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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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A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
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Positron emission tomography (PET) is a medical imaging technique involving radiopharmaceuticals — substances that emit short-lived radiation. Although the first PET scanner was introduced in 1961, it took 15 more years before radiopharmaceuticals were combined with the technique and revolutionized its potential.
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Whole-body PET/MRI of Pediatric Patients: The Details That Matter
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A Novel J-Shape Antenna Array for Simultaneous MR-PET or MR-SPECT Imaging.

Chang-Hoon Choi, Suk-Min Hong, Jorg Felder

    IEEE Transactions on Medical Imaging
    |December 3, 2021
    PubMed
    Summary

    A novel J-shape antenna design enables simultaneous magnetic resonance (MR) and positron emission tomography/single-photon emission computed tomography (PET/SPECT) imaging without compromising image quality. This advancement is crucial for hybrid imaging systems, improving performance in both combined and standalone applications.

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    Area of Science:

    • Medical Imaging
    • Biophysics
    • Electrical Engineering

    Background:

    • Simultaneous MR-PET/-SPECT offers combined benefits of soft-tissue contrast and functional imaging.
    • Integrating MRI coils within PET/SPECT fields-of-view poses challenges to system performance and image quality.
    • Optimizing hybrid imaging requires MRI components that do not interfere with PET/SPECT data acquisition.

    Purpose of the Study:

    • To develop and validate a novel gamma-radiation-transparent antenna for ultra-high field MR-PET/-SPECT systems.
    • To assess the antenna's performance in both simultaneous hybrid and standalone MR applications.
    • To ensure the new antenna design does not compromise system performance or image quality.

    Main Methods:

    • Designed and implemented an end-fed J-shape antenna, positioning attenuating materials outside the imaging field-of-view.
    • Experimentally verified the antenna's performance for ultra-high field MRI and 511 keV PET transmission scans.
    • Compared the proposed antenna array with a conventional dipole antenna array in terms of attenuation and MR signal-to-noise ratio.

    Main Results:

    • The J-shape antenna demonstrated significantly lower attenuation (~15% less) compared to conventional dipole arrays due to the absence of high-density components.
    • MR imaging using the proposed array achieved signal-to-noise ratios comparable to conventional arrays, consistent with simulation results.
    • The novel design effectively minimizes interference and maintains performance in hybrid and standalone configurations.

    Conclusions:

    • The J-shape antenna is a viable solution for simultaneous MR-PET/-SPECT, overcoming limitations of conventional designs.
    • This antenna technology enables high-quality hybrid imaging without compromising performance compared to standalone systems.
    • The design offers potential improvements for standalone MR applications by reducing cable coupling and specific absorption rate.