Module 9 : Knobology Flashcards
characteristic of pre-sets
- used to help more closely optimize an image for the assumed scanning conditions
- POWER, MEASUREMENTS, GETS YOU IN THE NEIGHBORHOOD
what are the different types of transducers
- c 6-2
- L 12-4
- L 18-5
- sector
what is the multi hertz function
- allows you to change frequency of the probe that you are scanning with
- most call it frequency
characteristics of harmonics
- receive the double the fundmental frequency and should most always be on
characteristics of transmit power
- adjust intensity of ultrasound beam transmitted into patient
- increasing intensity could improve the SNR
characteristics of gain
- amplifies all returning echoes during signal processing
- expressed in decibels
characteristics of TGC
- receiver gain that adjusts according to time delay or depth
can gain or TGC improve SNR
no
how is TGC often expressed
- as a slope where an increase in slope is equal to an increase in amplification
characteristics of LGC
- cardiac equipment
- compensate for side to side non uniformities in image brightness due to different pathways
characteristics of focus
- adjusts depth of near field to improve lateral resolution at area of interest
- multiple foci are available but frame rate is reduced
characteristics of depth control
- ability to maximize the field of view
- as depth changes echo information must be redistributed to fit in monitor
- depth influences frame rate and line density
characteristics of dynamic range
- form of compression that reduces number of shades of gray to increase contrast
- can be good or bad
characteristics of freeze
- stops transducer from sending out sound
- machine will continuously write last available Fram to display
characteristics of cine loop
- allows for a number of games to be saved until frozen image is frozen
- ability to evaluate structure frame by frame
characteristics of sector width
- curved linear and echo there is ability to reduce field of view bu firing fewer scan lines
- improve frame rate and spatial resolution
characteristics of dual image
- split screen to show pathology or measurement
characteristics of persistence / frame averaging
- noise reduction by averring individual pixels
- can select number of frames being averages
- increasing Fram averaging reduces frame rate
characteristics of calculations
- different presets come with different calc packages for the measurements needed for that exam
characteristics of zoom
- magnifies the image
what are the two types of zoom
- read and write
characteristics of write zoom
- magnifies image before written to memory
- improved resolution
- GOOD
characteristics of read zoom
- magnifies image after the image is committed to memory
- resolution is lost
- CRAP
characteristics of maps
- redistributing the shades of gray displayed so emphasis is given to particular values
- brighten low level echoic
- can be applied before or after image is frozen
characteristics of video invert
- fluid usually black and tissue shades of gray but this can be switched
characteristics of image invert
- inverted top to bottom or left to right
- can be good during interventional procedures
what is pre/post processing
- pre = anything that can be done to an image before it is captured
- post = applied to image after it is frozen
what are four common doppler controls for color and spectral
- gain
- scale
- steer
- invert
characteristics of compound imaging
- combination of beam steering and frame averaging to improve SNR and eliminate artifacts
characteristics of panoramic imaging
- allows system to store multiple frames of a sweep and display that sweep to demonstrate larger areas of interest
