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Contribution of Magnetic Resonance Imaging in Determining Lumpectomy Cavity in Breast Radiotherapy

Author(s):

Ozlem Demircioglu*, Huseyin Tepetam, Ayfer Ay Eren, Zerrin Ozgen, Fatih Demircioglu and Erkin Aribal  

Abstract:


Background: Accurate localization of the lumpectomy cavity is important for breast cancer radiotherapy after Breast-conserving surgery (BCS). But the LC localization based on CT is often difficult to delineate accurately. To compare CT-defined LC planning to MRI-defined findings in the supine position for higher soft tissue resolution of MRI.

Methods: Fifty-nine breast cancer patient underwent radiotherapy CT planning in supine position followed by MR imaging on the same day. LC was contoured by radiologist and radiation oncologist together from CT and MRI separately. T2 weighted MR images and tomography views were fused and the LC volume, mean diameter and longest axis length were measured after contouring. Subsequently, patients were divided into two groups according to seroma in LC and the above-mentioned parameters were compared.

Results: We didn't find a statistically significant difference in LC volume, mean diameter and length at the longest axis between CT and MRI but according the presence or absence of seroma, statistically significant differences found for the LC volumes and the length at the longest axis of LC volumes.

Conclusion: We believe that the supine MRI in the same position with CT will be more effective for radiotherapy planning particularly in patients without a seroma in the surgical cavity.

Keywords:

Breast Cancer, magnetic resonance, lumpectomy cavity, radiotherapy, fused images

Affiliation:

Department of Radiology, Dr. Abdurrahman Yurtaslan Ankara Oncology Education and Research Hospital , Ankara, Department of Radiation Oncology, Kartal Dr. Lutfi Kirdar Education and Research Hospital, Istanbul, Department of Radiation Oncology, Kartal Dr. Lutfi Kirdar Education and Research Hospital, Istanbul, Department of Radiation Oncology, Marmara University Pendik Education and Research Hospital, Istanbul, Department of Radiation Oncology, Kartal Dr. Lutfi Kirdar Education and Research Hospital, Istanbul, Department of Radiology, Acibadem Mehmet Ali Aydinlar University, Istanbul



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