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Calculation of the 3-D dose distribution surrounding a 103Pd stent
L B McLemore1, J L Horton, J A Antolak
1Department of Radiation Physics, The University of Texas M.D. Anderson Cancer Center, 1515 Holcombe Boulevard, Houston, TX 77030, USA.
Purpose:
This study was designed to assess the suitability of a 103Pd-implanted stent for use in intravascular brachytherapy.
Materials And Methods:
A stent was modeled as a superposition of 201 identical struts and the EGS4/DOSRZ Monte Carlo code was used to calculate the dose distribution for each strut. To verify the simulation parameters, doses along the transverse axis of a Model 200 103Pd interstitial seed were calculated and compared to those calculated by the TG43 method.
Results:
Dose profiles within 1 mm of the stent's outer surface were heterogeneous and reflected the stent's structure. For a 2-mm outer-diameter 103Pd-implanted stent, approximately 2.68 x 10(7) Bq were required to deliver 31.5 Gy in 28 days at a distance of 0.5 mm along the perpendicular bisector from the stent's outer surface. The Monte Carlo simulation of the 103Pd seed showed relative doses within 7% of the values calculated by the TG43 method.
Conclusion:
The dosimetry about a 103Pd-implanted stent suggests that the stent is suitable for use in intravascular brachytherapy.
