研究目的
To adapt the transmission-based MTF techniques to the prototype backscatter imaging system and to utilize the established MTF measurement techniques in order to quantitatively compare different system designs and ultimately determine which combination leads to the optimal system performance.
研究成果
The study successfully adapted the transmission-based MTF techniques to the prototype backscatter imaging system. The MTF measurements indicated the importance of target design and positioning in achieving accurate results for a backscatter radiography system. The edge method results were higher than the bar pattern method, but the difference in magnitude was less than 0.1.
研究不足
The bar pattern method's limitations include the application of the Coltman approximation which assumes an infinite number of bars in the target and is derived for an analog, continuous imaging system. The edge method is sensitive to noise and requires careful alignment of the edge with respect to the beam axis.
1：Experimental Design and Method Selection:
Adapted the transmission-based MTF techniques to the prototype backscatter imaging system using the bar pattern and edge technique.
2：Sample Selection and Data Sources:
Constructed test tools specifically for the backscatter system to carry out MTF measurements.
3：List of Experimental Equipment and Materials:
Used a prototype CBI system consisting of an x-ray tube, high-voltage generator, linear detector array, source and detector collimators, position encoder, and a laptop computer.
4：Experimental Procedures and Operational Workflow:
Images were taken of the bar pattern targets and the edge boundary, then transferred to Matlab for image processing.
5：Data Analysis Methods:
Intensity profiles were obtained by drawing a rectangular region-of-interest (ROI) over the line-pairs in the backscatter image for the bar pattern method. For the edge method, a ROI was extracted from the image and the edge response was oversampled.
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