WS 521-2017 in English
SUPERSEDEDSpecification for testing of quality control in medical digital radiography(DR)systems
- Issued on:2017-04-10
- Implemented on:2017-10-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$311.00
本标准规定了医用数字X射线摄影（DR）系统质量控制检测要求、检测项目和方法。
本标准适用于医用数字X射线摄影（DR）系统的质量控制检测，包括采用线阵或面阵扫描影像探测器的DR系统。
本标准不适用于乳腺数字X射线摄影（乳腺DR）、牙科数字X射线摄影、数字双能摄影和数字体层合成摄影的质量控制检测。
Introduction
Standard Overview and Technical Background
WS521-2017 is a quality control test specification developed in my country for medical digital radiography (DR) systems, replacing the testing standards for traditional X-ray machines. This standard is based on the International Electrotechnical Commission (IEC) 61223 series of standards and incorporates the specific clinical application characteristics of DR equipment in my country.
Core Test Items and Technical Indicators
| Test Items | Technical Requirements | Test Methods |
|---|---|---|
| Detector Dose Indicator (DDI) | ±20% Error Range | Tested using 10μGy Incident Dose |
| Signal Transfer Characteristics (STP) | R²≥0.98 | 1-30μGy Multiple Dose Point Test |
| Low Contrast Resolution | ≤5% Coefficient of Variation | 4cm×4cm ROI Analysis |
Key Technological Innovations
1. Dynamic Range Test: The DR system is required to maintain a linear response (R²≥0.98) within the dose range of 1-30μGy, a 3% improvement over the 0.95 requirement of traditional equipment.
2. Spatial Resolution Test: Using Nyquist frequency evaluation, the Modulation Transfer Function (MTF) is required to be ≥80% at ≥5lp/mm.
3. Automatic Exposure Control (AEC): Three new operating mode tests are added, with the error required to be controlled within ±25%.
Implementation Recommendations
- During the acceptance of new equipment, all 18 basic tests should be completed according to Appendix A.
- Quarterly maintenance focuses on testing six core indicators, including DDI, STP, and uniformity
- It is recommended to use dedicated test phantoms such as CDRAD2.0 or DIGI-13
- Establish an electronic archive of test data to implement trend analysis and early warning
Technology Evolution Analysis
Compared with the 2010 version of the standard, WS521-2017 has the following major improvements:
- Added Flat Panel Detector firmware version compatibility test
- Included AEC response time as a mandatory test item
- Introduced the DICOM GSDF standard for display consistency evaluation
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