SPI Practice Test Graded A+

SPI Practice Test Graded A+ 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 resolution d. reduces the duty factor and increases the range of transmitted frequencies ️d. Far zone beam divergence can be reduced on a single-element transducer by using a. a transducer with a smaller element diameter b. a higher frequency transducer c. a lower frequency transducer or a smaller element diameter d. adjustable focusing ️b. The area between the face of an unfocused single-element transducer and the point where the beam starts to diverge is the a. Fraunhofer zone b. refraction zone c. focal zone d. near zone ️d. Assuming a fixed frequency, what happens if the diameter of an unfocused transducer is increased? a. the far zone divergence increases b. the penetration decreases c. the length of the near zone increases d. the length of the near zone decreases ️c. Which of the following does NOT affect lateral resolution? a. focusing b. element diameter c. frequency d. bandwidth ️d. Higher frequency transducers provide a. improved lateral resolution b. smaller Doppler shifts c. improved axial resolution and reduced attenuation d. increased penetration ️a. Ultrasound waves that are traveling through a medium consist of a. electromagnetic and radio frequencies b. compressions and refractions c. electromagnetic and ionizing frequencies d. compressions and rarefactions ️d. What is the difference between audible sound and ultrasound? a. audible sound waves can travel through a vacuum b. audible sound has a higher frequency c. ultrasound has a higher frequency d. ultrasound waves are ionizing ️c. A decrease in the thickness of a piezoelectric element will result in a. a greater pulse duration b. an increase in the propagation speed c. a decrease in the quality factor if the bandwidth decreases d. an increase in the frequency of the transducer ️d. The resonant frequency of a pulsed-wave ultrasound transducer is dependent on a. damping b. the backing material c. the thickness of the piezoelectric element and the speed of sound through the piezoelectric element d. the amplitude of the voltage applied to the piezoelectric element ️c. The image is brighter at the level of the focal zone. Which of the following controls is best