By Filippi, De Stefano, Dousset, McGowan
MRI in White subject illnesses of the mind and Spinal Cord.
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Extra info for MRI in White Matter Diseases of the Brain and Spinal Cord
At short TI, all other tissue signals are negative which leads to positive values on magnitude reconstructed images (Fig. 10). Using STIR, better visualization of structures such as the optic nerve can be obtained (Atlas et al. 1988). STIR is not compatible with intravenous contrast. Fig. 10. Short tau inversion recovery (STIR) image (left) is used to suppress signal form the peri-orbital fat. In a non-STIR image (right), the details of the optic nerve cannot be seen due to the strong signal from peri-orbital fat.
In addition, it is important to be able to excite a variety of nuclei with different gyromagnetic ratios, and hence widely different frequencies. In addition to setting the frequency, duration and amplitude of an RF pulse, the low-power transmitter system of an MRI scanner must be capable of adjusting the phase of the pulse. By altering the phase relationship between the RF excitation pulse and the receiver reference signal, it is possible to reduce certain artifacts associated with imperfect ﬂip angles, unwanted spin echoes, receiver imbalances and other effects.
10). Using STIR, better visualization of structures such as the optic nerve can be obtained (Atlas et al. 1988). STIR is not compatible with intravenous contrast. Fig. 10. Short tau inversion recovery (STIR) image (left) is used to suppress signal form the peri-orbital fat. In a non-STIR image (right), the details of the optic nerve cannot be seen due to the strong signal from peri-orbital fat. The inversion time of 170 ms in the STIR image causes the fat to pass through zero or be nulled. The echo time (TE=90 ms) is the same in both images.
MRI in White Matter Diseases of the Brain and Spinal Cord by Filippi, De Stefano, Dousset, McGowan