ZTE UTE MRI for Deep Brain Stimulation Electrode Localization
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Solution Overview
Problem
Current post-operative imaging techniques for deep brain stimulation (DBS) electrodes, such as CT and long-readout MR imaging, often result in imperfect localization due to artifacts, leading to potential suboptimal outcomes and the need for reoperation, especially when differences between intended and actual electrode locations exceed 1 mm.
Innovation Solution
A system and method utilizing zero or ultra-short echo time (ZTE/UTE) magnetic resonance imaging to acquire and analyze image data, allowing for precise localization of DBS electrodes by estimating their orientation and identifying individual contact locations through phase and magnitude domain analysis, enabling accurate and efficient post-implantation localization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If CT imaging is used for post-operative electrode localization, then the imaging speed is fast, but beam hardening artifacts cause imperfect localization accuracy
Solution Approach 1:
The patent replaces CT imaging (which uses X-ray radiation and suffers from beam hardening artifacts) with MR imaging using ZTE/UTE pulse sequences. This substitution eliminates the harmful beam hardening artifacts while maintaining the ability to visualize the electrode, thereby improving localization accuracy without sacrificing imaging speed.
2Measurement precision
If long-readout MR imaging is used for post-operative electrode localization, then soft tissue contrast is improved, but susceptibility induced signal loss causes imperfect electrode localization
Solution Approach 1:
The patent changes the MR imaging parameters by using ZTE/UTE pulse sequences with ultra-short echo times instead of conventional long-readout sequences. This parameter change allows the imaging system to acquire data before susceptibility-induced signal loss can occur, thereby improving electrode localization accuracy while maintaining soft tissue contrast.
3Measurement precision
If standard MR imaging techniques are used, then electrode localization can be performed, but the scan time is long and productivity is reduced
Solution Approach 1:
The ZTE/UTE pulse sequence enables continuous and efficient data acquisition by utilizing the ultra-short echo time to capture signal information quickly and continuously. This continuous action reduces the overall scan time while maintaining the accuracy needed for electrode localization, thereby improving productivity without sacrificing measurement precision.
4Ease of operation
If CT imaging is used for electrode localization, then the process is simple and easy to perform, but the localization precision is insufficient due to signal bloom artifacts
Solution Approach 1:
The patent substitutes CT imaging with ZTE/UTE MR imaging. While MR imaging may require slightly more complex protocols, the elimination of beam hardening artifacts and signal bloom artifacts provides superior localization precision, making the trade-off worthwhile for achieving accurate electrode positioning.
5Shape
If conventional MR imaging is used for electrode localization, then soft tissue visualization is good, but the scan time is excessive and time efficiency is low
Solution Approach 1:
The patent applies parameter changes by using ZTE/UTE pulse sequences with ultra-short echo times. This allows the imaging system to maintain excellent soft tissue visualization quality while dramatically reducing scan time, as the ultra-short echo time enables rapid data acquisition before signal loss occurs, thereby minimizing time loss without sacrificing tissue visualization.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The ZTE/UTE imaging technique provides higher accuracy and precision in localizing DBS electrodes, reducing localization errors compared to standard methods, and allowing for selective activation of specific electrode contacts, thus improving treatment efficacy and reducing the need for reoperation.
Implementation Method 1
the image data acquired via a zero echo time (ZTE) or ultrashort echo time (UTE) pulse sequence performed by the MR imaging system... analysis of signal dephasing during readout of the ZTE or UTE pulse sequence
Data Source
AI summary
A system and method for localizing a deep brain stimulation electrode in vivo in a subject or object is provided. A magnetic resonance imaging system obtains MR image data from a volume-of-interest by way of a zero echo time (ZTE) or ultrashort echo time (UTE) pulse sequence, with one or more of a phase domain image and a magnitude domain image being analyzed from the MR image data acquired by the ZTE or UTE pulse sequence. One or more electrodes are localized within the volume-of-interest based on an analysis of the phase domain image and/or magnitude domain image. In localizing the electrodes, a multi-scale correlation-based analysis of the volume-of-interest is performed to estimate at least one of an electrode center and electrode contact locations of the electrode, with the localization being achieved with a fast scan-time and with a high level of accuracy and precision.