Small Animal RF Coils for Clinical Ultra-High Field Magnetic Resonance Imaging Systems

Abstract

A small animal radio-frequency coil used in a clinical ultra-high field magnetic resonance imaging system, consisting of a single-channel transmitting and receiving integrated antenna (1) and multiple receiving antennas (2). The multiple receiving antennas (2) form multiple channels. All the receiving antennas (2) are arranged in a circular array on the outer periphery of the transmitting and receiving integrated antenna (1) and geometrically overlap with the transmitting and receiving integrated antenna (1), and the radio-frequency decoupling between the antenna channels is enhanced by generated mutual inductance. The coverage area of the transmitting and receiving integrated antenna (1) is less than the sum of the coverage areas of all the receiving antennas (2), thereby achieving signal excitation in a small imaging area. The receiving antennas (2) have a parallel imaging function of a clinical magnetic resonance imaging system, thereby helping to shorten the scanning time and improve the image quality. The transmitting and receiving integrated antenna (1) and the receiving antennas (2) are each connected in series with a capacitor and connected to its respective preamplifier (3). The requirements for flexible coil placement for imaging of small animals of different sizes can be satisfied.

Description

technical field [0001] The invention relates to the field of ultra-high-field magnetic resonance imaging systems, and specifically designs a small animal radio frequency coil for clinical ultra-high-field magnetic resonance imaging systems. Background technique [0002] The basic principle of magnetic resonance imaging comes from the discovery of American scholars Bloch and Purcell in 1946. Under the action of an external magnetic field, some protons (including hydrogen protons in the human body) that spin around the main magnetic field (external magnetic field) precess in a short time Under the action of the radio frequency wave, the precession angle increases; when the radio frequency wave stops, the protons will gradually return to their original state, and at the same time release the radio frequency signal with the same frequency as the excitation wave. This physical phenomenon is called nuclear magnetic resonance . Magnetic resonance imaging technology uses this princ...

AI Technical Summary

Problems solved by technology

[0006] The technical problems to be solved by the present invention include: customizing the design of a transmitting antenna with high emission efficiency and uniformity; improving the slow imaging speed and resolution caused by the insufficient performance of the gradient system when the clinical magnetic resonance system is used for small animal imaging through special design Issues with low and poor image quality; compatible with diverse animal bodies and loading multimodal imaging setups

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