URR mock test 1 (with complete solutions)

Which of the following transducers will produce the highest frequency sound waves? A. 6mm element thickness, 2mm/μs propagation speed of the element B. 2mm element thickness, 6mm/μs propagation speed of the element C. 6mm element thickness, 6mm/μs propagation speed of the element D. 2mm element thickness, 2mm/μs propagation speed of the element correct answers 2mm element thickness, 6mm/μs propagation speed of the element The narrowest portion of a beam produced by a focused ultrasound transducer is: A. the focal point B. the Fresnel zone C. the Fraunhofer zone D. the first centimeter of the beam that leaves the transducer correct answers the focal point If a Doppler system is operating at a PRF of 5000/s what is the maximum Doppler frequency that can be detected? A. 2500kHz B. 500kHz C. 2.5kHz D. 5kHz correct answers 2.5kHz Why does Doppler tracing not touch the baseline on either side? A. high filter settings B. decreased Doppler gain settings C. spectral broadening D. decreased rejection settings correct answers high filter settings Which of the following statements correctly describes annular arrays? A. an annular array can electronically focus the beam B. an annular array can use phasing to electronically steer the beam C. annular arrays provide the lowest slice thickness resolution D. annular arrays usually contain 30 or more circular elements correct answers an annular array can electronically focus the beam Which of the following describes the primary advantage of a 1.5D array over a 1D array? A. the 1.5D array eliminates the need for a stand-off pad for superficial imaging B. the 1.5D array can produce a trapezoid field of view while the 1D array can only produce a rectangular field of view C. the 1.5D array allows for 3D imaging while the 1D array does not D. the 1.5D array allows for variable elevation focus while the 1D array has a fixed elevation focus correct answers the 1.5D array allows for variable elevation focus while the 1D array has a fixed elevation focus What wave parameter is defined as the wavelength times the number of cycles in the pulse? A. period