Angioscopic system and method for dimensional measurement including measurement of the distance from angioscopic ends to designated planes
US5036463A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 23, 1988 |
| Grant date | Jul 30, 1991 |
| Priority date | — |
| Expiry date | Nov 23, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2013/0081
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An angioscopic system includes image processing so as to determine the dimensions of an unknown dimensional feature within the field of view of the angioscope. The system is calibrated by placing a series of known images at known separation distances from the tip of the angioscope and measuring the size of the image which is produced upon a video monitor. This provides a series of data indicating the relationship between the actual size of the feature, the apparent size in pixels on the image, and the known separation distance from the tip of the scope to the feature plane in which the dimensional feature is disposed. Collection of this data allows one to generate, by curve fitting techniques, a functional relationship such that the size of an unknown dimensional feature may be determined when the angioscope is used upon an actual patient. The coefficients generated by the calibration technique are stored in the computer and called up during the measurement process which involves viewing a scene from several different points and using a Newton-Jordan or other minimization technique in order to generate the actual area or other dimensional aspect of the feature of interest. A modifi…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.