Apparatus for correcting position of therapeutic instrument guided by magnetic resonance

Abstract

The invention discloses a method for correcting position for therapeutic equipment guided by an MR and a treatment to a therapeutic target by the therapeutic equipment comprises the processes: according to the picture position of the therapeutic target, the spatial location of the therapeutic equipment is determined; a gradient distortion correction offset corresponding to the therapeutic target is calculated; on the basis of the gradient distortion correction offset, the spatial location of the therapeutic equipment is corrected. The invention also discloses a position correction device for the therapeutic equipment guided by the MR, which comprises a position determination unit that is used for determining the spatial location of the therapeutic equipment according to the picture position of the therapeutic target, a gradient distortion correction unit which is used for calculating the gradient distortion correction offset corresponding to the therapeutic target and for correcting the spatial location of the therapeutic equipment based on the gradient distortion correction offset. When the method and the device are used, the position deviation of the therapeutic equipment guided by the MR is corrected while the position deviation is caused by the nonlinearity of gradient magnetic field, thus ensuring the accuracy and precision of therapy guided by the MR.

Description

technical field [0001] The present invention relates to magnetic resonance imaging (MRI, Magnetic Resonance Imaging) technology, in particular to a method and device for correcting the position of a magnetic resonance guided treatment instrument. Background technique [0002] The main magnet of the MRI imaging system is used to generate a highly uniform and stable static magnetic field B 0 , so that the hydrogen nuclei in the human body in the magnetic field are magnetized to form a magnetization vector. When the magnetization vector is subjected to the action of the radio frequency alternating magnetic field satisfying the resonance condition, a resonance signal is generated. [0003] Figure 1a is a schematic diagram of the static magnetic field generated by the main magnet in the MRI system. If there is only a uniform static magnetic field B 0 In the magnetic field, the magnetization intensity of all parts of the human body precesses around the direction of the static ...

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Problems solved by technology

During MR-guided HIFU treatment, such as the use of HIFU transducers to treat tumors, due to the distortion caused by the nonlinearity of the magnetic field gradient, the MR image will not correctly reflect the relative position of the transducer and the tumor , the result of this is that the ultrasonic beam emitted by the transducer cannot hit the intended treatment area, so that the treatment effect is not good, and even the treatment fails

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