Optimization of MTF and DQE in magnification radiography: a theoretical analysis

Chris C. Shaw; Xinming Liu; Michael R. Lemacks; John X. Rong; Gary J. Whitman

doi:10.1117/12.384522

25 April 2000 Optimization of MTF and DQE in magnification radiography: a theoretical analysis

Chris C. Shaw, Xinming Liu, Michael R. Lemacks, John X. Rong, Gary J. Whitman

Proceedings Volume 3977, Medical Imaging 2000: Physics of Medical Imaging; (2000) https://doi.org/10.1117/12.384522
Event: Medical Imaging 2000, 2000, San Diego, CA, United States

Abstract

MTFs and focal spot intensity profiles were modeled as Gaussian functions. The overall resolution limits of the MTF were derived as a function of the magnification factor, detector resolution limit and focal spot size. The MTF and NPS for a small field digital mammography system was measured and used to compute NEQ for various magnification factors. Computation of DQE is discussed. Images of simulated microcalcification cluster were acquired and used to demonstrate the improvement of low contrast detectability in magnification imaging. It was shown that MTF improves with magnification when the detector MTF is low. The improvement decreases as the detector MTF increases. It was observed that at low to medium frequencies, the MTF improvement would be limited by the focal spot blurring effect while at high frequencies, the MTF improves with all magnification factors. The NEQ was found to improve with magnification factor. The microcalcification detectability was also found to improve as the magnification is increased.

Citation Download Citation

Chris C. Shaw, Xinming Liu, Michael R. Lemacks, John X. Rong, and Gary J. Whitman "Optimization of MTF and DQE in magnification radiography: a theoretical analysis", Proc. SPIE 3977, Medical Imaging 2000: Physics of Medical Imaging, (25 April 2000); https://doi.org/10.1117/12.384522

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