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Tumor localization using fundus view photography for episcleral plaque therapy
M D Evans1, M A Astrahan, R Bate
1Medical Physics Unit, McGill University, Montreal, Canada.
Medical Physics
|May 1, 1993
Summary
Accurate localization of ophthalmic tumors using CT and digital imaging improves radiation dose calculations for episcleral I-125 plaque brachytherapy. This new computer program enhances precision for tumors near critical eye structures.
Area of Science:
- Ophthalmology
- Medical Physics
- Radiation Oncology
Background:
- Accurate localization of ophthalmic tumors on the scleral surface is crucial for radiation dose calculation in episcleral I-125 plaque brachytherapy.
- Tumors near the fovea or optic nerve require precise localization to minimize damage to adjacent structures.
- Current methods using hand-drawn fundus diagrams lack inherent accuracy for physical measurements.
Purpose of the Study:
- To develop and evaluate a computer planning program for estimating the size and location of posterior ophthalmic tumors.
- To improve the accuracy of tumor localization compared to traditional methods.
Main Methods:
- Development of a computer planning program utilizing computed tomography (CT) and a digitized photographic montage of the posterior hemisphere.
- Construction of a simple phantom to test the software's accuracy.
- Direct comparison of planned versus measured tumor size and location in an excised eye.
Main Results:
- The computer planning program demonstrated the ability to estimate the size and location of posteriorly located tumors.
- Testing in an excised eye showed a direct comparison between planned and measured tumor dimensions and positions.
Conclusions:
- A computer-based approach using CT and digital imaging offers a more accurate method for localizing ophthalmic tumors.
- This technology has the potential to improve radiation dose planning for ophthalmic plaque brachytherapy, especially for tumors near critical structures.