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The dose distribution produced by a 32P source for endovascular irradiation
1Department of Radiation Oncology, University of Louisville, Brown Cancer Center, KY 40202, USA.
International Journal of Radiation Oncology, Biology, Physics
|November 1, 1996
Summary
This study demonstrates that a custom 32P wire offers ideal dose distribution for endovascular irradiation, effectively addressing restenosis after coronary angioplasty.
Area of Science:
- Cardiology
- Radiation Oncology
- Biomedical Engineering
Background:
- Restenosis after percutaneous transluminal coronary angioplasty (PTCA) affects 30-50% of patients.
- Endovascular irradiation shows promise in mitigating restenosis.
- Optimizing radiation delivery is crucial for effective treatment.
Purpose of the Study:
- To evaluate a custom-made 32P wire for endovascular irradiation.
- To determine the suitability of the 32P source for treating coronary artery disease restenosis.
Main Methods:
- Dose distribution measurements using LiF thermoluminescent dosimeters and a scintillation detector.
- Characterization of a 3 mm long 32P source (0.414 GBq) encapsulated in a Ni-Ti wire.
- Calculations based on Loevinger's equation for dose distribution.
Main Results:
- Dose rate at 1.5 mm radial distance was 53 cGy/s per GBq.
- Dose decreased exponentially with radial distance.
- Treatment length up to 24 mm achieved with minimal dose variation.
Conclusions:
- The 32P wire exhibits ideal dose distribution for endovascular irradiation.
- The source's characteristics and flexible cable integration are suitable for clinical application.