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20 Cards in this Set
- Front
- Back
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beam restricting devices
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made of 2-3mm of lead, the diaphragms define both the size and the axis of the x-ray beam
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beam's eye views (BEVs)
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a visualization perspective that is "end-on" or positioned as if looking at a volume from the source
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becquerel (Bq)
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SI unit of radioactivity that equals 1 disintegration per minute
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bending magnet
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used in high-energy linear accelerators to bend the electron stream w/in the head of the gantry
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beneficence
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the doing or producing of good
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benign
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tumors that are generally well differentiated and do not metastasize or invade surrounding normal tissue
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bengin prostatic hypertrophy (BPH)
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an enlargement of the prostate gland common in men older than 50
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beta particle
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electrons or positrons emitted during nuclear decay
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betatron
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a megavoltatage unit that can provide xray and e- therapy beams from less than 6 to more than 40meV
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bimodal
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occuring w/in two peaks of incidence
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biopsy
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the surgical removal of a small tissue sample from a solid tumor to determine the pathology for the diagnosis of disease
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bite block
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an object placed between the pt's teeth to asist in immobilization of the tongue
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bitemporal hemianopsia
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the loss of peripheral vision
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blocked field size
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the equivalent rectangular field dimensions of the open treated area w/in the collimated dimensions
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(BBB) blood-brain barrier
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the barrier system that hinders the penetration of some substances into the brain and CSF
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body cavities
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the spaces within the body that contain internal organs
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body habitus
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the physique of the human body. the internal anatomy of a person varies with the physique
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bohr atom
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model states that the e- surrounding the nucleus exists only in certain energy states or orbits, and when an e- moves from one orbit to another
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bolus
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tissue equivalent material that is usually placed on the pt to increase the skin dose
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boost fields
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fields that are used to deliver a high dose to a small volume
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