Portable Neonatal MRI With Halbach Array for Bedside Imaging
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Solution Overview
Problem
Current MRI technologies face significant barriers for use in neonatal care due to their large size, heavy weight, and the need for transporting critically ill neonates, which disrupts care, exposes patients to radiation, and lacks sensitivity and specificity for early brain injury diagnosis.
Innovation Solution
A portable neonatal MRI system using a Halbach array of permanent magnetic elements and a movable patient bed, allowing bedside imaging with reduced noise and minimal disruption, incorporating a gradient coil and RF coil for efficient imaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional MRI scanners are used, then imaging quality and sensitivity are improved, but device size and weight increase, requiring patient transport and disrupting care
Solution Approach 1:
The MRI system is divided into separate functional modules: a portable permanent magnet unit, a gradient coil assembly, and an RF coil system. This segmentation allows the scanner to be broken into transportable components that can be assembled at the bedside, eliminating the need for moving a complete traditional scanner while maintaining imaging capability.
Solution Approach 2:
The system replaces the large, heavy electromagnet assembly of traditional MRI scanners with a permanent magnet-based system. The Halbach array of permanent magnets generates the necessary magnetic field without requiring the massive electrical infrastructure and cooling systems of conventional scanners, dramatically reducing weight and enabling portability.
2Reliability
If traditional MRI scanners are used, then diagnostic sensitivity is improved, but patient transport is required, exposing patients to radiation and disrupting care
Solution Approach 1:
The system introduces an intermediary transport solution by bringing the MRI scanner to the patient's bedside rather than moving the patient to the scanner. The portable scanner can be positioned next to the incubator or bed, allowing imaging to be performed in the patient's familiar environment without exposing them to radiation from CT scans or the stress of transport to a dedicated MRI suite.
3Ease of operation
If portable MRI system is used, then patient transport is eliminated and care disruption is reduced, but acoustic noise is generated during imaging
Solution Approach 1:
The system addresses acoustic noise by incorporating active noise cancellation technology that generates sound waves opposite in phase to the scanner's operational noise. This converts the harmful acoustic effect into a beneficial cancellation mechanism, reducing the noise level to acceptable ranges while maintaining the portable bedside imaging capability.
4Weight of moving object
If permanent magnet array is used, then scanner portability is improved, but magnetic field homogeneity becomes challenging
Solution Approach 1:
The system applies local quality by using a Halbach array configuration where permanent magnets are arranged in a specific pattern to create a focused, homogeneous magnetic field in the imaging region. The gradient coils are strategically positioned to provide localized field adjustments, ensuring uniform magnetic field distribution across the small neonatal brain volume while maintaining overall system portability.
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 high-quality diagnostic imaging at the bedside with reduced acoustic noise, eliminating the need for patient transport and minimizing disruption to care, while providing sensitive and specific diagnostic information for brain injuries.
Implementation Method 1
A portable neonatal MRI system using a Halbach array of permanent magnetic elements
Implementation Method 2
The static main magnetic field (B0) is generated by a static magnet of several magnetic elements arranged in an array
Implementation Method 3
The system may further include a gradient coil and an imaging radiofrequency (RF) coil
Implementation Method 4
The system may further include a gradient coil and an imaging radiofrequency (RF) coil
Data Source
AI summary
A system and method are provided that include a portable neonatal magnetic resonance imaging (MRI) system. The system includes a static (B0) magnet comprising a plurality of magnetic elements arranged in a bulb array, a gradient coil, a patient bed movable relative to the B0 magnet and one or more gradient coils, and an imaging radiofrequency coil. A method for manufacturing is provided in which the arrangement of magnetic elements is optimized to produce a target magnetic field within a target scanning volume.