Knobology Flashcards
Determines the strength of the pulse transmitted into the body. Displayed in dB brighter image with stronger pulse.
Power Output
Amplies or boosts the echo signals is done to compensate for attenuation of sound in deeper tissues.
Gain
Amplifies receiver gain gradually at specific depths. Depth of interface is determined by the amount of time it takes for transmitted sound pulse to return to the transducer.
TGC
Allows transducer to focus transmitted sound at different depths. Several focal zones reduce the frame rate.
Focal Zone
Fraunhofer zone
far zone
Frensel zone
near zone
Adjusts the depth and width of an image. Larger or deeper field of view causes frame rate to decrease. Depth is in cm width may be used to reduce side lobe artifacts.
Field of view
Eliminates both electronic noise and low level echoes from the display. Done internally in the computer.
Reject
Range of input signal levels produces noticeable changes in the output of the device.
Dynamic Range
Produces high contrast
Low dynamic range
Produces more shades of gray and lower contrast
High dynamic range
Zoom to increase detail
Zoom
Captures image, must be without motion, patient holding breath
Freeze
Increase PRF decrease PRF
Depth
Color box used, you determine angle of the box.
CF Color Flow Doppler
Cursor and sample volume used, gate (size of sample volume) angle
PW Pulsed wave Doppler
Blind, no image positive/negative flow by sound
CW Continous wave Doppler
Divides image into two screens, rt and lt, you scan placement
L R (Dual Screen)
Calipers used to measure distance, velocity resistivity indexes
Measure
Used for labeling each image, text typing
Comments
“Sets” caliper so additional caliper can be activated for measurements
Set
Can narrow field of view, increases PRF increases image quality
Scan Area
Moves calipers color box sample volume/ cursor, controls zoom box size
Track ball
Sends sound waves at a certain speed and receives double that amount back
Harmonics
Characterature of the body used on image page for location instead of text
Body pattern
Used to measure circular objects HC and AC
Ellipse
M mode and Doppler cursor
M/D cursor
Controls number of and position of focal zones
Focal zone/Depth
Decibles gray scale control increased dB = increased grayscale and vice versa
dB
Programmed soft touch keys
Annotations
Start of new exam new patient enter pt info here
PT ID
Deletes entire word at a time
Word delete
