Abstract #0719
Time efficient and robust perfusion measurement using Walsh-reordered time encoded pCASL
Federico von Samson-Himmelstjerna 1 , Jan Sobesky 2 , and Matthias Gnther 1
1
Fraunhofer MEVIS, Bremen, Bremen, Germany,
2
Center
for Stroke Research (CSB), Charit University Medicine
Berlin, Berlin, Germany
Time encoded (a.k.a Hadamard) pseudo continuous ASL
decodes N-1 time steps from N image acquisitions. All N
images are necessary for correct decoding. This means,
that corrupted images, e.g. by motion, can lead to
erroneous decoding and, thus, complete loss of data. To
overcome this limitation a Walsh-ordered and extended
Hadamard matrix is proposed for encoding. It allows the
reconstruction of perfusion data from the second image
acquisition on and a time resolution that increases with
the number of acquisitions. This renders the technique
robust against complete loss of data e.g. by motion of
agitated patients in the clinical setup.
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