Calibration measurement method, device, computer equipment and non-uniform field magnetic resonance system for transverse magnetization vector decay time constant

Abstract

The invention relates to the technical field of nuclear magnetic resonance imaging, and discloses a method for correcting and measuring the decay time constant of a transverse magnetization vector, a device, a computer device and an inhomogeneous field magnetic resonance system. In the NMR system of the echo time, the ADC-T2 two-dimensional spectrum is first fitted by acquiring multiple echo signals collected by SE-CPMG sequences with different b values, and then the transverse magnetization vector decay time constant T2 Make corrections, so that the problem of small T2 measurement values ​​caused by diffusion can be avoided. In addition, a more accurate ADC-T2 two-dimensional map can be further obtained based on the corrected T2 measurement value, ensuring that the T2 value measurement is not affected by echo time and molecular diffusion, and has low system requirements, which can reduce system costs.

Description

technical field [0001] The invention belongs to the technical field of nuclear magnetic resonance imaging, and in particular relates to magnetic resonance spectrometer technology, in particular to a method, device, computer equipment and non-uniform field magnetic resonance system for correcting and measuring the decay time constant of a transverse magnetization vector. Background technique [0002] Nuclear magnetic resonance technology is a technique that uses the nuclear magnetic resonance phenomenon of hydrogen protons to image or detect the composition and structure of substances. Nuclei containing a single number of protons in the human body, such as the hydrogen nucleus, have a spin motion for the protons. The spin motion of charged atomic nuclei is physically similar to individual small magnets, and the directionality distribution of these small magnets is random in the absence of external conditions. When the human body is placed in an external magnetic field, these...

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Problems solved by technology

[0007] In order to solve the problem that in NMR systems with extremely inhomogeneous magnetic fields or where extremely short echo times cannot be achieved, the measured transverse magnetization vector decay time constant T2 is too small, resulting in the inability to accurately measure the two-dimensional spectrum of T2 and ADC coefficients The problem of distribution, the object of the present invention is to provide a kind of correction measurement method, device, computer equipment, inhomogeneous field magnetic resonance system and computer-readable storage medium of transverse magnetization vector decay time constant

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