Advanced Physics for Brachytherapy 2018

Example for HDR 192 Ir BT source for breast balloon applicator

Category

Optimum level

Assumptions

Source strength

2% PSDL traceable calibrations.

Treatment planning

3% Reference data with the appropriate bin width.

Medium dosimetric corrections

3% Balloon filled with standard level of contrast agent, no consideration or composition of chestwall, lung, or breast.

Scatter dosimetric corrections

7% A non-scalar correction for skin dose is

needed, and will require an advanced dose calculation formalism to properly account for radiation scatter conditions in the patient.

Dose delivery including registration of applicator geometry to anatomy 7% Accurate QA concept for commissioning and

constancy checks, especially for source positioning and applicator/ source path geometry, appropriate imaging techniques (either small slice thickness, 3D sequences or combination of different slice orientations), applicator characterization.

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