Special absorptivity calculating method, device and system and readable storage medium

Abstract

The invention discloses a special absorptivity calculating method, device and system and a readable storage medium. The method includes the steps of obtaining a target sequence corresponding to a detection item; calculating the corresponding radio frequency power according to the target sequence; obtaining the weight parameter of a to-be-scanned object, and obtaining the SAR value corresponding toa to-be-scanned part according to the first calculation expression, radio frequency power and weight parameter, wherein the first calculation expression is SAR=Pt / kW, Pt represents the radio frequency power, W represents the weight parameter of the to-be-scanned object, and k represents the weight coefficient of the to-be-scanned part of the to-be-scanned object. Through the first calculation expression, the SAR value of the to-be-scanned part of the to-be-scanned object can be calculated; compared with a calculating method in the prior art, the SAR value corresponding to the to-be-scanned part calculated through the method is more accurate, the radio frequency bandwidth can be easily expanded, the applicability of a higher-grade sequence is improved, the resolution ratio of an image canbe increased to a certain extent, and the layer thickness is reduced.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of nuclear magnetic resonance imaging, and in particular, relate to a calculation method, device, system, and computer-readable storage medium of a special absorption rate. Background technique [0002] Radio frequency (RF) pulse transmission is widely used in medical magnetic resonance imaging (MRI) systems and is an essential part of MRI systems. In recent years, with the application of some high-speed imaging sequences, such as MSE, EPI, etc., the transmission power of RF pulses has become larger and larger, which has caused some safety problems. For example, the deposition of RF power in the human body may cause local temperature rise and damage human tissues and organs. For this reason, the US Food and Drug Administration (FDA) proposed to limit excessive power deposition based on the specific absorption rate (SAR) of the human body, and the unit of SAR is watts per kilogram of bo...

AI Technical Summary

Problems solved by technology

Since the MRI systems in the prior art are all of the whole body type, the corresponding SAR value calculation methods are all calculated based on the power deposition of the whole body. The SAR value is based on the power deposition of the whole body as the judgment standard. However, because the upper limit of the SAR value of each part of the human body is different, the SRA value obtained by using the power deposition technology based on the whole body is not accurate, resulting in the inability of various sequences to be used on 3T magnetic resonance. Use, other sequences that require a lot of refocusing pulses, such as FSE, MSE and IR, are also limited, and the limitation of radio frequency bandwidth also affects the resolution and layer thickness of scanning images

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