ARDMS Ultrasound Physics & Instrumentation Exam (2023/24) || Questions & Answers (Rated A+)

ARDMS Ultrasound Physics & Instrumentation Exam (2023/24) || Questions & Answers (Rated A+) ARDMS Ultrasound Physics & Instrumentation Exam (2023/24) || Questions & Answers (Rated A+) Which of the following is defined as only the active time? - ANSWER - Pulse duration The inertia of the medium describes its: - ANSWER - Density Which of the following is determined by the sound source only? - ANSWER - Frequency What is the total amount of attenuation that occurs if a 6.0-MHz sound beam travels through 4 cm of soft tissue? - ANSWER - 12 dB As imaging depth increases, pulse repetition period: - ANSWER - Increases If pulse repetition frequency increases, then the duty factor: - ANSWER - Increases The percentage of time that the ultrasound system is producing pulses of ultrasound describes the: - ANSWER - Duty factor Density and propagation speed are: - ANSWER - Inversely related All of the following are true of power except: - ANSWER - As amplitude increases, power remains the same All of the following are true of wavelength except: - ANSWER - It is equal to the period divided by the frequency Which of the following is determined by the sound source and medium? - ANSWER - Wavelength Which of the following is defined as the number of ultrasound pulses emitted in 1 second? - ANSWER - Pulse repetition frequency The prefix "centi" denotes: - ANSWER - Hundredths If the angle of incidence is 40°, what is the angle of transmission at the interface if medium 1 has a propagation speed of 1320 m/s and medium 2 has a propagation speed of 1700 m/s? - ANSWER - >40° The change in the direction of the original sound wave that occurs when sound interacts with two different tissue types that have a different propagation speed is referred to as: - ANSWER - Refraction Refraction is the change in direction of the transmitted sound beam that occurs with oblique incidence and dissimilar propagation speeds. Which of the following is an appropriate unit of measurement for propagation speed?