کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5406043 | 1506047 | 2012 | 9 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Rapid spectroscopic velocity quantification using periodically oscillating gradients Rapid spectroscopic velocity quantification using periodically oscillating gradients](/preview/png/5406043.png)
In this work two spectroscopic methods are described which allow rapid flow velocity quantification in the presence of a parabolic velocity distribution. This method requires only a single excitation and is based on flow encoding by periodically oscillating gradients. In the shown spin echo variant additional refocusing pulses correct for field inhomogeneities. A theoretical model is introduced, which describes the course of the derived spectra even in high flow region, where a significant part of the encoded spins leaves the sensitive area of the coil during data acquisition (outflow-effect). It was demonstrated that both methods can quantify flow velocities within the velocity range of 1mm/s up to 36cm/s in the presence of a parabolic flow velocity distribution. The maximum velocity of the parabolic distribution is indicated in this method by a peak in the acquired spectrum from which the velocity could be quantified. Flow velocity quantification by periodically oscillating gradients seems a reasonable and fast alternative to established imaging techniques.
65Highlights⺠This work describes a spectroscopic method for rapid flow quantification. ⺠It is based on continuous flow encoding by alternating e.g. sinusoidal gradient. ⺠Quantification considers flow velocity distribution e.g. laminar flow.
Journal: Journal of Magnetic Resonance - Volume 214, January 2012, Pages 175-183