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Method for positioning coordinates of magnetic resonance imaging based on direct linear transformation and singular value decomposition

A singular value decomposition and linear transformation technology, which is applied in medical science, sensors, diagnostic recording/measurement, etc., to achieve the effect of optimizing positioning methods, reducing positioning errors, and improving positioning accuracy

Active Publication Date: 2015-12-16
南通沈德医疗器械科技有限公司
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  • Claims
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Problems solved by technology

However, this method is still insufficient in solving the transformation relationship matrix

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  • Method for positioning coordinates of magnetic resonance imaging based on direct linear transformation and singular value decomposition
  • Method for positioning coordinates of magnetic resonance imaging based on direct linear transformation and singular value decomposition
  • Method for positioning coordinates of magnetic resonance imaging based on direct linear transformation and singular value decomposition

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Embodiment 1

[0036] This embodiment provides a magnetic resonance coordinate positioning method based on direct linear transformation and singular value decomposition, which is used for positioning the three-dimensional coordinates of an ultrasonic probe. The diameter of the ultrasonic probe is less than 40 cm. The plane or spherical surface of the transducer (piezoelectric ceramic sheet) (for the spherical surface, this method is aimed at the circular plane on the spherical surface). In this method, six positioning markers for positioning are distributed on the edge of the ultrasonic probe, and the upper and lower ends of each positioning marker are used as positioning points, and the conversion between the MRI coordinate system and the ultrasonic treatment system coordinate system is calculated according to the positions of each positioning point The relationship matrix realizes the three-dimensional coordinate positioning of the ultrasound probe.

[0037] Such as figure 1 As shown, the...

Embodiment 2

[0058] Such as figure 2 As shown, in this embodiment, the positioning marker is a positioning cylinder arranged on the edge of the ultrasonic probe and perpendicular to the surface of the ultrasonic probe. The positioning cylinder has a height of 20 mm and a diameter of 2 mm. All the other are with embodiment 1.

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Abstract

The invention relates to a method for positioning coordinates of magnetic resonance imaging based on direct linear transformation and singular value decomposition. According to the method, a computational process of a matrix of conversion relation between an MRI coordinate system and a coordinate system of an ultrasonic therapy system includes acquiring linear equations of positioning markers through transversal scanning by an ultrasonic probe, and removing the linear equation having the maximal error; acquiring planar equations of the upper and lower surface of the ultrasonic probe through lengthwise scanning by the ultrasonic probe; acquiring coordinates of 10 positioning points; computing a middle conversion matrix H of the MRI coordinate system and the coordinate system of an ultrasonic therapy system through direct linear transformation and singular value decomposition; orderly removing the ith point in the acquired 10 positioning points, and acquiring a corresponding middle conversion matrix Hi using the rest 9 positioning points; and removing two positioning points having the maximal errors, and computing a matrix T of conversion relation between the MRI coordinate system and the coordinate system of an ultrasonic therapy system. Compared with the prior art, the method is high in positioning precision.

Description

technical field [0001] The invention relates to an ultrasonic probe coordinate positioning method, in particular to a magnetic resonance coordinate positioning method based on direct linear transformation and singular value decomposition. Background technique [0002] Therapeutic ultrasound is to use the penetration of ultrasound to transmit ultrasound with a certain energy to human tissues. Under the action of various physical effects such as mechanical effects, thermal effects, and cavitation effects of ultrasound, it can perform tumor treatment, thrombolysis, and microbubble drug loading. Many doctors and scientific workers believe that the wide promotion and application of therapeutic ultrasound technology will vigorously promote the progress of non-invasive treatment technology, which is an important milestone in the process of human exploration of non-invasive treatment technology . However, the development of this technology once encountered a big bottleneck due to p...

Claims

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Application Information

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IPC IPC(8): A61B5/055A61B5/06
Inventor 刘文杰
Owner 南通沈德医疗器械科技有限公司
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