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MAGMA. 2008 Sep;21(5):307-15. doi: 10.1007/s10334-008-0131-5. Epub 2008 Jul 31.

Flow-compensated self-gating.

Author information

1
Siemens Medical Solutions, Erlangen, Germany.

Abstract

OBJECTIVE:

Self-gating (SG) is a method to record cardiac movement during MR imaging. It uses information from an additional short, non-spatially encoded data acquisition. This usually lengthens TE and increases the sensitivity to flow artifacts. A new flow compensation scheme optimized for self-gating sequences is introduced that has very little or no time penalty over self-gating sequences without flow compensation.

MATERIALS AND METHODS:

Three variants of a self-gated 2D spoiled gradient echo or fast low angle shot (FLASH) sequence were implemented: without (noFC), with a conventional, serial (cFC), and with a new, time-efficient flow compensation (sFC). In experiments on volunteers and small animals, the sequence variants were compared with regard to the SG signal and the flow artifacts in the images.

RESULTS:

Both cFC and sFC reduce flow artifacts in cardiac images. The SG signal of the sFC is more sensitive to physiological motion, so that a cardiac trigger can be extracted more precisely as in cFC. In a typical setting for small animal imaging, sFC technique reduces the echo/repetition time over cFC by about 23%/14%.

CONCLUSION:

The time-efficient sFC technique provides flow-compensated images with cardiac triggering in both volunteers and small animals.

PMID:
18668271
DOI:
10.1007/s10334-008-0131-5
[Indexed for MEDLINE]

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