SENSE法の頭部領域への応用に関する検討

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Sensitivity encoding (SENSE) is a technique that the uses multiple receiver coils to reduce scan time. In the present study, we investigated the advantages and disadvantages of the SENSE sequence for the brain examination. We also tried to fine the problems of SENSE imaging and the methods for avoiding it. Experiments were performed on a 1.5 T MR machine (Philips). A synergy coil of 2 ele- ments was used for the examination. In SENSE sequence, phase encoding step was reduced to 50% (reduction factor of 2). In comparison with the image using standard birdcage head coil (non-SENSE), SENSE image revealed the remarkable lowering of the visual signal to noise ratio in Tl weighed image, but not in T2 weighed image. In MR angiography (MRA), there was no difference in blood vessel delineation ability by comparing the SENSE image with the non-SENSE image, but the acquisition time was reduced in SENSE technique. The back folding artifact of the high signal appeared in the SENSE image, when the overlap over the number of the coil was made by the error of setting of the imaging range. This artifact can be avoided by enlarging the field of view. In the sequence in which the subcutaneous fat became a high signal, the cut-line artifact of arc and low signal appeared in SENSE image. In the brain examination, the SENSE technique is indicated especially in MRA, functional MRI and perfusion MRI due to its improvement in time resolution and high spatial resolution
日本医療機器学会の論文
2004-01-01

SENSE法の頭部領域への応用に関する検討

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