Method and computed tomography device for dynamic CT examination of a patient and data carriers

摘要

A method for a computed tomography device (11) for dynamic CT examination of a patient (P), having a gantry (12) with a stationary part (13) and a part (14) which is rotatable about a system axis (15) and opposite one another an x-ray source (16) and an x-ray detector (17) are arranged, to which x-ray source (16) a diaphragm (30) is assigned, which diaphragm elements (31, 32) adjustable in the direction of the system axis (15) for delimiting one of the x-ray source (16 ) has outgoing X-ray beam (18) in the direction of the system axis (15), and - a patient positioning plate (21) which is adjustable in the direction of the system axis (15) and in which the patient positioning plate (21) is used for a dynamic CT examination of a body region of the patient (P) ) is adjusted in the direction of the system axis (15) between a first and a second end position (E1PL, E2PL) of the patient support plate (21), in which at the same time the Panel elements (31, 32) of the panel (30) are adjusted in the direction of the system axis (15) between a first and a second end position (E1 panel, E2 panel) of the panel elements (31, 32) and in which the panel elements (31, 32) in the direction the system axis (15) viewed a certain opening width (W) to limit the X-ray beam (18) emanating from the X-ray source (16) in the direction of the system axis (15), which is selected such that the X-ray beam (18) when it hits the X-ray detector (17) viewed in the direction of the system axis (15) only illuminates part of the detector surface of the X-ray detector (17) and which remains constant during the adjustment movement of the diaphragm elements (31, 32) in the direction of the system axis (15).