Pulse sequence [T.sub.1] -SE [T.sub.2] -SE Image conditions [T.sub.R] (ms) 300 600 [T.sub.R] (ms) 18 250 Flip angle 90[degrees] 90[degrees] Field of view (cm) 26 26 Section thickness (mm) 6 6 Imaging plane Sagittal Axial Pulse sequence [T.sub.1]-FSE [T.sub.1]-FSE Image conditions [T.sub.R] (ms) 4430 6100 [T.sub.R] (ms) 120 125 Flip angle 90[degrees] 90[degrees] Field of view (cm) 26 26 Section thickness (mm) 6 6 Imaging plane Sagittal Coronal [T.sub.1]-SE: [T.sub.1]-weighted spin echo; [T.sub.2]-SE: [T.sub.2]-weighted spin echo; [T.sub.1]-FSE: [T.sub.1]-weighted fast spin echo; [T.sub.2]-FSE: [T.sub.2] weighted fast spin echo; [T.sub.R]: recovery time; [T.sub.E]: echo time
Based on differences in their magnetization, specific MR sequences that vary the TR (repetition time) and the TE (echo time
) can greatly alter the contrast of both fat and water.
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The scan parameters of the single breath-hold mDIXON-Quant were as follows: repetition time, 9.1 ms; echo time
1, 1.33 Vms; 6 echoes with delta echo time
, 1.3 ms; field of view, 180x140x90 mm; flip angle, 3[degrees]; resolution, 2.5x2.5x3.0 mm; sensitivity encoding, 2; number of signal averages, 2; and scan time, 12.5 s.
Dual inversion recovery, ultrashort echo time
(DIR UTE) imaging: Creating high contrast for short-T(2) species.
Experimental variations in the imaging parameters were performed in echo time
and repetition time.
A more moderate B value (between 400 and 500) is chosen to maintain a short echo time
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Parameters include a long echo time
(TE) of approximately 140 msec and a long TR of approximately 10,000 msec or more to provide high sensitivity to T2 differences. The TR selected is three to four times longer than the T1 value of cerebral spinal fluid to effectively nullify the CSF signal.
By strategically acquiring images at specific echo time
(TE) values, two separate images can be acquired in which water and fat signals are located in-phase and out-of-phase, respectively.