title: Water bag bolus in external air cavities to produce dose homogeneity.
abstract: High energy photon beams traversing large iatrogenic air cavities can lead to surface underdosage and overdosage because of high exit dose. A water bag bolus in such external cavities is a remarkably simple and reproducible means of producing dosage homogeneity.
mesh_terms: D000293:Adolescent; D005134:Eye Neoplasms / Q000473:pathology / Q000532:radiotherapy* / Q000601:surgery; D005260:Female; D006801:Humans; D008437:Maxilla / Q000473:pathology / Q000528:radiation effects; D008441:Maxillary Neoplasms / Q000532:radiotherapy; D009364:Neoplasm Recurrence, Local; D009666:Nose / Q000473:pathology / Q000528:radiation effects; D009915:Orbit / Q000473:pathology / Q000528:radiation effects; D011878:Radiotherapy / Q000009:adverse effects / Q000379:methods*; D012175:Retinoblastoma / Q000473:pathology / Q000532:radiotherapy* / Q000601:surgery