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Erschienen in: Breast Cancer 2/2014

01.03.2014 | Original Article

Whole breast irradiation for small-sized breasts after conserving surgery: is the field-in-field technique optimal?

verfasst von: Dae Sik Yang, Jung Ae Lee, Won Sup Yoon, Se Young Chung, Suk Lee, Chul Yong Kim, Young Je Park, Gil Soo Son

Erschienen in: Breast Cancer | Ausgabe 2/2014

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Abstract

Background

To determine the optimal whole breast irradiation technique in patients with small-sized breasts, tangential and field-in-field IMRT (FIF) techniques were compared.

Methods

Sixteen patients with ≤3 cm breast height and ≤350 cc volume were included. Seven patients had 4D CTs performed. The planning target volumes (PTV), editing 5 and 2 mm from the surface on the whole breast, were delineated and called PTV(5) and PTV(2), respectively. Dose–volume histograms of tangential techniques with open beam (OT) and wedge filter (WT), conventional FIF (cFIF), and modified FIF (mFIF) blocking out the lung were produced. Various dose–volume parameters, the dose heterogeneity index (DHtrI), dose homogeneity index (DHmI), and PTV dose improvement (PDI) were calculated.

Results

OT compared with WT showed a significantly favorable V 90 of the heart and lung, and PTV(5)-dose distribution. Comparing OT and cFIF, OT showed significant improvement in the V 95 of PTV(2), whereas cFIF showed significant improvement in the V 95, DHtrI, DHmI, and PDI of the PTV(5). In comparing cFIF and mFIF, mFIF showed improved dose distributions of the heart and lung, while cFIF presented the better V 95, DHtrI, DHmI, and PDI of the PTV(5). Respiratory influences on the absolute dose were mostly within 1 %. The ratio of free breathing and each respiratory phase was similar among OT, cFIF, and mFIF.

Conclusions

cFIF has favorable dose conformity and is suggested to be an optimal method for small-sized breasts. However, OT for dose coverage close to the skin and mFIF for normal tissue may also be potential alternatives. Respiratory effects are minimal.
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Metadaten
Titel
Whole breast irradiation for small-sized breasts after conserving surgery: is the field-in-field technique optimal?
verfasst von
Dae Sik Yang
Jung Ae Lee
Won Sup Yoon
Se Young Chung
Suk Lee
Chul Yong Kim
Young Je Park
Gil Soo Son
Publikationsdatum
01.03.2014
Verlag
Springer Japan
Erschienen in
Breast Cancer / Ausgabe 2/2014
Print ISSN: 1340-6868
Elektronische ISSN: 1880-4233
DOI
https://doi.org/10.1007/s12282-012-0365-y

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