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公开(公告)号：DE59912486D1
公开(公告)日：2005-10-06
申请号：DE59912486
申请日：1999-07-28
Applicant: PHILIPS INTELLECTUAL PROPERTY
Inventor： PROKSA ROLAND , TIMMER JAN
Abstract: The invention relates to a computer tomography apparatus in which the scanning trajectory is shaped as a helix and a conical radiation beam traverses the examination zone. According to the invention, the dimension of the detector window (or the part thereof which is used for the reconstruction) is a factor of 3, 5, 7 . . . larger than the distance between neighboring turns of the helix. Using this geometry, each voxel in the examination zone is irradiated exactly from an angular range of 3pi, 5pi, 7pi . . . when it traverses the cone beam. Such data acquisition yields an improved image quality.
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