Download Understanding Sound Waves and Ultrasound for the ARDMS SPI 500 Exam and more Exams Medical Sciences in PDF only on Docsity! ARDMS SPI 500 EXAM. A sound wave is - Correct Answer mechanical, longitudinal A compression area of a sound wave is - Correct Answer high pressure, high density A rarefaction area of a sound wave is - Correct Answer low pressure, low density Which is considered an acoustic variable - Correct Answer pressure Which is a unit for pressure - Correct Answer N/m2 Which is a unit for density - Correct Answer lbs/cm3 Which wave propagates in a medium - Correct Answer sound The range for ultrasound is - Correct Answer greater than 20KHz ____ is the number of wave cycles per second - Correct Answer frequency One kilohertz is equal to - Correct Answer 1,000 cycles per second One megahertz is equal to - Correct Answer 1,000,000 cycles per second The useful frequency range for clinical imaging ultrasound is - Correct Answer 2 MHz to 10 MHz Frequency is determined by the - Correct Answer source Frequency affects all of the following, except: wavelength, resolution, penetration, impedance - Correct Answer impedance The times per cycle is - Correct Answer period The period for a 5 MHz probe is - Correct Answer 0.2usec If frequency increases, period will - Correct Answer decreases Period is determined by the - Correct Answer source Period multiplied by the number of cycles in a pulse equals - Correct Answer pulse duration The distance between cyclical peaks is - Correct Answer wavelength The symbol for wavelength is - Correct Answer lambda The wavelength of a 5 MHz probe in soft tissue is - Correct Answer 0.3 mm As frequency increases, wavelength (assume same medium) - Correct Answer decreases Wavelength is determined by the - Correct Answer source and medium As wavelength decreases - Correct Answer resolution improves The rate at which a sound vibration propagates through a medium is called all of the following, except: sound speed, prop speed, speed of sound, velocity - Correct Answer velocity The units for propagation speed include all the following, except: km/sec, mph, msec, mm/sec - Correct Answer msec The average speed of sound in soft tissue is - Correct Answer 1540 m/sec Arrange the following in increasing order of sound speed in soft tissue - Correct Answer air, fat, muscle, soft tissue, muscle, bone The prop speed of sound of the ceramic lead zirconate titanate (PZT) is approx - Correct Answer 4000 m/sec speed of sound is determined by - Correct Answer medium The peak variation minus the mean variation is - Correct Answer amplitude All of the following are possible units for amplitude, except: degrees, decibels, Pascal, watts - Correct Answer degrees The maximum variation of an acoustic variable is 60. The mean value is 45. The maximum value is 30. The amplitude is - Correct Answer 15 Amplitude is determined by - Correct Answer source Which ultrasound machine control will affect amplitude - Correct Answer output power As sound propagates through a medium, amplitude - Correct Answer decreases
