linac 发表于 2015-11-23 20:20:10

MRI SEQUENCES-核磁共振序列

本帖最后由 linac 于 2015-11-23 20:25 编辑

CHAPTER FIVE MRI SEQUENCES

An MRI sequence is an ordered combination of RF and gradient pulses designed to acquire the data to form the image. In this chapter I will describe the basic gradient echo, spin echo and inversion recovery sequences used in MRI.
ThedatatocreateanMRimageisobtainedinaseriesofsteps.Firstthetissue magnetisation is excited using an RF pulse in the presence of a slice select gradient. Theothertwoessentialelementsofthesequencearephaseencodingandfrequency encoding/readout,whicharerequiredtospatiallylocalisetheprotonsintheothertwo dimensions. Finally, after the data has been collected, the process is repeated for a series
of phase encoding steps.
TheMRIsequenceparametersarechosentobestsuittheparticularclinicalapplication. The parameters affecting soft tissue contrast are described, and advanced sequences such as STIR, FLAIR, FISP, and FLASH are briefly introduced at the end of the chapter.
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江西魏工 发表于 2016-5-13 18:50:41

好贴

medphysics 发表于 2016-5-16 15:32:27

goooood 顶起

13636600011 发表于 2016-5-16 16:06:14

好文章，值得学习，顶起来

medimagedev 发表于 2016-5-16 20:29:27

先看看先。。。

medinfo 发表于 2016-5-18 22:57:23

这个要学习下，

biochemistry 发表于 2016-5-20 12:02:03

初学者，学习，谢谢

13636600006 发表于 2016-5-20 19:57:28

留个脚印。。。。。。

RTphysics 发表于 2016-5-22 10:01:52

高手，厉害，向你学习。
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