JOURNAL OF RADIOGRAPHY AND RADIATION SCIENCES (JRRS)
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DEVELOPMENT AND OPTIMISATION OF SURFACE AND VOLUME RADIOFREQUENCY COILS SUITABLE FOR FAST-FIELD-CYCLING MAGNETIC RESONANCE IMAGING (FFC-MRI)
Umar Abubakar, Lionel Broch, Chukwuka Anthony Ugwu, Sadiq Abubakar Audu, Mohammed Danfulani, Abacha Mohammed, Mohammed Abba, Nike Mutiat Miftaudeen
Objective: To evaluate a modelling and design methodology employed in constructing and optimizing radiofrequency (RF) coils suitable for use with the whole-body fast-field-cycling Magnetic Resonance Imaging (FFC-MRI). It is also aimed at comparing the sensitivity and the signal-to-noise ratio (SNR) of the various types of surface RF coils constructed at the initial and final stages of this research.
Methodology: An experimental study carried out at Biomedical MRI Laboratory at University of Aberdeen. Various designs of RF coil were constructed, optimized and tested with network/signal analyser for use with an experimental FFC – MRI scanner, operating at a detection magnetic field of 0.2 T (proton Larmor frequency of 8.5 MHz). The coils comprised circular loop (CL) RF – receive surface coil and a birdcage RF – transmit volume coil. The intrinsic parameters of the CL coils were measured using a search-coil field probe and a network/signal analyser.
Results: The CL surface coil constructed with copper wire had resonant frequency of 8.46 MHz and Quality factor (Q – factor) of 47.1 while the resonant frequency of the one constructed with litz wire was 8.54 MHz and Q – factor of 85.4 MHz. The intrinsic parameter of the birdcage volume coil was 8.48 MHz and Q – factor of 102.
Conclusion: Bench testing of the coils showed promise as receiver and transmit coils for the FFC-MRI system
Keywords: Fast field cycling MRI, Circular Loop Coil, Birdcage coil, Q- factor
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Abubakar U, Broch L, Ugwu AC, Audu SA, Danfulani M, Mohammed A, Abba M, Miftaudeen NM. Development and optimisation of surface and volume radiofrequency coils suitable for fast-field-cycling magnetic resonance imaging (FFCMRI). J Rad & Radiat Sci, 2018; 32 (1): 46 – 56. https://doi.org/10.48153/jrrs/2018/UQOU4869
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