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Focal spot size measurement with a movable edge located in a beam-shaping device

A beam shaping and focal spot technology, applied in the field of X-ray imaging, can solve the problems of complex model manufacturing and complex surface structure, and achieve the effect of high edge response magnification

Inactive Publication Date: 2009-08-05
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of the disclosed model is that the manufacture of the model is rather complicated due to the complex surface structure

Method used

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  • Focal spot size measurement with a movable edge located in a beam-shaping device
  • Focal spot size measurement with a movable edge located in a beam-shaping device
  • Focal spot size measurement with a movable edge located in a beam-shaping device

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Embodiment Construction

[0056] Figure 1a A schematic diagram of a medical X-ray imaging apparatus 100 is shown. The medical X-ray imaging device 100 comprises an X-ray tube 105 with an anode 110 . The anode 110 is rotatably supported within a rotating shaft 115 . An electron beam is emitted from an electron source (not shown), whereby the electrons impinge on the surface 111 of the anode within a focal spot 112 . The focal spot 112 has a spatial magnification due to the limited focusing of the electron beam.

[0057] X-ray beam 117 originates from focal spot 112 and projects along optical axis 118 . During normal operation of the medical X-ray imaging apparatus 100, the X-ray beam 117 at least partially penetrates an object under examination (not shown), and the flat panel X-ray detector 130 receives an image representing a two-dimensional X-ray attenuation distribution. In this context, it is evident that the larger the size of the focal spot 112 is, the larger the unsharpness of the entire imag...

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Abstract

It is described a method for measuring the sharpness in an X-ray system (100). The measurement is based on a common edge response. An edge device (120) representing the projection device is placed within a beam-shaping device (470). Due to a high geometrical magnification factor the edge response function (241a) and also both an impulse response function (246a) and a modulation transfer function (251a) will predominately depend on the size of the focal spot (112) rather than on a pre- sampling spread function of a detector (130) being used for receiving the X-radiation (117), which has laterally passed the edge device (120).

Description

technical field [0001] The present invention relates generally to the field of X-ray imaging. In particular, the invention relates to a method for determining the spatial distribution of the focal spot of an X-ray tube, which is produced by electrons impinging on the anode surface of the X-ray tube. [0002] The invention also relates to a data processing device and a medical X-ray imaging device for determining the spatial distribution of the focal spot of an X-ray tube. [0003] Furthermore, the invention relates to a computer-readable medium and a program element having instructions for carrying out the above-described method for determining the spatial distribution of a focal spot of an X-ray tube. Background technique [0004] The shape and size of the focal spot of an X-ray tube are important parameters for X-ray imaging. A blurred focal spot leads to unclear x-ray images recorded by means of x-rays originating from the magnified focal spot area. Therefore, knowledg...

Claims

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Application Information

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IPC IPC(8): A61B6/00G01N23/04
CPCA61B6/583G21K1/02H05G1/26
Inventor R·M·斯诺尔仁
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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