DMS-101 EXAM 1 (ALL) QUESTIONS AND ANSWERS

DMS-101 EXAM 1 (ALL) QUESTIONS AND ANSWERS
What is sound? - CORRECT ANSWER✅✅✅A wave which is created by vibrating objects and
propagated through a medium from one location to another



Can sound travel in a vacuum? - CORRECT ANSWER✅✅✅No



What is ultrasound? - CORRECT ANSWER✅✅✅Sound that has a frequency beyond the limits of
perception by the human ear



What is the range of human hearing? - CORRECT ANSWER✅✅✅20 Hz-20,000 Hz



What is the range of infrasound? - CORRECT ANSWER✅✅✅<20 Hz



What is the range of ultrasound? - CORRECT ANSWER✅✅✅>20,000 Hz



What is echolocation? - CORRECT ANSWER✅✅✅The use of ultrasound at various frequencies to
locate and identify objects in the water and air



What is diagnostic ultrasound? - CORRECT ANSWER✅✅✅a diagnostic procedure that uses high
frequency sound waves to image organs, masses, and fluid collections in the body



Who discovered the piezoelectric effect? - CORRECT ANSWER✅✅✅Pierre and Jacques Curie in 1880



Who is Paul Langevin? - CORRECT ANSWER✅✅✅French physicist, began developing sonar devices
to locate submarines in WWI- developed the hydrophone in 1915



What was Ultrasound used for in the 1930s-1940s? - CORRECT ANSWER✅✅✅To dectect flaws in
metal

,Who is Karl Therodore Dussik? - CORRECT ANSWER✅✅✅first physician to employ ultrasound in
medical diagnosis in 1940



What happened in 1960? - CORRECT ANSWER✅✅✅The first commercially available ultrasound
scanner was developed



Name 3 types of display modes - CORRECT ANSWER✅✅✅A-mode, B-mode, M-mode



What is A-mode? - CORRECT ANSWER✅✅✅Amplitude mode, amplitude is displayed as a vertical
deflection of the baseline



What is B-mode? - CORRECT ANSWER✅✅✅Brightness mode, echo signals displayed as a dot on a
screen, brightness of the dot proportional to the echo signal amplitude



What is real time imaging? - CORRECT ANSWER✅✅✅Live Imaging, function of B-mode, image is
produced by sweeping the beam over the tissue of interest electronically, frames are rapidly replaced
creating a "motion picture"



What is M-mode? - CORRECT ANSWER✅✅✅Motion mode OR time-motion mode, generated by a
slowly sweeping b-mode trace across a screen as a function of time



Linear Probe - CORRECT ANSWER✅✅✅Used to see vessels, appendicitis, scrotal



Curved Probe - CORRECT ANSWER✅✅✅Used to see big organs, thyroid, used most often



Vector Probe - CORRECT ANSWER✅✅✅Used to get in between ribs



Transvaginal Probe - CORRECT ANSWER✅✅✅Used to do rectal and transvaginal exams



When the ultrasound frequency is high, the resolution... - CORRECT ANSWER✅✅✅is better but it
doesn't penetrate as far

, When the ultrasound frequency is low, the resolution... - CORRECT ANSWER✅✅✅penetrates more
but is grainy



What is the Piezoelectric Principle? - CORRECT ANSWER✅✅✅A property of certain materials to
create a voltage when they are mechanically deformed



Casing - CORRECT ANSWER✅✅✅What is 1



Electrode - CORRECT ANSWER✅✅✅What is 2



Matching - CORRECT ANSWER✅✅✅What is 3



Crystal - CORRECT ANSWER✅✅✅What is 4



Backing - CORRECT ANSWER✅✅✅What is 5



How does sound travel? - CORRECT ANSWER✅✅✅As a mechanical, longitudinal wave



Can sound travel through a vacuum? - CORRECT ANSWER✅✅✅No



What is a mechanical wave? - CORRECT ANSWER✅✅✅a wave which is not capable of transmitting
its energy through a vacuum; they require a medium in order to transport their energy from one
location to another; sound wave



Longitudinal Wave - CORRECT ANSWER✅✅✅a wave in which particles of the medium move in a
direction parallel to the direction which the wave moves (Yo-yo)



Transverse Wave - CORRECT ANSWER✅✅✅a wave in which particles of the medium move in a
direction perpendicular to the source (ripples in water)