Clinical results of entrance dose in vivo dosimetry for high energy photons in external beam radiotherapy using MOSFETs.
Thomson and Nielsen TN-502 RD MOSFETs were used for entrance dose in vivo dosimetry for 6 and 10 MV photons. A total of 24 patients were tested, 10 breast, 8 prostate, 5 lung and 1 head and neck. For prostates three fields were checked. For all other plans all fields were checked. An action threshold of 8% was set for any one field and 5% for all fields combined. The total number of fields tested was 56, with a mean discrepancy of 1.4% and S.D. of 2.6%. Breasts had a mean discrepancy of 1.8% and S.D. of 2.8%. Prostates had a mean discrepancy of 1.3% and S.D. of 2.9%. For 3 fields combined, prostates had a mean of 1.3% and S.D. of 1.8%. These results are similar to results obtained with diodes and TLDs for the same techniques.
Morton
J P
JP
Department of Physics IT and Engineering, Adelaide Radiotherapy Centre, Adelaide, Australia. jmorton@adradcentre.com.au
Bhat
M
M
Williams
T
T
Kovendy
A
A
D055592:Biophysical Phenomena; D001703:Biophysics; D005260:Female; D006801:Humans; D008297:Male; D009369:Neoplasms / Q000532:radiotherapy; D019047:Phantoms, Imaging; D017785:Photons / Q000627:therapeutic use; D019736:Prostheses and Implants; D011874:Radiometry / Q000295:instrumentation*; D011879:Radiotherapy Dosage; D011880:Radiotherapy Planning, Computer-Assisted; D020266:Radiotherapy, Conformal; D011882:Radiotherapy, High-Energy