CAJ | 학술논문

为了在单边磁体产生的逸散磁场中实现核磁共振技术，信号检测深度能满足相关应用需求，该文分析了非均匀磁场下的核磁共振技术条件，确定射频场目标，设计了单边平面射频线圈和探头，搭建出一套单边核磁共振实验系统．探头具有短脉宽(90°脉宽2.5μs)，系统死时间短(10μs)的特点，可实现15μs的半回波时间．应用该系统，在15.3 T/m的巨大梯度磁场下，实现接近5 mm厚度的信号检测，并利用单边磁体的自然梯度磁场，开展了恒定梯度磁场下的扩散测量方法探索．结果表明，该系统可满足需要一定探测深度的领域的应用需求．
위료재단변자체산생적일산자장중실현핵자공진기술，신호검측심도능만족상관응용수구，해문분석료비균균자장하적핵자공진기술조건，학정사빈장목표，설계료단변평면사빈선권화탐두，탑건출일투단변핵자공진실험계통．탐두구유단맥관(90°맥관2.5μs)，계통사시간단(10μs)적특점，가실현15μs적반회파시간．응용해계통，재15.3 T/m적거대제도자장하，실현접근5 mm후도적신호검측，병이용단변자체적자연제도자장，개전료항정제도자장하적확산측량방법탐색．결과표명，해계통가만족수요일정탐측심도적영역적응용수구．
The goal of the study is to design and construct a system that can be used to detect magnetic resonance signals generated in the stray magnetic field produced by fully-opened unilateral magnets. The radiofrequency (RF) probe was carefully designed to meet the detection depth requirement for specific applications, and tested on a unilateral nuclear magnetic resonance experiment system. The probe had a 90o pulse width as short as 2.5 s. The whole system has a short system dead time (i.e., 10 s), and the minimum half echo time was 15 s. The SGSE-CPMG experiment was performed on the system to acquire signals from a depth of 5 mm under a constant B0 gradient of 15.3 T/m. Diffusion coefficients were measured under the constant B0 gradient.