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Magnetic resonance imaging method

A magnetic resonance imaging and magnetic resonance technology, applied in magnetic resonance measurement, material analysis through resonance, measurement of magnetic variables, etc., can solve problems such as optimal utilization of parameters that hinder measurement, large allowable errors, and patient insecurity.

Inactive Publication Date: 2003-04-23
SIEMENS AG
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  • Application Information

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Problems solved by technology

[0008] Due to the unsafety for the patient based on the planned measurement parameters in the determination of the SAR value, until now large tolerances had to be calculated, which prevented optimal use of the parameters allowed for the measurement

Method used

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Embodiment Construction

[0021] Figures 1a-1c show schematic cross-sectional views of a magnetic resonance tomography apparatus. Only the main components of the device are shown in the figure, namely the basic field magnet 1, the gradient coil system 2, the high-frequency transmitting antenna 3 and the receiving coil 4 (only Rx). Furthermore, the patient 5 can be seen lying on a patient couch 6 which can be moved in the magnetic resonance tomograph in the direction indicated by the arrow. During the measurement, radio-frequency pulses are injected into the body of the patient 5 via the radio-frequency transmitting antenna 3 designed as a solid coil in order to generate magnetic resonance signals. In this example, the magnetic resonance signal is detected by the receiving coil 4 or by the high-frequency antenna 3 that can also work as a receiver, and is respectively represented by the detected measurement area (indicated by a dotted circle in the figure and represented by a reference number 7) region)...

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Abstract

In a method for magnetic resonance imaging with adherence to SAR limit values, a patient (5) is charged with a radio-frequency pulse sequence via at least one transmission antenna (3) for the implementation of a measurement (15) in a magnetic resonance tomography apparatus, and the magnetic resonance signals that are produced are acquired in a spatially resolved manner via at least one reception antenna (3, 4) and are further-processed for producing magnetic resonance images and / or spectra. SAR values are determined before the implementation of the measurement (15) on the basis of patient data and the position of the patient (5) relative to the transmission antenna (3) for planned parameters of the measurement, and the parameters are modified as needed until the SAR values lie within the SAR limit values. The position of the patient (5) relative to the transmission antenna (3) is exactly determined by an imaging magnetic resonance pre-measurement (10, 16). The method enables adherence to the SAR limit values without having to take large tolerances into consideration. No additional hardware whatsoever and no positioning rule for the user are required for the realization of the method.

Description

technical field [0001] The invention relates to a magnetic resonance imaging method while maintaining SAR limit values. In this case, a radio-frequency pulse sequence is transmitted to a patient to be measured in magnetic resonance tomography by means of at least one transmitting antenna, and the resulting magnetic resonance signals are recorded locally resolvably (ortsaufgeloest) by at least one receiving antenna in order to provide Production of magnetic resonance images and / or magnetic resonance spectra continues with processing wherein, prior to taking the measurements, SAR values ​​are calculated for the parameters of the planned measurements from patient data and the position of the patient relative to the transmitting antenna, and these parameters are changed if necessary , until the SAR value is within the SAR boundary value. Background technique [0002] Magnetic resonance tomography is a well-known technique for acquiring images inside the subject's body. In orde...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/055G01R33/58
CPCG01R33/583A61B5/0555A61B5/055
Inventor 格哈德·布林克尔沃尔夫冈·伦兹
Owner SIEMENS AG