4 research outputs found

    Rabbit acquisitions.

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    <p><b>(a, b)</b> Axial TrueFISP slices of different rabbits showing the improved uniformity achieved with the proposed coil. <b>(c, d)</b> Coronal SNR maps with selected rectangular regions of interest and corresponding mean values. The higher increase in SNR is visible at the ends of the coil.</p

    Electrical design of the coil.

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    <p><b>(a)</b> Schematic design with actual component values. The interfacing circuit of channel <b><i>Q</i></b> and the tuning capacitor of channel <b><i>I</i></b> (1-23p) are shown. The bold lines represent copper traces conforming the resonator. <b>(b)</b> PCB design with zoomed panel showing one parallel plate capacitor in transparency (black circle). The blue and red regions represent the copper sections on the inner and outer surfaces, respectively. <b>(c)</b> Picture of the resonator showing interfacing circuits (<b><i>Q</i></b> and <b><i>I</i></b>) and cable traps. <b>(d)</b> PCB design of the shield (one of four sections). The blue and red traces represent the gaps on the inner and outer copper surfaces, respectively. <b>(e)</b> Picture showing outer surface of the shield. The arrows show copper regions created to improve RF isolation.</p

    Phantom acquisitions at the isocenter.

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    <p><b>(a, b)</b> SNR maps, computed from the Gradient Echo Multi Slice (GEMS) images of the mineral oil phantom, showing better uniformity and reduced SNR with the proposed coil. The small white circles show the areas with maximum and minimum pixel intensities. The subregions of interest (10x10pixels) used to calculate the uniformity were selected inside these circles. <b>(c, d)</b> SNR maps calculated from Fast Spin Echo Multiple Slice images of the water/NaCl/sugar phantom, showing increased SNR (41.8%) with the proposed coil in a selected circular ROI. The numbers in white are the corresponding average SNR computed inside these ROIs.</p

    Mechanical design of the coil.

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    <p><b>(a)</b> CAD design and <b>(b)</b> picture of the coil assembly. <b><i>Q</i></b> and <b><i>I</i></b> are BNC terminals connected to the cable traps by RG-223 coaxial cables. Tuning and matching can be adjusted for each channel by means of the red and blue knobs attached to fiberglass rods extensions of the corresponding capacitors. A handle and a simple holding mechanism facilitate the installation and fastening of the coil into the magnet bore.</p
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