X-ray diagnostic apparatus for producing a transverse layer image

DETAILED DESCRIPTION Referring now in detail to FIG.
1 of the drawing, in the installation illustrated therein, a carrier ring 2, which is rotatably supported on a frame portion 1, moves about a rotational axis 5 which generally coincides with the body trunk portion 3 of a patient 4.
Located on the carrier ring 2 are two identical X-ray measuring arrangements, consisting of X-ray tubes 6 and 7, and radiation receivers 8 and 9, which are displaced in parallel along the direction of their linear movement.
The rotational movement of the carrier ring 2 about the X-rayed body portion of the patient 4 resting on the support bed 10 is carried out by means of a drive arrangement 11.
A further drive arrangement 12 serves to effect the linear scan movement of the mutually interconnected measuring arrangement 6, 7, 8 and 9 which move on rails 13 and 14.
Both of the X-ray tubes 6 and 7 are electrically connected with an X-ray generator 16 which supplies them with high constant electrical voltage of varied height.
The drive arrangements 11 and 12 for, respectively, the circular and linear movements are connected with a control arrangement 18, which coordinates both movements in their alternating sequence and the operative cycle of the X-ray tubes 6 and 7 with regard to each other.
The radiation receivers are connected with a computer 19 through a matching connection 17.
The output of the data which is calculated by the computer is provided by a teletype printer 20 and a video apparatus 21.
In the following description, the function of the installation of FIGS.
1 and 2 is explained in closer detail: After switching on, the drive arrangement 11 is actuated so as to move the carrier ring 2 into an outlet position which is offset with respect to the illustrated position by about 90.
degree.
.
Upon attainment of this position, scanning is commenced in a manner whereby the drive arrangement 12 displaces the measuring arrangements 6, 7, 8 and 9 in the linear scan movement in which the desired transverse layer of the patient 4 is X-ray and concurrently scanned (Scan I)