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physics questions
questions from work sheet
38
Physics
01/17/2013

Term
 hemodynamics
Definition
 the principles associated with the study of blood circulation
Term
 directly
Definition
 pressure differences and flow rate within the circulatory system are _____________ related
Term
Definition
 the energy level differences between two points
Term
 Volumetric Flow Rate VFR
Definition
 the quanitity of blood moving through the vessels per unit of time
Term
 2000
Definition
 Disturbed flow occurs when the Reynolds number meets or exceeds
Term
 plug flow
Definition
 Constant flow velocity acoss the vessel
Term
 turbulent
Definition
 Flow characterized by cross current and multiple velocity components
Term
 hydrostatic pressure
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
 greater
Definition
 If the RBC's are moving towards the transducer, the received frequency is _________ than the transmitted frequency.
Term
 increase
Definition
 As the angle between the transducer and flow decreases, the doppler shift ___________
Term
 continuous wave doppler
Definition
 The type of doppler system that uses 2 crystals
Term
 90 degree
Definition
 the most inaccurate Doppler shift occurs when the angle is
Term
 range resolution
Definition
 the term applied when only the information from the selected gate will be processed
Term
 Nyquist Limit
Definition
 aliasing occurs when the doppler shift exceeds what?
Term
 clutter
Definition
 Noise in the doppler signal that is generally caused by high amplitude Doppler shift echoes is what?
Term
 reject control
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
 beat
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
 increase
Definition
 Increasing the frequency of the transducer will ______________ the Doppler shift
Term
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
 under low
Definition
 Aliasing is a potential problem in PWD because of _________ sampling.
Term
 decrease clutter
Definition
 What does wall filter do?
Term
 FFT
Definition
 What method is used for spectral analysis for pulsed Doppler?
Term
 90 degree
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
 Doppler shift frequency
Definition
 the difference between the transmitted and received frequency
Term
 decrease
Definition
 increasing the doppler angle will result in a ________ Doppler shift
Term
 aliasing
Definition
 The Nyquist limit refers to the _______ frequency
Term
 3kHz   6/2 PRF/2
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
 deacrese wall filter
Definition
 What adjustment would you make if you cannot see the end diastolic flow on a tracing?
Term
 turbulent flow
Definition
 Spectral broadening can be a sign of ___________
Term
 countinuous wave
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
 Poiseuilles
Definition
 associated with VFR long straight tube
Term
 increase velocity drecrease pressure stenosis
Definition
 Bernouli's
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