Patent ID: 8964938
Filing Date: 2015-02-24
Classification: A61B

Abstract:
1. A method for acquiring X-ray images with the aid of an X-ray radiation detector comprising a scintillator that converts X-ray beam quanta striking the X-ray radiation detector to light quanta and also comprising a grid of detector units, each detector unit having a light-sensitive receiver at which a measurement value is changed by light quanta striking the light-sensitive receiver, and each detector unit having a buffer for measurement values read out from the light-sensitive receiver, the method comprising: (a) resetting the measurement value at each of the light-sensitive receivers to a predefined value, (b) emitting X-ray radiation with a first spectrum from an X-ray tube, such that said X-ray radiation with the first spectrum passes through an image object and then strikes the X-ray radiation detector, (c) reading out a first measurement value from each of the light-sensitive receivers into a buffer associated with each respective receiver, each first measurement value corresponding to X-ray radiation with the first spectrum detected by the respective light-sensitive receiver, and then resetting the measurement value to the predefined value in each receiver, (d) emitting X-ray radiation with a second spectrum from the X-ray tube, such that said X-ray radiation with the second spectrum passes through the image object and then strikes the X-ray radiation detector, (e) reading out the first measurement values from all of the buffers into a central memory, thereby generating a 2D X-ray image data record for the first spectrum, and (f) reading out a second measurement value from each of the light-sensitive receivers into the central memory, each second measurement value corresponding to X-ray radiation with the second spectrum detected by the respective light-sensitive receiver, thereby generating a 2D X-ray image data record for the second spectrum, wherein the step of emitting X-ray radiation with the second spectrum from the X-ray tube is initiated during or prior to the step of reading out the first measurement values from the buffers.