지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
초록· 키워드
오류제보하기
Injecting currents into an electrically conducting subject, we may measure the induced magnetic flux density distributions using an MRI scanner. The measured data are utilized to reconstruct cross-sectional images of internal conductivity and current density distributions in Magnetic Resonance Electrical Impedance Tomography (MREIT). Injection currents are usually provided in a form of mono-polar or bi-polar pulses synchronized with an MR pulse sequence. Given an MRI scanner performing the MR phase imaging to extract the induced magnetic flux density data, the current source becomes one of the key parts determining the signal-to-noise ratio (SNR) of the measured data. Since this SNR is crucial in determining the quality of reconstructed MREIT images, special care must be given in the design and implementation of the current source. This paper describes a current source design for MREIT with features including interleaved current injection, arbitrary current waveform, electrode switching to discharge any stored charge from previous current injections, optical isolation from an MR spectrometer and PC, precise current injection timing control synchronized with any MR pulse sequence, and versatile PC control program. The performance of the current source was verified using a 3T MRI scanner and saline phantoms.
목차
등록된 정보가 없습니다.
참고문헌 (23)
참고문헌 신청
/ 1991 / Measurement of nonuniform current density by magnetic resonance 10 : 362 ~ 374
/ 1992 / Electrical Impedance Tomography based on Current Density Imaging
/ 1992 / Sensitivity of magnetic resonance current density imaging 97 : 235 ~ 254
/ 1994 / Impedance tomography using internal current density distribution measured by nuclear magnetic resonance 2299 : 377 ~ 385
/ 1998 / Applied Bioelectricity: From Electrical Stimulation To Electropathology
/ 1992 / Electrical Impedance Tomography based on Current Density Imaging
/ 1992 / Sensitivity of magnetic resonance current density imaging 97 : 235 ~ 254
/ 1994 / Impedance tomography using internal current density distribution measured by nuclear magnetic resonance 2299 : 377 ~ 385
/ 1998 / Applied Bioelectricity: From Electrical Stimulation To Electropathology
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