Selective in vivo dosimetry in radiotherapy using P-type semiconductor diodes: a reliable quality assurance procedure.
Since 1994, our center has conducted entrance dose measurements on selected patients receiving 6MV x-ray therapy by utilizing a commercial set of p-type semiconductor diodes. We report on three years results representing 386 patients having 1005 measurements and the usefulness of such a system in a radiotherapy department. The 386 patients represent approximately 20% of our total radical treatments. Minimal disruption to patient treatment was achieved. Measurements showed an average variation from expected dose of 0.5% +/- 2.2%. Specific treatment site groups were investigated. Our results show that in vivo dosimetry on a selected group of patients is an effective method of providing an independent verification of dose delivery accuracy.
Howlett
S
S
Newcastle Mater Misericordiae Hospital, Department of Radiation Oncology, Hunter Region Mail Center, NSW 2310, Australia.
Duggan
L
L
Bazley
S
S
Kron
T
T
D006801:Humans; D011785:Quality Assurance, Health Care; D011874:Radiometry; D011879:Radiotherapy Dosage; D011882:Radiotherapy, High-Energy / Q000295:instrumentation / Q000379:methods / Q000592:standards*