Method and device for eliminating flat panel detector line noise

Abstract

The invention discloses a method and device for eliminating flat panel detector line noise. The method comprises the following steps: firstly conducting lowpass filtering processing in the horizontal direction on an original picture with the line noise, and eliminating quantum noise and circuit noise; then conducting smoothing processing in the vertical direction on the picture after lowpass filtering processing; obtaining a line noise picture by utilizing the picture after smoothing processing and the original picture; conducting estimation on each row of line noise according to the obtained line noise picture; eliminating the line noise according to all pixel points of each row on the basis of the estimation of the line noise of the same row. According to the method, the details of the picture will not be lost while the line noise is effectively eliminated, edges and resolution can be well kept, and meanwhile image artifacts will not be brought in. Therefore, authenticity of the picture is guaranteed.

Description

technical field [0001] The invention relates to the technical field of medical image processing, in particular to a method and device for eliminating line noise of a flat panel detector. Background technique [0002] At present, in the field of medical image processing technology, flat panel detectors use amorphous selenium to directly convert X-rays into charges or use fluorescent materials (such as CsI) to convert X-rays into visible light and then convert them into charges through amorphous silicon. The charges are stored using a TFT (Thin Film Transistor, Thin Film Field Effect Transistor) matrix. For the charges stored in the TFT, generally, the driving circuit applies a driving voltage to the TFT matrix row by row, so as to read out the data of one row. During the row-by-row reading process, due to the random fluctuation of the driving voltage and other reasons, the current intensity between the rows is not consistent, and the final image appears as horizontal stripe n...

AI Technical Summary

Problems solved by technology

This type of method will cause smooth edges in the vertical direction of the image, and even artifacts will appear on sharp edges, reducing the resolution of the image; strip artifacts will appear in relatively strong horizontal edge areas

[0004] It can be seen that the existing technical solutions for eliminating line noise still need further improvement. The existing technical solutions cannot remove line noise well, and even cause artifacts or reduce the quality of images while eliminating noise.

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