Simultaneous T(1) and B(1) (+) mapping using reference region variable flip angle imaging.
Simultaneous T(1) and B(1) (+) mapping using reference region variable flip angle imaging.
复制标题
使用参考区域可变翻转角成像同时进行 T(1) 和 B(1) ( ) 映射。
DOI：
10.1002/mrm.24904
复制
发表时间：
2013
影响因子：
3.3
通讯作者：
Hargreaves,BrianA
中科院分区：
文献类型：
--
作者：
Sung,Kyunghyun;Saranathan,Manojkumar;Daniel,BruceL;Hargreaves,BrianA
PurposeTo提出一种新的方法，可以同时和有效地测量T1和B1+地图使用参考区域可变翻转角（RR-VFA）imaging.MethodsAssuming T1弛豫时间在参考区域，如脂肪是很好的特点，和参考区域充分覆盖平滑变化的B1+场的不均匀性，B1+地图可以从VFA图像测量，传统上用于T1测量。使用两点狄克逊采集的纯脂肪图像计算B1+图，并在3 T下对22名乳腺MRI患者的B1+图与使用双角法（DAM）的B1+图进行比较。此外，高空间分辨率的VFA图像被收购，以显示T1测量和没有RR-VFA B1+校正在6 patients.ResultsRR-VFA是能够产生可靠的B1+地图，类似于那些使用传统的DAM。这种同时的T1和B1+映射也可用于减少T1估计误差，其中T1映射具有更均匀的纤维腺体组织T1和更好地描绘乳腺肿块的异质性T1.ConclusionA new method that can measure both T1 and B1+maps based on狄克逊VFA images is described，providing improved T1 quantification with no scan time penalty.Magn Reson Med，70：954-961，2013.© 2013威利期刊公司.
PurposeTo present a new method that can simultaneously and efficiently measure T1and B1+maps using reference region variable flip angle (RR‐VFA) imaging.MethodsAssuming T1relaxation time in a reference region such as fat is well characterized, and the reference region sufficiently covers smoothly varying B1+field inhomogeneity, B1+maps can be measured from VFA images, conventionally used for T1measurements. Fat‐only images from two‐point Dixon acquisitions were used to compute B1+maps, and the B1+maps were compared with ones using the double‐angle method (DAM) in 22 breast MRI patients at 3T. Additionally, high spatial resolution VFA images were acquired to show T1measurements with and without the RR‐VFA B1+correction in six patients.ResultsRR‐VFA is able to generate reliable B1+maps, similar to those using the conventional DAM. This simultaneous T1and B1+mapping can also be used to reduce T1estimation errors, where T1maps have more uniform fibroglandular tissue T1and better depiction of heterogeneous T1of breast masses.ConclusionA new method that can measure both T1and B1+maps based on Dixon VFA images is described, offering improved T1quantification with no scan time penalty.Magn Reson Med, 70:954–961, 2013. © 2013 Wiley Periodicals, Inc.