Ultrasound Measurement Tools
-The tool is similar to a hypodermic needle with a tiny PZT material attached to the end
- It measures acoustic pressure at specific locations within the sound beam.
A. Oscilloscope
B. Acousto-optics
C. Hydrophone
D.Thermocouple
C. Hydrophone
What is the core body temp?
37 degrees celsius
Research done inside a living organism is called?
in Vivo
True or False
It is okay to still use a transducer if the wire is exposed BUT the case is still intact.
False
____ is exerted by a sound beam on tissues... force a sound beam creates when hitting a target/issue
A. stable cavitation
B. mechanical index
C. transient cavitation
D. radiation force
D. radiation force
This device uses temperature change to calculate the total power of the entire sound beam
A. Calorimeter
B.Thermocouple
C. Oscilloscope
D. Hydrophone
A. Calorimeter
True or False
Adult tissues are LESS tolerant of tissue heating than fetal/neonatal tissue.
False
True or false
The empirical research method focuses on identifying cause and effect mechanisms.
False.
Mechanistic approach
What does ALARA stand for?
As low as reasonably achievable
Most of the sound energy that enters the body during ultrasound...
A. excreted through waste
B. remains in the body
C. exhaled out
B. remains in the body
This temperature-sensitive material changes color when struck by a sound beam.
A. thermocouple
B. Calorimeter
C. Hydrophone
D. Liquid crystal
D. Liquid crystal
Is tissue heating greater in bone or soft tissue?
A. Bone
B. Soft tissue
C. Neither, they're both equal.
A. Bone
Is this an example of in Vivo or in Vitro?
A computer model estimating the temp elevation of tissues during exposure to ultrasound
In Vitro
Your pregnant coworker complains of abdominal pain, and she asks you to scan her to check on the baby without a medical order. Is it okay to scan her? Why?
No, It is not appropriate. There must be a physician's order to do a scan. ALARA.
What allows us to view the shape of a sound beam in a medium?
A. Schlieren
B. Calorimeter
C. PZT crystal
D. Pulser
A. Schlieren
What does the Hydrophone measure?
-4 things
-period
-PRP
-PRF
-PD
Bioeffects can occur when the tissue heats up _ to _ higher than the core body temp.
2 to 4 degrees
What are the techniques used to study bioeffects?
mechanistic approach
empirical approach
True or False
Transducer output is the HIGHEST when preforming gray scale imaging
False.
Acousto-optics is based on the interaction between __ and ___
sound and light
Name the 3 devices that measure the output of ultrasound transducers by absorption.
calorimeter
thermocouple
liquid crystal
What two sound wave characteristics is Mechanical index related to?
peak rarefraction pressure
lower frequency
This approach searches for relationship between exposure and response
Empirical approach
What is the primary determinant of patient exposure?
exam time
This term describes a region where no sound reflections occur
Free field conditions