Free Sonography Principles and Instrumentation (ARDMS SPI) Exam SPI Exam Practice Test

Which machine setting could cause aliasing to occur?

• Doppler scale too high
• Doppler scale too low
• Doppler gain too high
• Doppler gain too low

Which of these modes has the highest duty factor?

• Continuous wave Doppler
• Pulsed wave Doppler
• Color flow Doppler
• Gray-scale

What results from increasing the packet length when using color Doppler imaging?

• Decreased penetration
• Increased aliasing
• Increased color noise
• Decreased frame rate

What relates bandwidth to operating frequency?

• Autocorrelation
• Nyquist limit
• Focal zone
• Quality factor

During a color Doppler scan, which angle to flow would most likely result in no color being visualized?

• 3 degrees
• 45 degrees
• 88 degrees
• 175 degrees

Which factor causes posterior acoustic enhancement?

• High-frequency transducer
• Low-frequency transducer
• Strongly attenuating structure
• Weakly attenuating structure

Which outcome is an advantage of more pulses in an ensemble length?

• Reduced ghosting artifact
• Increased accuracy of velocity measurement
• Improved temporal resolution
• Increased line density

Which method of sanitizing the transducer would damage piezoelectric crystals?BleachGlutaraldehydeAlcoholAutoclave

• (1996). Essentials of Ultrasound Physics.

Which feature is a characteristic of continuous wave Doppler?

• Range specificity
• Aliasing
• Low thermal index
• Dedicated transmit and receive crystals

Which factor improves axial resolution?

• Shorter spatial pulse length
• Lower frequency transducer
• Narrower beamwidth
• Decreased compression