Dose Course 2018_Flipping book

4. Absorbed dose calculation

• For each voxel and particle type, there is one transport equation for each direction and energy interval, in Acuros • NxNxN voxels (3.6E4 – 1E6 for a one litre volume) • D discrete angles (32 – 512 ) • E energy intervals (25 for photons, 49 for electrons)

3 ∙ ∙

⇒

2 ∙

no. of equations:

• Iterative solution • Yields at each point • Absorbed dose is calculated as: , , ,

∞

= න

න 4

( , )

, ,

water or medium