SPI Study guides, Class notes & Summaries

Which of the following do the source and the medium determine? a. duty factor b. frequency c. propagation speed d. axial resolution correct answers d. Axial resolution is affected by all of the following EXCEPT a. frequency b. damping c. spatial pulse length d. focusing correct answers 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 a...

Incident intensity is? correct answers The intensity of the sound beam just before it strikes a reflector Describe normal incidence, and oblique incidence. correct answers Normal incidence is when the sound beam hits a reflector at a 90* angle, and oblique is any angle other than 90*. Rayleigh scattering is correct answers sound scattering equally in all directions after hitting a reflector smaller than the beam wavelength. RBC's How would impedance increase? correct answers If the med...

SPI Board Exam Review (GB) 600+ Complete Q&A (2022/2023.)(100% Verified Answers Graded A+) is the reciprocal of period. A. inverse period B. PRP C. frequency D. propagation speed - C. Frequency A bouquet has 30 flowers. The size of the bouquet is decreased by a factor of 3. How many flowers remain? A. 27 B. 0 C. 10 D. 15 - C. 10 A byte is composed of bits. A word is composed of bytes. A. 2, 2 B. 8, 2 C. 16, 16 D. 8, 16 - B. 8, 2 (a string of eight bits of computer memory is a ...

What action below would be most in keeping with the ALARA principle while performing a diagnostic ultrasound examination? A: Allow multiple students to scan an obstetrical patient because the fetus is in a good position for imaging. B: Prolong the sonogram to make videos of the fetus for each family member. C: Complete the diagnostic scan in a timely fashion at the lowest output power that achieves a quality image. D: Maximize the acoustic output to brighten the overall image. E: Extend...

SPI practice test questions & answers 2023/2024 If the thickness of the 2 substances forming the interface is increased then the amount of beam reflected is...? - ANSWER-unchanged what determines the Pulse Repetition Frequency (PRF)? - ANSWER-The source of sound with which type of array are grating lobes most common? - ANSWER-linear array If the Doppler equation Fd=2Fo v/c what does v stand for? - ANSWER-the velocity of target of the following, what is produced by low attenuation?...

SPI Practice Questions #1 2023/2024 B. The absence of echos Question 1 Explanation: An (without) echoic (producing echoes) - ANSWER-1. The term Anechoic in relation to a sonographic image means? A. structure that appears lighter than the surrounding structures B. The absence of echos C. A structure that appears the same as surrounding structures D. A structure that reflects 100% of the sound wave C.The system with the larger diameter crystal. - ANSWER-2. If you have two near identic...

Sound waves are: correct answers longitudinal, mechanical The speed of sound in soft tissue is closest to: correct answers 1,500 m/s The frequency closest to the lower limit of ultrasound is: correct answers 15,000 Hz Which is not an acoustic variable? correct answers intensity The effects of soft tissue on ultrasound are called: correct answers acoustic propagation properties All of the following are true EXCEPT: correct answers two waves with identical frequencies must interfere...

length is measured in - Answer- cm, feet area is measured in - Answer- cm^2, feet^2 volume is measured in - Answer- cm^3, feet^3 percent is not - Answer- a unit increase by a factor means - Answer- to multiply decrease by a factor means - Answer- to divide how many hertz is 3 MHZ - Answer- 3,000,000 how much bigger is a billion than a million - Answer- 1000 times how many milliliters are contained in a jar filled with 5 liters of fluid - Answer- 5000 how many liters ar...

When the ELASTICITY of a medium is HIGH, the _____ is HIGH - stiffness - prop. speed - compressibility - reflectivity - Answer compressibility What term describes the # of cycles that an acoustic variable completes in a second? - period - freq. - PRP - variable rate - Answer freq. What happens to venous flow return to the HEART when a person INHALES? - Answer increases What establishes the freq. of an US wave? - transducer - medium through whic...