ANAT Y1 S2: Imaging Principles

Question 1

5 radiodensities (X-ray/plain film/radiograph AND CT)

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

how to orient yourself with CT/MRI in all 3 planes

Answer 5

• axial: view as tho you’re standing at the Pt’s feet and looking up
• sagittal: view as tho you’re standing on the Pt’s left and looking through them
• coronal: anterior to posterior