This thesis consists of two parts; NMR algorithm in part 1 and RF coil/coupler design in part 2 respectively.
In part 1, a 2 and 3-D image reconstruction algorithm, using direct Fourier transform technique along with a new projection scheme and Fourier domain interpolation, is proposed. The new proposed method does not require backprojection procedure unlike the conventional Fourier convolution backprojection method so that reconstruction can be performed with greater speed and simplicity.
Further we have investigated possibility of applying the new method to NMR tomographic imaging in which some advantages were found. Some unique features of the new imaging method when applied to NMR tomography have been studied, especially advantages and disadvantages of the method compared with Fourier convolution backprojection method.
In part 2, an RF coil and coupler unit for 1 KG (corresponding to Lamor frequency of 4.257 MHz) static magnetic field has been designed and analyzed. This unit transmits the high RF power to the object without any significant impact on receiver, and also receives the nuclear signal in the form of FID which is induced by RF coil.
We have considered various factors in designing the RF coil/coupler scheme suitable for 1 KG NMR imaging experiment of human head section. A frame supporting the RF coil has also been designed and installed.
Overall operations and performances are tested and experimented.
동심정방향 sampling 방법을 개선하고, 보다 우수한 특성을 갖는 interpolation 방안을 고안하여, 이로부터 Fourier 변환을 통해 3차원 영상을 재구성하는 algorithm 을 제시하고 있다.
나아가서 이 기법을 핵자기 공명 단층촬영에 응용하는 방안을 모색하고 그 가능성을 computer simulation 을 통해 검증하였다.
한편, 연관된 project 로서, 1 KG자장을 이용한 핵자기 공명 단층 촬영 system 에서 인체에 에너지를 주고 받는 부분 (RF COIL/COUPLER UNIT) 에 대한 설계 및 실험결과를 보이고 있다.