Median temporal filtering of ultrasonic data
US5413105A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 9, 1994 |
| Grant date | May 9, 1995 |
| Priority date | — |
| Expiry date | May 9, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S7/52028
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method and apparatus of processing signals in an ultrasonic imaging system for imaging a living subject. The ultrasonic imaging system including an ultrasonic emitter, receptor and display. N temporally-spaced signals from ultrasound produced by a plurality of temporally-spaced referenced pulses are obtained and the amplitude (power) of each of the N temporally-spaced signals is determined. In various embodiments, N is an odd integer, usually, 1, 3, 5 or 7, depending on a user-setting. A median temporal signal of the N amplitude signals is then obtained. In implemented embodiments, the median is obtained by sorting a list of the N amplitude signals until (N+1)/2 signals have been sorted. The median is temporally filtered with a previous signal displayed on the display of the ultrasonic imaging system, wherein the temporal filtering including a filtering coefficient having a magnitude approximating a cardiac cycle of the living subject. Such processing is especially useful for angiography studies, wherein artifacts are removed providing a higher-quality image than in the prior art.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.