X-ray ct apparatus, and its method

Abstract

In an X-ray CT apparatus (1) and an X-ray CT method, the thickness of an inspection object is computed on the basis of the number of transmission X-rays in a specific energy range set by the upper and lower K-absorption ends of an X-ray contrast media acting as the inspection object, and a CT image is reconstituted on the basis of the computed thickness of the inspection object. These X-ray CT apparatus (1) and X-ray CT method can create the X-ray CT image stably independently of the magnitude of the inspection object and the X-ray tube voltage (or the energy distribution of the X-ray).

Description

technical field [0001] The present invention relates to an X-ray CT device and an X-ray CT method, in particular to an X-ray CT device and an X-ray CT method for generating CT images according to energy information of transmitted X-rays. Background technique [0002] Image diagnosis based on X-ray transmission or image diagnosis based on X-ray CT (Computed Tomography, computerized tomography) can find lesions such as cancer or ulcer inside the subject, so it is used as an effective diagnostic method . In these image diagnoses, the dose of X-rays transmitted through the subject (or the dose of X-rays absorbed by the subject) is measured, and an X-ray image is generated by graphically expressing the increase or decrease of the dose . Since the elements constituting living organisms are relatively light elements such as hydrogen, nitrogen, oxygen, and calcium, the absorption coefficient of X-rays is small. Therefore, in order to generate a clear X-ray image when a living bod...

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Problems solved by technology

In this case, if the X-ray transmission length becomes longer due to the larger living body, the absorption of X-rays by the living body cannot be ignored, so the effect of the contrast agent will be reduced

In addition, if the amount of X-rays is to be increased, it is generally achieved by increasing the voltage applied to the X-ray tube (X-ray tube voltage), so that the high-energy components of the X-rays irradiated to the living body increase.

Therefore, the X-rays absorbed by the contrast agent will be reduced

[0008] Moreover, although the patent document 1 (D1) describes that the X-ray imaging method disclosed in the patent document 1 (D1) can be applied to CT (paragraph [0078]), the specific details are not disclosed. structure, and as its effect, only a reduction in the radiation dose of X-rays can be predicted

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