Geometric averaging of X-ray signals in automatic exposure control


Snoeren, R.M. & With, de, P.H.N. (2010). Geometric averaging of X-ray signals in automatic exposure control. Proceedings of the 2010 17th IEEE International Conference on Image Processing (ICIP), 26-29 September 2010, Hong Kong (pp. 3525-3528). Piscataway: Institute of Electrical and Electronics Engineers (IEEE). In Scopus Cited 1 times.

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Improper dose control in X-ray cardio-vascular systems leads to a reduced Signal-to-Noise Ratio (SNR) in regions of interest of the X-ray image. We aim at reducing the influence of direct radiation, entering a measuring field for X-ray dose control in a Flat Detector which gives too bright areas (highlights) in the image. It is our desire to use a norm-like signal size that represents a minimal dose value while maximizing information transfer and thus image quality. In a dose control system, it is common practice to employ a special averaging technique for computing a representative signal level controlling the X-ray. We have found that the geometric averaging outperforms the existing techniques and significantly improves the image quality. Our approach reduces the highlight influence and guarantees an adequate Contrast-to-Noise ratio for decentered objects. We provide convincing experimental results showing a strongly improved image quality with respect to contrast and detail.