SPI Study guides, Class notes & Summaries

What is frequency determined by? - Answer- The source, thickness of piezoelectric element and propagation speed to a lesser degree Thicker element is equal to ________ frequencies - Answer- Lower What is the reciprocal of frequency and what is the symbol - Answer- Period, T The time it takes for 1 cycle to occur - Answer- Period What is propagation speed determined by - Answer- Stiffness and density of the medium Propagation speed of sound through soft tissue - Answer- 1,540 m/s ...

The sonographer may avoid aliasing by altering the: - Answer- image depth Which statement regarding the differences between pulsed and continuous wave Doppler is NOT correct? - Answer- CW Doppler offers significantly improved range resolution. The coupling gel used for ultrasound exams provides the same function as what transducer component? - Answer- matching layer What is the frequency of a transducer with a 10mm element, 14kHz PRF and a propagation speed of 5 millimeters / microsecon...

SPI MOCK questions with correct answers

Reducing the likelihood of bioeffects from acoustic energy is the mission of the: A. Nyquist limit B. Reynolds number C. Huygens principle D. ALARA principle E. Poiseuille principle - ️️D. ALARA principle The number of cycles in a pulse directly related to the: A. Duty factor B. SPL C. operating frequency D. PRF E. propagation speed of the medium - ️️B. SPL The Doppler shift frequency is proportional to the: A. Cosine values B. Doppler angle C. Operatin...

SPI Exam Review questions with correct answers

What is described as the ability of an object to resist compression and relates to the hardness of a medium? - ️️stiffness An increase in PRF would lead to - ️️an increase in DF what has the higher propagation speed? air, bone, soft tissue or water - ️️bone what has a lower propagation speed? water, soft tissue, bone or lung tissue - ️️lung tissue as imaging depth increases, the PRF must - ️️decrease what law describes the amount of refraction that occurs at an...

Which of the following do the source and the medium determine? a. duty factor b. frequency c. propagation speed d. axial resolution - ️️d. Axial resolution is affected by all of the following EXCEPT a. frequency b. damping c. spatial pulse length d. focusing - ️️d. Damping in a transducer a. reduces the number of cycles in a pulse and increases the quality factor b. increases the number of cycles in a pulse and increases penetration c. causes poor axial and lateral...

What are the units of Wavelength? - Answer- millimeters What are the units of Frequency? - Answer- Hertz What are the units of Intensity? - Answer- Watts/cm 2 What are the units of propagation speed? - Answer- meters/sec What are the units of period? - Answer- second power - Answer- watts Wavelength is determine by ________. - Answer- medium and sound source Frequency is determine by ________. - Answer- sound source Intensity is determine by ________. - Answer- sound sour...

What is depth of view? correct answers The maximum distance into the body that an ultrasound system is imaging What is pulse reputation period (PRP)? correct answers The time from the start of one pulse to the start of another. What are the two components of PRP? correct answers Transmit time and receive time What is another term for transmit time? correct answers Pulse duration What is pulse duration? correct answers The time it takes for one pulse to occur How are PRP and pulse ...