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Magnetic Resonance Imaging01:24

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Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...
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The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
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The MRDust: Wireless Data Uplink & Localization via Magnetic Resonance Image Modulation.

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    We present a novel wireless method for data transmission and localization from miniaturized implants using magnetic resonance imaging (MRI). This technique modulates MRI signals, enabling simultaneous data readout and easy device tracking.

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    Area of Science:

    • Biomedical Engineering
    • Medical Imaging
    • Implantable Devices

    Background:

    • Miniaturized implants require efficient wireless data transmission and localization.
    • Magnetic Resonance Imaging (MRI) offers non-invasive imaging but faces challenges in real-time data acquisition from small internal devices.

    Purpose of the Study:

    • To develop a wireless data uplink and localization method for miniaturized sensor implants using MRI.
    • To demonstrate the feasibility of modulating local MRI signals with an integrated circuit (IC) micro-coil.

    Main Methods:

    • A micro-coil on an integrated circuit (IC) was designed to dynamically modulate local MRI signals.
    • A proof-of-concept chip was tested in a 3T MRI scanner to validate MR image modulation.
    • The method was evaluated for its capability in data uplink and device localization.

    Main Results:

    • Successful modulation of MR images was demonstrated using the designed chip.
    • The proposed approach facilitates wireless data readout from miniaturized implants.
    • Easy device localization and built-in image registration were achieved.

    Conclusions:

    • The developed wireless uplink and localization method shows promise for miniaturized sensor implants.
    • This technique enables simultaneous data acquisition from multiple implants within an MRI scanner.
    • The integration of micro-coils on ICs offers a pathway for advanced implantable sensor functionalities.