ULTRASOUND Word Scramble

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Question	Answer
What is ultrasound? (how does it work?)	an imaging technique that uses high frequency sound waves to produce images or organs and structures in the body.
How are images produced in ultrasound?	by recording the reflections (echoes) of ultrasonic waves directed into the body.
Two functions of the transducer?	admits sound waves and reads them
High frequency transducer = what?	more superficial read.
Low frequency transducer = what?	will go deeper into the body
Why are some transducers flat?	to have constant contact with the body
Linear or curved linear traducers are used for?	abdomens
Sound waves that are heard by the human ear are called? What is their frequency?	Audible, 20-Hz-20kHz
Sound waves with higher frequencies than audible are called? What is their frequency?	Ultrasonic, 1-17MHz
Sound waves are transmittable only in ______ &_______, not in ______ or ______.	liquids & solids, air or gas
Why is ultrasound harmless?	Because there is no ionizing of the tissue
Ultrasound can be traced back to when?	WW1
What is sonar?	a technique of sending out sound waves through the water and reading and observing the returning echoes to look for objects
What is A-mode ultrasound?	The first unit built in early 1950's by the Japanese. Anatomy was represented by a series of "blips" on the screen, height was related to the returning echo.
What is B-mode ultrasound?	Japan, US, and Europe developed 2-D gray scale system. Returning echoes represented by varying degrees of gray.
When was real time dynamic introduced?	During the 1970's with the introduction of computers
Who was the first to use doppler? and for what?	Japan, to evaluate vascular structures and blood flow.
When was doppler introduced? and for what?	In the 1980's, color used to evaluate vascular structures and blood flow, speed, and direction.
When were digital systems introduced? And what did it allow?	In the 1990's, convert to digital format, processing, manipulation, viewing, storage, and send images to remote sites.
What does the transducer do?	converts one energy to another. (electrical energy to ultasound energy) sends sound waves and reads them.
The transducer contains a ______ ___ that creates _____ frequency sound when an electrical current is passed through it causing it to ________. Which is called "_________ ____"	ceramic material, high, vibrate. Piezoelectric effect.
What does "Piezoelectric Effect" mean?	pressure electric
Piezoelectric effect describes...	the property of certain crystals expanding and contracting in response to the application of an electric field.
What does using gel do?	it ensures there is no loss of signal, as a result of trapped air between the transducer and the skin.
What is the frequency range of a high frequency transducer? And what type of exams would we use them for?	5-7MHz, small abdomens, necks, vascular
What is the frequency range of a low frequency transducer? And what type of exams would we use them for?	3.5MHZ average to larger abdomens
The reflected sound waves are called?	echoes
Name two barriers in the human body.	Bone & Air
Ultrasound is the gold standard for what exams? (6)	pregnancy, infertility, GYN, gallbladder, carotids, evaluating vascular diseases
What is a dermoid cyst?	cystic teratoma that contains developmentally mature skin complete with hair follicles and sweat glands. Almost always benign.

Created by: Aborys88