Lecture 23

Question 1

What are the two contrast media types?

Answer 1

Positive (looks black) eg barium, iodine

Negative (looks white) water, air, CO2

Question 2

Ideal contrast?

Answer 2

Low osmolality and viscosity

High water solubility

Safe

Heat and chemical stability

Cost effective

Question 3

Typical contrast half life?

Answer 3

30-60 mins

Question 4

Contrast side effects?

Answer 4

Endothelial damage

Vasodilation

Vascular pain

Question 5

What projection is best to see true heart size?

Answer 5

PA

Question 6

Difference between proximal and distal?

Answer 6

Proximal close to centre of body, distal further from body centre

Question 7

What body parts are particularly sensitive to radiation?

Answer 7

Lens of eye, gonads and thyroid

Question 8

What is angiography?

Answer 8

Where arteries are injected with an x ray dye

Question 9

What is diffusion imaging?

Answer 9

MRI where water movement is looked at. Can show up things a normal MRI wouldn’t

Question 10

What is MR spectroscopy?

Answer 10

Added to MRI to see ions and protons. Can be used to measure chemical metabolism of suspected tumour