Positioning Bolus in The Treatment Beam
To ensure that the required dose is received by the patient, bolus of the right thickness must be placed correctly. Therefore bolus requirements must be clearly documented in the set up sheets of the treatment card. When using bolus to compensate for missing tissue, the whole of the bolussed area must be level with the point on the patient where the f.s.d. is set, to ensure dose homogeneity.
When the bolus is used to reduce the skin-sparing effect, the bolus does not necessarily need to touch the skin all over the bolussed area as the scatter is of sufficiently high energy to be unaffected by an air gap. However, it is important that the bolus is uniform thickness. Some bolus materials are easily squashed and must be carefully measured at regular intervals.
Read more about this topic: Bolus (radiation Therapy)
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