Lecture 13

Question 1

What is the benefit of digital imaging?

Answer 1

• Image processing
• Image distribution
• Improved radiographic appearance
• More flexible with under/over exposures
• Image processing (pre and post processing- filters and contrast)
• More rapid image processing
• Dispense with wet processing

Question 2

How does indirect detection radiography work?

Answer 2

• Indirect detectors
• screen interacts with X-rays to produce light
• the flat panel interacts with light produced from the screen and produces an image formation

Question 3

How does direct detections radiography work?

Answer 3

• uses a direct detection X-ray as a line of flat panel indicators. Each element is then read out individually to produce an image (involves no screen and no light)

Question 4

Is it possible to fix a poor quality image on a digital X-ray?

Answer 4

No. If the image of of poor quality to start of with there is no way to fix it.

Question 5

Does analogue or digital have better spatial resolution?

Answer 5

Analogue has much better spatial resolution when compared to digital

Question 6

What are the two measures for image quality control on a digital machine?

Answer 6

1. Objective-assessment that uses exposure indicies (acceptable exposure range)
2. Subjective- involves doubling the image size- this involves evaluating the image for anatomy clipping and multiple dots that may indicate under-exposure

Question 7

What is the format for diagnostic imaging and communication in medicine?

Answer 7

DICOM