Sep 12 – 17, 2021
University of Birmingham
Europe/London timezone

An experimental study on frequency-dependent noise-resolution trade-off of an indirect x-ray detector

Sep 15, 2021, 1:05 PM
Teaching and Learning Building (University of Birmingham)

Teaching and Learning Building

University of Birmingham

Edgbaston Campus University of Birmingham B15 2TT UK


Mr Hunwoo Lee (Yonsei University)


Noise and spatial resolution are two key intrinsic characteristics to describe the performance of an x-ray detector and quantified by the imaging performance metrics of noise power spectrum, modulation transfer function, and detective quantum efficiency (DQE). To improve two characteristics of an x-ray detector, image processing algorithms are widely used. However, there exists a trade-off between noise and spatial resolution due to the presence of noise-resolution uncertainty in imaging system. In this work, we investigated the influence of image processing on the frequency-dependent noise-resolution trade-off, which is defined as DQE multiplied by the ratio of a pixel size to spatial resolution, with different x-ray doses. We conducted an experiment using a tabletop setup and some linear image processing algorithms such as smoothing and sharpening filters. Measurements were made on a flat-panel detector, DR tech EVS 4343 at 70kVp. Experimental results showed that the frequency-dependent noise-resolution trade-off is hardly influenced by image processing and do not exceed the upper limit at a fixed incident x-ray dose.

Nationality South Korea
Institute Yonsei University
Your name Hunwoo Lee
Title Mr

Primary author

Mr Hunwoo Lee (Yonsei University)


Mr Jiyong Shim (Yonsei University) Mr Minjae Lee (Yonsei University) Prof. Hyosung Cho (Yonsei University)

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