Bimodal magnetic resonance temperature measurement method based on multi-gradient echo sequence

Abstract

The invention discloses a bimodal magnetic resonance temperature measurement method based on a multi-gradient echo sequence. The method comprises the following steps: acquiring magnetic resonance signals before and during heating through the multi-gradient echo magnetic resonance sequence, and meanwhile, reserving a phase diagram and an amplitude diagram of each echo; according to the phase diagrams of different echoes before and during heating, calculating temperature changes of each pixel point on the phase diagrams before and after heating, and according to the amplitude diagrams of different echoes during heating, calculating signal intensity of each pixel point when TE is 0; according to the signal intensity of the amplitude diagrams before heating and the signal intensity of each pixel point when TE is 0, calculating temperature change delta T(M) of each pixel point based on an amplitude value; and according to the sum delta T(M), judging final actual temperature T of each pixelpoint or giving out an error warning. According to the temperature measurement method, by synchronous use of the amplitude diagrams and the phase diagrams in multi-gradient echo magnetic resonance temperature imaging, bimodal temperature imaging is realized, and accuracy of magnetic resonance temperature imaging is further improved.

Description

technical field [0001] The invention relates to magnetic resonance imaging technology, in particular to a dual-mode magnetic resonance temperature measurement method based on multiple gradient echo sequences. 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] Gradient echo magnetic resonance sequence (GRE, or other deformation sequence) is the mainstream technology of magnetic resonance temperature imaging method, which is mainly used for magnetic resonance temperature imaging based on proton...

AI Technical Summary

Problems solved by technology

The main disadvantage of MRI temperature imaging based on the phase method is that the phase difference map is also affected by non-temperature factors, such as the offset of the main magnetic field, and there is a certain risk of measurement deviation.

At the same time, the multi-gradient echo magnetic resonance sequence can obtain the phase map and the amplitude map at the same time, while the traditional magnetic resonance temperature imaging often abandons the amplitude map and only uses the phase map without fully utilizing the temperature information in the magnitude map

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