切面超声显像,核素显像在心血管病中的应用被认为是七十年代心脏病领域划时代的进展。近年来,又出现了一种新的无创性医学成像技术——核磁共振显像(NMRI)。本文综述NMRI简要的物理学原理及其在心血管病诊断上的应用现状和展望。 一、NMRI的物理学原理 原子核内有质子和中子(氢核~1H属例外,核内只有一个质子)。质子是一种自旋的电荷,当其自旋时,可产生自旋磁场,在没有外加磁场作用的情况下,体内质子的自旋是杂乱而无统一方向的,因而不输出任何信号。当外加一个强而恒 Section ultrasound imaging, radionuclide imaging in the application of cardiovascular disease is considered to be the epoch-making progress in the field of heart disease in the seventies. In recent years, a new noninvasive medical imaging technique, nuclear magnetic resonance imaging (NMRI) has emerged. This article summarizes the brief physics principles of NMRI and its application status and prospect in the diagnosis of cardiovascular disease. First, the physics of NMRI principle Proton and neutrons in the nucleus (hydrogen nucleus ~ 1H exception, there is only one proton in the nucleus). Proton is a spin charge, when it spin, can produce spin magnetic field, in the absence of an applied magnetic field, the proton spin in vivo is not uniform and no uniform direction, and therefore does not output any signal. When plus a strong and constant