High-field magnetic resonance scanning safety testing body model system, high-field magnetic resonance scanning safety testing method and magnetic resonance system

Abstract

The invention discloses a high-field magnetic resonance scanning safety testing body model system, a high-field magnetic resonance scanning safety testing body model method and a magnetic resonance system with the high-field magnetic resonance scanning safety testing body model system. The high-field-magnetic resonance scanning safety testing body model system comprises a radio frequency electric field measuring module, a bionic object body model and a computation processing module, the bionic object body model is positioned in a working area of the magnetic resonance system, the radio frequency electric field measuring module detects a radio frequency electric field of a target portion of the bionic object body model and obtains an equivalent value of the radio frequency electric field of the target portion, and the processing module computes to obtain a magnetic resonance scanning radio frequency Local SAR (specific absorption rate) value of the target portion according to the obtained equivalent value of the radio frequency electric field measuring module and a dielectric parameter of the target portion of a bionic object body model system. By means of comparing a Local SAR1 value obtained by the high-field magnetic resonance scanning safety testing body model system with a Local SAR2 value automatically obtained by the magnetic resonance system via bionic object body model scanning, the Local SAR2 value given by the magnetic resonance system is verified, and accordingly the safety of magnetic resonance scanning is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of high-field and ultra-high-field magnetic resonance human body scanning safety technology, and specifically relates to a high-field magnetic resonance scanning safety testing phantom system and a testing method thereof, and a high-field magnetic resonance scanning safety testing phantom system with the high-field magnetic resonance scanning safety testing phantom system magnetic resonance system. Background technique [0002] Magnetic resonance imaging (MRI) has the outstanding advantages of high soft tissue resolution, functional imaging, and no ionizing radiation to the human body, and is widely used in clinical practice. Key indicators of MRI imaging quality, such as spatial resolution, temporal resolution, and signal-to-noise ratio, will vary with the main magnetic field (B 0 Field) field strength has been greatly improved. Therefore, high field strength MRI is an inevitable development trend. with ...

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Problems solved by technology

[0009]The biggest defect of the Local SAR value simulation calculation method based on the human body electromagnetic model is: because a personalized whole-body electromagnetic model is established for each individual patient to calculate the Local SAR value, The workload is too large and unrealistic, so the general electromagnetic model of the human body can only be used, resulting in a large deviation between the calculated results of the Local SAR value and the real value in the case of large individual differences

Katscher et al. proposed a method using B1 Mapping technology to determine tissue complex conductivity and Local SAR value, but this method was only verified on a uniform phantom

Voigt et al. proposed a linear measurement method for complex dielectric parameters of brain tissue in 2011, and based on this research, proposed a calculation method for Local SAR values ​​based on complex dielectric parameters for living tissues in 2012, but only in the brain It has been verified in the living MR scan of the body, but it cannot be applied to the whole body, and the error of the calculation result is about 20%, the accuracy is not ideal, and needs to be improved

[0011] So far, although researchers have given some measurement and calculation methods of Local SAR values, the non-invasive quantitative determination of Local SAR values ​​of personalized whole body tissue under high-field MR scanning It has always been an unresolved problem

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