Magnetic resonance imaging system protecting method and device, and automatic shutoff testing method

Abstract

Disclosed are a magnetic resonance imaging system protecting method and device, and an automatic shutoff testing method. The protecting method includes a), providing expected safety parameters; b), after the magnetic resonance imaging system starts scanning corresponding to initial sequence information, collecting actual sequence information in the process of scanning; c), according to the actual sequence information, calculating actual safety parameters; d), judging whether the actual safety parameters do not exceed the expected safety parameters or not; e), if yes, continuing to execute scanning corresponding to an initial sequence; f), if not, stopping scanning. The device comprises an input module used for inputting the expected safety parameters, a collection module used for collecting the actual sequence information, a calculation module used for calculating the actual safety parameters according to the actual sequence information, a judgment module used for judging whether all of the actual safety parameters do not exceed the expected safety parameters or not, and the control module is used for controlling to continue to execute scanning if yes and to stop scanning if not. By the protecting method and the protecting device, safety of a scanning object in the actual process of scanning can be effectively guaranteed.

Description

technical field [0001] The invention relates to the field of magnetic resonance technology, in particular to a protection method, device and self-shutoff test method of a magnetic resonance imaging system. Background technique [0002] Magnetic Resonance Imaging (MRI, Magnetic Resonance Imaging) is an important application field of nuclear magnetic resonance, and now MRI has become one of the main tools for medical clinical diagnosis and basic scientific research. The basic principle is to place the human body in a special magnetic field, and use radio frequency pulses to excite the hydrogen nuclei in the human body, causing the hydrogen nuclei to resonate and absorb energy. After the radio frequency pulse is stopped, the hydrogen nucleus emits a radio signal at a specific frequency, and releases the absorbed energy, which is collected by an external receiver and processed by an electronic computer to obtain an image. With the progress of superconducting technology, electro...

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Problems solved by technology

[0012] However, the above technology only guarantees the security of the scanned object through theoretical calculations before starting the scan, and due to possible differences between the theoretical value and the actual value, after the sequence information is actually executed, the actual SAR or actual DB / DT will exceed the corresponding value range, and will eventually cause damage to the scanned object

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