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Error identification in computer positron emission tomography instrument

A technology of computer and imaging equipment, applied in the field of error identification in computerized tomography imaging equipment, can solve the problems of high cost and small size, and achieve the effect of good error security

Inactive Publication Date: 2015-01-07
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Not insignificantly higher costs in the operation of the computed tomography system arise in some cases due to the premature replacement of the x-ray tube

Method used

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  • Error identification in computer positron emission tomography instrument
  • Error identification in computer positron emission tomography instrument
  • Error identification in computer positron emission tomography instrument

Examples

Experimental program
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Embodiment Construction

[0031] figure 1 A computed tomography apparatus 1 is schematically shown roughly schematically, comprising an (X-ray) tube 2 and an (X-ray) detector 3 . Tube 2 and detector 3 are installed opposite to each other in ( figure 1 (shown only symbolically) on the gantry 4 , so that the X-rays R emitted from the tube 2 fall on the detector 3 . The tube 2 and the detector 3 can rotate together with the frame 4 around a concentric shaft 5 arranged in the center of the frame 4 .

[0032] The computed tomography apparatus 1 also includes a control and evaluation computer 6 and a voltage generator 7 .

[0033] Tube 2 comprises (in the usual configuration) a cathode 8 and a rotating anode 10 rotatable about an anode axis 9 . During operation of the computed tomography apparatus 1 , a tube voltage U is applied between the (heated) cathode 8 and the rotating anode 10 by means of a voltage generator 7 , under the effect of which an electron beam E emerges from the cathode 8 and is directe...

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Abstract

#CMT# # / CMT# The method involves detecting exposure intensity (B) in detector lines (13a, 13b) in a time-resolved manner while performing a test measurement i.e. empty measurement, by using a computer tomograph (1). Spectral selective fluctuation of the detected intensity with rotating anode frequency and / or integral multiples of the anode frequency is determined. Measure of strength of plate shock of a rotating anode (10) of an X-ray tube (2) of the tomograph is derived from the fluctuation. An error is identified to be caused due to plate shock when the fluctuation exceeds a threshold value. #CMT# : # / CMT# An independent claim is also included for a computer tomograph. #CMT#USE : # / CMT# Method for identifying an error caused due to plate shock in an X-ray tube of a computer tomograph (claimed). #CMT#ADVANTAGE : # / CMT# The measure of strength of plate shock of the rotating anode of the X-ray tube is derived from the spectral selective fluctuation of the exposure intensity, so that the error caused due to plate shock in the X-ray tube can be directly detected in a simple manner without unnecessary exchange of the X-ray tube. #CMT#DESCRIPTION OF DRAWINGS : # / CMT# The drawing shows a schematic side view of a computer tomograph with a rotating anode X-ray tube, and an X-ray detector and a controlling and evaluating computer, which are arranged in juxtaposition to the X-ray tube. B : Exposure intensity 1 : Computer tomograph 2 : X-ray tube 10 : Rotating anode 13a, 13b : Detector lines.

Description

technical field [0001] The invention relates to a method for detecting errors in a computer tomograph, in particular for detecting defective x-ray tubes of a computer tomograph. The invention also relates to a computed tomography apparatus equipped for automatic error detection. Background technique [0002] Computed tomography machines are usually designed with high-power x-ray tubes. In order to avoid overheating of the anode material, such X-ray tubes usually comprise a so-called rotating anode, in which the anode material is rotated relative to the radiation-generating electron beam. A disturbing effect that frequently occurs in such x-ray tubes is the so-called “plate shock”. This generally refers to the periodic displacement of the x-ray focal point relative to the fixed housing of the x-ray tube caused by the rotation of the anode. Plate impacts can be caused in particular by imbalances and the resulting rocking movements of the rotating anode. Other causes of pla...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B6/03
CPCA61B6/582H01J35/10A61B6/4021A61B6/4233A61B6/586A61B6/583H05G1/54A61B6/032
Inventor R.劳佩克N.鲁斯卡O.塞姆布里兹基
Owner SIEMENS AG