ultrasound 4

Question 1

What are decibels (DB) ?

Answer 1

Decibels are the units responsible for measuring the difference between sound intensities, the sound wave produced by the transducer and the returning echo wave.

Question 2

What is the doppler effect?

Answer 2

the difference between the frequency of sound as it leaves and arrives. When sound is coming towards you the frequency of the sound wave increases leading to a higher pitch/ when sound us moving away from you the frequency of the sound wave decreases leading to a lower pitch.

Question 3

What is a A mode ultrasound scan?

Answer 3

Amplitude modulated scan which produces a graph showing the strengths of reflections

Question 4

What is a B mode ultrasound scan ?

Answer 4

Brightness modulated scan which produces a 2D greyscale based on the strength of reflected sound echos according to depth

Question 5

What is a M mode ultrasound

Answer 5

a motion mode scan that shows motion and video images

Question 6

What is a Doppler scan?

Answer 6

measurement of the change in sound frequency to show the speed and direction of blood flow