Lecture #12 (Ultrasound) Flashcards
1
Q
What type of energy is ultrasound?
A
Acoustic energy.
2
Q
What is the definition of ultrasound?
A
Inaudible, acoustic vibrations of high frequency that produce thermal effects.
3
Q
What type of modality has ultrasound traditionally been classified as?
A
Deep heating (but it also has non-thermal effects)
4
Q
At what frequency is sound not audible?
A
20,000 Hz
5
Q
What is a Hertz (Hz)?
A
Cycles per second
6
Q
What frequency do we use for ultrasound?
A
Megahertz (MHz) –(
7
Q
What is acoustic impedance?
A
The amount of ultrasonic reflection.
8
Q
What is the order of body tissues from less to most acoustic impedance?
A
Water
Fat
Bone
Air
