WorksheetsBeam modification divices
Total questions: 6
Worksheet time: 3mins
what is cerrobend made of
100 % of lead
Alloy blocks contained 50% bismunt, 26.7% lead, 13.3% tin and 10% candmium
50 % bismunt and 50 % lead
Melting point of cerrobend approximately 70 °C
True
False
What is the magnification factor for the shielding templet if the tray holder at 56cm and the image intensifier at 140cm
0.25
0.56
0.4
Now shielding blocks was replace by
MULTI LEAF COLLIMOTOR
WEDGE
BOLUS
Beam modfication defined as desirable modification in the spatial distribution of radiation within the patient - by insertion of any material in the beam path
False
True
Why shielding is needed in radiotherapy
To eliminate radiotherapy dose to some special parts of the zone at which the beam is directed
To get homogeneous isodose curve
To avoid hot and cold sport.
