| Autor: |
Shaw CG, Ergun DL, Myerowitz PD, Van Lysel MS, Mistretta CA, Zarnstorff WC, Crummy AB |
| Jazyk: |
angličtina |
| Zdroj: |
Radiology [Radiology] 1982 Jan; Vol. 142 (1), pp. 209-13. |
| DOI: |
10.1148/radiology.142.1.7031761 |
| Abstrakt: |
The logarithmic amplification of video signals and the availability of data in digital form make digital subtraction videoangiography a suitable tool for videodensitometric estimation of physiological quantities. A system for this purpose was implemented with a digital video image processor. However, it was found that the radiation scattering and veiling glare present in the image-intensified video must be removed to make meaningful quantitations. An algorithm to make such a correction was developed and is presented. With this correction, the videodensitometry system was calibrated with phantoms and used to measure the left ventricular ejection fraction of a canine heart. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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