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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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of the disclosed model is that the manufacture of

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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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