Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

BDS3 - radiology > Fault Analysis and Quality Insurance > Flashcards

Fault Analysis and Quality Insurance Flashcards

1
Q

what is the purpose of quality assurance in dental radiology

A
  • ensure consistently adequate diagnostic information
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

what aspects of radiography does QA programmes cover

A
  • procedures
  • staff training
  • x-ray equipment
  • patient dose
  • image processing
  • display equipment
  • image quality
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

why are digital receptors so often damaged

A
  • because they are reusable and are used so often
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

how often should Digital receptors be checked

A
  • every 3 months
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

what needs to be checked for digital receptors

A
  • receptor itself
  • image uniformly
  • image quality
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

how is the receptor of the digital receptor checked

A
  • check for visible damage to casing/wiring

- check if clean = no congealed disinfectant/saliva

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

how is image uniformity of digital receptors checked

A
  • expose receptor to an unattenuated x-ray beam and check if resulting image is uniform
  • should show a consistent shade of grey across whole image
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

how is image quality of digital receptor checked

A
  • take a radiograph of a test object and assess the resulting image against a baseline
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

how does scratches show up on phosphor plate

A
  • white lines across image

- can be very thin and fine or large

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

how does cracking (from flexing) show up on phosphor plates

A
  • network of fine lines
  • start to get creases if been bent, and cracks can start to form along it
  • like spider webbing
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

how does delamination show up on phosphor plates

A
  • white areas around the edge
  • separation of phosphor layer from base plate
  • only around edge of image
  • starts to arise from peeling away of phosphor layer either from saliva of being damaged
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

how does damage often appear as on solid-state sensors

A
  • white squares/striaght lines

- don’t get many scratches as encased in strong plastic

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

how does damage often appear as on film receptor

A
  • black marks due to sensitisation of radiographic emulsion
  • however, may appear white if emulsion is scraped off
  • appears black because when damage image the silver halide crystals in emulsion get sensitised (by heat and pressure)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

what often causes marks on receptors

A
  • nail marks, bite marks, fingerprints
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

how can delamination occur

A
  • from image being wet and then drying causing phosphor layer to peel away
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

what is step wedge technique of QA receptor image quality

A
  • self-made or provided by manufacturer
  • small wooden spatula and wrap lead foil round it in different thicknesses
  • when expose to radiograph = put receptor underneath
  • should get image down below
17
Q

what should the baseline step wedge show

A
  • 6 differentiated steps
18
Q

how often should step wedge be carried out

A
  • regularly = every morning
19
Q

why do we need to be more careful doing film radiographs

A
  • more potential sources of error as need to process them
20
Q

what does QA of clinical image quality include

A
  • image quality rating
  • image quality analysis
  • reject analysis
21
Q

what is image quality rating

A
  • grading each image
22
Q

what does image quality analysis involve

A
  • reviewing images to calculate;ate ‘success rate’ and identify any trends for suboptimal images
  • carried out periodically = every 4 months you review the last 150 images
23
Q

what does reject analysis involve

A
  • recording and analysing each unacceptable image
24
Q

what does diagnostically acceptable mean

A
  • no errors or minimal erros
  • sufficient image quality to answer the clinical question
  • in digital imaging = not less than 95%
  • film imaging = no less than 90%
25
Q

what does diagnostically unacceptable mean

A
  • errors in patient preparation, exposure, positioning
  • render image diagnostically unacceptable
  • digital imaging = no greater than 5%
  • film imaging = no greater than 10%
26
Q

what was the previous QA system for image quality

A
  • 1 = excellent
  • 2 = diagnostically acceptable
  • 3 = unacceptable
  • was replaced in 2020 but you still may see clinicians using it
27
Q

how can you determine whether or not an image is diagnostically acceptable or not

A
  • need to know what image is supposed to show
  • which tooth/teeth
  • what parts of tooth/teeth
  • what other structures
  • what extent of pathology
28
Q

what is the diagnostically acceptable positioning factors for bitewing radiographs

A
  • show denture crowns of upper and lower teeth
  • include distal aspect of fore-standing posterior tooth, and mesial aspect of last-standing tooth = may need >1 radiograph
  • every proximal surface shown at least once without overlap
29
Q

what is the diagnostically acceptable positioning factors for periapical radiograph

A
  • shows entire root
  • shows periapical bone
  • shows crown
30
Q

what does fault analysis involve

A
  • identifying and explaining faults so that they can be remedied
31
Q

what are potential faults that can be visible on image

A
  • too dark or pale
  • inadequate contrast
  • unsharp
  • distorted
  • over-collimated
  • receptor marks/damage
32
Q

what are reasons for potential faults

A
  • incorrect assembly of receptor holding
  • incorrect alignment between X-ray tube and receptor holder
  • incorrect orientation of rectangular collimator
  • incorrect image radiodensity
33
Q

what can incorrect assembly of receptor holder cause

A
  • cone cutting

- means image is completely non-diagnostic

34
Q

what happens if radiodensity is not goof

A
  • image can be too dark or too light

- hard to see any proper detail

35
Q

what are potential causes of incorrect radiodensity

A
  • exposure factors
  • developing factors = only affects film as don’t develop digital
  • viewing factors
36
Q

what does exposure duration depend on

A
  • directly relates to dose
37
Q

what teeth need more radiation

A
  • molars need more than incisors

BDS3 - radiology (19 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions