Reproducibility of field alignment in radiation therapy. A large-scale clinical experience.
A specially designed cassette which gives an excellent quality of portal films has been used to determine the set-up accuracy and uncertainties in treatment alignment during full-course radiation therapy on patients treated for some common malignant diseases. An analysis of a comparison between simulator films and portal films is also presented. For various diagnoses treatment-to-treatment positioning varied with an average standard deviation of 3.5 mm despite the use of laser alignment and good patient fixation.
Kihlén
B
B
Department of Oncology, Radiumhemmet, Stockholm, Sweden.
Rudén
B I
BI
D005260:Female; D006801:Humans; D008297:Male; D011786:Quality Control; D011878:Radiotherapy / Q000379:methods*