Mod 1 Unit 1 (Intro)

Question 1

Medical imaging ultrasound accomplished using what technique?

Answer 1

pulse-echo

Question 2

Distance=

Answer 2

velocity x time

Question 3

Brightness of ‘dot’ intrinsic factors

Answer 3

acoustic impedance, reflection type, absorption, output power/intensity/focus position

Question 4

Brightness of ‘dot’ extrinsic factors

Answer 4

instrumentation: gains, TGC
dynamic range
monitor changes

Question 5

Variable echo strength=

Answer 5

grey scale image

Question 6

Acoustic impedance determines

Answer 6

degree of sound reflection between mediums

Question 7

Medium impedance=

Answer 7

density x velocity (Rayls)

Question 8

Scan line

Answer 8

display of reflected echos per pulse of sound from transducer

Question 9

Linear format

Answer 9

closely spaced vertical scan lines, rectangle display, superficial anatomy

Question 10

Sector format

Answer 10

same origin, slice of pie, cardiac

Question 11

Curvilinear format

Answer 11

different origin, pulses in different directions, abdo/pelvic/obstetric

Question 12

Doppler effect

Answer 12

change in transmitted sound frequency by a moving object

Question 13

Types of doppler

Answer 13

audible, colour, power, PW spectral