TY - JOUR
T1 - Effect of correction/calibration factors on accuracy of in vivo dose delivery with cylindrical n-type Isorad diode in conventional radiotherapy
AU - Islam, Kashif
AU - Ul Haque, Asdar
AU - Hussain, Muzaffar
AU - Murad, Sohail
AU - Muhammad, Khan
AU - Ashfaq, Asma
AU - Islam, Atif
PY - 2014/6
Y1 - 2014/6
N2 - Purpose The main aim was to use pre-calculated correction factors and calibration factors for measurement of accuracy of dose delivery before implementation of such in vivo dosimetry on real patients visiting for first radiation treatment. These factors were verified by generating the most common treatment plans on human phantom except for breast and colon using cobalt-60 unit. Materials and methods Six treatment plans were generated, i.e. nasopharynx, bladder, prostate, brain, larynx and lung of human phantom, total 18 fields were planned keeping in view the correction factors which are to be verified. MULTIDATA Decision Support System 2.5, Shimadzu simulator, Isorad diode-n type, electrometer patient dose monitor and ATOM Adult male human phantom were used. Results and conclusion For 18 fields, the dose delivery was accurate in the range 0·29-6·74%. The deviation between measured and expected doses to nasopharynx, lung, bladder, prostate, brain and larynx cases of human phantom ranged from 1·44-3·89%, 0·29-0·54%, 0·44-6·18%, 0·54-5·16%, 0·33-4·90%, 5·58-6·74%, respectively. In 30 palliative patient cases, the first radiation treatment was also monitored. The accuracy of dosimety ranged from 1·05% to 5·35%. This study is helpful to identify areas of improvement in treatment of patients like quality control/quality assurance (QA) of treatment planning system, beam data modifications, machine repair maintenance, QA audit in radiotherapy.
AB - Purpose The main aim was to use pre-calculated correction factors and calibration factors for measurement of accuracy of dose delivery before implementation of such in vivo dosimetry on real patients visiting for first radiation treatment. These factors were verified by generating the most common treatment plans on human phantom except for breast and colon using cobalt-60 unit. Materials and methods Six treatment plans were generated, i.e. nasopharynx, bladder, prostate, brain, larynx and lung of human phantom, total 18 fields were planned keeping in view the correction factors which are to be verified. MULTIDATA Decision Support System 2.5, Shimadzu simulator, Isorad diode-n type, electrometer patient dose monitor and ATOM Adult male human phantom were used. Results and conclusion For 18 fields, the dose delivery was accurate in the range 0·29-6·74%. The deviation between measured and expected doses to nasopharynx, lung, bladder, prostate, brain and larynx cases of human phantom ranged from 1·44-3·89%, 0·29-0·54%, 0·44-6·18%, 0·54-5·16%, 0·33-4·90%, 5·58-6·74%, respectively. In 30 palliative patient cases, the first radiation treatment was also monitored. The accuracy of dosimety ranged from 1·05% to 5·35%. This study is helpful to identify areas of improvement in treatment of patients like quality control/quality assurance (QA) of treatment planning system, beam data modifications, machine repair maintenance, QA audit in radiotherapy.
KW - bladder
KW - correction factor
KW - larynx
KW - nasopharynx
KW - prostate
KW - treatment plan
UR - http://www.scopus.com/inward/record.url?scp=84899738575&partnerID=8YFLogxK
U2 - 10.1017/S1460396913000095
DO - 10.1017/S1460396913000095
M3 - Article
AN - SCOPUS:84899738575
VL - 13
SP - 180
EP - 188
JO - Journal of Radiotherapy in Practice
JF - Journal of Radiotherapy in Practice
SN - 1460-3969
IS - 2
ER -