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Comparison of breast sequential and simultaneous integrated boost using the biologically effective dose volume histogram (BEDVH)

Aly, Moamen M. O. M. ; Abo-Madyan, Yasser ; Jahnke, Lennart ; Wenz, Frederik ; Glatting, Gerhard

In: Radiation Oncology, 11 (2016), Nr. 16. pp. 1-7. ISSN 1748-717X

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Download (2MB) | Lizenz: Creative Commons LizenzvertragComparison of breast sequential and simultaneous integrated boost using the biologically effective dose volume histogram (BEDVH) by Aly, Moamen M. O. M. ; Abo-Madyan, Yasser ; Jahnke, Lennart ; Wenz, Frederik ; Glatting, Gerhard underlies the terms of Creative Commons Attribution 3.0 Germany

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Abstract

Purpose: A method is presented to radiobiologically compare sequential (SEQ) and simultaneously integrated boost (SIB) breast radiotherapy. Methods: The method is based on identically prescribed biologically effective dose (iso-BED) which was achieved by different prescribed doses due to different fractionation schemes. It is performed by converting the calculated three-dimensional dose distribution to the corresponding BED distribution taking into consideration the different number of fractions for generic α/β ratios. A cumulative BED volume histogram (BEDVH) is then derived from the BED distribution and is compared for the two delivery schemes. Ten breast cancer patients (4 right-sided and 6 left-sided) were investigated. Two tangential intensity modulated whole breast beams with two other oblique (with different gantry angles) beams for the boost volume were used. The boost and the breast target volumes with either α/β = 10 or 3 Gy, and ipsi-lateral and contra-lateral lungs, heart, and contra-lateral breast as organs at risk (OARs) with α/β = 3 Gy were compared. Results: Based on the BEDVH comparisons, the use of SIB reduced the biological breast mean dose by about 3%, the ipsi-lateral lung and heart by about 10%, and contra-lateral breast and lung by about 7%. Conclusion: BED based comparisons should always be used in comparing plans that have different fraction sizes. SIB schemes are dosimetrically more advantageous than SEQ in breast target volume and OARs for equal prescribed BEDs for breast and boost.

Item Type: Article
Journal or Publication Title: Radiation Oncology
Volume: 11
Number: 16
Publisher: BioMed Central
Place of Publication: London
Date Deposited: 01 Mar 2016 08:07
Date: 2016
ISSN: 1748-717X
Page Range: pp. 1-7
Faculties / Institutes: Medizinische Fakultät Mannheim > Institut für Klinische Radiologie
Medizinische Fakultät Mannheim > Klinik für Strahlentherapie und Radioonkologie
Subjects: 610 Medical sciences Medicine
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