Ch.8 Flashcards
(28 cards)
What is a transducer in ultrasound?
A transducer is used to obtain an image of the human body using ultrasound and is also referred to as a probe.
What principle does a transducer operate on?
It operates using the pulse-echo principle.
What does the crystal inside the transducer do?
The crystal produces the ultrasound wave once pulsed with electricity.
What is the purpose of acoustic gel in ultrasound?
The gel allows ultrasound waves to pass through the body and acts as a lubricant for ease of transducer manipulation.
What is the importance of transducer orientation?
Proper transducer orientation is essential to obtaining correct anatomic orientation.
What are the types of ultrasound transducers?
Transducers include:
* Linear Sequenced Array Transducer
* Curvilinear Array Transducer
* Linear Phased Array Transducer
What should be done if a crack is found in the transducer housing?
Report it to your supervisor.
Which type of solution can be used for disinfecting intracavity transducers?
A glutaraldehyde-based solution.
What is knobology?
Knobology is the study of knobs or the functionality of controls on ultrasound machines.
What does the acoustic power control do?
It determines the strength of the pulse transmitted into the body.
What is the purpose of annotation keys?
They allow the labeling of the image.
What does the B-color control do?
It colorizes the grayscale of the image.
What does Cine Loop feature do?
It stores the most recent sequence of image frames before the freeze button was pushed.
What is the function of calipers in ultrasound?
Calipers are used as a measuring tool to show measurements on the screen.
How does Color Doppler work?
It assigns a color to movement depending on whether it is moving away from or toward the transducer.
What is the difference between Color Doppler and Power Doppler?
Color Doppler shows direction of flow, while Power Doppler indicates low flow without direction.
What does the Depth control adjust?
It varies the depth to which the echoes are displayed.
What is the purpose of the Dual Image feature?
It allows the display screen to be split to compare normal and abnormal anatomy.
What is the function of the Zoom control?
It magnifies the image by increasing the pixel size.
What does the Time Gain Compensation (TGC) control do?
It compensates for attenuation of the sound beam as it propagates through the tissues.
What is the Trace tool used for?
It allows the user to trace the outline of an area being measured.
What is M-mode used for in ultrasound?
It is used to trace the movements of cardiac tissue.
What is the purpose of the Freeze control?
It starts and stops all display data (real-time image frames).
What does the Caret symbol denote in ultrasound imaging?
It denotes the location of the focal zone on the image.
