Patent Number: 
Section: claims

1. A device for recording projection images, comprising:a C-arm support;a radiation source arranged on the support and configured to be moved with the support to be positionable about a patient placed on a patient bed so that the radiation passes through the patient;a radiation detector arranged on an opposite side of the support relative to the radiation source and configured to be moved around the patient in accordance with movement of the radiation source;said apparatus having an imaging geometry in which the radiation source and the radiation detector face each other;said radiation detector further configured to detect radiation emitted by the radiation source and to generate projection images of the patient based on the detected radiation; and,a controller configured to:move, by a moving device, the radiation detector;(i) translatorily relative to the support; and,(ii) translatorily relative to the source;wherein the translatory movements of the radiation detector include parallel movements relative to a center radiation beam emitted by the radiation source;execute both a forward movement of the radiation detector relative to a lengthwise direction along the patient bed and a lifting movement of the radiation detector relative to the lengthwise direction along the patient bed; and,wherein, during said movements, said imaging geometry is preserved and the size of the area for which the image is to be recorded is increased, while said C-arm support is angled for caudal imaging with a tilting movement by a tilting device. 2. The device in accordance with claim 1, wherein the translatory movements of the radiation detector includes an orthogonal movement relative to a center radiation beam emitted by the radiation source. 3. The device in accordance with claim 1, wherein the radiation source is configured to be moved translatorily corresponding to and following the translatory movement of the radiation detector. 4. The device in accordance with claim 1, further comprising:a monitoring device for detecting a danger of collision by the radiation source or by the radiation detector while operating the device and for controlling the translatory movement by the radiation source or by the radiation detector to avoid the collision. 5. The device in accordance with claim 1, wherein the support is a curved arm configured to be moved in a circumferential direction and to be pivoted round a radial axis of rotation. 6. The device in accordance with claim 1, further comprising only one x-ray source and only one x-ray detector. 7. A device for recording projection images, comprising:a radiation source arranged on a C-arm support and configured to be moved with the support around an imaging object;a radiation detector arranged on an opposite side of the support relative to the radiation source and configured to be moved around the imaging object in accordance with the moving of the radiation source, the radiation detector further configured to detect radiation emitted by the radiation source and to generate projection images of the imaging object based on the detected radiation;said apparatus having an imaging geometry in which the radiation source and the radiation detector face each other;a controller configured to:move, by a moving device, the radiation detector;(i) translatorily relative to the support; and,(ii) translatorily relative to the source;wherein the translatory movements of the radiation detector include parallel movements relative to a center radiation beam emitted by the radiation source;execute both a forward movement of the radiation detector relative to a lengthwise direction along the patient bed and a lifting movement of the radiation detector relative to the lengthwise direction along the patient; andwherein, during said movements, said imaging geometry is preserved and the size of the area for which the image is to be recorded is increased, while said C-arm support is angled for caudal imaging with a tilting movement by a tilting device; and,a monitoring device for detecting a danger of collision by the radiation source or by the radiation detector while operating the device and for controlling the translatory movement by the radiation source or by of the radiation detector to avoid the collision.