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

An echo sequence and magnetic resonance technology, which is applied in the directions of diagnostic recording/measurement, medical science, sensors, etc., can solve the problem of not fully utilizing the temperature information of the amplitude map, and achieve the effect of improving the accuracy

Active Publication Date: 2020-09-29
HANGZHOU GENLIGHT MEDTECH CO LTD
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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-gradien...

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

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Embodiment Construction

[0031] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments (such as head imaging).

[0032] 1. If figure 1 As shown, the positioning image and necessary structural images are scanned first.

[0033] 2. If figure 1 As shown, before heating, 5–10 frames of multi-gradient echo magnetic resonance sequences are scanned in advance, and the number of echoes is N, and N needs to be greater than or equal to 2.

[0034] 3. If figure 1 As shown in , the phase map and amplitude map of each echo obtained by the multi-gradient echo magnetic resonance sequence scanning before heating were averaged, and used as the phase map and amplitude map of each echo before heating.

[0035] 4. If figure 1 As shown, turn on the heating device and start collecting the heating multiple gradient echo MRI sequence.

[0036] 5. If figure 1 Shown, phase and magnitude maps of a multiple gradient echo MR scan in real-time transmission ...

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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...

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Application Information

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IPC IPC(8): A61B5/01A61B5/055
CPCA61B5/01A61B5/055A61B5/0033
Inventor 曹鹏
Owner HANGZHOU GENLIGHT MEDTECH CO LTD
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