Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Reduced effective scanning time in SPECT due to OSEM accelerated
  reconstruction   We study the increase of image noise which can be observed in images
reconstructed with the OSEM algorithm. We argue that the excessive noise is
equivalent to shortening scanning time by a factor of 2 or more at high number
of subsets (acceleration factors). Therefore, by keeping the number of OSEM
subsets low one can significantly reduce image noise, which in turn is
equivalent to increasing scanning time or radiation dose. While the OSEM
remains a very useful reconstruction method enabling substantial reduction of
reconstruction times, it should be used with caution. In particular, high
numbers of subsets should be avoided if possible. Whenever the available
computing power allows achieving acceptable reconstruction times at lower
number of subsets, one can consider reducing scanning time or injected dose,
while maintaining the image quality of standard scans reconstructed with higher
OSEM acceleration. The recommended maximal "safe" number of subsets, which does
not lead to significant increase of image noise, is about 5.

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The categories of this paper are: stat
32
The categories of this paper are: atom-ph
8
The categories of this paper are: hep-ex
25
The categories of this paper are: patt-sol
35
The categories of this paper are: mtrl-th
34
The categories of this paper are: chem-ph
4
The categories of this paper are: cond-mat
1
The categories of this paper are: cs
14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
13
The categories of this paper are: quant-ph
15
The categories of this paper are: nucl-ex
9
The categories of this paper are: nlin
26
The categories of this paper are: bayes-an
21
The categories of this paper are: adap-org
30
The categories of this paper are: q-alg