简介：
Overview
This protocol outlines the use of functional ultrasound (fUS) for quantifying hemodynamic variations in the mouse brain. It showcases 3D functional activation mapping following sensory stimulation and resting-state functional connectivity in both anesthetized and awake mice.
Key Study Components
Area of Science
- Neuroimaging
- Cerebral hemodynamics
- Mouse models
Background
- Functional ultrasound allows mapping of hemodynamic changes in live rodent brains.
- It offers unmatched spatial and temporal resolution compared to traditional methods.
- FUS is accessible for the larger neuroscience community with the availability of commercial scanners.
- Facilitates studies in awake, freely moving subjects, reducing anesthesia-related biases.
Purpose of Study
- To demonstrate a protocol for transcranial functional ultrasound imaging in mice.
- To illustrate methods for capturing brain hemodynamic responses during sensory activation.
- To establish procedures for resting-state functional connectivity analysis.
Methods Used
- Functional ultrasound imaging system, utilizing ultra-fast plane wave imaging.
- Experimental model includes both anesthetized and awake mice for imaging sessions.
- Focus on preparation including eye ointment application, head shaving, and surgical head fixation.
- Detailed steps for optimizing imaging parameters and data acquisition processes.
- Includes techniques for data analysis and visualization in the Allen Mouse Common Coordinates Framework.
Main Results
- Exhibits the capability to perform high-resolution imaging of cerebral blood volume.
- Details the effectiveness of fUS in studying hemodynamic responses without anesthesia.
- Validates its application for both sensory stimulation and monitoring resting-state connectivity.
- Highlights acute post-operative care and recovery protocols for awake animal studies.
Conclusions
- This study illustrates a powerful imaging technique that enhances understanding of cerebral dynamics.
- It opens new avenues in behavioral studies through non-invasive imaging of awake subjects.
- Reveals the potential for fUS to facilitate understanding of neuronal mechanisms and functional brain connectivity.
What advantages does functional ultrasound have over traditional imaging techniques?
Functional ultrasound provides high portability, ease of use, and allows imaging of awake, freely moving subjects, minimizing anesthesia effects.
How are awake mice prepared for functional ultrasound imaging?
Awake mice require head fixation through surgical procedures to allow imaging without the confounding effects of anesthesia.
What types of hemodynamic data can be obtained using this method?
Functional ultrasound measures cerebral blood volume changes and can capture both sensory-evoked responses and resting-state connectivity aspects.
Can this protocol be adapted for other animal models?
While this protocol is optimized for mice, similar techniques can potentially be adapted to larger animal models with appropriate adjustments.
What are some limitations of functional ultrasound?
Functional ultrasound may have limitations in depth resolution and may require prior surgical interventions, which could affect experimental design.
What is the significance of using the Allen Mouse Common Coordinates Framework?
This framework allows precise alignment of functional data to anatomical structures, enhancing the accuracy of brain mapping studies.
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