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Magnetic resonant imaging method and equipment accumulating power

A technique of magnetic resonance imaging, magnetic resonance, applied in the field of continuing to produce magnetic resonance images or magnetic resonance spectra, and can solve problems such as absorption reduction

Inactive Publication Date: 2003-05-14
SIEMENS HEALTHCARE GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this conservative prediction itself leads, for example, to a reduction of the actually permissible energy absorption in a very short measurement of the patient by the ratio "recorded operating time / prescribed mean time"

Method used

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  • Magnetic resonant imaging method and equipment accumulating power
  • Magnetic resonant imaging method and equipment accumulating power
  • Magnetic resonant imaging method and equipment accumulating power

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Embodiment Construction

[0020] figure 1 The high-frequency power absorbed by the patient over time is shown in two mutually independent measurements. It was 10 in the past and 11 in the future. Here, the vertical line is the current moment for which the current SAR value of the planned measurement should be determined. The planned measured power changes 12 are recorded in the future 11 . Below the time axis of the figure are shown the different time intervals over which the high-frequency power is averaged when calculating the current SAR value. In order to ensure that the SAR limit value is not exceeded at all times of the planned measurement, the time window indicated by the arrows 13 , 14 has to be shifted approximately from the past before the start of the measurement to the end of the future planned measurement. This movement must take place with a time step small enough that possible SAR boundary violations can be detected in the measurement. The time intervals (dotted arrows) or time windo...

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Abstract

The present invention relates to a magnetic resonant imaging method. When using a magnetic resonant tomography photography instrument, a transmit antenna radiates high frequency pulse to patient, the generated magnetic resonant signal is decomposed and received by a receiving antenna, and is processed in order to generate magnetic resonant image and / or magnetic resonant spectrum. Before the measurement, a current specific absorption rate (SAR) value is calculated for the measurement using the stored data and planned parameters are modified to bring the current SAR value within a preset SAR limit. Before determining the current SAR value, a stored data is reckoned in, which includes the changing process of the bearing high frequency load varies with time in the executed measurement for the patient and the information for ensuring the time interval between the executed measurement for high frequency load and planned measurement. The method can use the performance of the magnetic resonant tomography photography instrument better, especially interested in economic, can improve the amount of the patient to be check under the circumstance of abiding SAR-limit value.

Description

technical field [0001] The invention relates to a magnetic resonance imaging method while observing SAR limit values. Among them, for the patient to be measured and examined in magnetic resonance tomography, at least one transmitting antenna transmits a high-frequency pulse sequence, and the generated magnetic resonance signal is decomposed on the spot and measured by at least one receiving antenna, so as to generate magnetic resonance signals. Resonance images or magnetic resonance spectra are processed further, wherein, prior to the measurement, current SAR values ​​are determined for the planned measurement parameters and are modified, if necessary, until the current SAR values ​​lie within the SAR limit values. The invention also relates to a magnetic resonance device for carrying out the method. Background technique [0002] Magnetic resonance tomography is a well-known technique for acquiring images inside the subject's body. In order to perform magnetic resonance to...

Claims

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Application Information

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IPC IPC(8): G01R33/58
CPCG01R33/583
Inventor 格哈德·布林克理查德·凯尔纳克劳斯·路德维格
Owner SIEMENS HEALTHCARE GMBH