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. 2017 Jun 9;38(9):1461–1480. doi: 10.1177/0271678X17713434

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© The Author(s) 2017

This article is distributed under the terms of the Creative Commons Attribution 4.0 License (http://www.creativecommons.org/licenses/by/4.0/) which permits any use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Figure 5. — Combined 4D-ASL-angiography and perfusion imaging. (a) A subset of slices are depicted of the perfusion part of the sequence (acquired with a PLD of 1875 ms) as well as maximum intensity projection images of the angiography readout at multiple PLDs. (b) The encoding scheme in which a ‘free-lunch’-like Hadamard encoding matrix is combined with a dual readout approach. The segmented 3D TFEPI readout module consumes approximately 20% of the available ASL-signal, leading to a 20% lower SNR of the perfusion scan as compared to a perfusion only scan. This small drop in SNR was counteracted by slightly decreasing the spatial resolution.