Use of MTF calculation in global and local resolution assessment in digital mammography

Frank Rogge; Hilde Bosmans; Peter Willems; Guy Marchal

doi:10.1117/12.480008

5 June 2003 Use of MTF calculation in global and local resolution assessment in digital mammography

Frank Rogge, Hilde Bosmans, Peter Willems, Guy Marchal

Proceedings Volume 5030, Medical Imaging 2003: Physics of Medical Imaging; (2003) https://doi.org/10.1117/12.480008
Event: Medical Imaging 2003, 2003, San Diego, California, United States

Abstract

The purpose of this study is to propose a test procedure for global and local resolution assessment in digital mammography to detect sharpness problems. The MTF calculation was based on the presampled edge method. In a first phase, we compared the effect of geometry and exposure conditions on the MTF. Results were: (1) the MTF was reproducible; (2) MTF data can be corrected for edge angle; (3) scatter conditions have significant influence; (4) edge position in the detector plane has negligible influence; (5) the required edge length for our algorithm is longer than the critical length to get rid of noise effects; (6) exposure conditions have no major influence except at very low dose levels. We propose to approximate clinical working conditions for the global MTF-check, with an edge-object embedded in 45mm PMMA and clinical exposures. Localized MTF calculations with this phantom and software can be automated for QA by the medical physicist. For sharpness analysis all over the detector, we designed a test-object with oblique, parallel bars and automatic software tools are being developed. By means of software simulations, local variations in the sharpness could be detected. Validation in practice and further automation of the software tools is ongoing.

Citation Download Citation

Frank Rogge, Hilde Bosmans, Peter Willems, and Guy Marchal "Use of MTF calculation in global and local resolution assessment in digital mammography", Proc. SPIE 5030, Medical Imaging 2003: Physics of Medical Imaging, (5 June 2003); https://doi.org/10.1117/12.480008

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available