Method of evaluating a contrast data set, evaluation device, program and data carrier

By utilizing the projection decomposition of calcium-based and iodine-based vectors in dual-energy computed tomography (DCT) data from angiography, a calcium image dataset was generated, solving the problem of accurate quantification of calcium scores under iodine contrast agents, improving the accuracy of assessment and reducing radiation dose.

CN116172593BActive Publication Date: 2026-06-09SIEMENS HEALTHINEERS AG
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SIEMENS HEALTHINEERS AG
Filing Date
2022-11-08
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

In the prior art, it is difficult to accurately quantify calcium scores in angiography data using iodine contrast agents, especially since the spectral characteristics of iodine and soft tissue are similar, leading to inaccurate calcium material distribution and affecting the quantitative nature of calcium scores.

Method used

By pre-setting calcium and iodine base vectors in the two-dimensional space of dual-energy computed tomography data, projecting image vectors below the calcium base vectors, performing basic material decomposition, generating calcium image data sets, and adjusting the values ​​of the calcium base vectors in conjunction with calibration data to ensure accurate calcium score calculation.

Benefits of technology

This method enables robust and reliable calculation of calcium scores when using iodine contrast agents, reducing the radiation dose burden on patients, improving the accuracy and reliability of calcium score assessment, and avoiding image artifacts caused by non-physical decomposition.

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Abstract

The present disclosure relates to a method, an evaluation device, a computer program and an electronically readable data carrier for evaluating dual-energy computed tomography data sets of an angiogram. The method for evaluating dual-energy computed tomography data sets of an angiogram recorded using a contrast agent comprising iodine, which data sets comprise for each image point an image vector consisting of a first attenuation value assigned to a high energy spectrum and a second attenuation value assigned to a low energy spectrum, has the following steps for determining a quantitative calcium score: presetting a calcium and iodine basis vector in a two-dimensional dual-energy space spanned by the first attenuation value as abscissa and the second attenuation value as ordinate as a basis for basis material decomposition; projecting all image vectors in the dual-energy space that lie below a straight line defined by the calcium basis vector onto the straight line in order to obtain a modified data set; performing a basis material decomposition of the modified data set in order to obtain a calcium image data set; determining a quantitative calcium score from the calcium image data set.
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