US 12,332,331 B2
Pulse sequences and frequency sweep pulses for single-sided magnetic resonance imaging
Muller Francis De Matos Gomes, Hayward, CA (US); and Aleksandar Nacev, San Francisco, CA (US)
Assigned to Promaxo, Inc., Oakland, CA (US)
Appl. No. 17/905,716
Filed by PROMAXO, INC., Oakland, CA (US)
PCT Filed Mar. 9, 2021, PCT No. PCT/US2021/021461
§ 371(c)(1), (2) Date Sep. 6, 2022,
PCT Pub. No. WO2021/183482, PCT Pub. Date Sep. 16, 2021.
Claims priority of provisional application 62/987,286, filed on Mar. 9, 2020.
Prior Publication US 2023/0296707 A1, Sep. 21, 2023
Int. Cl. G01R 33/36 (2006.01); A61B 5/055 (2006.01); G01R 33/38 (2006.01); G01R 33/44 (2006.01); G01R 33/483 (2006.01)
CPC G01R 33/3607 (2013.01) [A61B 5/055 (2013.01); G01R 33/445 (2013.01); G01R 33/3802 (2013.01); G01R 33/3808 (2013.01); G01R 33/483 (2013.01)] 23 Claims
OG exemplary drawing
 
1. A method for transmitting radio frequency pulses for a single-sided magnetic imaging apparatus, wherein an inherent gradient magnetic field extends from the magnetic imaging apparatus relative to a first axis into the field of view, and wherein the method comprises:
applying a first sweeping frequency pulse having a first duration and a first sweep rate, wherein the first sweeping frequency pulse defines an X axis, wherein the first sweeping frequency pulse comprises a first 90 degree pulse configured to rotate the magnetization to a transverse plane for the first duration;
applying a second sweeping frequency pulse having a second duration and a second sweep rate, wherein the second sweeping frequency pulse defines a first Y axis;
applying a third sweeping frequency pulse having a third duration and a third sweep rate, wherein the third sweeping frequency pulse defines a second Y axis; and
applying a fourth sweeping frequency pulse having a fourth duration and a fourth sweep rate, wherein the fourth sweeping frequency pulse defines a −X axis, wherein the fourth sweeping frequency pulse comprises a second 90 degree pulse configured to rotate the magnetization back to the first axis, and wherein the fourth sweep rate is less than the third sweep rate.