1)He keeps stating that there are 6/10000 more parallel to antiparallel proton spin, it is 6/1000000. 2)Why not use superconducting receiver coils? Is due to safety, or price?
@practiCalfMRI6 жыл бұрын
Re 2, for human imaging, the noise from the body is far greater than the noise in the receive coil, so there's no real benefit. In high resolution NMR of small samples, however, the noise in the detector coil & preamplifier chain dominate sample noise, so there is a big benefit to using a supercon. receive coil. But. (There's always a "but.") Even then, one must determine the practical consequences of having a high quality factor coil. There are reciprocal effects of coupling a large signal to a high sensitivity coil; phenomena such as "radiation damping." It means that supercon. coils are only really beneficial under certain situations, they aren't universally better than room temp copper coils.
@aime-noelrain-do7yv Жыл бұрын
at 2:34 did you mean to say the electrical current is going into the bore rather than the magnetic field ? I thought B1 had to be perpendicular to B0! .... can someone help ?
@greatestever89764 жыл бұрын
Are you saying our beds can be weaponized? How will these coils interact with 5G?