US 12,343,204 B2
Systems and methods for localizing a medical device using symmetric doppler frequency shifts measured with ultrasound imaging
Mostafa Fatemi, Rochester, MN (US); Azra Alizad, Rochester, MN (US); Marek Belohlavek, Scottsdale, AZ (US); and Viksit Kumar, Rochester, MN (US)
Assigned to Mayo Foundation for Medical Education and Research, Rochester, MN (US)
Filed by Mayo Foundation for Medical Education and Research, Rochester, MN (US)
Filed on Mar. 22, 2023, as Appl. No. 18/188,308.
Application 18/188,308 is a division of application No. 16/577,194, filed on Sep. 20, 2019, granted, now 11,642,100.
Claims priority of provisional application 62/733,931, filed on Sep. 20, 2018.
Prior Publication US 2023/0240649 A1, Aug. 3, 2023
Int. Cl. A61B 8/00 (2006.01); A61B 5/00 (2006.01); A61B 8/08 (2006.01); A61B 34/20 (2016.01); A61B 90/00 (2016.01)
CPC A61B 8/4245 (2013.01) [A61B 8/0841 (2013.01); A61B 8/4488 (2013.01); A61B 8/488 (2013.01); A61B 90/37 (2016.02); A61B 5/7257 (2013.01); A61B 2034/2063 (2016.02); A61B 2090/364 (2016.02); A61B 2090/378 (2016.02)] 2 Claims
OG exemplary drawing
 
1. A method for localizing a medical device using an ultrasound imaging system, the steps of the method comprising:
(a) acquiring Doppler signal data representative of a medical device having coupled thereto an active element that is transmitting acoustic energy at an active element excitation frequency while the Doppler signal data are acquired;
(b) generating with a computer system, time domain data based on the Doppler signal data;
(c) modulating the time domain data using the active element excitation frequency to create a first resultant modulated signal;
(d) modulating the time domain data using the active element excitation frequency to create a second resultant modulated signal;
(e) isolating positive Doppler shifts in the time domain data based on a first combination of the first and second modulated signals using the computer system;
(f) isolating negative Doppler shifts in the time domain data based on a second combination of the first and second modulated signals using the computer system;
(g) identifying spatial locations as being associated with a location of the active element by implementing a mean frequency estimator with a hardware processor and a memory of the computer system, wherein the mean frequency estimator takes as an input the isolated positive Doppler shifts and the isolated negative Doppler shifts in the time domain; and
(h) generating with the computer system, a display that provides a visual depiction of the spatial locations associated with the location of the active element.