脊柱和脊髓 Norman D 高分辨率MRI已取代了所有其它包括x线平片、CT及脊髓造影检查。由于MRI的物理特性与CT不同,如病人合作,MRI的对比细节优于CT几倍。椎体骨皮质结构缺乏运动氢质子,故表现为相对无信号(黑色),但在CT则是高密度(白色)。椎体内含骨髓和脂肪,在T_1加权像呈高信号(白色),在T_2加权图像(早回波)亦呈高信号。在中晚年后骨髓的造 Norman D high resolution MRI of the spine and spinal cord has replaced all others, including x-ray, CT and myelography. Due to the different physical characteristics of MRI compared with CT, MRI contrast details are several times better than CT. Vertebral cortical structure lack of exercise hydrogen proton, so the performance is relatively no signal (black), but CT is high density (white). Vertebral body contains bone marrow and fat, T_1 weighted image was high signal (white), T_2 weighted image (early echo) also showed high signal. In the middle-aged bone marrow made