# US 7,611,464 B2 · Method for processing Doppler signal gaps > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,611,464 B2 - Document ID: US7611464B2 - Status: Granted - Kind: B2 - Application number: 11/323,839 - Filed: 2005-12-30 - Published: 2007-03-01 - Granted: 2009-11-03 - Earliest claimed: 2005-08-16 - Assignees: Shenzhen Mindray Bio-Medical Electronics Co., Ltd. - Inventors: Yong Li - Web page: https://patentgrep.com/patent/US7611464B2 ## CPC - G01S 15/8979: {Combined Doppler and pulse-echo imaging systems} - G01S 7/5206: {Two-dimensional coordinated display of distance and direction; B-scan display} - G01S 7/52085: {Details related to the ultrasound signal acquisition, e.g. scan sequences (control of medical diagnostic ultrasound devices A61B8/54)} - G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES ## Abstract A method for processing Doppler signal gaps may include receiving Doppler signals during Doppler signal acquisition to obtain data of in-phase (I) component and quadrate (Q) component signals of the Doppler signals. The method may also include receiving interruption of the Doppler signals and estimating the data of the Doppler signals interrupted in the gap period filling the interrupted Doppler signals with the data of the estimated Doppler signals so that the data of the I and Q component signals in the gap period are filled to form a continuous output. The method may further include generating Doppler spectrum data or Doppler sound based on the data of the filled I and Q component signals. ## Claims ### Claim 1 A method for processing Doppler signal gaps, the method comprising the steps of: receiving Doppler signals during Doppler signal acquisition to obtain data of in-phase (I) component and quadrate (Q) component signals of the Doppler signals; receiving interruption of the Doppler signals indicating that the output of the data of said I and Q component signals is interrupted in a gap period, wherein the output of the data of said I and Q component signals is continuous both before and after the gap period; filtering the received Doppler signals using a high pass filter; estimating the data of the Doppler signals interrupted in said gap period based on the filtered Doppler signals received during Doppler signal acquisition; filling the interrupted Doppler signals with the data of the estimated Doppler signals so that the data of the I and Q component signals in said gap period are filled to form a continuous output; wall filtering the continuous output of the data of the filled I and Q component signals; and generating Doppler spectrum data or Doppler sound based on the wall filtered data of the filled I and Q component signals. ### Claim 2 (depends on 1) The method according to claim 1, wherein in the filling step, the whole gap is divided into at least two time intervals; and the data of the interrupted Doppler signal in different time intervals are filled with the data of Doppler signals before and after the gap, respectively. ### Claim 3 (depends on 1) The method according to claim 1, wherein in said filling step, a predetermined filling data is repeatedly output in a predetermined gap time interval to be filled. ### Claim 4 (depends on 3) The method according to claim 3, wherein the time interval to which the predetermined filling data belongs is shorter than the time interval to be filled. ### Claim 5 (depends on 3) The method according to claim 3, wherein said filling step further comprises weighting the data of the Doppler signals so as to smooth the Doppler data in beginning, intermediate and end time intervals of said gap, caused by the repeated output of the predetermined filling data. ### Claim 6 (depends on 5) The method according to claim 5, wherein said weighting step comprises processing the data of the Doppler signals by a window function. ### Claim 7 (depends on 1) The method according to claim 1, further comprising initializing said high pass filter to reduce the transient response time of said high pass filter, so as to shorten the gap period. ### Claim 8 (depends on 7) The method according to claim 7, wherein said high pass filter includes a second-order IIR filter. ### Claim 9 An ultrasonic scanning synchronous display system, the system comprising: means for receiving Doppler signals during Doppler signal acquisition to obtain data of in-phase (I) component and quadrate (Q) component signals of the Doppler signals; means for receiving interruption of the Doppler signals, in which the output of the data of said I and Q component signals is interrupted and in a gap period, wherein the output of the data of said I and Q component signals is continuous both before and after the gap period; means for estimating the data of the Doppler signals interrupted in said gap period based on the Doppler signals received during Doppler signal acquisition, wherein said means for estimating includes a first filtering means for filtering the received Doppler signals; means for filling the interrupted Doppler signals with the filtered data of the estimated Doppler signals so that the data of the I and Q component signals in said gap period are filled to form a continuous output; second filtering means for filtering the continuous output of the data of the filled I and Q component signals; and means for generating Doppler spectrum data or Doppler sound based on the data of the filled I and Q component signals that has been filtered by the second filtering means. ### Claim 10 (depends on 9) The system according to claim 9, wherein the filling means divides the whole gap into at least two time intervals; and fills the data of the interrupted Doppler signal in different time intervals with the filtered data of Doppler signals before and after the gap, respectively. ### Claim 11 (depends on 9) The system according to claim 9, wherein said filling means repeatedly outputs a predetermined filling data in a predetermined gap time interval to be filled. ### Claim 12 (depends on 11) The system according to claim 11, wherein said filling means further comprises means for weighting the data of the Doppler signals so as to smooth the Doppler data in beginning, intermediate and end time intervals of said gap, caused by the repeated output of the predetermined filling data. ### Claim 13 (depends on 12) The system according to claim 12, wherein said weighting means comprises means for processing the data of the Doppler signals by a window function. ### Claim 14 (depends on 9) The system according to claim 9, wherein the first filtering means comprises an initialized high pass filter for filtering the received Doppler signals to reduce the transient response time of said high pass filter, so as to shorten the gap period. ### Claim 15 (depends on 14) The system according to claim 14, wherein said high pass filter includes a second-order IIR filter.