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Physics Module 3
Vocabulary
| Term | Definition |
|---|---|
| transmitter | Modifies the electrical current (from the outlet) and can produce electrical waveforms of variable amplitudes and frequencies to drive the various transducers used |
| pulser | The pulser controls the electrical signals sent to the piezoelectric crystals and determines PRF, PRP, pulse amplitude, pulse duration |
| beam former | pulser in phased array systems |
| receiver | component of the ultrasound system that detects, receives, and processes the echo voltage signals |
| detection & reception | detects the raw RF signals and sends them through a processing chain |
| amplification | amplifies all RF signals equally |
| compensation | Compensates for attenuation |
| compression | decreases the difference between the smallest amplitude and the largest amplitude |
| dynamic range | range of echo signal amplitudes that can be processed by a component of the ultrasound system |
| demodulation | changes the echo signal from an RF signal to a video signal that can be displayed; aka rectification & smoothing |
| rejection | Also called Suppression, Reject, Threshold or Filter - rejects all echo signal components that fall below a certain adjustable level (or threshold). |
| signal to noise ratio | Specifies the signal quality |
| scan converter | the memory of the ultrasound system |
| display | the monitor of the ultrasound system |
| storage | external storage of ultrasound information (paper, CD’s, film, PACS) |
| master synchronizer | the computer (CPU Board) or brain of the ultrasound system |
| power | the rate at which energy is transferred |
| intensity | the concentration of power per unit area |
| cathode ray tube | a high-vacuum tube in which cathode rays produce a luminous image on a fluorescent screen, used chiefly in televisions and computer terminals |
| liquid crystal display (LCD) | the technology used for displays in notebook and other smaller computers |
| A-mode | amplitude mode, shows the strength of the returning echo as a spike |
| B-mode | brightness mode, shows the strength of the returning echo as a bright spot |
| C-mode | constant depth mode, shows blood flow velocity over time |
| M-mode | motion mode, shows motion over time |
| volumetric scanning | acquires and displays information in the elevation dimension |
| voxel | 3-D picture element (pixel) with a length, width, and thickness |
| scan conversion | the ability to convert from a-mode signals to b-mode signals |
| B-scan | a compilation of b-mode lines |
| real-time imaging | the production of a series of images that are displayed in a rapid sequence creating the impression of continuous motion |
| raster scan | |
| interlaced | |
| non-interlaced | |
| bistable | |
| gray scale display | |
| digital scan converter | |
| scanning speed limitation | |
| composite time | |
| line density | |
| persistence | |
| parallel processing | |
| compound imaging or crossbeam | |
| panoramic imaging | |
| spatial resolution | |
| contrast resolution | |
| signal compression | |
| signal to noise ration (SNR) | |
| frame averaging | |
| spatial averaging | |
| analog to digital conversion | |
| preprocessing | |
| postprocessing | |
| digital to analog conversion | |
| binary | |
| decimal | |
| bit | |
| byte | |
| random access memory (RAM) | |
| freeze frame | |
| cine loop | |
| zoom or magnification | |
| write (acoustic) zoom | |
| read (non-acoustic) zoom | |
| region of interest (ROI) | |
| tissue colorization | |
| trace or ellipse tool | |
| speckle tracking | |
| hard copy film | |
| thermal printer | |
| laser imager | high-resolution multi-format films directly from diagnostic radiology procedures image data |
| PACS | Picture Archiving and Communication Systems |
| teleradiology | the electronic transfer of images and reports from one location to another |
| transmitter | |
| pulser | |
| beam former | |
| receiver | detection & reception |
| detection & reception | |
| amplification | |
| compensation | |
| compression | |
| dynamic range | |
| demodulation | |
| rejection | |
| signal to noise ratio (SNR) | |
| scan converter | display |
| display | |
| storage | |
| master synchronizer | |
| power | the rate at which energy is transferred |
| intensity | the concentration of power per unit area |
Created by:
ginaliane
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