2 results about "Field homogeneity" patented technology

The application discloses a traveling wave antenna unit, an array and a method for improving high-field magnetic resonance radio frequency field uniformity, relates to the field of magnetic resonance imaging, and aims to improve high-field magnetic resonance radio frequency field uniformity. The application increases the component of the wave number of the traveling wave antenna unit in the traveling wave transmission line direction in the traveling wave antenna array through physical or chemical means to relieve the radial standing wave effect. The traveling wave antenna unit comprises a layer-by-layer designed metal microstrip, a first bearing substrate, a filling layer substrate, a slotted metal floor, a second bearing substrate and a spacing layer substrate. A feeding port is connected between the first end of the metal microstrip and the slotted metal floor, and a load is connected between the second end of the metal microstrip and the slotted metal floor. The filling layer substrate is a fillable structure. The component in the traveling wave transmission line direction is increased by increasing the relative dielectric constant of the filling medium or changing the slotted structure. The application is simple in design, convenient in operation and does not need additional hardware.

The invention discloses a magnetic resonance radio frequency shimming optimization method and device based on spatial weight and adaptive reweighting. The magnetic resonance radio frequency shimming optimization method based on spatial weight and adaptive reweighting comprises the following steps: acquiring excitation field distribution to be optimized; obtaining a target area excitation magnetic field matrix, a peripheral area excitation magnetic field matrix and a target function according to the to-be-optimized excitation field distribution; according to the target area excitation magnetic field matrix, the peripheral area excitation magnetic field matrix and a target function, through an iteration adaptive reweighting mechanism, dynamically updating a peripheral weight so as to generate a final channel complex weight; and transmitting the final channel complex number weight to a magnetic resonance emission system, thereby enabling the magnetic resonance emission system to realize radio frequency shimming according to the final channel complex number weight. Through the generated final channel complex weight, the peripheral response can be balanced while the performance of the target region is ensured, and the uniformity control of the B1 + field of each region is realized.