Leaf, multi-leaf collimator, device for delimiting beams and irradiation device

A multi-leaf collimator for delimiting a high-energy beam of an irradiation device for conformation irradiation, the collimator comprising:

• a plurality of mutually opposite leaves which can be brought into a beam path via drives such that a beam contour can be shaped in accordance with a volume to be irradiated, wherein each of said leaves comprises a beam-absorbing material of appropriate thickness only in a region which may enter into a path of the high-energy beam for all possible adjustment positions of the collimator, wherein the leaf comprises an other region which does not absorb the beam, said other region consisting essentially of an other material having a lower atomic number than said beam-absorbing material and also having good mechanical properties.

A device for delimiting a high-energy beam for conformation irradiation, the device comprising:

• a multi-leaf collimator having a plurality of mutually opposite leaves which can be brought into a beam path via drives, such that a contour of the beam can be shaped in accordance with a volume to be irradiated;
• and
• a further shielding to delimit a path of the high-energy beam, wherein said leaves each comprise a beam-absorbing material of appropriate thickness only in a region which can enter into the path of the high-energy beam and which is not shielded by said further shielding at all possible adjustment positions of said leaves, wherein each of said leaves comprises an other region which does not absorb the beam, said other region consisting essentially of an other material having a lower atomic number than said beam-absorbing material and also having good mechanical properties.

An irradiation device for conformation irradiation, the device comprising:

• means for delimiting a high-energy beam emitted by an irradiation source, said delimiting means having a multi-leaf collimator comprising a plurality of mutually opposite leaves which can be brought into a beam path via drives such that a contour of the beam path can be shaped in accordance with a volume to be irradiated, said delimiting means also comprising a further shielding for delimiting a path of the high-energy beam, wherein each of said leaves comprises a beam-absorbing material of appropriate thickness only in a region which can enter into a path of the high-energy beam and which is not shielded by said further shielding for all possible adjustment positions, wherein each of said leaves comprises an other region which does not absorb the beam, said other region consisting essentially of an other material having a lower atomic number than said beam-absorbing material and also having good mechanical properties.