tFUS Beam Navigation Using Subject-Specific Skull Acoustic Profiles
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Solution Overview
Problem
The distortion of the tFUS beam by structures such as the skull poses a significant barrier to accurate delivery of acoustic energy to the correct location in the brain, hindering the clinical translation of transcranial focused ultrasound stimulation (tFUS).
Innovation Solution
A system and method for subject-specific planning and real-time navigation of tFUS that utilizes pre-calculated acoustic beam profiles to account for non-uniform propagation through the skull, including an acoustic beam profile simulation module, a planning module, and a real-time navigation module, which generate 3D visualizations and intensity maps to guide precise tFUS delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If transcranial focused ultrasound stimulation is used to target deep brain structures, then high spatial precision is achieved, but accurate delivery of acoustic energy is distorted by skull structures
Solution Approach 1:
The system performs pre-calculations of subject-specific acoustic beam profiles that account for skull distortion effects before actual tFUS treatment. This preliminary modeling allows the system to predict and compensate for acoustic distortions, enabling accurate energy delivery to deep brain targets despite the interfering skull structures.
Solution Approach 2:
The system creates virtual 3D copies of the patient's head anatomy using MRI images to generate acoustic intensity scalp maps and beam profile visualizations. These digital models serve as virtual replicas that allow planning and navigation without requiring physical trial-and-error positioning, thereby ensuring accurate acoustic energy delivery.
2Measurement precision
If subject-specific acoustic beam profiles are pre-calculated for multiple transducer locations, then accurate targeting is enabled, but computational complexity and processing time increase
Solution Approach 1:
The system performs pre-calculations of subject-specific acoustic beam profiles for multiple transducer locations before the actual treatment session. This preliminary computational work creates a library of pre-planned beam profiles that can be quickly referenced during real-time navigation, reducing on-the-fly computational requirements while maintaining high targeting accuracy.
Solution Approach 2:
The system transforms the complex 3D acoustic propagation problem through the skull into 2D acoustic intensity scalp maps that can be visually interpreted and navigated. This dimensional transformation simplifies the representation of complex acoustic fields while preserving the essential spatial information needed for accurate targeting.
3Measurement precision
If real-time 3D visualization of acoustic beams is provided during tFUS, then navigation precision is improved, but computational processing time increases
Solution Approach 1:
The system pre-calculates and stores subject-specific acoustic beam profiles for multiple transducer locations before the treatment session. During real-time navigation, the system simply retrieves and displays the appropriate pre-computed beam profile based on the current transducer position, providing immediate visual feedback without requiring time-consuming on-the-fly calculations.
Solution Approach 2:
The system replaces complex real-time acoustic simulations with pre-computed beam profile data that is rapidly retrieved and displayed. This substitution of computational mechanics with pre-prepared data allows for real-time visualization performance that would be impossible through direct simulation during the treatment procedure.
4Measurement precision
If acoustic intensity scalp maps are generated for target regions, then treatment planning accuracy is improved, but computational resources required increase
Solution Approach 1:
The system generates acoustic intensity scalp maps for target regions as part of the pre-treatment planning phase. By performing this computationally intensive task before the actual treatment session, the system allows for accurate treatment planning while preserving computational resources during the time-critical real-time navigation and delivery phases.
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
Enables accurate and precise targeting of deep brain structures by compensating for skull distortions, allowing for improved clinical efficacy of tFUS treatments.
Implementation Method 1
acoustic beam profiles that account for non-uniform propagation through the skull
Data Source
AI summary
A system for planning and real-time navigation for transcranial focused ultrasound stimulation (tFUS) including receiving an image of a head of a subject, an acoustic beam profile simulation module configured to generate a subject-specific set of acoustic beam profiles based on the subject's head; subject-specific set of acoustic beam profiles configured to account for acoustic propagation effects through the subject's skull; a planning module coupled to the acoustic beam profile simulation module configured to generate an acoustic intensity scalp map for a target region and to generate a three-dimensional (3D) visualization of a selected beam profile from the subject-specific set of acoustic beam profiles; and a real-time navigation module coupled to the acoustic beam profile simulation module configured to generate a real-time 3D visualization of an acoustic beam for tFUS for a current position of a transducer around the head of the subject based on current position data and the subject-specific set of acoustic beam profiles.