• The measurement and evaluation...

Treffer: The measurement and evaluation of the modulation transfer function (MTF) of mammography systems at a major teaching hospital in Malta

Title:
The measurement and evaluation of the modulation transfer function (MTF) of mammography systems at a major teaching hospital in Malta
Authors:
Wang, Zhehao (2024)
Publisher Information:
University of Malta
Faculty of Science. Department of Physics
Publication Year:
2024
Collection:
University of Malta: OAR@UM / L-Università ta' Malta
Subject Terms:
Breast -- Radiography -- Malta, Radiography, Medical -- Malta, Diagnostic imaging -- Data processing
Document Type:
Dissertation bachelor thesis
Language:
English
Relation:
Wang, Z. (2024). The measurement and evaluation of the modulation transfer function (MTF) of mammography systems at a major teaching hospital in Malta (Bachelor's dissertation).; https://www.um.edu.mt/library/oar/handle/123456789/127682
Availability:
https://www.um.edu.mt/library/oar/handle/123456789/127682
Rights:
info:eu-repo/semantics/restrictedAccess ; The copyright of this work belongs to the author(s)/publisher. The rights of this work are as defined by the appropriate Copyright Legislation or as modified by any successive legislation. Users may access this work and can make use of the information contained in accordance with the Copyright Legislation provided that the author must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the prior permission of the copyright holder.
Accession Number:
edsbas.FCEEB61F
Database:
BASE

Weitere Informationen

B.Sc. (Hons)(Melit.) ; Background: Modulation transfer function (MTF) is a quantitative metric of image quality in evaluating the spatial resolution of a medical imaging device. The MTF describes the loss in contrast between neighboring objects being imaged across different spatial frequencies. This allows for a quantitative assessment of the resolving ability of the imaging device, without the involvement of subjectivity, allowing detailed description of the performance of the imaging system via spatial resolution and allows comparison of performance between different mammography systems. Objectives: The scope of the project was to evaluate and study the variation of the MTF of a mammography system across different acquisition parameters i.e., tube voltage and current-time product with/without the aluminium filter. Research Methodology: The study involves imaging of the MTF phantom at different tube voltages and current-time product with and without the aluminium filter. The MTF placed at 40 mm above the breast support table via the polymethyl methacrylate (PMMA) blocks in the absence of the compression paddle. The MTF curves were obtained using the MTF plugin in the software ImageJ. The MTF curves were then, analyzed using Python to evaluate the spatial resolution of the mammography systems at different acquisition parameters and the associated errors, such that their significance could be studied. Results: The study showed the variation of the MTF curves at various acquisition parameters. The spatial resolution decreased with the increase of the tube voltage. The spatial resolution was shown to have very little, or no, effect from the current-time product. The application of filter on the mammography system enhanced the spatial resolution of the imaging device whilst reducing the magnitude of error associated with the MTF curves. Conclusions and recommendations: Results of the MTF show the possibility of an optimization process using the MTF as a metric to improve the sharpness in the acquired image whilst ...