Evaluation Of The Contrast Ratio Of Intensified Fluoroscopic Imaging Systems
| Autor: | Raymond P. Rossi, Neil B. Bromberg |
|---|---|
| Rok vydání: | 1982 |
| Předmět: |
medicine.diagnostic_test
business.industry Image quality Computer science media_common.quotation_subject Photography Image intensifier Image processing law.invention Optics law medicine Fluoroscopy Contrast (vision) Computer vision Contrast ratio Spatial frequency Artificial intelligence business media_common |
| Zdroj: | SPIE Proceedings. |
| ISSN: | 0277-786X |
| DOI: | 10.1117/12.933833 |
| Popis: | Large area contrast loss in image intensifiers results in reduced performance at low spatial frequencies and may limit the imaging capabilities of such systems for structures of clinical interest having inherently low subject contrast. The contrast ratio of image intensifiers is a measure of large area contrast loss which may be evaluated under laboratory conditions by photometric techniques. Unfortunately such techniques are not readily extended to clinically installed systems. A technique for the measurement of contrast ratio on clinically installed systems, incorporating a film recording camera, is proposed which eliminates the requirement of having a precise knowledge of the film's characteristic curve. The results of measurements obtained with this technique on clinical systems, as well as comparison of this technique to photometric measurements under laboratory conditions are presented, along with a discussion of the associate problems and pitfalls. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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