ARDMS SPI EXAM QUESTIONS AND ANSWERS UPDATED (2024/2025) (VERIFIED ANSWERS)

ARDMS SPI EXAM QUESTIONS AND ANSWERS UPDATED (2024/2025) (VERIFIED ANSWERS) Which instrument control affects the amplitude (dB) of the outgoing signal: a. gain b. receiver gain c. TGC d. transmit gain e. overall gain - ANS 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 - ANS 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 - ANS 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: - ANS 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 - ANS 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 - ANS 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 - ANS d. unitless Quality Factor= Fundamental frequency/ bandwidth - ANS This allows doses of different types of radiation to be compared for their biological effects. Clinical imaging transducers are: - ANS wide bandwidth; low q factor Power/area= - ANS Intensity Increasing wavelength will ___________ frequency. a. increase b. decrease c. not change d. cannot be predicted. - ANS b. decrease All of the following directly affect frame rate except: a. depth of penetration