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Abstract #4964

Sampling Density-Adaption for Directly Filtered Projection Reconstruction

Armin Michael Nagel1, Frederik Bernd Laun1, Christian Matthies1, Armin Biller2,3, Michael Bock1

1Medical Physics in Radiology, German Cancer Research Center, Heidelberg, Germany; 2Radiology, German Cancer Research Center, Germany; 3Department of Diagnostic and Interventional Radiology, University Hospital Heidelberg, Germany

To minimize ringing artifacts apodization functions are often used. In this work a sampling density weighted apodization (SW) with a Hamming-window was implemented for 3D projection reconstruction trajectories (3DPR). This pulse sequence was compared with two post-acquisition filtered 3DPR-sequences, a conventional 3DPR-sequence and a sampling density adapted sequence (3DPR-UPF). Both, the 3DPR-UPF- and the 3DPR-SW-sampling scheme show a much better performance when compared to a conventional post-acquisition filtered 3DPR-sequence. Comparing the 3DPR-SW- and the post-acquisition filtered 3DPR-UPF-sequence, the SNR-benefits of the SW approach competes against the better artifact-behavior of the post-filtered technique.