Spi Exam 2 With Complete Solutions

reflection occurs between... {Ans: 2 different types of tissue/material}what would be the degree of refraction if the incident angle is 50 degrees and a transmission angle is 80 degrees? {Ans: 30 degrees}the attenuation coefficient in soft tissues is equal to {Ans: 1/2 operating frequency}what is used to eliminate air trapped on skin surface and matching layer of the transducer {Ans: gel}if a 10Mhz sound travels through soft tissue, how much total attenuation has occurred at a depth of 5cm? {Ans: 10/2 x 5 = 5x5 = 25 dB}"Which of the following would likely be true given a boundary between two mediums, one with an acoustic impedance of 4 MRayls, and the second with and acoustic impedance of 4.1 Mrayls?" {Ans: there would be very little reflection}