Implantation and Stability of Metallic Fiducials Within Pulmonary Lesions
- Department of Radiation Oncology, M. D. Anderson Cancer Center Orlando, Orlando, FL (United States)
- Florida State University College of Medicine, Tallahassee, FL (United States)
- Department of Thoracic Surgery, M. D. Anderson Cancer Center Orlando, Orlando, FL (United States)
- Thoracic Care Center, M. D. Anderson Cancer Center Orlando, Orlando, FL (United States)
Purpose: To report and describe implantation techniques and stability of metallic fiducials in lung lesions to be treated with external beam radiotherapy. Methods and Materials: Patients undergoing radiation therapy for small early-stage lung cancer underwent implantation with small metallic markers. Implantation was either transcutaneous under computed tomographic (CT) or fluoroscopic guidance or transbronchial with the superDimension/Bronchus system (radiofrequency signal-based bronchoscopy guidance related to CT images). Results: Implantation was performed transcutaneously in 15 patients and transbronchially in 8 patients. Pneumothorax occurred with eight of the 15 transcutaneous implants, six of which required chest tube placement. None of the patients who underwent transbronchial implantation developed pneumothorax. Successfully inserted markers were all usable during gated image-guided radiotherapy. Marker stability was determined by observing the variation in gross target volume (GTV) centroid relative to the marker on repeated CT scans. Average three-dimensional variation in the GTV center relative to the marker was 2.6 {+-} 1.3 (SD) mm, and the largest variation along any anatomic axis for any patient was <5 mm. Average GTV volume decrease during the observation period was 34% {+-} 23%. Gross tumor volumes do not appear to shrink uniformly about the center of the tumor, but rather the tumor shapes deform substantially throughout treatment. Conclusions: Transbronchial marker placement is less invasive than transcutaneous placement, which is associated with high pneumothorax rates. Although marker geometry can be affected by tumor shrinkage, implanted markers are stable within tumors throughout the treatment duration regardless of implantation method.
- OSTI ID:
- 21039581
- Journal Information:
- International Journal of Radiation Oncology, Biology and Physics, Vol. 69, Issue 3; Other Information: DOI: 10.1016/j.ijrobp.2007.03.040; PII: S0360-3016(07)00554-8; Copyright (c) 2007 Elsevier Science B.V., Amsterdam, Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0360-3016
- Country of Publication:
- United States
- Language:
- English
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