Evaluation Of Radiographs 🩻

Question 1

What identification details must be included on a radiograph?

Answer 1

• Owner’s name
• Animal’s name
• Date
• Left / Right marker

Question 2

What details should be included for a hip/elbow score?

Answer 2

Kennel club number
Microchip number
Date
Left/right marker
No animal/owner name

Question 3

What causes film fogging?

Answer 3

Scattered radiation

Film fogging is often a result of unintended exposure to radiation.

Question 4

What can cause a blurred image in radiography?

Answer 4

• Movement of patient
• Movement of tube head or cassette

Blurring can significantly affect the diagnostic quality of the image.

Question 5

What can lead to coarse lines in grid faults?

Answer 5

• Non-movement of moving grid
• Wrong FFD for focussed grid

FFD stands for Focus Film Distance, which is critical for accurate imaging.

Question 6

What is vignetting in radiography?

Answer 6

• Wrong FFD for grid
• Poor centring over grid
• Angling of primary beam
• Focussed grid used upside down

Vignetting results in peripheral underexposure, affecting image quality.

Question 7

What are Moiré artefacts?

Answer 7

Alternating light and dark bands appearing on the image

Moiré artefacts occur when stationary grids are used for CR and DDR due to interference.

Question 8

What causes Überschwinger artefacts?

Answer 8

Processing errors

These artefacts are especially common with orthopaedic implants, creating a halo effect.

Question 9

What issue can dirt on CR readers cause?

Answer 9

Thin white lines to appear on the radiograph

Dirty rollers or light guides can obstruct light emission and detection.

Question 10

What is the role of a lookup table in imaging?

Answer 10

It details how bright the pixels should be in relation to the amount of phosphor excited

Correct algorithm selection is crucial for optimising images for specific body areas.