Brachytherapy manual calculation

the four sources and comparison with manual calculations was done with the help of source data (table 4). CCX For manual brachytherapy µ Gy/h at 5 cm from the surface And 20 µGy/h at cm from the surface CCB CCZ COB Table 2. Brachytherapy Dose Calculation (i.e. since ) • TG43 formalism is the standard methodology for dose calculation. • TG43 was created primarily for interstitial low energy brachytherapy purposes. • Dose calculation is done assuming material is . IX. LOW DOSE RATE BRACHYTHERAPY QUALITY ASSURANCE A. General Aspects of LDR Brachytherapy Quality Assurance 1. Positional Accuracy 2. Accuracy of Source Strength 3. Temporal Accuracy 4. Radiation Safety 5. Dose Calculation Accuracy B. Commissioning, Acceptance Testing and Annual Review 1. Intracavitary Sources 2. Applicators 3. Dummy .

Purposes of Brachytherapy Treatment Planning • To determine optimal source strengths/dwell times and source distribution and loading patterns -LDR and HDR pre-implant plans • To document isodose distribution, target and critical organ doses • To serve as guidance to future patient management -Post-implant prostate dosimetry plans, multi-. Brachytherapy dose calculations are steeped in tradition, and when TG was convened, the majority of clinical I and Ir seed implants were being calculated with point source dose models. One issue addressed by the Task Group was to recommend how clinical brachytherapy dose calcula-tions should take into account the 2-D properties of. Brachytherapy Dose Calculation (i.e. since ) • TG43 formalism is the standard methodology for dose calculation. • TG43 was created primarily for interstitial low energy brachytherapy purposes. • Dose calculation is done assuming material is uniform water phantom.

A Computer Program for Second Physics Manual Calculations in HDR Brachytherapy The dose calculation used in the code is based on the TG [2] formalism, where the dose rate at distance r is given by. Λ φ. Sources are assumed to be “point sources”. The anisotropy function, φ(r), is assumed to be constant and equal to 1. Brachytherapy treatment outcome is affected by: • Particular model used for source distribution in the target volume. • Algorithm used for calculation of dose distribution. • Methods used for the determination of the source strength. • Dose rate and prescribed dose used in treatment. The first step in any Brachytherapy treatment will be to determine, and/or verify, the actual source strength or activity on the day the source is received at the clinic, and calculate what it will be at the time of the implant. This is accomplished with the decay equation: Activity (implant day) = A (manufacturer assay day) exp (-(In(2))(t/:)τ.