Phase-Sensitive IR
If phase-sensitive IR provides more information than magnitude reconstructed IR, why not use it all the time?
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Phase-sensitive IR is somewhat tricky to implement in that the sequence suffers from phase error artifacts and long scanning times. Sources of phase errors include patient-related variations in coil loading and sensitivity, non-centering of the echo in the readout window, and hardware-induced phase shifts. In all cases a phase-correction algorithm must be employed that may involve acquisition of an additional reference image and/or phase map estimation.
Magnitude reconstruction does not require such sophisticated post-processing. Additionally, magnitude reconstruction allows setting of TI for selective nulling of tissues such as fat (STIR) or CSF (FLAIR). Selective nulling techniques are not possible with phase-sensitive IR. |
Failure of phase correction algorithm in phase-corrected IR image.
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References
Hous P, Hasan KM, Sitton CW et al. Phase-sensitive T1 inversion recovery imaging: a time-efficient interleaved technique for improved tissue contrast in neuroimaging. AJNR Am J Neuroradiol 2005; 26:1432-1438.
Hous P, Hasan KM, Sitton CW et al. Phase-sensitive T1 inversion recovery imaging: a time-efficient interleaved technique for improved tissue contrast in neuroimaging. AJNR Am J Neuroradiol 2005; 26:1432-1438.
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