Portal imaging device

A radiation treatment apparatus comprising:

• a stand;
• a gantry supported by said stand in a rotatable manner;
• a treatment head coupled to project out from a front surface of said gantry at one end thereof and emitting a radiation beam towards an object;
• an extendable imaging device coupled to another end of said gantry which is opposite to the treatment head in the trajectory of said extendable radiation beam and at a point past said object, said imaging device including:
• a holding means arranged to be controllably extendable out from behind said front surface of said gantry and forming a light-tight channel;
• a detector head coupled to the outer end of said holding means, said detector head having:
• an image converting means collapsibly coupled to said detector head, which in its operating position is essentially perpendicular to said radiation beam and which converts an image represented by said radiation beam into a visible image,
• a reflector foldably coupled with said image converting means for reflecting said visible image into said light channel;
• and
• a video camera arranged behind said front surface of said gantry in said light-tight channel for receiving said visible image.

A radiation emitting apparatus comprising:

• a stand;
• a gantry supported by said stand;
• a radiation emitting head coupled to said gantry at one end thereof, for emitting a radiation beam towards an object;
• an extendable imaging device coupled to another end of said gantry which is opposite to said head in the trajectory of said radiation beam and at a point past said object, said extendable imaging device including:
• a holding means arranged to be controllably extendable from said gantry in a first direction which is perpendicular from said gantry for holding a detector head at the outer end of said holding means, said detector head comprising an image converting means hingedly coupled to said outer end of the extendable holding means so as to be pivotable between an operating and a non-operating position, wherein in its operating position said image converting means is parallel with said first direction so as to intercept said radiation beam and convert an image represented by said radiation beam into a visible image, and in its non-operating position it is pivoted with respect to said outer end of the extendable holding means so as to be perpendicular to said first direction and parallel with said gantry;
• and
• electronic imaging means optically coupled to said converting means for receiving said visible image and generating an electronic signal representative of said visible image.