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Effect of correction/calibration factors on accuracy of in vivo dose delivery with cylindrical n-type Isorad diode in conventional radiotherapy

Published online by Cambridge University Press:  22 April 2013

Kashif Islam ,
Asdar ul Haque ,
Muzaffar Hussain ,
Sohail Murad ,
Khan Muhammad ,
Asma Ashfaq  and
Atif Islam
Kashif Islam*
Affiliation:
Medical Physics Department, Gujranwala Institute of Nuclear Medicine & Radiotherapy (GINUM), Nizam Pur, Gujranwala, Pakistan
Asdar ul Haque
Affiliation:
Medical Physics Department, Karachi Institute of Nuclear Medicine & Radiotherapy (KIRAN), Karachi, Pakistan
Muzaffar Hussain
Affiliation:
Medical Physics Department, Karachi Institute of Nuclear Medicine & Radiotherapy (KIRAN), Karachi, Pakistan
Sohail Murad
Affiliation:
Radiation Oncology, Gujranwala Institute of Nuclear Medicine & Radiotherapy (GINUM), Gujranwala, Pakistan
Khan Muhammad
Affiliation:
Radiotherapy, Larkana Institute of Nuclear Medicine & Radiotherapy (LINAR), Larkana, Pakistan
Asma Ashfaq
Affiliation:
Clinical Oncology, Services Hospital, Lahore, Pakistan
Atif Islam
Affiliation:
College of Polymer Engineering, Plastics Technology Center, Karachi, Pakistan
*
Correspondence to: Mr Kashif Islam, Head Medical Physics, GINUM, Gujranwala Institute of Nuclear Medicine & Radiotherapy (GINUM), Nizam Pur, Sialkot Road, Gujranwala, Pakistan. Tel: 92-333-8102831; 92-55-3493370-72, ext 3083. Fax: 92-055-3493379. E-mail: Kashif_iislam@hotmail.com
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Abstract

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.

Keywords

bladdercorrection factorlarynxnasopharynxprostatetreatment plan
Type
Original Articles
Information
Journal of Radiotherapy in Practice , Volume 13 , Issue 2 , June 2014 , pp. 180 - 188
Copyright
Copyright © Cambridge University Press 2013 

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