Gurney Paul T, Hargreaves Brian A, Nishimura Dwight G
Magnetic Resonance Systems Research Laboratory, Dept. of Electrical Engineering, Stanford University, Stanford, California 94305-9510, USA.
Magn Reson Med. 2006 Mar;55(3):575-82. doi: 10.1002/mrm.20796.
The 3D Cones k-space trajectory has many desirable properties for rapid and ultra-short echo time magnetic resonance imaging. An algorithm is presented that generates the 3D Cones gradient waveforms given a desired field of view and resolution. The algorithm enables a favorable trade-off between increases in readout time and decreases in the total number of required readouts. The resulting trajectory is very signal-to-noise ratio (SNR) efficient and has excellent aliasing properties. A rapid high-resolution ultra-short echo time imaging sequence is used to compare the 3D Cones trajectory to 3D projection reconstruction (3DPR) sampling schemes. For equivalent scan times, the 3D Cones trajectory has better SNR performance and fewer aliasing artifacts as compared to the 3DPR trajectory.
对于快速和超短回波时间磁共振成像而言，3D 锥体 k 空间轨迹具有许多理想特性。本文提出了一种算法，该算法在给定所需视野和分辨率的情况下生成 3D 锥体梯度波形。该算法能够在增加读出时间与减少所需读出总数之间实现良好的权衡。所得轨迹具有非常高的信噪比（SNR）效率，并且具有出色的混叠特性。使用快速高分辨率超短回波时间成像序列将 3D 锥体轨迹与 3D 投影重建（3DPR）采样方案进行比较。在等效扫描时间下，与 3DPR 轨迹相比，3D 锥体轨迹具有更好的 SNR 性能和更少的混叠伪影。
