Quality Assurance and radiographic errors

Question 1

Aspects of quality assurance for radiography

Answer 1

• procedures
• staff training
• x-ray equipment
• patient dose
• display equipment
• image quality

Question 2

How often should digital receptors be checked?

Answer 2

every 3 months or sooner if issue is suspected

Question 3

digital image receptor checks

Answer 3

the receptor
- visible damage
- cleanliness
image uniformity
- expose receptor to an unattenuated x ray beam and check If resulting image is uniform
image quality
- take radiograph of test object and assess resulting image as baseline

Question 4

How do collimation errors occur?

Answer 4

• incorrect assembly of receptor holder
• incorrect alignment between X-ray tube and receptor holder
• incorrect orientation of the rectangular collimator

Question 5

Parallax localisation options for horizontal tube shift

Answer 5

2 pericpicals
2 bitewings
2 oblique occlusals

Question 6

parallax localisation options for vertical tube shift

Answer 6

panoramic and oblique occlusal
panoramic and lower periapical

Question 7

features of a ghost image

Answer 7

• ghost image is distorted and appears larger than actual object projected
• often not at the same height
• appears translucent and shadow like
• lacks clearly defined edges and details