| 摘要 |
<p>The magnetic resonance activity of a region of a volume is imaged using a time varying gradient whose integral provides a constant velocity spiral in the spatial frequency domain. To provide high fidelity for relatively low values of T2, high SNR for relatively high values, and a T2 sensitive image, the spiral is retraced back to the origin. The gradient requirements are minimized using a sequence of interleaved spirals using separate excitations. For further time reduction, only half the spatial frequency domain can be scanned, using inversion excitations to reduce the effects of inhomogeneity.</p> |
