Tomographic Filters For Digital Radiography

Jose M. Costa

doi:10.1117/12.933024

4 November 1981 Tomographic Filters For Digital Radiography

Jose M. Costa

Proceedings Volume 0314, Digital Radiography; (1981) https://doi.org/10.1117/12.933024
Event: Conference on Digital Radiography, 1981, Palo Alto, United States

Abstract

Conventional radiographs (digitized or not) do not provide information about the depths of details and structures because they are two-dimensional projections of three-dimensional bodies. Taking advantage of the finite size of the X-ray source and the divergent nature of the X-ray beam, a radiograph can be processed by two-dimensional digital filtering techniques, so that the image of a particular layer is improved, while the others are degraded. This technique is referred to as a Tomographic Filtration Process (TFP). This paper explains the mathematical and physical foundations of the method and the engineering considerations in the design and realization of tomographic filters. Theoretical comparisons between conventional radiography, standard tomography and tomographic filtering are discussed in terms of the thickness of the tomographic layer, the rate of change of the Modulation Transfer Function (MTF) and the signal to noise ratios. Finally, experimental results are shown to demonstrate the effect of tomographic filtering at different depths.

Citation Download Citation

Jose M. Costa "Tomographic Filters For Digital Radiography", Proc. SPIE 0314, Digital Radiography, (4 November 1981); https://doi.org/10.1117/12.933024

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