Sonography Principles and Instrumentation - ARDMS SPI Exam Multiple Choice Questions and Answers_2022/23.
Sonography Principles and Instrumentation - ARDMS SPI Exam Multiple Choice Questions and Answers_2022/23. A mechanical transducer utilizes: a. transmit focus b. receive focus c. fixed focus d. dynamic aperture focusing - A reflection will occur at the boundary of two media if the acoustic impedences of the two media are: a. equal b. different c. unchanged d. cannot be predicted - A strongly focused transducer implies a: a. short focal length; decreased beam divergence b. medium focal length; increased beam divergence c. long focal length; no beam divergenc d. short focal length; increased beam divergence - All of the following directly affect frame rate except: a. depth of penetration b. field of view c. number of focuses d. line density e. beam width - An increase in overall gain will result in all of the following except: a. increase in image brightness b. increase in output power c. increase in amplification of the returning signal d. decrease risk in bioeffects - An increase in packet size will _______ the frame rate - Decrease An increase in red blood cell velocity will_____ the Doppler Shift: a. increase b. decrease c. not change d. cannot be predicted - An increase in the number of pixels on the display will improve: - autocorrelation - B-mode displays reflector: a. amplitude and distance b. amplitude and velocity c. power and direction d. depth and speed - Clinical imaging transducers are: - Damping does not decrease: - Decibels are the units for all of the following except: a. amplitude b. transmit gain c. gain d. attenuation e. TGC f. dynamic range e. intensity - Doppler high pass filter eliminates: - high amplitude signals; low velocity flow Frequency is - How do you decrease period? - Impedance - Increasing propagation speed: - Increasing transmit gain increases everything except: - Increasing wavelength will ___________ frequency. a. increase b. decrease c. not change d. cannot be predicted. Multiple echoes, equally spaced originating from a gas bubble is called: a. comet tail b. ring down c. slice thickness artifact d. multipath Period - the time per cycle 1-10usec Period Calculation - Power/area= - PRF - Propagation speed is determined by: a. frequency b. harmonics c. bandwidth d. bulk modulus - Pulse duration - Pulse repetition frequency - Number of pulses that an ultrasound system transmits into the body each second. Hz. Typically 4-15 KHz. PRF and depth of a view are inversely related: When system is imaging deeper, the pulse repetition frequency is lower. Also the number of pulses created each second Quality Factor= Fundamental frequency/ bandwidth -. Refraction - Reject eliminates: - Resolution artifact - Spectral Broadening - Spectral broadening suggest: a. laminar flow b. turbulent flow c. flow away from the transducer d. flow towards the transducer The average speed of sound in soft tissue is: The best way to increase the near field length of an ultrasound beam is to: - increase transducer diameter The correct depth placement of reflectors depends primarily upon: a. frequency b. period c. power d. propagation speed The Doppler wall filter is considered a: The most common type of transducer used in echo is: The Nyquist Limit is equal to: a. propagation speed x frequency b. propagation speed/ wavelength c. PRF/2 d. 4xV^2 The percentage of time that the ultrasound instrument is emitting ultrasound is called: a. PRF b. pulse duration c. pulse repetition period d. duty factor The primary advantage of CW Doppler is: a. range resolution b. range discrimination c. range ambiguity d. range gating e. absence of sampling rate The primary cause of attenuation of ultrasound in soft tissue is caused by: - The range for audible sound is: - The range for ultrasound begins: a. 20 Hz b. 20,000 Hz c. 2 MHz d. 15 MHz The range of frequencies produced by a damped PZT element is called: a. fundamental frequencies b. Q Factor c. near field d. bandwith The transducer frequency is primarily determined by the transducer element: a. diameter b. thickness c. propagation speed d. type The unit for impedance? - The unit of duty factor is: a. Hz b. mm c. ms d. unitless - The wavelength of a 1MHz transducer is: There have been no proven biological effects for unfocused transducers for intensities below: - Wavelength What are the four acoustic variables: What color is usually use in color flow Doppler variance map to indicate turbulent flow? - green Which gain will increase the risk of bioeffects? a. transmit b. receive c. gain d. overall gain Which instrument control affects the amplitude (dB) of the outgoing signal: a. gain b. receiver gain c. TGC d. transmit gain e. overall gain Which of the following is considered the memory of an ultrasound instrument? a. pulser b. transducer c. receiver d. beam former e. digital scan converter f. display monitor Which of the following is used to convert Doppler shift information into color: a. high PRF b. fast Fourier transform c. autocorrelation d. time interval histogram Which of the following will increase the color flow jet area displayed? a. increase color gain b. increase velocity scale c. increase frequency With pulse wave Doppler axial resolution:
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sonography principles and instrumentation ardms
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sonography principles and instrumentation ardms spi exam multiple choice
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which gain will increase the risk of bioeffects a transmit
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