A spreadsheet to determine the volume ratio for target and breast in partial breast irradiation

Kron, T, Willis, D, Miller, J, Hubbard, P, Oliver, M and Chua, B 2009, 'A spreadsheet to determine the volume ratio for target and breast in partial breast irradiation', Australasian Physical and Engineering Sciences in Medicine, vol. 32, no. 2, pp. 98-104.


Document type: Journal Article
Collection: Journal Articles

Title A spreadsheet to determine the volume ratio for target and breast in partial breast irradiation
Author(s) Kron, T
Willis, D
Miller, J
Hubbard, P
Oliver, M
Chua, B
Year 2009
Journal name Australasian Physical and Engineering Sciences in Medicine
Volume number 32
Issue number 2
Start page 98
End page 104
Total pages 7
Publisher Australasian Coll Physical Scientists & Engineers Medicine
Abstract The technical feasibility of Partial Breast Irradiation (PBI) using external beam radiotherapy depends on the ratio between the evaluation planning target volume (PTV-eval) and the whole breast volume ("PBI volume ratio" = PVR). We aimed to develop a simple method to determine PVR using measurements performed at the time of the planning CT scan. A PVR calculation tool was developed using a Microsoft Excel spreadsheet to determine the PTV from three orthogonal dimensions of the seroma cavity and a given margin on the CT scans. The breast volume is estimated from the separation and breast height in five equally spaced CT slices. The PTV-eval and whole breast volume were determined for 29 patients from two centres using the spreadsheet calculation tool and compared to volumes delineated on computerised treatment planning systems. Both the PTV-eval and whole breast volumes were underestimated by approximately 25% using the spreadsheet. The resulting PVRs were 1.05 +/- 0.35 (mean +/- 1SD) times larger than the ones determined from planning. Estimations of the PVR using the calculation tool were achievable in around 5 minutes at the time of CT scanning and allow a prompt decision on the suitability of the patients for PBI.
Subject Medical Physics
Keyword(s) partial breast irradiation
patient selection
contouring
radiotherapy treatment planning
DOI - identifier 10.1007/BF03178635
Copyright notice © 2009 ACPSEM
ISSN 0158-9938
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