SPI Module 5 Hemodynamics & Doppler Flashcards
The physical principles associated with the study of blood circulation are termed:
hemodynamics
Within the circulatory system, pressure differences and flow rate are:
directly related
The energy level difference between two points is termed:
energy gradient
The quantity of blood moving through the vessel per unit of time is called:
volume flow rate
Disturbed flow occurs when the Reynold’s number meets or exceeds:
2000
Constant flow velocity across the vessel is termed:
plug flow
Flow characterized by cross currents and multiple velocity components is called
turbulent flow
The gravitational weight of a column of blood that extends from the heart to a level where blood pressure is determined is:
hydrostatic pressure
Venous pressure and flow are affected by:
- calf muscle pump
- venous valve
- respiration
The most inaccurate Doppler shift occurs when the angle is:
90 degrees
Rayleigh scattering occurs when the:
red blood cells are smaller than the wavelength of the sound beam
If the red blood cells ( RBCs) are moving toward the transducer, the received frequency is:
higher than the transmitted frequency
As the angle between the transducer and flow decreases, the Doppler shift:
increases
The type of Doppler system that uses two crystals is termed:
continuous wave
The term applied when only the information from the selected gate will be processed is:
range resolution
Aliasing occurs when the Doppler shift exceeds the:
Nyquist limit
Noise in the Doppler signal that is generally caused by high amplitude, Doppler shifted echoes is called:
clutter
The wall filter used in Doppler is a type of:
rejection
Signal processing of the Doppler signal is accomplished by the:
Fast Fourier Transform
A faster but less accurate signal process used in color flow Doppler is called:
autocorrelation
The term used to describe the number of pulses transmitted to interrogate multiple lines of color is called:
packet size
The attribute of colors that permits classification into a color is termed:
hue
Increasing packet size increases color sensitivity and accuracy and:
decreases frame rate
The type of Doppler that does not rely on the reflector’s velocities is:
Color Power mode
Color Energy mode
Color Angio
Power Doppler
*they can be used interchangeably, know all the names
