WS 520-2017 in English
SUPERSEDEDSpecification for testing of quality control in computed radiography (CR)
- Issued on:2017-04-10
- Implemented on:2017-10-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$262.00
本标准规定了计算机X射线摄影（CR）质量控制检测要求、检验项目和方法。
本标准适用于医用计算机X射线摄影（CR）的质量控制检测。
本标准不适用于乳腺和牙科专用计算机X射线摄影的质量控制检测。
Introduction
Standard Framework and Technological Evolution
As an upgraded version of GBZ187-2007, WS520-2017 mainly puts forward new requirements for quality control testing of Computed Radiography (CR) systems. The standard revision focuses on three dimensions:
| Technical dimension | GBZ187-2007 | WS520-2017 |
|---|---|---|
| Image plate (IP) test | Basic performance test | Added six indicators including IP consistency and residual signal |
| Spatial resolution | Nyquist frequency calculation | Requirement: measured value ≥ 90% of theoretical value |
| Dose indication | Simple dose response | Added 3 dose levels (1/10/100μGy) calibration verification |
Analysis of core test items
1. Imaging board performance test
The standard requires three key tests for IP:
- Basic performance: including sensitivity consistency (±10%) and background noise (≤0.3OD)
- Dose response: Verify 1-100μGy linearity at 80kVp
- Residual signal: No residue is detected at 10μGy after 500μGy exposure
2. Spatial resolution verification
When using line pair card testing, the following must be met:
Actual case: When the nominal Nyquist frequency of the CR system is 3.3lp/mm, the measured MTF value at 3lp/mm should be ≥2.97(3×0.9)
Implementation points
Test environment requirements
The standard specifically emphasizes:
- SID must be maintained at 180cm (except for special terms)
- Use standard filtration (0.5mmCu+1mmAl)
- Ambient temperature is controlled at 23±5℃
Equipment calibration cycle
The following quality control frequency is recommended:
| Test items | Acceptance test | Quarterly inspection |
|---|---|---|
| IP Consistency | Required | Required |
| Dose Indication Error | Required | Optional |
| Spatial Resolution | Required | Required |
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