Evaluation of Images and Storage

Question 1

Advantages of taking a conscious image

Answer 1

• Some patient may be too unwell for gA
• Quick
• No recovery time

Question 2

Disadvantages of taking a conscious image

Answer 2

• Movement blur
• Stress
• Behaviour
• Limited use of restraint (sandbags only, no ties)

Question 3

Restraint (Sedated)

Answer 3

• Use of sandbags
• Reduced resistance in positioning
• Reduced stress

Question 4

Restraint (General Anaesthesia)

Answer 4

• highest degree of muscle relaxation
• Best for BVA hip/elbow scoring
• Can use any restraint

Question 5

What causes underexposure

Answer 5

Insufficient photons reaching detectors

Question 6

Image quality- Underexposure

Answer 6

• Reduced contrast
• System unable to differentiate between background and electronic noise

Question 7

Image quality- Overexposure

Answer 7

Appears as an excessive blackening of the film

Question 8

How do we alter underxpousre issues?

Answer 8

increase kV by 10-15%

Question 9

How do we alter overexposure issues?

Answer 9

decrease kV by 10-15%

Question 10

Moire Artefact

Answer 10

Alternating light and dark bands across an image due to interference between grid lines and monitor screens

Question 11

Uberschwinger artefact

Answer 11

Processing error causing excessive pixel enhancement

Question 12

What is the Digital Imaging Communication in Medicines (DICOM) do?

Answer 12

Allows transfer between various practice management systems

Question 13

What does Picture Archiving and Communication Systems (PACS) do?

Answer 13

Used to store, retrieve and share images produced by various modalities