扫描参数的一些问题

 各位老师和同学:

我对扫描参数一直了解不多,最近在写论文时有一些困惑,问题如下:
1. REST的旋转角记录的是标准角,请问标准角是指多少度呢?
2. T1的旋转角记录的是矢状位,这个又是多少度呢?
3. 我们数据的TR是2530(在北师大采的数据),但我看很多研究里面T1的TR是7-8ms,而另一部分则是1000-3000ms,为什么差别这么大呢?

提前感谢!

 1. do you mean flip angle? in resting-state fMRI, we usually use 90 degree. I don't know what's "standard angle".
 2. The flip angle in T1 varies in studies and MRI vendors, for our GE MR 750 system, is 8 degree.
 3. Do you mean TR in T1 image? It also varies in studies and vendors. As long as your image is right, and your MR technicians says so, you can just report it.