Radio frequency coil for guiding ultrasonic focusing system and design method thereof

Abstract

The invention provides a radio frequency coil for guiding an ultrasonic focusing system and a design method thereof, and belongs to the technical field of magnetic resonance imaging. A coil support housing used by the radio frequency coil is of a cylindrical surface; furthermore, the cylindrical surface is radially provided with an arc-surface gap alpha; a coil loop is arranged on the support housing and comprises two groups of 8-shaped loops and a group of annular compensation loop; the two groups of the 8-shaped loops are arranged in parallel along the axial direction of a cylinder, and two rings in the same 8-shaped loop are arranged along the circumferential direction of the cylinder; the annular compensation loop is arranged in the middle of the two groups of the 8-shaped loops; insulating pads are arranged at the intersected parts of the 8-shaped loops; the two groups of the 8-shaped loops are connected in parallel to form a channel; and the annular compensation coil constitutes the channel alone and is connected with an output circuit board for sending out signals. The radio frequency coil device can enable a low-field magnetic resonance device to be matched with the ultrasonic focusing system for use, provide a sufficient surgical operation space for a doctor and realize real-time non-invasive monitoring of temperature of tissues of a human body during a thermal ablation operation.

Description

technical field [0001] The invention relates to a magnetic resonance imaging technology, in particular to a radio frequency coil structure for accurate measurement of thermal ablation parameters in ultrasonic focused thermal ablation. Background technique [0002] Focused ultrasonic ablation (FUS) has attracted much attention in clinical treatment, especially in tumor treatment, because of its good orientation, non-invasiveness and safety. Its mechanism is to use the tissue penetrating and focusable characteristics of ultrasound to accurately focus the countless beams of low-energy ultrasound emitted by the ultrasound transducer on the target tissue in the body, and to cause coagulation necrosis of the tissue in the focused area instantaneously through the thermal effect of ultrasound on the tissue. Therefore, the therapeutic effect of thermal ablation surgery is closely related to the temperature of the target tissue. During the treatment process, it is necessary to monitor...

AI Technical Summary

Problems solved by technology

Due to the high complexity of the numerical calculation of the inverse method itself, in the previous inverse method design of RF coils, the coil support shell was usually assumed to be cylindrical or conical to facilitate modeling and reduce computational complexity. However, Such an ordinary cylindrical or conical support shell will cause the calculated current density to be distributed on the entire surface of the shell, which cannot provide a treatment space for ultrasonic energy-concentrating equipment

In addition, after the discretization or simplification of the coil circuit arrangement obtained by the flow function, the magnetic field generated by the loop arrangement can only approximate the target field, so it is necessary to optimize or compensate the discretized coil, however , optimization or compensation techniques have not been reported in previous inverse methods

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