YY/T 1766.4-2024Image quality evaluation methods for computed tomography scanners - Part 4: Evaluation of imaging performance under automatic exposure control (English PDF)
X射线计算机体层摄影设备图像质量评价方法 第4部分：自动曝光控制下的成像性能评价
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Issued by
NMPA
Level / Type
Industry · Recommended
Issue date
February 7, 2024
Implementation date
September 1, 2025
Scope
YY/T 1766.4-2024 is the English-translated version of X射线计算机体层摄影设备图像质量评价方法 第4部分：自动曝光控制下的成像性能评价.
YY/T 1766.4-2024 is the Chinese standard "Image quality evaluation methods for computed tomography scanners - Part 4: Evaluation of imaging performance under automatic exposure control".
Its scope clause reads: This document describes the automatic exposure control technology used in X-ray computed tomography equipment (hereinafter referred to as CT scanner).
The corresponding imaging performance evaluation method is proposed. This document applies to whole-body and special-purpose CT scanning devices, including CT scanning devices that provide image data for radiation therapy planning. Its clauses include terms and definitions.
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Document preview — YY/T 1766.4-2024
National Standard of the People's Republic of China
- ICS
- 11.040.50
- Classification
- C43
Issued by: National Medical Products Administration
Contents
- Preface
- Introduction
- 1 Scope
- 2 Normative references
- 3 Terms and Definitions
- 4 Imaging conditions related to CT automatic exposure control
- 5 Imaging performance evaluation method under X-ray tube current modulation
- 6 Performance Evaluation of Automatic Exposure Control
- Appendix A (Informative) Implementation of Tube Current Modulation Technology
- Appendix B (Informative) Image performance evaluation under X-ray tube current modulation
1 Scope
This document describes the automatic exposure control technology used in X-ray computed tomography equipment (hereinafter referred to as CT scanner).
The corresponding imaging performance evaluation method is proposed.
This document applies to whole-body and special-purpose CT scanning devices, including CT scanning devices that provide image data for radiation therapy planning.
2 Normative references
The contents of the following documents constitute the essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to
This document.
GB 9706.103-2020 Medical electrical equipment Part 1-3.General requirements for basic safety and essential performance Collateral standard.
Radiation protection for diagnostic X-ray equipment
GB 9706.244 Medical electrical equipment Part 2-44.Basic safety and essential performance safety of X-ray computed tomography equipment
Fully dedicated requirements
GB/T 10149 Terminology and symbols for medical X-ray equipment
GB/T 19042.5 Evaluation and routine testing of medical imaging departments Part 3-5.X-ray computed tomography equipment imaging
Performance acceptance test and stability test
YY/T 1821 Calculation method for body-size-specific dose estimation of X-ray computed tomography equipment
3 Terms and definitions
GB/T 10149, GB 9706.103-2020, GB 9706.244, GB/T 19042.5 and YY/T 1821 and the following terms
The following terms and definitions apply to this document.
3.1
In X-ray equipment, the process of automatically controlling one or more loading factors to obtain the required radiation dose at a preselected location.
model.
[Source. GB 9706.103-2020, 3.10]
3.2
In X-ray equipment, an operating mode in which the X-ray tube current is automatically modulated to obtain the required radiation dose at a preselected position.
3.3
An optimized constant X-ray flux can be determined for exposure control throughout the scanning sequence.
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 21 pages — is available in the English PDF.
Referenced standards
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Related Standards
GB 9706.103-2020 — Medical electrical equipment - Part 1-3: General requirements for basic safety and essential performance. Collateral Standard: Radiation protection in diagnostic X-ray equipment
YY/T 1766.1-2021 — Image quality evaluation methods for computed tomography system - Part 1: Modulation transfer function evaluation
YY/T 1766.2-2021 — Image quality evaluation methods for computed tomography system - Part 2: Low contrast resolution evaluation
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YY/T 1766.4-2024
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