Schematic diagram of 4D-CTA imaging techniques.

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Presentation transcript:

Schematic diagram of 4D-CTA imaging techniques. Schematic diagram of 4D-CTA imaging techniques. The x-axis represents the time domain. The y-axis represents the z-dimension. The light-gray horizontal bar represents the area that needs to be covered in the z-dimension. A, Shuttle mode: the sinus represents continuous table movement back and forth in the z-axis dimension to provide adequate coverage of the region of interest at multiple points in time. Notice that the temporal resolution is a function of the speed of table movement, typically 2–4 seconds depending on coverage. B, Toggling-table technique: the bars represent table repositioning in the z-axis dimension to provide adequate coverage of the region of interest at multiple points in time. Notice that the temporal resolution is a function of the speed of table repositioning, typically 3–4 seconds. C, Volume scanning: complete coverage of the region of interest (horizontal bar) with 1 gantry rotation. Notice that the temporal resolution is a function of the scanning interval settings because each rotation provides full coverage. Volume CT scanning enables (D) continuous volume scanning. Temporal resolution is limited by the gantry rotation speed. H.G.J. Kortman et al. AJNR Am J Neuroradiol 2015;36:1026-1033 ©2015 by American Society of Neuroradiology