Emergency Medicine - Intro to Ultrasound

Question 0

effect of incr wavelength

Answer 0

decr resolution, incr penetration

Question 1

effect of increased frequency

Answer 1

incr resolution, decr penetration

Question 2

how do you make US image brighter

Answer 2

incr gain

Question 3

where does probe point

Answer 3

to patients R or head

Question 4

how does US determine depth of object

Answer 4

amt of time since Echo generated divided by 2 (bc distance = velocity*time)

Question 5

what probe do you use for IV

Answer 5

linear - high F, max depth 6cm

Question 6

what probe for abdomen

Answer 6

curvilinear, depth 26cm

Question 7

colors flow dopler

Answer 7

RED towards, BLUE away

Question 8

Impedance

Answer 8

Measure of materials tendency to transmit waves. Impacted by elasticity and density of material

Question 9

Good and poor speculation reflectors

Answer 9

Good: fascial planes, diaphragm
Poor: lung and air filled bowel

Question 10

Anisotropy

Answer 10

Echogenic when viewed at right angle to US beam, anechoic at other angles

Question 11

Strong echos look? Absence of echos? Intermediate?

Answer 11

Bright. Black. Gray.