SPI Module 5 Hemodynamics & Doppler

Question 1

The physical principles associated with the study of blood circulation are termed:

Answer 1

hemodynamics

Question 2

Within the circulatory system, pressure differences and flow rate are:

Answer 2

directly related

Question 3

The energy level difference between two points is termed:

Answer 3

energy gradient

Question 4

The quantity of blood moving through the vessel per unit of time is called:

Answer 4

volume flow rate

Question 5

Disturbed flow occurs when the Reynold’s number meets or exceeds:

Answer 5

2000

Question 6

Constant flow velocity across the vessel is termed:

Answer 6

plug flow

Question 7

Flow characterized by cross currents and multiple velocity components is called

Answer 7

turbulent flow

Question 8

The gravitational weight of a column of blood that extends from the heart to a level where blood pressure is determined is:

Answer 8

hydrostatic pressure

Question 9

Venous pressure and flow are affected by:

Answer 9

• calf muscle pump
• venous valve
• respiration

Question 10

The most inaccurate Doppler shift occurs when the angle is:

Answer 10

90 degrees

Question 11

Rayleigh scattering occurs when the:

Answer 11

red blood cells are smaller than the wavelength of the sound beam

Question 12

If the red blood cells ( RBCs) are moving toward the transducer, the received frequency is:

Answer 12

higher than the transmitted frequency

Question 13

As the angle between the transducer and flow decreases, the Doppler shift:

Answer 13

increases

Question 14

The type of Doppler system that uses two crystals is termed:

Answer 14

continuous wave

Question 15

The term applied when only the information from the selected gate will be processed is:

Answer 15

range resolution

Question 16

Aliasing occurs when the Doppler shift exceeds the:

Answer 16

Nyquist limit

Question 17

Noise in the Doppler signal that is generally caused by high amplitude, Doppler shifted echoes is called:

Answer 17

clutter

Question 18

The wall filter used in Doppler is a type of:

Answer 18

rejection

Question 19

Signal processing of the Doppler signal is accomplished by the:

Answer 19

Fast Fourier Transform

Question 20

A faster but less accurate signal process used in color flow Doppler is called:

Answer 20

autocorrelation

Question 21

The term used to describe the number of pulses transmitted to interrogate multiple lines of color is called:

Answer 21

packet size

Question 22

The attribute of colors that permits classification into a color is termed:

Answer 22

hue

Question 23

Increasing packet size increases color sensitivity and accuracy and:

Answer 23

decreases frame rate

Question 24

The type of Doppler that does not rely on the reflector’s velocities is:

Answer 24

Color Power mode

Color Energy mode

Color Angio

Power Doppler

*they can be used interchangeably, know all the names