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In ultra high field MRI systems (7 tesla and higher), the wavelength inside the body is short and smaller than the human anatomy at the Larmor frequency. At these shorter wavelengths, interference effects appear; the uniformity of the RF excitation B1+ field over the whole subject becomes inhomogeneous. The RF B1+ field generated by the RF coil is a maximum in the center along the length of the coil...
Radio frequency (RF) coils are an essential part of hardware in Magnetic Resonance Imaging (MRI) systems and are used to excite the magnetized protons inside the human body and receive the Nuclear Magnetic Resonance (NMR) signals from anatomy. These RF coils based on microstrip transmission line resonator, the TEM coil, that has been widely used for high field MRI and most coils use the L-matching...
RF coil with microstip transmission line elements have been used for high-fields magnetic resonance imaging (MRI) to inductively excite and receive the nuclear magnetic resonance signals in anatomy. These coil elements have narrow bandwidth due to its high quality factors (Qs). Although high signal-to-noise ratio (SNR) of RF coils is obtained from this property it has a critical drawback, loading...
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