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YY/T 1766.3-2023: Image quality evaluation methods for computed tomography system - Part 3: Dual energy imaging and spectral application performance
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Image quality evaluation methods for computed tomography system - Part 3: Dual energy imaging and spectral application performance
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YY/T 1766.3-2023
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Basic data | Standard ID | YY/T 1766.3-2023 (YY/T1766.3-2023) | | Description (Translated English) | Image quality evaluation methods for computed tomography system - Part 3: Dual energy imaging and spectral application performance | | Sector / Industry | Medical Device & Pharmaceutical Industry Standard (Recommended) | | Classification of Chinese Standard | C43 | | Classification of International Standard | 11.040.50 | | Word Count Estimation | 36,383 | | Date of Issue | 2023-06-20 | | Date of Implementation | 2025-01-01 | | Issuing agency(ies) | State Drug Administration | | Summary | This standard specifies the performance evaluation methods for X-ray computed tomography equipment (hereinafter referred to as CT scanning device) for dual-energy imaging and energy spectrum applications. This standard applies to whole-body and special-purpose CT scanning devices, including CT scanning devices that provide image data for radiation treatment planning, but does not include oral CT scanning devices or angiography and mobile C-arm equipment with three-dimensional imaging functions. | YY/T 1766.3-2023: Image quality evaluation methods for computed tomography system - Part 3: Dual energy imaging and spectral application performance
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ICS 11.040.50
CCSC 43
Pharmaceutical Industry Standards of the People's Republic of China
X-ray computed tomography equipment
Image quality evaluation method
Part 3.Performance evaluation of dual-energy imaging and energy spectrum applications
Published on 2023-06-20
Implemented on 2025-01-01
Released by the State Drug Administration
Table of contents
PrefaceⅠ
Introduction II
1 Scope 1
2 Normative reference documents 1
3 Terms and Definitions 1
4 Typical imaging conditions of CT dual-energy imaging 4
5 Dose level evaluation method of CT dual-energy imaging5
5.1 Test device 5
5.2 Test conditions 5
5.3 Test principle 5
5.4 Test method 6
5.5 Result expression 7
6 Conventional image performance evaluation methods for CT dual-energy imaging7
6.1 Noise amplitude, average CT value and uniformity7
6.2 XY plane modulation transfer function (MTF) 8
6.3 Z-axis MTF 9
6.4 Reconstructing slice thickness10
6.5 Low contrast resolution11
7 Energy spectrum image performance evaluation method for CT dual-energy imaging 11
7.1 Evaluation of material separation performance 11
7.2 Quantitative performance evaluation of substances13
8 Performance evaluation methods applicable to CT dual-energy imaging and energy spectrum applications14
8.1 Overview 14
8.2 CT dual-energy imaging that provides high-energy images and low-energy images 14
8.3 Providing CT dual-energy imaging for routine diagnostic images15
8.4 CT dual-energy imaging that provides CT energy spectrum images 15
8.5 Post-processing software for energy spectrum applications 16
8.6 Evaluation methods applicable to CT dual-energy imaging and energy spectrum applications16
Appendix A (informative) Implementation methods of CT dual-energy imaging technology 17
Appendix B (informative) Physical properties of reference materials and X-ray interaction 23
Appendix C (informative) Image type generation principles and evaluation examples of common CT dual-energy imaging 25
Appendix D (informative) Relevant standards and research materials 28
Reference 30
Foreword
This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents"
Drafting.
This document is Part 3 of YY/T 1766 "Method for Image Quality Evaluation of X-ray Computed Tomography Equipment". YY/T 1766
The following sections have been published.
---Part 1.Modulation transfer function evaluation;
---Part 2.Low-contrast resolution evaluation.
Please note that some content in this document may be subject to patents. The publisher of this document assumes no responsibility for identifying patents.
This part is proposed by the State Drug Administration.
This part is sponsored by the Medical X-ray Equipment and Appliances Sub-Technical Committee of the National Medical Electrical Standardization Technical Committee (SAC/TC10/SC
1)Report.
This section was drafted by. Shanghai Siemens Medical Devices Co., Ltd., Liaoning Provincial Medical Device Inspection and Testing Institute, Hangwei General Electric Medical
Systems Co., Ltd., Shanghai United Imaging Medical Technology Co., Ltd., Neusoft Medical Systems Co., Ltd., Philips Medical (Suzhou) Co., Ltd.
Company, Shenzhen Anke High-Tech Co., Ltd., Mingfeng Medical Systems Co., Ltd., and Quanteng (Beijing) Medical Equipment Co., Ltd.
The main drafters of this section. Tian Yi, Sun Zhiyong, Wang Yang, Wei Dong, Li Xiang, Zhou Pei, Liang Tiecheng, Liu Zhibo, Xu Dan, Wang Bin, Xing Zhanfeng,
Li Shuo, Cao Chen, Zeng Kai.
Introduction
Image quality evaluation is an important task in the standardization work related to X-ray computed tomography equipment (CT scanning device). especially in
Today, with the increasing development of CT technology, the evaluation method of CT scanning device imaging has changed from subjective judgment based on in-plane structured imaging.
It has entered a new stage of combining subjective and objective imaging and introducing quantitative evaluation for isotropic imaging that contains structural and functional information.
YY/T 1766 is a method standard system for image quality evaluation of CT scanning devices, aiming to establish standards for related image performance and imaging methods.
Standardized evaluation method, the standards currently published and under development consist of the following three parts.
---Part 1.Modulation transfer function evaluation. The purpose is to establish an evaluation method for the spatial imaging resolution of CT scanning devices.
---Part 2.Low-contrast resolution evaluation. The purpose is to establish an absolute evaluation method for low contrast imaging in CT scanning devices.
method, as well as an objective evaluation method to evaluate the comparability of low contrast resolution when CT scanning equipment is adapted to dose reduction technology.
---Part 3.Performance evaluation of dual-energy imaging and energy spectrum applications. The purpose is to establish a CT scanning device for dual-energy imaging, or
A method for evaluating the performance of relevant images when applying energy spectrum based on images or data obtained from corresponding acquisition modes.
Compared with conventional CT imaging methods, CT dual-energy imaging and energy spectrum applications can provide more clinical diagnostic information and can
Further optimize image quality in specific scenarios. After sufficient clinical research and practice accumulation in recent years, CT dual-energy imaging and energy spectrum applications
The clinical value of applications (such as virtual monochrome images, etc.) has been widely recognized by the radiology community and has gradually entered the standard process of clinical application.
Clinical diagnosis and treatment guidelines for specific diseases.
At the same time, with the development of CT imaging technology, diversified CT dual-energy imaging modes and energy spectrum applications are also used by more and more CT products.
products used. However, due to the diversity of implementation methods of related technologies, there is currently no unified performance evaluation method and standard. About CT Dual
The evaluation methods of image quality, dose levels and related quantitative functions related to energy imaging need to be standardized and normalized.
Based on the above status, this document provides a standardized performance evaluation method for CT dual-energy imaging and energy spectrum applications. On the one hand, it can
To promote the establishment of a dual-energy imaging performance evaluation system for CT products or related post-processing software products; on the other hand, it can provide clinical
When using different CT products or energy spectrum imaging software products for related applications, a method reference for mode selection and parameter adjustment is provided.
X-ray computed tomography equipment
Image quality evaluation method
Part 3.Performance evaluation of dual-energy imaging and energy spectrum applications
1 Scope
This document specifies the dual-energy imaging and energy spectrum applications of X-ray computed tomography equipment (hereinafter referred to as CT scanning equipment)
Performance evaluation methods.
This document applies to whole-body and dedicated CT scanning devices, including CT scanning devices that provide image data for radiotherapy planning, but does not include
Including oral CT scanning devices or angiography and mobile C-arm equipment with three-dimensional imaging capabilities.
2 Normative reference documents
The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, the dated quotations
For referenced documents without dates, only the version corresponding to that date applies to this document; for undated referenced documents, the latest version (including all amendments) applies to this document.
document.
GB 9706.244-2020 Medical electrical equipment Part 2-44.Basic safety and basic performance of X-ray computed tomography equipment
Special requirements
GB/T 10149 Medical X-ray equipment terms and symbols
GB/T 19042.5-2022 Evaluation and routine testing of medical imaging departments Part 3-5.X-ray computed tomography equipment
Image performance acceptance test and stability test
YY/T 1766.1-2021 X-ray computed tomography equipment image quality evaluation method Part 1.Modulation transfer function evaluation
YY/T 1766.2-2021 Image quality evaluation method for X-ray computed tomography equipment Part 2.Low contrast resolution
evaluate
3 Terms and definitions
The following terms and definitions as defined in GB/T 10149, GB 9706.244-2020, GB/T 19042.5-2022 apply to this document.
3.1
An imaging method that uses a CT scanning device to obtain data corresponding to a single energy spectrum for image reconstruction and processing.
Note 1.The “energy spectrum” here refers to the energy distribution in the traditional physics sense.
Note 2.Usually based on a single tube voltage, single filtering, energy integrating detector.
Note 3.Imaging with conventional CT scanning devices is usually single-energy imaging.
3.2
CT dual energy imagingdualenergyCTimaging
Use a CT scanning device to obtain data corresponding to two energy spectra in a dual-energy imaging process for imaging reconstruction and processing.
Way.
Note 1.The “energy spectrum” here refers to the energy distribution in the traditional physics sense.
Note 2.Different energy spectrum data can be generated and acquired through technology based on ray sources, filtering, and detectors. The current technology implementation method of CT dual-energy imaging
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