Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Accelerated Reconstruction of Perfusion-Weighted MRI Enforcing Jointly
  Local and Nonlocal Spatio-temporal Constraints   Perfusion-weighted magnetic resonance imaging (MRI) is an imaging technique
that allows one to measure tissue perfusion in an organ of interest through the
injection of an intravascular paramagnetic contrast agent (CA). Due to a
preference for high temporal and spatial resolution in many applications, this
modality could significantly benefit from accelerated data acquisitions. In
this paper, we specifically address the problem of reconstructing perfusion MR
image series from a subset of k-space data. Our proposed approach is motivated
by the observation that temporal variations (dynamics) in perfusion imaging
often exhibit correlation across different spatial scales. Hence, we propose a
model that jointly penalizes the voxel-wise deviations in temporal gradient
images obtained based on a baseline, and the patch-wise dissimilarities between
the spatio-temporal neighborhoods of entire image sequence. We validate our
method on dynamic susceptibility contrast (DSC)-MRI and dynamic
contrast-enhanced (DCE)-MRI brain perfusion datasets acquired from 10 tumor
patients in total. We provide extensive analysis of reconstruction performance
and perfusion parameter estimation in comparison to state-of-the-art
reconstruction methods. Experimental results on clinical datasets demonstrate
that our reconstruction model can potentially achieve up to 8-fold acceleration
by enabling accurate estimation of perfusion parameters while preserving
spatial image details and reconstructing the complete perfusion time-intensity
curves (TICs).

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The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin
14
The categories of this paper are: math-ph
2
The categories of this paper are: math
15
The categories of this paper are: nucl-ex
28
The categories of this paper are: alg-geom
13
The categories of this paper are: quant-ph
24
The categories of this paper are: dg-ga
37
The categories of this paper are: supr-con
36
The categories of this paper are: cmp-lg
10
The categories of this paper are: q-bio
35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex
6
The categories of this paper are: astro-ph
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an