A method for 3 - d - data acquisition with a biplanar faceted - c - arc - a system with improved temporal resolution of the secondary reconstruction

摘要

A method for 3 - d - acquisition by means of a series of projection images of an object to be examined from different imaging angles during a rotation of the barrel of a biplanar faceted - c - arc - a system with two separate c - arc - planes, the intermediate angle in a " are arranged with respect to one another ", and from the projection images three-dimensional image data can be reconstructed, characterized by the following steps:a) detection of the cardiac activity by means of an ecg,b) determination of the heart rate of the object to be examined and calculation of a start - heart phase for the start of the acquisition of the data,c) calculation of parameters of the c - arc - planes from the according to step b) determined and calculated values and adjustment of the parameters,d) start of the acquisition of the data of n in the start - heart phase, after setting the parameters,e) uniform rotation of the two c - arc - planes with the same speed in a direction of rotation as the first forward run over an angular range of 200° + " intermediate angle of projection images " and the receptacle in the case of various different angular regions of the patient''s cardiac phases,f) positioning of the two c - arc - planes in their starting positions, without the image recording, after completion of the first forward barrel,g) start of the acquisition of the data about 1 / 4 heart phase, earlier than the start - heart phase,h) uniform rotation of the two c - arc - planes with the same speed in the same direction of rotation as the second forward run over an angular range of 200° + " intermediate angle " and receiving of different angular ranges in the case of different heart phases of the patient andi) reconstruction of the data obtained at any desired cardiac phases after completion of the second forward barrel.