Method and system for determining orientation and x-coordinate of a movable object relative to a bo field magnet

By setting a three-dimensional magnetic field strength sensor and an acceleration sensor on the local coil, and combining the B0 field magnet reference data and rotation matrix correction, the problem of orientation error of the local coil outside the patient channel was solved, and high-precision X-coordinate determination was achieved.

CN120820896BActive Publication Date: 2026-06-05SIEMENS HEALTHINEERS AG
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SIEMENS HEALTHINEERS AG
Filing Date
2025-04-11
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

In the prior art, when the local coil is set outside the patient channel and offset from the Z-axis, it is impossible to determine its orientation and X-coordinate in the XZ-coordinate plane with high precision.

Method used

By setting a three-dimensional magnetic field strength sensor on a local coil and using reference data from the B0 field magnet, magnetic field strength is measured at two locations. The orientation is corrected by combining an accelerometer with a rotation matrix to level the measured values ​​onto the XZ coordinate plane and correct the angle values ​​to determine the accurate X coordinate.

Benefits of technology

It achieves high-precision determination of the orientation and X coordinate of a local coil in the XZ coordinate plane when the coil deviates from the Z coordinate axis, thus reducing system errors.

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Abstract

The invention relates to a method for determining an orientation of an object in an X-Z coordinate plane relative to a B0 field magnet of a magnetic resonance tomograph by means of a three-dimensional magnetic field strength sensor arranged in fixed relative position at the movable object, comprising at least the following steps: providing B0 reference data; positioning the object with respect to the Z coordinate axis at a first position outside the B0 field magnet; providing a first measurement value of the magnetic field strength sensor at the first position; deriving a first angle value by means of the first measurement value of the magnetic field strength sensor at the first position and the B0 reference data; positioning the object with respect to the Z coordinate axis at a second position inside the B0 field magnet; providing a second measurement value of the magnetic field strength sensor at the second position; deriving a second angle value by means of the second measurement value of the magnetic field strength sensor at the second position and the B0 reference data; correcting the first angle value by means of the second angle value and providing a corrected first angle value.
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