Examined body interior information observing apparatus by using photo-pulses controlling gains for depths
US5305759A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 14, 1991 |
| Grant date | Apr 26, 1994 |
| Priority date | — |
| Expiry date | May 14, 2011 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B2562/0242
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A photo-pulse from a photo-pulse generating apparatus is branched, where one branch is radiated to an examined body and the reflected light reflected within the examined body is delayed in time in proportion to the depth from the surface of the examined body and is led to a time-analyzing reflected light measuring apparatus. In this measuring apparatus, the other branched reference photo-pulse or reference signal pulse is input as delayed by the time for which the photo-pulse reflected within the examined body returns and only the reflected light component synchronized with the entering timing of this reference light pulse is analyzed in the time and is detected. By varying the detection sensitivity of this measuring apparatus in response to the depth from the surface of the examined body, the interior can be observed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.