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.
Keywords