Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Simultaneous estimation of attenuation and structure parameters of
  aggregated red blood cells from backscatter measurements   The analysis of the ultrasonic frequency-dependent backscatter coefficient of
aggregating red blood cells reveals information about blood structural
properties. The difficulty to apply this technique in vivo is due to the
frequency-dependent attenuation caused by intervening tissue layers that
distorts the spectral content of backscattering properties from blood
microstructures. An optimization method is proposed to simultaneously estimate
tissue attenuation and blood structure factor. In an in vitro experiment, the
method gave satisfactory estimates with relative errors below 22% for
attenuations between 0.101 and 0.317 dB/cm/MHz, signal-to-noise ratios>28 dB
and kR<2.7 (k being the wave number and R the aggregate radius).

6
The categories of this paper are: astro-ph
18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci
36
The categories of this paper are: cmp-lg
14
The categories of this paper are: math-ph
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
7
The categories of this paper are: hep-th
24
The categories of this paper are: dg-ga
17
The categories of this paper are: q-fin
1
The categories of this paper are: cs
37
The categories of this paper are: supr-con
15
The categories of this paper are: nucl-ex
21
The categories of this paper are: adap-org
29
The categories of this paper are: funct-an
16
The categories of this paper are: stat