Imaging

Question 1

5 radiodensities (X-ray)

Answer 1

• air
• fat
• soft tissue
• bone
• metal

Question 2

ultrasound echogenicities

Answer 2

• high: hyperechoic
• low: hypoechoic
• completely black: anechoic = fluid filled, usually a blood vessel

Question 3

4 signs of OA on X-ray

Answer 3

• subchondral sclerosis
• osteophytes
• narrowing of joint space
• subchondral cysts

Question 4

diff weighting of MRI images

Answer 4

• T1: high fat content appears white, high water content appears dark
• T2: high water content appears white, high fat content appears dark

Question 5

advantages of MRI

Answer 5

• don’t involve damaging radiation
• extremely clear, detailed images of soft-tissue structures
• contrasting agent is less likely to produce an allergic reaction compared to X-Rays and CTs which use iodine-based substances