Musculoskeletal Ultrasound Flashcards Preview

Skin MS: Week 6 > Musculoskeletal Ultrasound > Flashcards

Flashcards in Musculoskeletal Ultrasound Deck (16):
1

MSK US definition

Use of high frequency sound waves to image soft tissues and bony structures for the purposes of diagnosing pathology or guiding real-time interventional procedures

2

Echogenicity

•Hyperechoic – more reflection, sound back to machine (brighter) – i.e. bone

•Hypoechoic – less reflection (darker)

3

Doppler detects _______

flow/vascularity

4

Long and short axis

•Long-axis – parallel

•Short axis - perpendicular (cross section)

5

•Acoustic impedance

•Resistance to sound waves (water highly impedent)

6

The deeper US goes ________

the lesser the resolution (Details)

7

Muscle is ___________ (echoic)

hypoechoic background (muscle fasciles) w/ hyperechoic strands (septae)

8

Nerve (echoic)

•Hypoechoic parallel lines (fascicles) separated by hyperechoic bands

9

Ligament (echoic)

hyperechoic

10

Tendon (Echoic)

hyperechoic

11

Advantages of MSK US

•Superior soft-tissue resolution to MR in many cases

•Real-time imaging / dynamic studies

•Image not degraded by metal

•Readily available

•Patient friendly, radiation-free

12

Disadvantages of MSK US

•Limited field of view

•Limited penetration

•Incomplete evaluation of bone and intra-articular structures

•Lack of competency and oversight

•Operator dependent

13

To get deeper, use __________

lower frequency, curved probe

14

To get superficial details, use ___________

Higher frequency, straight probe

15

Anisotropy 

Artifact - need to be perpendicular or get darkening 

16