YY/T 1766.2-2021 English PDF

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YY/T 1766.2-2021: Image quality evaluation methods for computed tomography system - Part 2: Low contrast resolution evaluation
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Basic data

Standard ID: YY/T 1766.2-2021 (YY/T1766.2-2021)
Description (Translated English): Image quality evaluation methods for computed tomography system - Part 2: Low contrast resolution evaluation
Sector / Industry: Medical Device & Pharmaceutical Industry Standard (Recommended)
Classification of Chinese Standard: C43
Word Count Estimation: 26,222
Issuing agency(ies): State Drug Administration

YY/T 1766.2-2021: Image quality evaluation methods for computed tomography system - Part 2: Low contrast resolution evaluation

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Image quality evaluation methods for computed tomography system - Part 2.Low contrast resolution evaluation ICS 11.040.50 C43 People's Republic of China Pharmaceutical Industry Standards X-ray computed tomography equipment Image quality evaluation method Part 2.Evaluation of Low Contrast Resolution Released on 2021-03-09 2022-04-01 implementation Issued by the National Medical Products Administration

Table of contents

Foreword Ⅲ Introduction Ⅳ 1 Scope 1 2 Normative references 1 3 Terms and definitions 1 4 Quantitative evaluation of low contrast resolution of CT scanning device 4 4.1 Test overview 4 4.2 Test method 5 4.3 Expression of results 6 5 Objective contrast evaluation of low-contrast resolution when using reduced-dose image reconstruction technology 6 5.1 Test overview 6 5.2 Test method 8 5.3 Expression of results 9 Appendix A (informative appendix) Overview of task-based model observer evaluation 11 Appendix B (informative appendix) Model observers and channelization methods used in this standard 12 Appendix C (informative appendix) Quantitative evaluation based on manual observer 15 Appendix D (Informative Appendix) Operating Conditions for Evaluation of Low Contrast Resolution 16 Appendix E (informative appendix) Supplementary explanation of the statistical analysis of the recognition task. ROC, AUC and accuracy 17 Reference 20

Foreword

YY/T 1766 "X-ray computed tomography equipment image quality evaluation method" is divided into the following two parts. ---Part 1.Modulation transfer function evaluation; ---Part 2.Evaluation of low-contrast resolution. This part is part 2 of YY/T 1766. This section was drafted in accordance with the rules given in GB/T 1.1-2009. Please note that certain contents of this document may involve patents. The issuing agency of this document is not responsible for identifying these patents. This part was proposed by the State Drug Administration. This part is organized by the National Medical Electrical Appliance Standardization Technical Committee Medical X-ray Equipment and Apparatus Sub-Technical Committee (SAC/TC10/ SC1) Centralized. Drafting organizations of this section. Liaoning Provincial Medical Device Inspection and Testing Institute, Shanghai Siemens Medical Devices Co., Ltd., Hangwei General Electric Medical System Co., Ltd., Shanghai United Imaging Medical Technology Co., Ltd., Philips Medical (Suzhou) Co., Ltd. Shenyang Branch, Mingfeng Medical System Stock Co., Ltd., Canon Medical System Research and Development (Dalian) Co., Ltd., Shenzhen Anke High-Tech Co., Ltd., Neusoft Medical System Co., Ltd. Co., Ltd., Kuanteng (Beijing) Medical Equipment Co., Ltd. The main drafters of this section. Sun Zhiyong, Tian Yi, Xing Zhanfeng, Ye Shuoqi, Zhang Longda, Wei Dong, Li Xiang, Liang Jian, Zhou Pei, Jiang Haochuan, Zhou Hongliang, Wu Xiaoye, Pang Ling.

Introduction

The low-contrast resolution of CT is an important indicator of the image performance of CT scanning devices, and it also reflects the image quality and dose of CT scanning devices. Horizontal relationship. At present, the absolute evaluation of the low-contrast resolution of CT scanning devices is mainly done through visual evaluation. The influence of many factors. Due to the significant difference in low-contrast resolution at different doses, the expression of low-contrast resolution evaluation results is also A standardized and standardized form is needed. On the other hand, with reduced dose CT image reconstruction technology (such as iterative reconstruction technology, etc.), more and more CT products are applied How to effectively evaluate the comparability of low-contrast resolution while reducing the dose is also an important aspect of image quality evaluation. The method based on manual (expert) visual evaluation is often time-consuming and does not have broad application significance. Based on the objective comparative evaluation of the model observer Based on the research foundation in recent years, the price has also been gradually introduced into CT image quality evaluation. Based on the above status, this standard provides the low-contrast resolution for CT scanning devices and the use of reduced-dose image reconstruction technology Afterwards, the achievable dose reduction level is given a standardized evaluation method. The implementation of this method standard will surely unify and standardize the evaluation of low-contrast resolution in the CT industry. X-ray computed tomography equipment Image quality evaluation method Part 2.Evaluation of Low Contrast Resolution

1 Scope

This part of YY/T 1766 specifies the evaluation method of low-contrast resolution of CT scanning device images. This part is applicable to whole body and special X-ray computed tomography equipment (hereinafter referred to as CT scanning device), including radiotherapy CT scanning devices that plan to provide image data, but do not include oral CT scanning devices or angiography and mobile imaging with three-dimensional imaging capabilities. Moving C-arm equipment.

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article Pieces. For undated reference documents, the latest version (including all amendments) is applicable to this document. GB/T 10149-1988 Medical X-ray equipment terms and symbols

3 Terms and definitions

The following terms and definitions defined in GB/T 10149-1988 apply to this document. 3.1 Lowcontrastresolution The lowest contrast detail that can be distinguished from a uniform background for an object of a prescribed shape and size. [GB/T 19042.5-2006.3.11] Note. Low contrast resolution is also expressed as lowcontrastdetectability (LCD). 3.2 Region of interest; ROI Part of the image of particular interest drawn on the image at a certain moment. [GB/T 19042.5-2006.3.15] 3.3 CT operating conditions CTconditionsofoperation All optional parameters that dominate the operation of the CT scanning device. Note 1.Including, for example, the nominal body slice thickness, pitch coefficient, filtration, peak X-ray tube voltage, and X-ray tube current and loading time, or current time Between product. Note 2.Some CT operating conditions may change during the exposure process. Note 3.CT operating conditions include the parameters generated by the system according to the parameters selected by the user. [IEC 60601-2-44.2009/AMD2.2016, definition.201.3.202] 3.4 Protocol unit protocollement A specific set of CT operating conditions necessary to perform a scan. ......

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