Medical diagnostic ultrasonic imaging system using coded transmit pulses
US6213947A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 31, 1999 |
| Grant date | Apr 10, 2001 |
| Priority date | — |
| Expiry date | Mar 31, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S15/8961
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Coded transmit signals are used in medical diagnostic ultrasonic imaging systems. In one mode, first and second ultrasonic beams are launched into a body along first and second spatially distinct transmit beam directions and used with B-mode or motion detection processing. The two beams are coded with unique, preferably orthogonal, spatially invariant, nonlinear phase modulation codes and the second beam is launched before the first beam has left the tissue. The first and second transmit beams may be included in a single transmit event. Frame rates are improved. Multiple spectral Doppler images from independent gates are generated. In another mode, first and second uniquely coded ultrasonic beams are launched into a body to focus at substantially the same point such that the two beams sample motion at different times. Unconventionally high velocity parameters are estimated and other motion parameters, including velocity parameters, may be estimated with improved accuracy. In yet another mode, first and second uniquely coded ultrasonic beams are launched into a body to focus preferentially at the same point where each beam originates from a subaperture and the receive signals are us…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.