ANGIOGRAPHIC EXAMINATION METHOD TO IMPLEMENT A ROTATIONAL ANGIOGRAPHY

摘要

In an angiographic examination method to implement rotational angiographies, two x-ray projections of the examination subject are acquired from different acquisition angles, the x-ray projections are segmented to generate the outer contours of the examination subject in both x-ray projections, the outer contours of the examination subject are discretized in both x-ray projections, the coordinates of the focal points of the examination subject are calculated from these discrete points in both x-ray projections, the deviations of the coordinates of the focal points of the examination subject are determined, the deviations of the coordinates are evaluated, and the results of the evaluation are emitted as an output./

主权项

1. A method to operate an angiographic examination system to conduct a rotational angiography of an examination subject around an isocenter of the angiographic examination system, said method comprising:
(S1) placing an examination subject on a patient support and acquiring two x-ray projections of the examination subject, respectively from different acquisition angles, by rotating at least one C-arm-mounted x-ray radiator and x-ray image detector around the patient on the patient support; (S2) providing said two x-ray projections to a computer and, in said computer, automatically segmenting the x-ray projections to generate outer contours of the patient in each of said two x-ray projections; (S3) in said computer, automatically discretizing said outer contours in each of said two x-ray projections; (S4) in said computer, automatically calculating coordinates of focal points of the patient from discrete points in each of said two x-ray projections produced by said discretization of said outer contours; (S5) in said computer, automatically determining deviations of said coordinates of the respective focal points of the patient; (S6) in said computer, automatically evaluating said deviations of said coordinates to produce an evaluation result; and (S7) presenting said evaluation result in a humanly perceptible form as an output from said computer in communication with said computer.