Apparatus and method for dynamic spectral filtration

a dynamic spectral filter and apparatus technology, applied in the field of diagnostic imaging, can solve the problems of limited energy separation between samples, little opportunity to change the filtering between samples, and typical systems that do not include the ability to discriminate the spectral energy content of x-rays, etc., to achieve the effect of increasing energy separation and increasing energy separation
US20130287164A1Inactive Publication Date: 2013-10-31GENERAL ELECTRIC CO
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
GENERAL ELECTRIC CO
Publication Date
2013-10-31
Estimated Expiration
Not applicable · inactive patent

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Abstract

A CT imaging system includes a multi-position x-ray filter having a filter element configured to spectrally filter a beam of x-rays and a magnet structure configured to selectively generate a magnetic field to cause the filter element to move between filter and non-filter positions. A CT imaging system computer causes an x-ray source to emit x-rays at each of a first kVp and a second kVp and control the multi-position x-ray filter to position the filter element in the non-filter position during emission of the x-rays at the first kVp and in the filter position during emission of the x-rays at the second kVp. The computer causes current to be provided to the magnet structure so as to generate a magnetic field configured to move the filter element to the filter and non-filter positions at high frequency, into and out of a path of the beam of x-rays.
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Description

BACKGROUND

[0001] The present invention relates generally to diagnostic imaging and, more particularly, to a system and method for dynamic spectral filtration for providing an increased separation of mean energies between low and high kVp image acquisitions.

[0002] Medical imaging devices comprise x-ray systems, magnetic resonance (MR) systems, ultrasound systems, computed tomography (CT) systems, positron emission tomography (PET) systems, ultrasound, nuclear medicine, and other types of imaging systems. Typically, in CT imaging systems, an x-ray source emits a fan-shaped beam toward a subject or object, such as a patient or a piece of luggage. Hereinafter, the terms “subject” and “object” shall include anything capable of being imaged. The beam, after being attenuated by the subject, impinges upon an array of radiation detectors. The intensity of the attenuated beam radiation received at the detector array is typically dependent upon the attenuation of the x-ray beam by the subject. E...

Claims

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