研究目的
To analyze edge detection and optical contrast calculation of light field-indicators used in X-ray via automated- and observer-based methods, and comparison with current standard approaches, which do not give exact definition for light field edge determination.
研究成果
The study proposes a more exact edge definition of the X-ray light field, corresponding well to the average human observer’s edge determination. The new edge definition method with automated systems would reduce human variability in edge determination, potentially leading to more precise light field calibration and reduced irradiation doses on radiology patients.
研究不足
The study highlights the large inter-observer variation in edge determination and the lack of a clear edge definition in current standards, which could affect the approval of X-ray equipment and increase radiation dose. The proposed automated measurement method aims to reduce these human-induced variations.
1：Experimental Design and Method Selection:
The study employed an automated light sensor array to measure the penumbra zone of the edge in standard X-ray equipment and compared these measurements with those made by trained and na?ve human observers.
2：Sample Selection and Data Sources:
Twenty-eight observers with no visual problems and good or corrected visual acuity participated in the manual tests.
3：List of Experimental Equipment and Materials:
A photodiode array sensor with 16 elements, an integrated illuminance meter, pre-amplifiers, an ARDUINO MEGA microcontroller board, and a LabVIEW software for control and analysis.
4：Experimental Procedures and Operational Workflow:
The automated process was performed in a dark room, and the manual process involved observers marking the edges of the light field on a millimeter paper.
5：Data Analysis Methods:
Different interpretations of the contrast were calculated and compared, including edge definitions at 10%, 50%, and 25% of the maximum illuminance value.
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