Method for reappearing projection data in dosage reduced sectional type spiral scanning

一种投影数据、剂量的技术，应用在图像数据处理、图像数据处理、根据投影再现等方向，能够解决减小剂量等问题

Inactive Publication Date: 2005-11-02
SIEMENS AG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0022] As already mentioned, the data acquisition in the previously shown methods is either slice-wise or slice-wise, and there is no option for dose reduction

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  • Method for reappearing projection data in dosage reduced sectional type spiral scanning
  • Method for reappearing projection data in dosage reduced sectional type spiral scanning
  • Method for reappearing projection data in dosage reduced sectional type spiral scanning

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Embodiment Construction

[0038] figure 1 A patient 1 on a patient couch 2 is schematically shown in front view. The patient 1 is lying flat so that the organs susceptible to radiation (mammary gland 4 and eye lens 3 are shown) face the upper region (front) of the support opening 5 . The scanning takes place in such a way that the x-ray tube-detector unit (carriage) rotates in a circle around the patient, while the patient moves at a uniform velocity (constant table precession d) along the patient's longitudinal axis z. according to figure 2 , the combination of stent rotation and patient translation gives a helical scan trajectory 6, as is common in helical CT.

[0039] The object of the invention is to protect the mentioned radiation-sensitive organs during the helical scan, or to apply the lowest possible radiation dose with the best possible image quality or the smallest loss of information. According to the invention, this object is achieved in that the current is applied to the x-ray tube on...

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Abstract

In a method and CT apparatus and software product for reconstructing incomplete projection data sets for dose-reduced sectional spiral scanning along a z axis of a patient on a table that is movable in the z direction in the CT apparatus that has a radiation source supplied with tube current so as to emit a beam that strikes a detector system to obtain scanning data from which in an image computing device generates two-dimensional and three-dimensional scanning images of the examination subject, at a pitch greater or equal to one. For z positions having an incomplete projection data set for reconstruction of the image, in a preprocessing step data from another row of this projection and / or data for a previous or subsequent 360° rotation are used to compute a complete projection data set therefor.

Description

technical field [0001] The present invention generally relates to computed tomography for examining patients in medicine. In this context, the invention relates in particular to a method for image reconstruction in a segmented dose-reducing helical scan. Background technique [0002] Image data of the measurement object to be examined can be obtained using modern medical diagnostic methods such as X-ray computed tomography. Usually the object to be checked and measured is the patient. [0003] X-ray computed tomography (hereinafter referred to as CT) is a special X-ray imaging method, which basically differs from classical X-ray tomography methods in constructing images. Transverse sectional images, ie images of body slices substantially perpendicular to the body axis, are acquired during the CT scan. The tissue-specific physical parameter displayed in the image is the distribution μ(x,y) of the attenuation values ​​of the x-ray radiation in this section. CT images are o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B6/03A61B6/06G01T1/29G01T1/36G06T17/00G21K1/12
CPCA61B6/544G06T2211/432A61B6/542A61B6/032G06T11/006G01T1/2985G06T2210/41A61B6/027
Inventor 威利·卡伦德斯蒂芬·沙勒伯恩哈德·施米特
Owner SIEMENS AG
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