SAR value determination method of magnetic resonance imaging and magnetic resonance imaging device

Abstract

The invention discloses an SAR value determination method of magnetic resonance imaging. The method comprises the steps that patients are placed in a scanning table of a magnetic resonance imaging system, the scanning table is moved, so that the patients are moved toward a scanning area, the quality of body parts, located on the scanning area, of the patients, is obtained, and an SAR value of parts of bodies is determined according to the quality of the body parts which are located on the scanning area; the process of obtaining the quality of the body parts which are located on the scanning area comprises the steps that a frequency domain characteristic curve of a body part outline on the selected level position is obtained, the parts to be imaged which is located on the scanning area are identified according to the distribution of a signal area of the characteristic curve, and the position of the parts to be imaged is determined according to the position of the scanning table; according to the weight and the height of the patients, and the position of the parts to be imaged, the quality of body parts which enter the scanning area is obtained. According to the SAR value determination method, a precise human body exposure estimation model can be built, and the scanning speed and the imaging quality are improved. Furthermore, the invention further provides a magnetic resonance imaging device.

Description

【Technical field】 [0001] The invention relates to the technical field of magnetic resonance imaging, in particular to a related technology capable of accurately monitoring the local specific absorption rate in the scanning area of ​​the magnetic resonance imaging. 【Background technique】 [0002] Magnetic resonance imaging (MRI, magnetic resonance imaging) is a high-tech imaging based on the performance characteristics of biological hydrogen nuclei in a magnetic field. The physical basis of magnetic resonance imaging is the resonance phenomenon related to material magnetism and magnetic field, that is, radio frequency waves The angular momentum has the magnetic moment and the resonant properties exhibited by the system interacting in an external magnetic field. The clinical application in the central nervous system has become the gold standard for disease diagnosis, and it is also unique in the diagnosis of bone, joint and soft tissue lesions. In recent years, ultra-high-fie...

AI Technical Summary

Problems solved by technology

However, in some special scans such as knee joint scans or infant scans, the position on the scanning table is not fixed, and the position of the human body in the scanning area relative to the radio frequency transmitting coil can no longer be obtained by fixing the position of the coil, and thus cannot be accurately scanned. Get SAR value

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