Hadron treatment planning with adequate biological weighting
Treatment planning methods are provided that determine the variability of relative biological effectiveness (RBE) along a beam line and calculate, among other things, what intensity of hadron beam such as a proton or a carbon ion beam should be applied to achieve a desired biological dose at treatment site of a patient afflicted with a medical condition. Typically, three or four RBE values at three or four corresponding spacially-dispersed intervals along the beam line are calculated. In one embodiment, two RBE values for the spread-out Bragg peak (SOBP) region of the treatment site; one for the proximal section and one for the declining distal section is calculated. A third and different RBE value may be determined for the distal edge region of the SOBP. A fourth value may also be calculated for a pre-SOBP region.
1. A method of treatment planning for delivering a biological dose at a treatment site of a patient, the method comprising the steps of:
receiving geometric parameters that describes a site under treatment;
determining a variability of relative biological effectiveness (RBE) along a plurality of hadron beams based on the received parameters, wherein RBE is a ratio of a dose of reference radiation to a hadron dose required to achieve an equivalent biological effect;
calculating a hadron biological dose for a plurality of spread-out Bragg peak (SOBP) sections based on the results of the determining step, wherein the plurality of SOBP sections include a declining distal edge and at least one other section of the SOBP; and
providing an optimized map of energies of each of a plurality of beams for delivering a biological dose.
2. The method of claim 1 , further comprising adjusting an intensity and energy of the plurality of beams.
3. The method of claim 1 , wherein the at least one other section of the SOBP includes at least one of: a proximal area of the SOBP, a distal area of the SOBP, and a pre-plateau area of the SOBP.
4. The method of claim 1 , wherein the calculated hadron biological dose superimpose for providing a desired biological dose at the treatment site.
5. The method of claim 1 , wherein the plurality of hadron beams comprise a plurality of proton beams.
6. The method of claim 1 , wherein the plurality of hadron beams comprise a plurality of carbon ion beams.
7. The method of claim 1 , wherein the geometric parameters include tissue specific parameters.
8. The method of claim 1 , wherein the plurality of hadron beams include a pencil beam.
9. The method of claim 8 , wherein the pencil beam comprises a poly-energetic pencil beam.
10. The method of claim 1 , wherein the biological effect includes at least any one of: cell killing, cell repair capacity, endothelial functionality, and specific constraints from organs at risk.
11. The method of claim 1 , wherein the step of providing an optimized map of energies outputs a histogram.
12. The method of claim 1 , further comprising delivering the biological dose based on the optimized map.