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Related Experiment Video

Updated: Jun 25, 2025

Detection of Architectural Distortion in Prior Mammograms via Analysis of Oriented Patterns

Detection of Architectural Distortion in Prior Mammograms via Analysis of Oriented Patterns

Published on: August 30, 2013

PSF and MTF from a bar pattern in digital mammography.

F R Lozano¹, Daniel Rojo¹, L C Martínez¹

¹Hospital Universitario 12 de Octubre, Madrid, Spain.

Biomedical Physics & Engineering Express

|May 31, 2024

Summary

A new quantitative method simplifies determining the point spread function (PSF) and modulation transfer function (MTF) for digital mammography systems using bar patterns. This accessible approach aids resource-limited hospitals in quality control and performance assessment.

Keywords:

CTF MTF PSF bar pattern contents mammography printed running title x2

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Last Updated: Jun 25, 2025

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Published on: October 27, 2023

Area of Science:

Medical Imaging
Radiology
Quality Assurance

Background:

Determining Modulation Transfer Function (MTF) in digital mammography is challenging in hospitals due to resource limitations.
Existing methods often require specialized equipment or complex procedures, hindering routine clinical application.

Purpose of the Study:

To propose a quantitative, accessible method for calculating the Point Spread Function (PSF) and MTF of digital mammography systems.
To enable accurate system performance evaluation using readily available bar pattern images.

Main Methods:

The method involves measuring the Contrast Transfer Function (CTF) from a bar pattern image.
A theoretical PSF model is iteratively adjusted to match the experimental CTF, derived via convolution with a square wave.
The MTF is obtained by Fourier transforming the derived PSF.

Main Results:

The proposed method demonstrated good agreement (within 5%) for CTF calculations across three digital mammography systems compared to the PSF model.
Comparisons of MTF derived from the model PSF and a gold wire method validated the accuracy of the PSF model.

Conclusions:

The developed method provides a simple, accessible means to obtain PSF and MTF for digital mammography systems in clinical settings.
This technique bypasses the need for complex configurations or hard-to-access phantoms.
The method can be extended to calculate other crucial imaging parameters like Normalized Noise Power Spectrum (NNPS) and Detective Quantum Efficiency (DQE).