ARDMS SPI Exam | 60 QUESTIONS | RATED A+ 2025

Which gain will increase the risk of bioeffects? a. transmit b. receive c. gain d. overall gain Correct Answer: a. transmit 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 Correct Answer: e. digital scan converter Spectral broadening suggest: a. laminar flow b. turbulent flow c. flow away from the transducer d. flow towards the transducer Correct Answer: b. turbulent flow With pulse wave Doppler axial resolution: Correct Answer: degrades What color is usually use in color flow Doppler variance map to indicate turbulent flow? Correct Answer: green Doppler high pass filter eliminates: Correct Answer: high amplitude signals; low velocity flow The Doppler wall filter is considered a: Correct Answer: high pass filter The Nyquist Limit is equal to: a. propagation speed x frequency b. propagation speed/ wavelength c. PRF/2 d. 4xV^2 Correct Answer: c. PRF/2 Multiple echoes, equally spaced originating from a gas bubble is called: a. comet tail b. ring down c. slice thickness artifact d. multipath Correct Answer: b. ring down An increase in red blood cell velocity will the Doppler Shift: a. increase b. decrease c. not change d. cannot be predicted Correct Answer: a. increase 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.