Method for reducing system temperature errors in real-time magnetic resonance temperature imaging

Abstract

The invention discloses a method for reducing system temperature errors in real-time magnetic resonance temperature imaging. A plurality of reference water films are placed around an imaging object; the plurality of reference water films are subjected to real-time temperature measurement through magnetic resonance compatibility optical fibers; the phase difference of each reference water film temperature measuring point and the practical temperature change of each reference water film temperature measuring point are calculated by collecting magnetic resonance phase diagrams before heating andduring heating, and the main magnetic field deviation of each reference water film temperature measuring point is calculated; the integral plane distribution of the main magnetic field deviation is estimated according to the real-time main magnetic field deviation of the reference water film temperature measuring point; and each pixel point of the magnetic resonance imaging is corrected accordingto the integral plane distribution of the main magnetic field deviation in accordance with the temperature directly calculated by using the phase diagram to obtain the practical temperature. The method provided by the invention has the advantages that the main magnetic field deviation value and the space distribution in the magnetic resonance temperature imaging process are accurately estimated, so that the temperature measuring error in the magnetic resonance temperature imaging is reduced.

Description

technical field [0001] The invention relates to the technical field of magnetic resonance temperature imaging, in particular to a method for reducing system temperature errors in real-time magnetic resonance temperature imaging. Background technique [0002] Real-time magnetic resonance temperature imaging can realize non-invasive, fast and accurate temperature measurement of human tissues. It is mainly used in real-time temperature detection of minimally invasive surgery such as thermal ablation of tumor tissue, to judge whether the temperature reaches the ideal value and the spatial distribution of temperature, so as to help distinguish microscopic invasive surgical effect and early warning of intraoperative risks such as excessive local temperature. [0003] Magnetic resonance temperature imaging based on proton resonance frequency shift (PRF, proton resonance frequency), because of better temporal and spatial resolution, higher sensitivity and accuracy under high field, ...

AI Technical Summary

Problems solved by technology

However, in real application scenarios, the above two assumptions are difficult to satisfy

For hypothesis one, it is difficult to determine the real temperature change in this area of ​​the tissue; for hypothesis two, continuous magnetic resonance scanning will change the main magnetic field changes in all imaging spaces, and due to the continuous work of the shimming gradient, the main magnetic field There is a certain spatial distribution difference in the change of

In view of the irrationality of these two assumptions, there are certain measurement errors in the current PRF-based magnetic resonance temperature imaging

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