Method for accurately measuring modulation transfer function of digital X-ray imaging system

Abstract

The invention belongs to the fields of biomedical engineering and computers and relates to a method for accurately measuring a modulation transfer function (MTF) of a digital X-ray imaging system. The method comprises the steps of: placing a simulated fat body, collecting a plurality of images, and calculating a noise power spectrum of integral noises of the system; placing a lead plate for covering a detector, acquiring a plurality of images and calculating an electronic noise power spectrum of the system; placing a line pair card, collecting a plurality of images, and overlaying and averaging all the images to obtain an average image of the line pair card; acquiring a strength profile map by means of the average image of the line pair card, and calculating an MTF value corresponding to an integer spatial frequency of the line pair card; and calculating the noise power spectrum and a related coefficient eta of the MTF by utilizing a linear regression method to obtain an MTF change curve of the imaging system under a spatial frequency range. The method provided by the invention can be used for realizing the accurate measurement of the MTF of the digital X-ray imaging system and provides powerful conditions for further and all-around evaluation of the performance of the radiological imaging system.

Description

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AI Technical Summary

Benefits of technology

This patented technology provides a way to measure how well two different types of systems work together when they are used with radiation therapy equipment (X). By analyzing these measurements it becomes possible to determine if there're any problems or issues that may affect patient outcomes during treatment. It also helps evaluate the effectiveness of various treatments such as intensity adjustment and beam shaping techniques. Overall this innovation allows better understanding and evaluation of medical images from x ray fluoroscopy data collected through computerized tomography scans.

Problems solved by technology

This patented technical problem addressed in this patents relates to improving the precision and reliance of evaluating the properties of digital x- ray images without being influenced from external influences like human visual sensitivity. Current techniques involve calculating specific parameters called MFT' s value(MTF). These measurements require complicated calculations involving multiple variables including position space coordinates, material property coefficients, and spectral distribution functions. There currently exist various ways to overcome these issues, but they all suffer limitations when applied to complex models containing many degrees of freedom.

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