| 摘要 |
In a method for detecting the three-dimensional position of a medical examination instrument introduced into a body region, particularly a catheter introduced into a vessel, and an apparatus for registering radiation images having at least one C-arm system with a C-arm with a radiation source and a radiation detector, a number of two-dimensional angiography projection images of the examination region into which the instrument is to be introduced are registered for later three-dimensional volume reconstruction of the examination region. After introduction of the instrument, at least one two-dimensional projection image pair of the examination region with image planes residing at an angle relative to one another is registered. The spatial coordinates of a selected point of the instrument shown in the projection images in a common coordinate system forming the basis of the exposure of the angiography projection images and the projection images is identified. The selected point of the instrument is presented within the three-dimensional volume reconstruction of the examination region in the common coordinate system at a monitor. Two-dimensional projection image pairs are registered continuously or discontinuously in succession for the continuous presentation of the selected point of the examination instrument located in the examination region.
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