than 5%

Question 9

AEC

Answer 9

Tested to verify reproducibility of exposure, with phantoms used to simulate variations in patient thickness

Question 10

Fluoroscopy exposure rate guideline

Answer 10

Entrance of skin dose should not be more than 5 rads per minute