Patent ID: 6163153
Filing Date: 2000-12-19
Classification: G01N

Abstract:
A method for acquiring nuclear magnetic resonance measurements of a material, comprising:inducing a static magnetic field in said material;inducing a first radio frequency magnetic field in said material, said first radio frequency magnetic field having an amplitude and duration selected to reorient nuclear magnetic spins in said material by about 90 degrees from alignment with said static magnetic field;inducing a second radio frequency magnetic field in said material;detecting nuclear magnetic resonance signals from said material;repeating said steps of inducing said first and said second radio frequency magnetic fields and detecting said nuclear magnetic resonance signals; andstacking said detected nuclear magnetic resonance signals to form a stacked signal, wherein said second radio frequency magnetic field has a duration and amplitude selected to reorient said nuclear magnetic spins by a flip angle selected so that said stacked signal has increased signal to noise ratio compared to a single nuclear magnetic resonance signal generated wherein said flip angle is 180 degrees, while consuming substantially the same electrical power as used to generate said single nuclear magnetic resonance signal wherein said flip angle is 180 degrees.