WO2025202949 - METHOD FOR CORRECTING LOCALIZATION ERROR CAUSED BY FIELD INHOMOGENEITY IN MRI WIRELESS MARKER TRACKING
National phase entry is expected:
Publication Number
WO/2025/202949
Publication Date
02.10.2025
International Application No.
PCT/IB2025/053225
International Filing Date
27.03.2025
Title **
[English]
METHOD FOR CORRECTING LOCALIZATION ERROR CAUSED BY FIELD INHOMOGENEITY IN MRI WIRELESS MARKER TRACKING
[French]
PROCÉDÉ DE CORRECTION D'ERREUR DE LOCALISATION PROVOQUÉE PAR UNE INHOMOGÉNÉITÉ DE CHAMP DANS UN SUIVI DE MARQUEUR SANS FIL IRM
Applicants **
MULTI-SCALE MEDICAL ROBOTICS CENTER LIMITED
Inventors
CHANG, Hing Chiu
LIANG, Liyuan
Priority Data
63/570,835
28.03.2024
US
Application details
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International Searching Authority |
CNIPA
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| Recordal of a Change of the Applicant's Name/Address |
Change of Applicant's Name and Address
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| Type of Assignment |
The Standard Agent's Assignment
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| Applicant's Legal Status |
Legal Entity
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| Entry into National Phase under |
Chapter I
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| Patent Delivery |
Send the Letters Patent by Courier
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| 译文 |
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Quotation for National Phase entry
| Country | Stages | Total | |
|---|---|---|---|
| China | Filing, Examination, Granting | 1692 | |
| EPO | Filing, Examination, Granting | 11576 | |
| Japan | Filing, Examination, Granting | 2124 | |
| South Korea | Filing, Examination, Granting | 2071 | |
| USA | Filing, Examination, Granting | 4740 |
Total:
22,203
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Abstract[English]
This invention provides a method for correcting the localization errors caused by field inhomogeneity and obtaining position information of a wireless marker in an MRI scanner. In one embodiment, said method comprises the steps of: a) Providing said wireless marker in said workspace; b) Performing a pulse sequence with said MRI scanner, comprising: i) Exciting all spins inside said workspace; ii) Applying a pre-phasing gradient along a frequency encoding; iii) Applying dephasing gradients in two directions orthogonal to said frequency encoding direction; and iv) Applying two readout gradients with same amplitude and opposite polarities along said frequency encoding direction to form a first and a second gradient echo; c) Acquiring a first and a second MR signal using an array of RF receiver coils by sampling said first and second gradient echoes respectively; and d) Reconstructing tracking signals from said first and second MR signals and calculating said position information.[French]
La présente invention concerne un procédé de correction des erreurs de localisation provoquées par une inhomogénéité de champ et d'obtention d'informations de position d'un marqueur sans fil dans un scanner IRM. Dans un mode de réalisation, ledit procédé comprend les étapes consistant à : a) fournir ledit marqueur sans fil dans un espace de travail ; b) réaliser une séquence d'impulsions avec ledit scanner IRM, comprenant : i) l'excitation de toutes les spins à l'intérieur dudit espace de travail ; ii ) l'application de gradients de préphasage dans un codage fréquentiel ; iii) l'application de gradients de déphasage selon deux directions orthogonales à ladite direction de codage fréquentiel, et iv) l'application de deux gradients de lecture de même amplitude et de polarités opposées selon ladite direction de codage fréquentiel pour former un premier et un second écho de gradient, c) acquérir un premier et un second signal MR à l'aide d'un réseau de bobines réceptrices RF par échantillonnage respectivement desdits premier et second échos de gradient, d) reconstruire les signaux de suivi à partir desdits premier et second signaux RM et calculer lesdites informations de position.