Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Enhanced 3D-printed holographic acoustic lens for aberration correction
  of single-element transcranial focused ultrasound   The correction of the aberration of transcranial focused ultrasounds is a
relevant issue for enhancing various non-invasive medical treatments. Emission
through multi-element phased arrays has been the most widely accepted method to
reduce aberrations in recent years; however, a new disruptive technology, based
on 3D printed acoustic lenses, has recently been proposed with lower cost and
comparable accuracy. The number and size of transducers in phased array
configurations was a bottleneck limiting the focusing accuracy, but once the
submillimeter precision of the latest generation 3D printers has overcome this
limitation, the challenge is now to improve the accuracy of the numerical
simulations needed to design the lens. This study introduces and evaluates two
improvements to the numerical model applied in previous works that proposed 3D
lenses, which consist in the direct calculation of the phase pattern from the
propagation of oscillating magnitudes in complex form, and in the introduction
of the absorption phenomenon into the set of equations that describe the
dynamics of the wave in both fluid and solid media. Numerical experiments are
performed analysing the quality of the aberrated-corrected focus in different
configurations. The results obtained show that the inclusion of absorption
significantly improves focusing, especially where the thickness of the skull is
more irregular.

15
The categories of this paper are: nucl-ex
13
The categories of this paper are: quant-ph
25
The categories of this paper are: patt-sol
20
The categories of this paper are: acc-phys
16
The categories of this paper are: stat
23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
12
The categories of this paper are: nucl-th
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
5
The categories of this paper are: gr-qc
37
The categories of this paper are: supr-con
0
The categories of this paper are: hep-ph
27
The categories of this paper are: comp-gas
19
The categories of this paper are: eess