BJR
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
This Article
Right arrow Figures Only
Right arrow Full Text
Right arrow Full Text (PDF)
Services
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Banjade, D P
Right arrow Articles by Shukri, A
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Banjade, D P
Right arrow Articles by Shukri, A
British Journal of Radiology 75 (2002),812-818 © 2002 The British Institute of Radiology

Full paper

A novel approach of dose mapping using a humanoid breast phantom in radiotherapy

D P Banjade, PhD, AMINSTP 1 B S Ng, BSc, MSc 2 M Zakir, Dip RT 2 A A Tajuddin, PhD 1 and A Shukri, PhD 1

1 School of Physics, Universiti Sains Malaysia, 11800 Penang and 2 Hospital Pantai Mutiara, 82 Jalan Tengah, Bayan Baru, 11900 Penang, Malaysia

Correspondence: D P Banjade, BP Koirala Memorial Cancer Hospital, Bharatpur Chitawan, Nepal

A study of dose mapping techniques to investigate the dose distribution throughout a planned target volume (PTV) in a humanoid breast phantom exposed to a 6 MV photon beam similar to that of treatment conditions is described. For tangential breast irradiation using a 6 MV accelerator beam, the dose is mapped at various locations within the PTV using thermoluminescent dosemeters (TLDs) and radiographic films. An average size perspex breast phantom with the ability to hold the dosemeters was made. TLDs were exposed after packing them in various locations in a particular slice, as planned by the treatment planning system (TPS). To map the dose relative to the isocenter, films were exposed after tightly packing them in between phantom slices, parallel to the central axis of the beam. The dose received at every location was compared with the given dose as generated by the TPS. The mapped dose in each location in the isocentric slice from superficial to deep region was found to be in close agreement with the TPS generated dose to within ±2%. Doses at greater depths and distant medial and lateral ends, however, were found to be lower by as much as 9.4% at some points. The mapped dose towards the superior region and closest inferior region from the isocenter was found to agree with those for TPS. Conversely, results for the farthest inferior region were found to be significantly different with a variance as much as 17.4% at some points, which is believed to be owing to the variation in size and shape of the contour. Results obtained from films confirmed this, showing similar trends in dose mapping. Considering the importance of accurate doses in radiotherapy, evaluating dose distribution using this technique and tool was found to be useful. This provides the opportunity to choose a technique and plan to provide optimum dose delivery for radiotherapy to the breast.






HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
BJR DMFR IMAGING  ALL BIR JOURNALS 
Copyright © 2002 by the British Institute of Radiology.