echo train

echo train

A series of 180° radiofrequency rephasing pulses and their corresponding echoes for a fast spin echo (FSE) pulse sequence.

echo train

(ĕk'ō trān)
Series of 180-degree rephasing pulse and echoes in a fast-spin echo pulse sequence used in magnetic resonance imaging.
References in periodicals archive ?
Imaging parameters which were held constant during the study for CSE, FSE, FLAIR in T1-weighted study (field of view, 100x100 mm; number of acquisitions, 1; slice thickness, 4 mm), FLAIR (inversion time, 400 ms; echo train length, 7) and FSE (echo train length, 12).
The transverse relaxation was measured on acquisition of an echo train with Carr-PurcellMeiboom-Gill (CPMG) pulse sequences.
Publishing, 2007) and Echo Train (Salt Publishing, 2010).
6, Echo Train Length(ETL);1, number of phase/frequency encode (PP/FE); 512,512, Flip Angle(FA); 90deg, slice thickness; 3mm with 0.
Now it might be asked that if the length of the echo train determines the speed of the sequence, why not always use the longest echo train possible?
FSE has the ability to incorporate extended echo train length (ETL), which increases the number of echoes produced per repetition time.
280), FLAIR(inversion time, 860 ms; echo train length, 5) and FSE (echo train length, 7).
13,14) Acquiring this sequence as an echo train permits shortening the sequence from 15 min to 4 to 5 min.
THE steam engine star of a famous British film will be back in Liverpool after 44 years to haul a special ECHO train.
The effective TE determines the echo train length (ETL) based on echo spacing (ESP).