Count accuracy control means for a blood analyses system
US4706207A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 24, 1985 |
| Grant date | Nov 10, 1987 |
| Priority date | — |
| Expiry date | Jun 24, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2035/00316
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus for making blood counts is provided with computer and instrument control to optimize performance of the apparatus. Means for counting blood cells such as platelets, white blood and red blood cells enables a plot of the number of particles counted in each of the adjacent bands or channels inclusive within a selected range of particle size so that a plot of count against particle size may be made. The computer enables analyses of plots thus obtained by system algorithms in order to correct errors of various types which may occur in the plot. For example, by calculating the logarithms of the counts of particles and of mean particle size for each particle size channel, a further plot of log count against log of blood particle size of generally symmetrical bell shape may be generated. The computer further calculates change of logarithm (.DELTA. log) of counts in adjacent channels. A straight line of fixed slope is then plotted representing the change of logarithm counts against the logarithm of blood particle size, giving more weight to those points near the peak. The calculation steps are reversed using the points on the straight line for ultimately calculating counts in t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.