推荐回答（5个）
血管造影，是一种介入检测方法，将显影剂注入血管里。因为X光无法穿透显影剂，血管造影正是利用这一特性，通过显影剂在X光下所显示的影像来诊断血管病变的。
核磁共振是磁矩不为零的原子核，在外磁场作用下自旋能级发生塞曼分裂，共振吸收某一定频率的射频辐射的物理过程。核磁共振波谱学是光谱学的一个分支，其共振频率在射频波段，相应的跃迁是核自旋在核塞曼能级上的跃迁。
核磁共振应用：核磁共振成像（MRI）检查已经成为一种常见的影像检查方式，核磁共振成像作为一种新型的影像检查技术，不会对人体健康有影响，但六类人群不适宜进行核磁共振检查即：安装心脏起搏器的人、有或疑有眼球内金属异物的人、动脉瘤银夹结扎术的人、体内金属异物存留或金属假体的人、有生命危险的危重病人、幽闭恐惧症患者等。不能把监护仪器、抢救器材等带进核磁共振检查室。另外，怀孕不到3个月的孕妇，最好也不要做核磁共振检查。
血管造影的原理是向血管注入造影剂
由于造影剂密度大
X射线无法穿过
因此血管及血管的供血区域会显示为高密度影象
而MRI是核磁共振成象的简称
其原理是利用质子或中子数不为双数的原子核在磁场中发生偏转的原理成象
在人体成象中利用的是水分子
通过处理核磁共振前后能量的变化而成象
简单的说
血管造影成象的原理是利用造影剂在组织内造成的密度差异而成象
而MRI则是利用组织中水分子的分布情况而成象
两者有着本质上的差别
效果上看
MRI对小血管及小血管的供血区域成象的能力优于血管造影
其成象更清晰
而且对组织无损伤
但是在操作上限制较多
不能将金属物品带入核磁共振机房
尤其当病人体内有诸如心脏起搏器之类的东西时是不允许进行MRI的
费用上看
核磁共振价格比血管造影昂贵
但成象要优于血管造影
血管造影是指打照影剂后再做CT或者MRI，分别是CT血管造影，核磁共振。 血管造影是病灶显影，更好的显示它的血供，对肿瘤和血管瘤很有意义。 颅脑做MRI看得更加清楚些，是否加做血管照影看情况而定。
血管造影需要导管将造影剂注入椎动脉和颈内动脉。
ct 和核磁共振 只要像静脉输液一样 将造影剂打到静脉里面就可以血管显影。当然后者的精准程度不如前者。
这个还是听医生的吧，造影比较直观，核磁有核磁的优势，各有所长
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