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10 Cards in this Set
- Front
- Back
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beam modification devices
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-blocking
-wedges -compensators -bolus |
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blocking
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-hand blocks
-collimator -cerrobend blocks -MLC -interna shielding (was molds) |
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hand blocks
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-lead blocks 5 HVT thick-various shapes and sizes, not customized to the patient
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cerrobend
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-aka lipowitz metal
-50% bismuth, 26.7% lead, 13.3% tin and 10% cadmium -melts at 70 degrees celsius -to determine thickness of cerrobend needed for blocking, multiply the required lead thickness by 1.21 -most common thicness of cerro is 7.5 cm |
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`positive blocks
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-the block is in the middle of a treatment field (lung block or larynx block)
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negative bocks
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-have an open field in the center and block around the periphery
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MLC leaves are made of
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tungsten alloy
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MLC primary leaf transmission
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less than 2%
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MLC interleaf transmission
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usually less than 3%
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Hinge angle equation
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HA=180- 2WA
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