Evaluation of the Lung Volume Changes in Patients with Breast Cancer Based on the Received Dose in the Upper and Lower Lobes of the Lung

Document Type : Original Article (s)

Authors

1 MSc Student, Department of Medical Physics, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran

2 Professor, Department of Medical Physics, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran

3 Assistance Professor, Department of Radiotherapy Oncology, Seyed Alshohada Hospital, Isfahan University of Medical Sciences, Isfahan, Iran

4 Assistance Professor, Department of Medical Physics, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran

Abstract

Background: The development of pulmonary complications after breast radiotherapy is still controversial. These complications might result in temporary or permanent damage to the lung. The aim of this study was to evaluate changes in the lung volume parameters (LVP) and to assess their relation with mean dose and the percentage of the lung receiving 20 Gy (V20) in the upper and lower lobes of the lung.Methods: Twenty three patients with breast cancer who underwent locoregional radiotherapy were selected. Six thermoluminescence dosimeters (TLDs) were distributed uniformly throughout the chest phantom to assess the accuracy of lung dose was calculated using treatment planning system (TPS). Body plethysmography was performed before, and 3 and 6 months after radiotherapy.Findings: Changes in LVP showed a decrease 3 months, and a slight improvement 6 months after radiotherapy. The mean percentage decrease in LVP was 0.64% and 0.34%for each Gy increase in mean lung dose (MLD) and for each percentage increase of V20, respectively. There was no significant correlation between changes in LVP with respect to age and concurrent hormonal therapy. The minimum and maximum calculation errors of the TPS were 1.8% and 4.2%, respectively.Conclusion: This study showed that changes in LVP, 3 and 6 months after radiotherapy did not cause pulmonary disease, and the TPS dose distribution was reasonably accurate.

Keywords

References

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Journal of Isfahan Medical School
Volume 37, Issue 514 - Serial Number 514
January and February 2019
Pages 60-65

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History

  • Receive Date: 12 December 2018
  • Revise Date: 01 November 2024
  • Accept Date: 06 April 2022

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