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Intraoperative Radiotherapy With INTRABEAM: Technical and Dosimetric Considerations
Anil Sethi1, Bahman Emami1, William Small1
1Loyola University Medical Center, Maywood, IL, United States.
Frontiers in Oncology
|April 11, 2018
Summary
This study evaluates intraoperative radiotherapy (IORT) applicators, recommending optimal use for specific sites. Proper applicator selection ensures safe, effective, and efficient IORT delivery with improved target dose coverage and reduced normal tissue exposure.
Area of Science:
- Medical Physics
- Radiation Oncology
- Surgical Oncology
Background:
- Intraoperative radiotherapy (IORT) offers targeted radiation delivery during surgery.
- Treatment accessories, or applicators, are crucial for precise dose distribution in IORT.
- Understanding applicator characteristics is vital for optimizing clinical outcomes.
Purpose of the Study:
- To evaluate dose characteristics and clinical applications of IORT treatment accessories.
- To provide site-specific recommendations for the optimal use of IORT applicators.
- To assess the impact of applicator design on dose distributions.
Main Methods:
- Dose measurements using a low-energy (50 kV) X-ray INTRABEAM source.
- Evaluation of spherical, flat, surface, and needle applicators.
- Measurement of depth-dose profiles, surface dose, output factors, and target dose homogeneity using films and ionization chambers.
Main Results:
- Different applicators are suited for specific anatomical sites (e.g., spherical for breast lumpectomy, flat/surface for head/neck/abdomen/pelvis, needle for spinal metastasis).
- Larger applicators generally yield more homogeneous target doses and lower surface doses.
- Dose rates varied significantly among applicator types, with needle applicators showing the highest dose rate.
Conclusions:
- IORT delivery is feasible with various site-specific applicators.
- Appropriate applicator selection is essential for safe, effective, and efficient IORT.
- This study aids clinicians in optimizing target dose coverage and minimizing normal tissue exposure.
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