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Abstract #4166

Imaging latencies for Cartesian and Golden Angle 2D MRI in real-time MR-guided radiotherapy

Pim T.S. Borman1,2, Rob H.N. Tijssen1, Clemens Bos2, Chrit T.W. Moonen2, Bas W. Raaymakers1, and Markus Glitzner1

1Radiotherapy, UMC Utrecht, Utrecht, Netherlands, 2Imaging Division, UMC Utrecht, Utrecht, Netherlands

For tumor tracking it is vital to minimize the latency between the moment of anatomic change and its appearance on the MR image. Apart from the temporal footprint of the acquisition, the readout trajectory itself influences the latency. We explore how the latency is minimized by shifting the collection of the center of k-space to the end of the acquisition. For Cartesian sequences this is achieved by changing the profile order, whereas in golden angle acquisitions a smaller window or k-t filter is able to achieve this.

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