Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
26 Cards in this Set
- Front
- Back
|
Removal of photons and electrons from a radiation beam by scatter or absoirption as it travels through a medium. |
Attenuation
|
|
|
Visualization perspective that's "end on" or positioned as if looking at a volume from the source of radiation |
Beam's eye view
|
|
|
Object placed between the patient's teeth to assist in immobilization and to position the tongue |
Bite block |
|
|
Central portion of beam emanating from the target |
Central axis |
|
|
Reproduction of an external body shape |
Contour |
|
|
Based on acquired CT inforrmation, rednder a BEV display of treatment field anatomy of areas of treatment of interest |
DRR |
|
|
Dimensions of a treatment field at the isocenter |
Field size |
|
|
Commonly used method of reconstructeing CT data |
Filtered back projection |
|
|
Numbers that prepresent various tissue densities and linear attenuation coefficeients |
Hounsfield numbers |
|
|
Process where images of the patient are with respect to the isocenter of the accelerator
|
Image registration |
|
|
Process of combining images from different modalities with a CT image |
Image fusion |
|
|
Device that assists in reproducing the treatmentposition while restricting movement |
Immobilization device |
|
|
Point of interesection of 3 axes of rotation |
Isocenter |
|
|
Display of cells in rows and columns |
Image matrix |
|
|
Geometrical definition of the tumor and outlining structures using surface or fiducial marksfor reference |
Localization |
|
|
Devices that place the patient ina particular position for treatment but do not ensure that patient does not move |
Patient positioning aid |
|
|
Used in spiral CT, determined by the couch movement in the longitudinal direction during one rotation of the gantry divided by slice thickness |
Pitch |
|
|
Small, discrete elemetns that make up one image |
Pixel |
|
|
Description of radiation intensity as a function of position across the beam at a given depth |
Profile |
|
|
Process carried out by the therapist under the supervision of the rad onc |
Simulation |
|
|
CT xray tube detector can continue to rotate around the patient without concern of cables becoming tangled. Metal strips carrying electronic signals and power that is swept up by special metal brushes |
Slip rings |
|
|
Volume elements |
Voxel |
|
|
Represents the central Hounsfield unit of all the CT #s within the window width |
Window level |
|
|
Range of #s displayed or the contrast on a CT image
|
Window width |
|
|
Target defined first, then fields determined |
Verification sim |
|
|
Treatment isocenter is located relative to three point setup cordinates on patient's surface |
Triangulation |
