Rigid Bolus
For smaller areas which do not require the bolus to be moulded over the skin, Perspex can be used. The use of Perspex bolus is advantageous for electron set-ups because it is transparent. Since the f.s.d, for most electron fields is 95 cm, so that the movements of the couch are not isocentric, inaccuracies may arise for aligning angled fields when opaque bolus is inserted.
Read more about this topic: Bolus (radiation Therapy)
Famous quotes containing the word rigid:
“It is the custom of the Roman Church which I unworthily serve with the help of God, to tolerate some things, to turn a blind eye to some, following the spirit of discretion rather than the rigid letter of the law.”
—Pope Gregory VII (c. 1020–1085)