MRI Research Centre, Department of Physics, University of New Brunswick, Fredericton, Canada.
J Magn Reson. 2012 Feb;215:109-14. doi: 10.1016/j.jmr.2011.12.019. Epub 2012 Jan 5.
A CPMG pulse sequence incorporated with a DANTE-Z slice selection scheme for measuring spatially-resolved T(2) distributions has been presented. The DANTE-Z pulse train with sinc-modulated pulses selects a single, quasi-rectangular slice of less than 0.8 cm wide at an arbitrary position over a 6-cm long sample. The measured T(2) distributions are of almost the same quality as regular (bulk) CPMG measurements, with the lower T(2) limit being as good as c.a. 0.5 ms. The sequence can be found useful as a supplement or alternative to MRI-based techniques for T(2) mapping in short relaxation time samples (water-saturated rocks, building materials, wood, food products, rubbers, etc.), particularly when T(2) is required to be measured at only few positions along the sample and the resolution of ~1 cm is acceptable.
一种结合了 DANTE-Z 切片选择方案的 CPMG 脉冲序列，用于测量空间分辨 T(2)分布，已经被提出。DANTE-Z 脉冲串与 sinc 调制脉冲一起，在 6 厘米长的样品上的任意位置选择不到 0.8 厘米宽的单个准矩形切片。测量的 T(2)分布与常规（体）CPMG 测量具有几乎相同的质量，较低的 T(2)限制好于 c.a. 0.5ms。该序列可作为基于 MRI 的 T(2)映射技术的补充或替代方法，用于短弛豫时间样品（水饱和岩石、建筑材料、木材、食品、橡胶等），特别是当仅需要在样品的少数几个位置测量 T(2)并且可以接受 ~1cm 的分辨率时。
