Radiology

Question 1

What appears more white on X-Rays?

Answer 1

Denser structures (less Xray passes through)

Question 2

What are XRs useful for?

Answer 2

Where there is strong difference in densities

Question 3

What substances (2) are commonly used for contrast studies? What do they do?

Answer 3

Barium or iodine.

Very dense, thus used to enhance soft tissue outlines

Question 4

CT scans provide superior contrast resolution with different views/ sections.
What is the limitation?

Answer 4

Not useful if tissues have very similar densities

Question 5

When is the high spatial resolution in US useful? (3)

Answer 5

MSK
Fluid collection
Solid structures in fluid

Question 6

What must be done before an MRI scan?

Answer 6

Remove iron containing material

Question 7

What is MRI good for?

Answer 7

For soft tissue of similar densities.

*Gold standard for brain scans

Question 8

Which organ does MRI not work well with?

Answer 8

Lungs (poor details)