自旋回波序列（SE）使用90°射频脉冲（Radiofrequence Pulse, RF），将纵向磁共振矢量激励而使纵向磁化矢量翻转至横向平面，等待一段时间（TE/2）后，利用180°回波脉冲，将横向磁化矢量重聚，产生回波信号进行采集，而这种回波就叫作自旋回波。自旋回波脉冲序列图见图1。图1，自旋回波脉冲序列（SE Sequence）示意图。...
In an MRI system a diffusion weighted fast spin echo (FSE) pulse sequence is employed to acquire data for producing an image. Each FSE pulse sequence is prefaced by a diffusion weighting pulse sequence, and components of the diffusion weighted spin magnetization that produce image artifacts are ...
DW sequences were obtained using a single shot, multislicespin echoplanar diffusion pulse sequence and a b factor of 0 and 900 s mm−2. asiaandro.com asiaandro.com 使用单脉冲,多片自旋回波平面扩散脉冲序列和0及900 s mm-2的b因子获得弥散加权序列。
The top left inset shows the spin echo pulse sequence. All data are presented as mean ± s.e.m. Source data Full size image To explore the functional form of the probe NV’s decoherence, we plot the negative logarithm of the coherence, \(-\log C(t)\), on a log–log scale,...
c Measurement of the spin coherence time T2 using a spin echo pulse sequence. Solid lines are data fitting with an exponential decay. All experiments are performed with a static magnetic field B ~ 15 mT applied along the c axis. The duration of the laser pulses is 8 μs with ...
3. The method as recited in claim 1 in which a third gradient pulse is applied during the fast spin echo pulse sequence after each rf refocusing pulse and prior to acquiring the corresponding NMR echo signal, and the size of each of said third gradient pulses is substantially the same as ...
The density matrix describing the evolution of a spin system excited by a spin-echo sequence is calculated from the equilibrium state to the acquisition period by taking into account only the first-order quadrupolar interaction. The formation of an echo due to the two satellite transitions is ...
In an MRI system a fast spin echo pulse sequence is employed to acquire data for producing an image. The phase of successive RF refocusing pulses in the sequence is shifted by a sweep factor and an odd echo signal and an even echo signal is acquired for each view. Two k-space data set...
Use of new turbo spin-echo pulse sequences with and without fat suppression in the diagnosis and staging of prostate carcinoma (In German) : Engelhard K, Hollenbach HP, Rieger J, et al. (Roentgenabteilung Krankenhaus Martha-Maria, Stadenstrasse 58, D-90494 Nürnberg, Germany). Fortschr ...
Fast spin-echo imaging of the abdomen during breath-holding: An alternative to RASE and other fast imaging techniquesAbdomen, MR studiesMagnetic resonance, pulse sequencesMagnetic resonance, technologyMagnetic resonance, rapid imagingWe have developed a rapidly acquired T1-weighted spin-echo pulse ...