Question 1

A decrease in pressure in regions of high flow speed is called the Poiseuille's effect.

Accepted Answer

A) True 
 B)False  False

Question 2

If the flow speed increases,the pressure decreases.

Accepted Answer

A) True 
 B)False  True

Question 3

Resistance of the blood flow depends on the radius of the ________.

Accepted Answer

A)  tube to the fourth power 
B)  tube squared 
C)  tube divided by the length of the tube 
D)  tube 
A)  tube to the fourth power 
B)  tube squared 
C)  tube divided by the length of the tube 
D)  tube A

Question 4

The difference between the emitted frequency and the echo frequency returning from a moving scatterer is called ________.

Accepted Answer

A)  Doppler effect 
B)  Doppler shift 
C)  continuity rule 
D)  Bernoulli effect 
A)  Doppler effect 
B)  Doppler shift 
C)  continuity rule 
D)  Bernoulli effect

Question 5

As flow energy increases,pressure energy increases.

Accepted Answer

A) True 
 B)False

Question 6

The fast Fourier transform derives the Doppler ________.

Accepted Answer

A)  color scale 
B)  spectrum 
C)  variance maps 
D)  power display 
A)  color scale 
B)  spectrum 
C)  variance maps 
D)  power display

Question 7

In pulsed Doppler imaging,the operator of the ultrasound system controls the length and location of the sample volume.

Accepted Answer

A) True 
 B)False

Question 8

The Doppler shift is proportional to the blood flow speed.

Accepted Answer

A) True 
 B)False

Question 9

If the pressure difference between two points increases,the flow rate also increases.

Accepted Answer

A) True 
 B)False

Question 10

Volumetric flow rate is proportional to flow resistance.

Accepted Answer

A) True 
 B)False

Question 11

The Doppler shift is directly related to volumetric flow rate,not the flow speed.

Accepted Answer

A) True 
 B)False

Question 12

The volumetric flow rate is equal to ________.

Accepted Answer

A)  pressure difference multiplied by the resistance 
B)  resistance of blood flow multiplied by the flow rate 
C)  average flow rate across the vessel multiplied by the cross-sectional area of the vessel 
D)  force per unit area 
A)  pressure difference multiplied by the resistance 
B)  resistance of blood flow multiplied by the flow rate 
C)  average flow rate across the vessel multiplied by the cross-sectional area of the vessel 
D)  force per unit area

Question 13

A Doppler shift at 60 degrees is ________ what it would be at 0 degrees.

Accepted Answer

A)  twice 
B)  one half of 
C)  three times 
D)  two thirds of 
A)  twice 
B)  one half of 
C)  three times 
D)  two thirds of

Question 14

The normal adult circulatory system contains ________ liters of blood.

Accepted Answer

A)  3 
B)  4 
C)  5 
D)  6 
A)  3 
B)  4 
C)  5 
D)  6

Question 15

Higher operating frequencies produce larger Doppler shifts.

Accepted Answer

A) True 
 B)False

Question 16

The state of the downstream arterioles is reflected in the ________.

Accepted Answer

A)  arterial peak systole 
B)  arterial diastolic flow 
C)  venous flow rate during expiration 
D)  venous flow rate during inspiration 
A)  arterial peak systole 
B)  arterial diastolic flow 
C)  venous flow rate during expiration 
D)  venous flow rate during inspiration

Question 17

Echoes arrive from the sample volume depth at a rate equal to ________.

Accepted Answer

A)  the pulse repetition frequency 
B)  twice the pulse repetition frequency 
C)  one half of the pulse repetition frequency 
D)  one quarter of the pulse repetition frequency 
A)  the pulse repetition frequency 
B)  twice the pulse repetition frequency 
C)  one half of the pulse repetition frequency 
D)  one quarter of the pulse repetition frequency

Question 18

The maximum detectable blood flow speed with pulsed Doppler imaging is determined by aliasing.

Accepted Answer

A) True 
 B)False

Question 19

Pulsatile flow is uncommon in arterial circulation.

Accepted Answer

A) True 
 B)False

Question 20

Sound reflects totally at the wall-blood boundary once the Doppler angle is less than ________ degrees.

Accepted Answer

A)  30 
B)  40 
C)  50 
D)  60 
A)  30 
B)  40 
C)  50 
D)  60

A decrease in pressure in regions of high flow speed is called the Poiseuille's effect.

If the flow speed increases,the pressure decreases.

Resistance of the blood flow depends on the radius of the ________.

The difference between the emitted frequency and the echo frequency returning from a moving scatterer is called ________.

As flow energy increases,pressure energy increases.

The fast Fourier transform derives the Doppler ________.

In pulsed Doppler imaging,the operator of the ultrasound system controls the length and location of the sample volume.

The Doppler shift is proportional to the blood flow speed.

If the pressure difference between two points increases,the flow rate also increases.

Volumetric flow rate is proportional to flow resistance.

The Doppler shift is directly related to volumetric flow rate,not the flow speed.

The volumetric flow rate is equal to ________.

A Doppler shift at 60 degrees is ________ what it would be at 0 degrees.

The normal adult circulatory system contains ________ liters of blood.

Higher operating frequencies produce larger Doppler shifts.

The state of the downstream arterioles is reflected in the ________.

Echoes arrive from the sample volume depth at a rate equal to ________.

The maximum detectable blood flow speed with pulsed Doppler imaging is determined by aliasing.

Pulsatile flow is uncommon in arterial circulation.

Sound reflects totally at the wall-blood boundary once the Doppler angle is less than ________ degrees.

Introduction

Ultrasound

Transducers

Instruments

Artifacts

Performance and Safety

Filters

Exam 5: Doppler Principles

A decrease in pressure in regions of high flow speed is called the Poiseuille's effect.

If the flow speed increases,the pressure decreases.

Resistance of the blood flow depends on the radius of the ________.

The difference between the emitted frequency and the echo frequency returning from a moving scatterer is called ________.

As flow energy increases,pressure energy increases.

The fast Fourier transform derives the Doppler ________.

In pulsed Doppler imaging,the operator of the ultrasound system controls the length and location of the sample volume.

The Doppler shift is proportional to the blood flow speed.

If the pressure difference between two points increases,the flow rate also increases.

Volumetric flow rate is proportional to flow resistance.

The Doppler shift is directly related to volumetric flow rate,not the flow speed.

The volumetric flow rate is equal to ________.

A Doppler shift at 60 degrees is ________ what it would be at 0 degrees.

The normal adult circulatory system contains ________ liters of blood.

Higher operating frequencies produce larger Doppler shifts.

The state of the downstream arterioles is reflected in the ________.

Echoes arrive from the sample volume depth at a rate equal to ________.

The maximum detectable blood flow speed with pulsed Doppler imaging is determined by aliasing.

Pulsatile flow is uncommon in arterial circulation.

Sound reflects totally at the wall-blood boundary once the Doppler angle is less than ________ degrees.

Introduction

Ultrasound

Transducers

Instruments

Artifacts

Performance and Safety

Filters