US 12,078,700 B2
Spin resonance signal measurement using a modulated fictitious field
Xueyan Tang, Minneapolis, MN (US); Michael Garwood, Minneapolis, MN (US); and Steven Suddarth, Minneapolis, MN (US)
Assigned to REGENTS OF THE UNIVERSITY OF MINNESOTA, Minneapolis, MN (US)
Filed by Regents of the University of Minnesota, Minneapolis, MN (US)
Filed on Mar. 8, 2022, as Appl. No. 17/689,794.
Claims priority of provisional application 63/158,183, filed on Mar. 8, 2021.
Prior Publication US 2022/0397621 A1, Dec. 15, 2022
Int. Cl. G01R 33/46 (2006.01); G01R 33/34 (2006.01); G01R 33/385 (2006.01); G01R 33/60 (2006.01)
CPC G01R 33/46 (2013.01) [G01R 33/34092 (2013.01); G01R 33/385 (2013.01); G01R 33/60 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method for measuring spin resonance signals generated by a spin isochromat, the method comprising:
(a) generating a fictitious polarizing field along an axis by transmitting a radio frequency (RF) field in a plane with an RF transmit coil, the fictitious polarizing field having a field strength determined by a carrier frequency and amplitude of the RF field, a relaxation time of the spin isochromat, and a gyromagnetic ratio of the spin isochromat, wherein generating the fictitious polarizing field polarizes the spin isochromat along a direction perpendicular to the plane in which the RF field is transmitted;
(b) acquiring spin resonance signal data with an RF receive coil by modulating the fictitious field using the RF transmit coil while measuring spin resonance signal generated from a change of longitudinal magnetization of the spin isochromat along the direction perpendicular to the transverse plane.