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Published on: July 3, 2014
The Relationship between Lung and Heart Two-Dimensional Parameters and Three-Dimensional Dose-Volume Data in Adjuvant
Pedram Fadavi1, Arezoo Mehrabian1, Soraya Salmanian1
1Department of Radiation Oncology, School of Medicine, Iran University of Medical Sciences, Tehran, Iran.
Two-dimensional (2D) radiographic parameters like central lung distance (CLD) and maximum heart distance (MHD) correlate with heart and lung radiation doses in breast cancer patients undergoing adjuvant radiotherapy. MHD closely estimates heart dose-volume parameters, aiding in complication reduction.
Area of Science:
- Medical Physics
- Radiation Oncology
- Radiology
Background:
- Two-dimensional (2D) radiographic parameters are utilized to estimate heart and lung radiation exposure in breast cancer patients.
- Minimizing cardiac and pulmonary complications is a critical goal in adjuvant radiotherapy for breast cancer.
Purpose of the Study:
- To investigate the correlation between established 2D radiographic parameters and dose-volume parameters.
- To assess the utility of 2D parameters in predicting radiation dose to the heart and lungs during breast cancer radiotherapy.
Main Methods:
- A cross-sectional study analyzed 121 female patients treated with breast-conserving surgery (BCS) or modified radical mastectomy (MRM) and 3D conformal radiotherapy (3DCRT).
- Measurements included central lung distance (CLD), maximum lung depth (MLD), maximum heart length (MHL), maximum heart distance (MHD), and chest wall separation (CWS).
- Pearson correlation tested the relationship between 2D parameters and dose-volume histograms (DVHs) for the lung, heart, and target volumes.
Main Results:
- Correlations were found between CLD and ipsilateral lung V5-20Gy and Dmean, and between MLD and ipsilateral lung V5-20Gy.
- Moderate correlations were observed for CLD and MLD with ipsilateral lung V20Gy in the two-field radiotherapy (2FRT) technique.
- Maximum heart distance (MHD) showed a strong correlation with heart dose-volume parameters (V5-25Gy and Dmean) in the 2FRT group.
Conclusions:
- 2D radiographic parameters, specifically CLD, MLD, and MHD, demonstrate a correlation with heart and lung dose-volume parameters in adjuvant breast radiotherapy.
- CLD correlates with lung dose-volume parameters, particularly V20Gy.
- MHD provides a reliable estimation of heart dose-volume parameters, aiding in treatment planning to minimize cardiac toxicity.
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