ARDMS SPI Exam Questions and Answers Verified 100% Correct

ARDMS SPI Exam Questions and Answers Verified 100% Correct The primary advantage of CW Doppler is: a. range resolution b. range discrimination c. range ambiguity d. range gating e. absence of sampling rate - CORRECT ANSWER e. absence of sampling rate The range for ultrasound begins: a. 20 Hz b. 20,000 Hz c. 2 MHz d. 15 MHz - CORRECT ANSWER b. 20,000 Hz (useful frequency range for clinical imaging is 2MHz-10MHz) Which instrument control affects the amplitude (dB) of the outgoing signal: a. gain b. receiver gain c. TGC d. transmit gain e. overall gain - CORRECT ANSWER d. transmit gain; amplitude can be affected by the sonographer 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 - CORRECT ANSWER c. autocorrelation b is incorrect because fast Fourier transform is the method used to process conventional Doppler shift information but is too slow a method for color Doppler Pulse repetition frequency - CORRECT ANSWER 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 The best way to increase the near field length of an ultrasound beam is to: - CORRECT ANSWER increase transducer diameter The range of frequencies produced by a damped PZT element is called: a. fundamental frequencies b. Q Factor c. near field d. bandwith - CORRECT ANSWER d. bandwidth 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 - CORRECT ANSWER d. duty factor; the maximum value is 1, the minimum is 0 The unit of duty factor is: a. Hz b. mm c. ms d. unitless - CORRECT ANSWER d. unitless Quality Factor= Fundamental frequency/ bandwidth - CORRECT ANSWER This allows doses of different types of radiation to be compared for their biological effects. Clinical imaging transducers are: - CORRECT ANSWER wide bandwidth; low q factor Power/area= - CORRECT ANSWER Intensity Increasing wavelength will ___________ frequency. a. increase b. decrease c. not change d. cannot be predicted. - CORRECT ANSWER b. decrease 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 - CORRECT ANSWER e. beam width 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 - CORRECT ANSWER b. different A mechanical transducer utilizes: a. transmit focus b. receive focus c. fixed focus d. dynamic aperture focusing - CORRECT ANSWER c. fixed focus; sonographer cannot determine the location of # of foci. mechanical transducer uses cross sectional imaging, rotating wheel, wobbler, oscillating mirror The transducer frequency is primarily determined by the transducer element: a. diameter b. thickness c. propagation speed d. type - CORRECT ANSWER b. thickness 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 - CORRECT ANSWER d. short focal length; increased beam divergence B-mode displays reflector: a. amplitude and distance b. amplitude and velocity c. power and direction d. depth and speed - CORRECT ANSWER a. amplitude and distance An increase in the number of pixels on the display will improve: - CORRECT ANSWER detail resolution