Patent ID: 8308717

Claim:
Apparatus for delivering radiation to a target volume ( 46 ) beneath a skin surface, comprising: a radiation source ( 16 ) for inputting a beam of said radiation having an input energy fluence; and a beam conversion system ( 17 ) comprising: a rotator ( 21 ) having a rotation axis in optical alignment with said beam and a first radiation directing element ( 24 ) arranged in optical communication with said radiation source comprising a reflective element rigidly mounted on said rotator having a symmetry axis ( 27 ), collinear with said rotation axis for rotating said input beam around said symmetry axis said first radiation directing element adapted to direct said beam in a plurality of directions spaced around said symmetry axis, and a second radiation directing element ( 25 ) comprising a single reflective element mounted at a fixed distance from said rotation axis facing said first radiation directing element for redirecting said directed beam through said surface radially inwards towards said symmetry axis onto said at least one target volume ( 46 ) disposed on said symmetry axis beneath said skin surface, such that said radiation is spread out in a rotational path on said surface, wherein said rotator is adapted to direct said beam in directions such that any given point of said target volume is exposed to said radiation during the entire energy excitation period of said beam, while any given point of said rotational path on said surface is exposed to said radiation only during portion of said enemy excitation period, and said first radiation directing element ( 24 A) has reflecting surface with curvature in at most, one plane, and said second radiation directing element ( 25 ) has reflecting surface ( 39 ) with curvature in at most, one plane, and none of said radiation impinging on said skin surface overlaps with said symmetry axis, and said energy fluence of said radiation at said target volume is higher than said energy fluence of said radiation at said skin surface.