Neuroimaging Headset Segmentation for Scalp Proximity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing neuroimaging headsets face challenges in positioning superconducting quantum interference devices (SQUIDs) close to the scalp while maintaining them at a low temperature and insulating the patient from the cold, due to the bulkiness and rigidity of the dewar, which limits the detection of magnetic fields generated by neural activity.
Innovation Solution
A detachable temperature-controlled headset with pick-up devices and an interface for communicating measurement signals, allowing for a separate cooling system for the headset that maintains the SQUIDs at a lower temperature than the environment, enabling closer proximity to the scalp without the need for a bulky dewar.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the dewar is used to maintain SQUIDs at low temperature, then the SQUIDs can be kept superconducting, but the apparatus becomes bulky and rigid
Solution Approach 1:
The system is divided into two separate modules: a compact temperature-controlled chamber that maintains SQUIDs at superconducting temperatures, and a separate head unit that positions pick-up coils close to the scalp. These modules are connected via magnetic coupling, allowing the bulky cooling system to be separated from the patient-contact portion.
Solution Approach 2:
A magnetic coupling interface acts as an intermediary between the temperature-controlled chamber and the head unit. This interface allows magnetic field transmission while providing thermal insulation, enabling the SQUID signals to be transmitted to the pick-up coils without direct thermal contact.
2Measurement precision
If the pick-up coils are positioned close to the scalp, then the magnetic field detection sensitivity is improved, but the thermal insulation requirements increase
Solution Approach 1:
The system separates the thermal management function (in the temperature-controlled chamber) from the signal detection function (in the head unit). This allows the pick-up coils to be positioned close to the scalp for high sensitivity while the thermal insulation requirements are concentrated in the detached cooling chamber.
Solution Approach 2:
The magnetic coupling interface serves as a thermal barrier that transmits magnetic signals while blocking heat transfer. This intermediary allows the pick-up coils to operate at room temperature near the scalp while the SQUIDs remain cryogenically cooled in the separate chamber.
3Reliability
If a fixed dewar structure is used, then the SQUIDs are maintained at stable temperature, but the apparatus cannot accommodate various head sizes and orientations
Solution Approach 1:
The detachable head unit can be removed and replaced with different units designed for various head sizes and orientations. The temperature-controlled chamber remains fixed to maintain stable SQUID operation, while the interchangeable head units provide adaptability for different patients including children, pregnant women, and non-human animals.
4Reliability
If the dewar is made bulky and rigid for thermal insulation, then the SQUIDs are well-insulated, but the headset cannot be detached or reconfigured
Solution Approach 1:
The system divides the thermal insulation function into a fixed, well-insulated temperature-controlled chamber that houses the SQUIDs, while the head unit is a separate, less insulated component that can be easily detached and reconfigured. The magnetic coupling interface connects these segments while maintaining thermal boundaries.
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
This configuration allows for improved detection of magnetic fields with reduced thermal insulation requirements, enabling higher spatial resolution and accommodating various head sizes and orientations, including those of children, pregnant women, and non-human animals, while maintaining the SQUIDs at a superconducting temperature.
Implementation Method 1
The SQUIDs must be kept at a very low temperature, e.g. about 4.2 K, so that they are superconducting
Implementation Method 2
pick-up devices for picking up respective measurement signals mounted in the head unit
Data Source
AI summary
There is described a neuroimaging apparatus in which a plurality of sensing devices, e.g. SQUIDs, are accommodated in a temperature-controlled chamber e.g. a dewar, has a detachable headset including a plurality of pick-up devices. The pick-up devices are arranged in the detachable headset to conform to a body part of a measurement subject. A plurality of different detachable headsets can have pick-up devices arranged for use with different body parts.