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 studies included sagittal SPAIR sequence (TR/TE, 2538 ms/70 ms; TI, 110 ms; echo train length, 19; FOV, 280 mm; matrix, 320x218; NEX, 1; acquisition time, 1:33 min; slice thickness/gap, 4 mm/0.4 mm) and T2 Dixon sequence (TR/TE, 2208 ms/10 ms; echo train length, 22; FOV, 283 mm; matrix, 380x262; NEX, 1; acquisition time, 2:20 min; slice thickness/gap, 4 mm/0.4 mm).
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).
In a CPMG echo train acquired to investigate the transverse NMR relaxation, the rate of signal decrease shortly after the signal excitation is larger than at later times.
As shown in Figure 2, the FLAIR version of low SAR FSE sequence with long echo train (80-100) and low refocusing flip angles produces similar DBS appearance and is useful for imaging of infections and other complications.
Publishing, 2007) and Echo Train (Salt Publishing, 2010).
Parameters for T1WI were as follows : SE sequence, acquisition time; 4min48sec, repetition time(TR) msec/echo time(TE) msec; 500/12.6, Echo Train Length(ETL);1, number of phase/frequency encode (PP/FE); 512,512, Flip Angle(FA); 90deg, slice thickness; 3mm with 0.3mm spacing, acquisition matrix(Mx); 512*512, FOV; 22x22 cm.
If 10 lines of k-space (an "echo train" of 10) are filled during this time (eg, at 10, 20, and up to 100 msec), the sequence can be completed 10 times as quickly.
FSE has the ability to incorporate extended echo train length (ETL), which increases the number of echoes produced per repetition time.
Certain imaging parameters were held constant during the study for CSE, (field of view, 100A-100 mm; number of acquisition,1; slice thickness,4mm; percentage sampling, 100; pixel per mm resolution, 1.280), 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.