Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A new geometry of scintillating crystals with Strip SiPMs: a PET
  detector with precise position and time determination   Measurement of the Time-of-Flight (TOF) of the 511 keV gammas brings an
important reduction of statistical noise in the PET image, with higher
precision time measurements producing clearer images. Scintillating crystals
are used to convert the 511 keV annihilation photon to an electron of ~511 KeV
energy via the photoelectric effect; it is necessary to determine with
precision the position and time of this conversion within the scintillating
crystal. We propose using an array of crystals cut into a specific geometry
discussed below; these crystals are read out by an array of strip SiPMs. This
technique allows individual time measurements of the first arriving
photo-electrons and to extract the best time resolution using a specific
algorithm. The final result is a precise determination of the 3D position (that
includes the depth of interaction) of the photoelectric interaction and an
improved time measurement.

29
The categories of this paper are: funct-an
27
The categories of this paper are: comp-gas
5
The categories of this paper are: gr-qc
24
The categories of this paper are: dg-ga
15
The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph
1
The categories of this paper are: cs
20
The categories of this paper are: acc-phys
7
The categories of this paper are: hep-th
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
34
The categories of this paper are: chem-ph
12
The categories of this paper are: nucl-th
18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn
8
The categories of this paper are: hep-ex