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      KCI등재 SCOPUS SCIE

      The design of a body RF coil for low-field open MRI using pseudo electric dipole radiation and simulated annealing

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      https://www.riss.kr/link?id=A104325329

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      다국어 초록 (Multilingual Abstract)

      The paper presents a new body RF coil design scheme for a low-field open MRI system. The RF coil is composed of four rectangular loops which are made of wide copper strips located near the surfaces of the bottom and top pole faces of the permanent magnet. The body RF coil has been designed by using the pseudo electric dipole radiation (PEDPR) method with the Metropolis algorithm. In the calculation of the RF fields via the finite difference time domain (FDTD) method, the computational time increases as the RF frequency becomes lower.Moreover, the computational process using the FDTD method takes a very long time when the RF coil is optimized. The optimization requires varying the configuration of the RF coil system and performing successive calculations of field strength and field homogeneity. When we perform these successive calculations, the computational time can be reduced by using the PEDPR method, where the segmented current elements of the RF coil are treated as pseudo electric dipole radiation sources.
      Because the RF coil is made of wide strips, the variation of the current density on the strip has been considered in the B1-field calculation. Foreach configuration of the RF coil system, the current distribution is calculated via circuit analysis, where each copper strip is considered as a parallel combination of current element lines. The preliminary field calculation study by the FDTD method verifies both the circuit analysis method for the current distribution and the PEDPR method for the radiation field strength. The optimization of the RF coil configuration is performed by the Simulated Annealing (SA) process using the Metropolis algorithm. Simulations have been performed for a 10 MHz RF frequency. The optimized RF coil has four rectangular loops of 37 cm × 100 cm with 6.5 cm wide strips which are separated vertically 49 cm and horizontally center-to-center 63 cm. In the 25 cm diameter of spherical volume (DSV), the design results show a good field inhomogeneity of the B1-field below 0.49 dB (5.8%).
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      The paper presents a new body RF coil design scheme for a low-field open MRI system. The RF coil is composed of four rectangular loops which are made of wide copper strips located near the surfaces of the bottom and top pole faces of the permanent mag...

      The paper presents a new body RF coil design scheme for a low-field open MRI system. The RF coil is composed of four rectangular loops which are made of wide copper strips located near the surfaces of the bottom and top pole faces of the permanent magnet. The body RF coil has been designed by using the pseudo electric dipole radiation (PEDPR) method with the Metropolis algorithm. In the calculation of the RF fields via the finite difference time domain (FDTD) method, the computational time increases as the RF frequency becomes lower.Moreover, the computational process using the FDTD method takes a very long time when the RF coil is optimized. The optimization requires varying the configuration of the RF coil system and performing successive calculations of field strength and field homogeneity. When we perform these successive calculations, the computational time can be reduced by using the PEDPR method, where the segmented current elements of the RF coil are treated as pseudo electric dipole radiation sources.
      Because the RF coil is made of wide strips, the variation of the current density on the strip has been considered in the B1-field calculation. Foreach configuration of the RF coil system, the current distribution is calculated via circuit analysis, where each copper strip is considered as a parallel combination of current element lines. The preliminary field calculation study by the FDTD method verifies both the circuit analysis method for the current distribution and the PEDPR method for the radiation field strength. The optimization of the RF coil configuration is performed by the Simulated Annealing (SA) process using the Metropolis algorithm. Simulations have been performed for a 10 MHz RF frequency. The optimized RF coil has four rectangular loops of 37 cm × 100 cm with 6.5 cm wide strips which are separated vertically 49 cm and horizontally center-to-center 63 cm. In the 25 cm diameter of spherical volume (DSV), the design results show a good field inhomogeneity of the B1-field below 0.49 dB (5.8%).

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      참고문헌 (Reference)

      1 J. Chen, 45 : 650-, 1998

      2 N. Metropolis, 21 : 1087-, 1953

      3 S. Crozier, 103 : 354-, 1993

      4 H. Geen, 93 : 93-, 1991

      5 C.J. Hardy, 77 : 233-, 1988

      6 W.C. Chew, "Waves and Fields in Inhomogeneous Media" IEEE Press 1995

      7 K.S. Kunz, "The Finite Difference Time Domain Method for Electromagnetics" CRC Press 1993

      8 F.W. Grover, "Inductance Calculations" D. Van Nostrand Company 1947

      9 Fawwaz Ulaby, "Electromagnetics for Engineers. Pearson Education International" Upper Saddle River 2005

      1 J. Chen, 45 : 650-, 1998

      2 N. Metropolis, 21 : 1087-, 1953

      3 S. Crozier, 103 : 354-, 1993

      4 H. Geen, 93 : 93-, 1991

      5 C.J. Hardy, 77 : 233-, 1988

      6 W.C. Chew, "Waves and Fields in Inhomogeneous Media" IEEE Press 1995

      7 K.S. Kunz, "The Finite Difference Time Domain Method for Electromagnetics" CRC Press 1993

      8 F.W. Grover, "Inductance Calculations" D. Van Nostrand Company 1947

      9 Fawwaz Ulaby, "Electromagnetics for Engineers. Pearson Education International" Upper Saddle River 2005

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      학술지 이력

      학술지 이력
      연월일 이력구분 이력상세 등재구분
      2023 평가예정 해외DB학술지평가 신청대상 (해외등재 학술지 평가)
      2020-01-01 평가 등재학술지 유지 (해외등재 학술지 평가) KCI등재
      2008-01-01 평가 등재학술지 선정 (등재후보2차) KCI등재
      2007-01-01 평가 등재후보 1차 PASS (등재후보1차) KCI등재후보
      2003-01-01 평가 등재후보학술지 선정 (신규평가) KCI등재후보
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      학술지 인용정보

      학술지 인용정보
      기준연도 WOS-KCI 통합IF(2년) KCIF(2년) KCIF(3년)
      2016 1.8 0.18 1.17
      KCIF(4년) KCIF(5년) 중심성지수(3년) 즉시성지수
      0.92 0.77 0.297 0.1
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