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Multiple-mouse Neuroanatomical Magnetic Resonance Imaging
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4D Functional Imaging of the Rat Brain Using a Large Aperture Row-Column Array.

Jack Sauvage, Jonathan Poree, Claire Rabut

    IEEE Transactions on Medical Imaging
    |December 17, 2019
    PubMed
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    This study introduces a novel 4D functional ultrasound imaging (fUS) method using a low-channel Row Column Addressing (RCA) probe for whole-rat brain imaging. This advance enables high-resolution, real-time monitoring of brain activity in preclinical research.

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    Area of Science:

    • Neuroimaging
    • Biomedical Engineering
    • Ultrasound Technology

    Background:

    • Functional ultrasound imaging (fUS) is a powerful tool for monitoring brain activity via cerebral blood volume (CBV) changes.
    • Current 4D fUS methods are complex and require high channel counts, limiting their preclinical application.
    • Row Column Addressing (RCA) offers a reduced channel count alternative for ultrasound imaging.

    Purpose of the Study:

    • To develop and validate a large field-of-view 4D fUS system using RCA for preclinical brain imaging.
    • To demonstrate the feasibility of high-volume rate 4D vascular brain acquisitions in vivo.
    • To detect functional brain activation using the developed 4D fUS system.

    Main Methods:

    • Development of a 128+128 channel RCA probe with a 15 MHz central frequency.
    • Implementation of Orthogonal Plane Wave compounding for 4D acquisitions.
    • In vivo Doppler volumetric imaging of the whole rat brain at high frame rates (up to 313 Hz).

    Main Results:

    • Successful in vivo 4D vascular brain imaging of the entire rat brain at high volume rates (e.g., 156 Hz with 23 dB CNR).
    • Reconstruction of 3D CBV changes in response to visual and whisker stimulation.
    • Detection of functional brain activation in the superior colliculus and somatosensory cortex.

    Conclusions:

    • The study demonstrates the first use of a low-channel RCA array for in vivo 4D fUS imaging of the whole rat brain.
    • This RCA-based 4D fUS approach offers a simplified and effective method for preclinical neuroimaging.
    • The technology holds promise for advancing the study of brain function and neurovascular coupling.