Patent Number: 
Section: claims

1. For use with an irradiation system comprising a radiation source operable to produce a radiation beam towards a target, a beam modulator comprising:a flexible, deformable container at least partially filled with a radiation attenuating fluid;a non-deformable first contacting surface in contact with a first portion of said container, said first contacting surface pivotable about a first axis; anda positioner operable to rotate said first contacting surface about said first axis, wherein as said first contacting surface rotates about said first axis, said first contacting surface deforms said container. 2. The beam modulator according to claim 1, wherein said first axis is generally perpendicular to a propagation axis of the radiation beam. 3. The beam modulator according to claim 1, further comprising a non-deformable second contacting surface in contact with a second portion of said container different from said first portion, said second contacting surface pivotable about a second axis, and a positioner operable to rotate said second contacting surface about said second axis, wherein as said second contacting surface rotates about said second axis, said second contacting surface deforms said container. 4. The beam modulator according to claim 3, wherein said second axis is generally perpendicular to a propagation axis of the radiation beam. 5. The beam modulator according to claim 3, wherein said second axis is different than said first axis. 6. The beam modulator according to claim 3, wherein said second axis is generally perpendicular to said first axis. 7. The beam modulator according to claim 3, wherein said positioner that positions said first contacting surface is the positioner that positions said second contacting surface. 8. The beam modulator according to claim 3, wherein said positioner that positions said first contacting surface is separate from the positioner that positions said second contacting surface. 9. The beam modulator according to claim 3, wherein said positioner is operable to translate at least one of said first and second contacting surfaces. 10. The beam modulator according to claim 3, wherein said first and second contacting surfaces are generally radiation transparent. 11. The beam modulator according to claim 1, wherein said positioner is in communication with an orientation changer, wherein said orientation changer is operable to change an orientation of the beam and the target. 12. The beam modulator according to claim 1, wherein said container is made of an elastomeric material. 13. For use with an irradiation system comprising a radiation source operable to produce a radiation beam towards a target, a beam modulator comprising:a flexible, deformable container at least partially filled with a radiation attenuating fluid;a plurality of non-deformable contacting surfaces in contact with a plurality of portions of said container, said contacting surfaces pivotable about a plurality of pivot axes; anda positioner system operable to rotate said contacting surfaces about said pivot axes, wherein as said contacting surfaces rotate about said pivot axes, said contacting surfaces deform said container. 14. An irradiation system comprising:a radiation source operable to produce a radiation beam towards a target; anda beam modulator comprising:a flexible, deformable container at least partially filled with a radiation attenuating fluid;a plurality of non-deformable contacting surfaces in contact with a plurality of portions of said container, said contacting surfaces pivotable about a plurality of pivot axes; anda positioner system operable to rotate said contacting surfaces about said pivot axes, wherein as said contacting surfaces rotate about said pivot axes, said contacting surfaces deform said container.