Propeller imaging is a sequence that is useful for dynamic studies where a continuous set of images are acquired in time. Only a fraction of k-space is acquired for each frame. The sequence relies on the fact that most of the information in k-space is in the center of k-space. Each acquisition covers a rectangular portion of k-space passing through the center of k-space. This rectangular region is said to be the propeller. The acquisition path is similar to that of the echo-planar sequence. After each frame is acquired, the angle of the acquisition is incremented and the next frame acquired. This procedure is continued throughout the dynamic study. Each frame acquires the center portion of k-space. The Outer portions of k-space are updated each cycle of the propeller through k-space.
Propeller Imaging
Propeller imaging is a sequence that is useful for dynamic studies where a continuous set of images are acquired in time. Only a fraction of k-space is acquired for each frame. The sequence relies on the fact that most of the information in k-space is in the center of k-space. Each acquisition covers a rectangular portion of k-space passing through the center of k-space. This rectangular region is said to be the propeller. The acquisition path is similar to that of the echo-planar sequence. After each frame is acquired, the angle of the acquisition is incremented and the next frame acquired. This procedure is continued throughout the dynamic study. Each frame acquires the center portion of k-space. The Outer portions of k-space are updated each cycle of the propeller through k-space.
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