Surgical Staple Lab Report

Dosimetry parameters seeds of a new source Yb-169 in the form of surgical Staple
Abstract:
Summary: describes the structure of a new seed for brachytherapy practice in cancer patients with the help of a surgical approach that great care to deliver the desired dose distribution to the target cells.
Methods: geometry , source materials, components and environmental Monte Carlo simulation is done. Monte Carlo and the subsequent measurement of doses that are agitated by the foundation springs for Yb-169 this amount is negligible. Yb-169 in the form of a surgical Staple by laser welding titanium tube with an internal diameter is 0.7mm cover in the form of a Staple which legs that is made of titanium to Staple the target tissue.
Conclusion: Ensure
The air kerma was calculated in a 5 cm thick spherical ring of air centrally located at a distance of one meter from the source 90o from the axis of the source. The remainder of the volume of the sphere was vacuum.
The geometry function, G(r,θ), was determined using a simple line source equation with L=0.15cm and G(r0,θ0) = 0.9981313. G(r,θ) was used to normalize the D (r, ) results and determine the remaining
TG-43U1 parameters: Λ, g(r), F(r,θ), ϕan(r), and ϕan . A total of 2×10 source photon histories were processed for each set of in-water and in-air calculations.
The radial dose function is related to the size of the phantom in which the source is located due to the different scatter conditions caused by a lack of backscattered photons at the border of the phantom. To assure “full scatter” conditions, we performed the Monte Carlo simulation of the source in water phantoms with radius of 100 cm. The results of these calculations are shown in Figure 2 and Tables 5 and 6 below.
Because the geometry of the source is not symmetric about the axis of the active element (which is an underlying assumption in TG-43U1), we made an additional simulation to assess the azimuthal anisotropy. Calculations at intervals of 270 degree to 360 degree were
Staple 169Yb with a half-life of 32 days and the initial activity mci2 in permanent planting, almost 43Gy dose delivery anywhere vertically with distance from the source will deliver cm1. Sources implanted may contain more than 5mci (generally mci2 is) the dose Gy140-120 on the sidelines of the cuts will be in a position to cm1- mm8 of sources. [7]
In research conducted by K.L. Leonard et al. calculation results Monte Carlo dose distribution around Staple 169Yb, at the transverse axis 10mm with the results of Monte Carlo I-125 were compared. The results can be seen in Figure 7. Monte Carlo 10mm from Source / staple in the staple legs and the vertical plane that confusion is accentuated by the seed legs. Percent turmoil calculated dose 4 to 5 percent for 169Yb in comparison with I-125, which is about 32% (Figure A7 and B7) both the dose and both measurements suggest that the results of anisotropy 169Yb much better than results I-125 was designed to the same source. [7]
169Yb brachytherapy source and delivery system can be used in conjunction with surgical instruments