Term
|
Definition
| the principles associated with the study of blood circulation |
|
|
Term
|
Definition
| pressure differences and flow rate within the circulatory system are _____________ related |
|
|
Term
|
Definition
| the energy level differences between two points |
|
|
Term
|
Definition
| the quanitity of blood moving through the vessels per unit of time |
|
|
Term
|
Definition
| Disturbed flow occurs when the Reynolds number meets or exceeds |
|
|
Term
|
Definition
| Constant flow velocity acoss the vessel |
|
|
Term
|
Definition
| Flow characterized by cross current and multiple velocity components |
|
|
Term
|
Definition
| the gravitational weight of a column of blood that extends from the heart to a level where blood pressure is determined |
|
|
Term
| red blood cells are smaller than a wavelength |
|
Definition
| Raleigh scattering occurs when the________ |
|
|
Term
|
Definition
| If the RBC's are moving towards the transducer, the received frequency is _________ than the transmitted frequency. |
|
|
Term
|
Definition
| As the angle between the transducer and flow decreases, the doppler shift ___________ |
|
|
Term
|
Definition
| The type of doppler system that uses 2 crystals |
|
|
Term
|
Definition
| the most inaccurate Doppler shift occurs when the angle is |
|
|
Term
|
Definition
| the term applied when only the information from the selected gate will be processed |
|
|
Term
|
Definition
| aliasing occurs when the doppler shift exceeds what? |
|
|
Term
|
Definition
| Noise in the doppler signal that is generally caused by high amplitude Doppler shift echoes is what? |
|
|
Term
|
Definition
| the wall filter used in doppler is a type of |
|
|
Term
Fast Fourier Transform
FFT |
|
Definition
| Signal processing of the Doppler signal is accomplished by the_________________ |
|
|
Term
|
Definition
| In CWD the reflected wave from a moving interface is algebraically added with the reference wave form the ___________ frequency which is equal to the Doppler shift. |
|
|
Term
decrease PRF
decrease wall filter |
|
Definition
| What can you do to improve sensitivity to slow flow? |
|
|
Term
|
Definition
| Increasing the frequency of the transducer will ______________ the Doppler shift |
|
|
Term
| phase quadrature detector |
|
Definition
| a commonly used process for dirction in a Doppler instrument |
|
|
Term
continuous wave doppler
CWD |
|
Definition
| What Doppler technique doen not provide range resolution? |
|
|
Term
|
Definition
| Aliasing is a potential problem in PWD because of _________ sampling. |
|
|
Term
|
Definition
| What does wall filter do? |
|
|
Term
|
Definition
| What method is used for spectral analysis for pulsed Doppler? |
|
|
Term
|
Definition
| A common cause in Spectral mirroring is ________________ (also high Doppler gain) |
|
|
Term
increase PRF
decrease Frequency
use CWD |
|
Definition
| What do you do eliminate aliasing? |
|
|
Term
|
Definition
| the difference between the transmitted and received frequency |
|
|
Term
|
Definition
| increasing the doppler angle will result in a ________ Doppler shift |
|
|
Term
|
Definition
| The Nyquist limit refers to the _______ frequency |
|
|
Term
|
Definition
| You are using a 5MHz Doppler frequency transducer. 6kHz PRF 4 cm depth and a 1.5mm sample volume length. What is the aliasing frequency? |
|
|
Term
|
Definition
| What adjustment would you make if you cannot see the end diastolic flow on a tracing? |
|
|
Term
|
Definition
| Spectral broadening can be a sign of ___________ |
|
|
Term
|
Definition
| what type of transducer has 2 crystals? |
|
|
Term
| decrease doppler frequency |
|
Definition
| to assist you in obtaining signals from a deeper vessel what would you adjust? |
|
|
Term
|
Definition
associated with VFR
long straight tube
|
|
|
Term
increase velocity
drecrease pressure
stenosis |
|
Definition
|
|
