Feasibility Of Selective Exposure Radiography

Bruce H Hasegawa; James T. Dobbins III; Walter W. Peppler; Jack T Cusma; Charles A, Mistretta; Bakki V Kudva; Michael S Van Lysel; Ching-Shan Lee; Shaikh Naimuddin; Jerry C Lancaster

doi:10.1117/12.939342

15 June 1984 Feasibility Of Selective Exposure Radiography

Bruce H Hasegawa, James T. Dobbins III, Walter W. Peppler, Jack T Cusma, Charles A, Mistretta, Bakki V Kudva, Michael S Van Lysel, Ching-Shan Lee, Shaikh Naimuddin, Jerry C Lancaster

Author Affiliations +

Proceedings Volume 0454, Application of Optical Instrumentation in Medicine XII; (1984) https://doi.org/10.1117/12.939342
Event: Application of Optical Instrumentation in Medicine XII, 1984, San Diego, United States

Abstract

The concept of selective exposure radiography encompasses those techniques which spatially modulate the incident x-ray field to produce a more uniform exit field arising from the patient. The resulting reduction in the dynamic range of the exposure field offers several advantages. In conventional radiography, selective exposure techniques allow all areas of the image to be placed in the linear portion of the film characteristic curve so that local contrast is maximized. With video systems, the reduction in dynamic range minimizes the impact of electronic noise behind the least transmissive regions of the patient. With both electronic and photographic detectors, selective exposure radiography is characterized by uniform quantum statistics and uniform scatter across the image. Several selective exposure techniques currently are being investigated. They include compensating filters placed manually in the x-ray field as well as fan-beam geometries in which the x-ray tube output is modulated with a feedback circuit to maintain constant exposure to the image receptor. At the University of Wisconsin, we have been investigating a digital system which uses an initial low-dose patient image to design an attenuator with transmission complimentary to that of the patient. The attenuator is fabricated for each patient and is positioned automatically in the x-ray beam prior to the acquisition of the final compensated image. The possible applications of this device include chest radiography, coronary angiography, subtraction angiography, and accurate digital videodensitometry.

Citation Download Citation

Bruce H Hasegawa, James T. Dobbins III, Walter W. Peppler, Jack T Cusma, Charles A, Mistretta, Bakki V Kudva, Michael S Van Lysel, Ching-Shan Lee, Shaikh Naimuddin, and Jerry C Lancaster "Feasibility Of Selective Exposure Radiography", Proc. SPIE 0454, Application of Optical Instrumentation in Medicine XII, (15 June 1984); https://doi.org/10.1117/12.939342

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