Radiology

Question 1

How does an x-ray work?

Answer 1

High energy electromagnetic radiation pointed at body in front of translucent screen, dense tissues absorb the energy, whilst others allow the radiation to pass through. The more radiation that passes through the blacker the screen.

Question 2

Most to least radiolucent (x-ray)

Answer 2

air, fat, water, most tissues, spongy bone, compact bone

Question 3

Advantages to x-ray

Answer 3

ideal for overview examinations, good for bone, contrast agents can be used for specific regions in particular

Question 4

Disadvantages to x-ray

Answer 4

carcinogenic, superimposes 3d to 2d, pregnancy

Question 5

CT

Answer 5

distinguishes soft tissue damage, advantage 3dish, cheap fast, disadvantage; high radiation not good for joints

Question 6

MRI

Answer 6

water content, good for soft tissues can create a 3d replica, no radiation exposure, faster than pet. bad high magnetic field means magnetic implants can malfunction, long, not suitable for trauma situations, patient movement

Question 7

ultrasound

Answer 7

safe, non-invasive,quick, cheap. bad:low resolution, no hard tissue penetration, user dependant