ESTRO 2024 - Abstract Book

S330

Beachytherapy - Physics

ESTRO 2024

3. Subtract curve lagg° from curve DWpositionfr=0°. And as result we will get positions DWpositionfr=0° - lagg° inside applicator (Table). 4. Convert results to Cartesian coordinate (in mm) and compare with library dwell-positions (Table, B) - Mismatch _( DWpositionfr=0° - lagg°)-Library, in mm.

Figure. Mechanical characteristics of the treatment technique components. A – The afterloader cable lagging value (in mm). B - Friction force (in g) to source movement.

Results:

On the table, you can see simulated positions of radiation source in channel1 of Venezia22 brachytherapy applicators and its mismatching with applicator source library positions. Because the starting point of dwell position counting is relative value and can be adjusted, it was done by such way that mismatching for dwell position “300” is minimal, as you can see on the result in table (B).