Sensitivity Assessment of Spiral RF Surface Coils for MR Microscopic Imaging and Spectroscopy

자기공명미세영상 및 분광법을 위한 나선형 RF 표면코일의 감는 횟수에 따른 민감도 평가

  • Woo, Dong-Cheol (Department of Biomedical Engineering, College of Medicine, The Catholic University of Korea) ;
  • Ha, Seung-Hoon (Department of Radiological Sciences, University of California) ;
  • Choi, Chi-Bong (Department of Biomedical Engineering, College of Medicine, The Catholic University of Korea) ;
  • Choe, Bo-Young (Department of Biomedical Engineering, College of Medicine, The Catholic University of Korea)
  • 우동철 (가톨릭대학교 의과대학 의공학교실) ;
  • 하승훈 ;
  • 최치봉 (가톨릭대학교 의과대학 의공학교실) ;
  • 최보영 (가톨릭대학교 의과대학 의공학교실)
  • Published : 2006.09.30

Abstract

The purpose of this study was to improve the technique so as to develop an advanced sensitive RF surface coil for investigating the sensitivities of the multi-spiral surface coils, and we eventually wanted to achieve high resolution of the microscopic MR images and MR spectra. The magnetic field inhomogeneity and shape of a surface coil were statistically estimated by simulation of the magnetic field distribution. On the basis of the experimental results with single, 3 and S-turned spiral RF surface coils, we found that the 3-turned coil had the highest sensitivity. The present study showed that the sensitivity of the RF surface coil was improved by increasing the number of spiral coil turns, and also the SNR of the RF surface coil was dependent upon the number of spiral coil turns. However, we found, rather strikingly, that the sensitivity of excessive turns of the coils was decreased due to the rise of the coil's Impedance. Thus, the present results demonstrated that the sensitivity was not proportional to the number of a spiral RF coil's turns, and the number of spiral coil turns should be optimized for obtaining the highest sensitivity and SNR.