Term
|
Definition
| patient receives exposure and exit radiation hits the IP |
|
|
Term
|
Definition
| radiation excites electrons in the photostimulable phospor plate (PSP) |
|
|
Term
|
Definition
| the conductive layer of the IP traps the electrons in "phosphor centers" in a pattern representing the anatomy and the intesity of the radiation striking the IP at each phosphor center or pixel |
|
|
Term
| the number of pixels determines |
|
Definition
| the resolution of the image (the higher the number, the better the detail or resolution of the image) |
|
|
Term
|
Definition
| this is the "latent image" and remains on the IP until it is read. this hsould be as soon as possible because this is a metastable state and will not last for a long period of time |
|
|
Term
|
Definition
| the IP is inserted in to the reader where a re laser scans it in a zig-zag "raster" pattern. The laser releases the trapped electrons. As they are released, the give off "blue light" in an inteity corresponding to the amount of radiation recieved |
|
|
Term
|
Definition
| the light intesity is detected by a photomultiplier tube which converts the light in to an electronic signal which is in analog form |
|
|
Term
|
Definition
| the analog signal is then converted to a digital signal by the analog-to-digital converter |
|
|
Term
|
Definition
| this digital information cannow be manipulated by the computer using correctly selected algorithms based on the part selected and using Look-up tables (LUT) to do histogram |
|
|
Term
|
Definition
| the image is now visible and can be further manipulated tochange brightness and contrast as needed |
|
|
Term
|
Definition
| finally the IP is erased using a bright white light so that any remaining trapped electrons will be released and the IP can be re-used |
|
|
