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Which gain will increase the risk of bioeffects? A. Transmit ÖÖ b. Receive c. Gain d. Overall gain 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 converterÖÖ f. Display monitor E. Digital scan converter Spectral broadening suggest: a. Laminar flow b. Turbulent flowÖÖ c. Flow away from the transducer d. Flow towards the transducer B. Turbulent flow With pulse wave doppler axial resoluKon: Degrades
ARDMS SPI EXAM 2024- 2025
(ACTUAL QUESTIONS AND
CORRECT ANSWERS)
What color is usually use in color flow doppler variance map to indicate turbulent flow? GreenÖÖ Doppler high pass filter eliminates: High amplitude signals; low velocity flowÖÖ The doppler wall filter is considered a: High pass filterÖÖ The nyquist limit is equal to: a. PropagaKon speed x frequency b. PropagaKon speed/ wavelength c. Prf/2ÖÖ d. 4xv^ C. Prf/ MulKple echoes, equally spaced originaKng from a gas bubble is called: a. Comet tail b. Ring downÖÖ c. Slice thickness arKfact d. MulKpath B. Ring down An increase in red blood cell velocity will_____ the doppler shiX: a. IncreaseÖÖ b. Decrease c. Not change d. Cannot be predicted A. Increase The primary advantage of cw doppler is: a. Range resoluKon
Pulse repeKKon 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 repeKKon 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: 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 D. Bandwidth The percentage of Kme that the ultrasound instrument is emicng ultrasound is called: a. Prf b. Pulse duraKon c. Pulse repeKKon period d. Duty factor 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 D. Unitless Quality factor= fundamental frequency/ bandwidth
This allows doses of different types of radiaKon to be compared for their biological effects. Clinical imaging transducers are: Wide bandwidth; low q factor Power/area= Intensity Increasing wavelength will ___________ frequency. A. Increase b. Decrease c. Not change d. Cannot be predicted. B. Decrease All of the following directly affect frame rate except: a. Depth of penetraKon b. Field of view c. Number of focuses d. Line density e. Beam width E. Beam width A reflecKon will occur at the boundary of two media if the acousKc impedences of the two media are: a. Equal b. Different c. Unchanged d. Cannot be predicted B. Different
Detail resoluKon PropagaKon speed is determined by: a. Frequency b. Harmonics c. Bandwidth d. Bulk modulus D. Bulk modulus Increasing transmit gain increases everything except: Frequency The correct depth placement of reflectors depends primarily upon: a. Frequency b. Period c. Power d. PropagaKon speed D. PropagaKon speed Which of the following will increase the color flow jet area displayed? A. Increase color gain b. Increase velocity scale c. Increase frequency A. Increase color gain Increasing propagaKon speed: Air, soX Kssue, bone The most common type of transducer used in echo is: Sector phased array Decibels are the units for all of the following except: a. Amplitude b. Transmit gain
c. Gain d. AhenuaKon e. Tgc f. Dynamic range e. Intensity E. Intensity= mw/cm What are the four acousKc variables:
- Temperature, density, parKcle moKon, pressure Frequency is Cycles per second (hz) not affected by sonographer increase frequency; decrease depth Pulse duraKon Period (ms) x # of cycles in a pulse Wavelength The length of one cycle wavelength= propagaKon speed/ frequency 1.54/3mhz= .5mm An increase in packet size will _______ the frame rate Decrease The range for audible sound is: 20 hz- 20khz The wavelength of a 1mhz transducer is: 1.54/1= 1.54mm The average speed of sound in soX Kssue is: 1540m/s; 1.54km/s; 1.54mm/us
Used to convert doppler shiX informaKon into color. Prf Pulse repeKKon frequency. The rate at which pulses are transmihed, given in hertz or pulses per second; reciprocal of pulse-repeKKon Kme. Period The Kme per cycle 1 - 10usec Period calculaKon 1/frequency 1/5mhz=. How do you decrease period? Increase frequency Impedance The opposiKon of sound propagaKon The unit for impedance? Rayls
