Study of CT Images Processing with the Implementation of MLEM Algorithm using CUDA on NVIDIA’S GPU Framework

 

• T. A. Valencia-Pérez
  Faculty of Physical Sciences Mathematics Benemérita Universidad Autónoma de Puebla, Avenida San Claudio y 18 Sur, Colonia San Manuel, Building FM2-203, Ciudad Universitaria, C.P. 72570, Puebla, Mexico
• J. M. Hernández-López
  Faculty of Physical Sciences Mathematics Benemérita Universidad Autónoma de Puebla, Avenida San Claudio y 18 Sur, Colonia San Manuel, Building FM2-203, Ciudad Universitaria, C.P. 72570, Puebla, Mexico
• E. Moreno-Barbosa
  Faculty of Physical Sciences Mathematics Benemérita Universidad Autónoma de Puebla, Avenida San Claudio y 18 Sur, Colonia San Manuel, Building FM2-203, Ciudad Universitaria, C.P. 72570, Puebla, Mexico
• B. de Celis-Alonso
  Faculty of Physical Sciences Mathematics Benemérita Universidad Autónoma de Puebla, Avenida San Claudio y 18 Sur, Colonia San Manuel, Building FM2-203, Ciudad Universitaria, C.P. 72570, Puebla, Mexico

DOI: https://doi.org/10.15415/jnp.2020.72021

Keywords: Computed tomography, Algorithms, GPU, Reconstruction, Image quality

Abstract

In medicine, the acquisition process in Computed Tomography Images (CT) is obtained by a reconstruction algorithm. The classical method for image reconstruction is the Filtered Back Projection (FBP). This method is fast and simple but does not use any statistical information about the measurements. The appearance of artifacts and its low spatial resolution in reconstructed images must be considered. Furthermore, the FBP requires of optimal conditions of the projections and complete sets of data. In this paper a methodology to accelerate acquisition process for CT based on the Maximum Likelihood Estimation Method (MLEM) algorithm is presented. This statistical iterative reconstruction algorithm uses a GPU Programming Paradigms and was compared with sequential algorithms in which the reconstruction time was reduced by up to 3 orders of magnitude while preserving image quality. Furthermore, they showed a good performance when compared with reconstruction methods provided by commercial software. The system, which would consist exclusively of a commercial laptop and GPU could be used as a fast, portable, simple and cheap image reconstruction platform in the future.

 

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Issue

Vol 7 No 2 (2020): Special Issue

 

How to Cite

T. A. Valencia-Pérez; J. M. Hernández-López; E. Moreno-Barbosa; B. de Celis-Alonso. Study of CT Images Processing With the Implementation of MLEM Algorithm Using CUDA on NVIDIA’S GPU Framework. J. Nucl. Phy. Mat. Sci. Rad. A. 2020, 7, 165-171.

Characterizing a Mini Gamma Detector

 

• E. Márquez-Quintos
  Faculty of Mathematical Physical Sciences, Benemérita Universidad Autónoma de Puebla, C.P. 72570, Puebla, Mexico
• E. Moreno-Barbosa
  Faculty of Mathematical Physical Sciences, Benemérita Universidad Autónoma de Puebla, C.P. 72570, Puebla, Mexico
• J. E. Espinosa
  Faculty of Mathematical Physical Sciences, Benemérita Universidad Autónoma de Puebla, C.P. 72570, Puebla, Mexico
• Benito de Celis Alonso
  Faculty of Mathematical Physical Sciences, Benemérita Universidad Autónoma de Puebla, C.P. 72570, Puebla, Mexico
• Margarita Amaro Aranda
  Faculty of Electronics Sciences, Benemérita Universidad Autónoma de Puebla, C.P. 72570, Puebla, Mexico
• R. Palomino Merino
  Faculty of Mathematical Physical Sciences, Benemérita Universidad Autónoma de Puebla, C.P. 72570, Puebla, Mexico

DOI: https://doi.org/10.15415/jnp.2020.72020

Keywords: Gamma ray, Crystal Scintillator, Spectrophotometer, Calibration

Abstract

There are several types of gamma radiation detectors, which have different characteristics depending on its use. We designed and instrumented a gamma detector for low energies of a small and portable size to obtain spectrum from radioactive sources and from that analyze each spectrum. This instrument basically consists of a scintillator crystal coupled to a SiPM this in turn coupled to a PCB card designed with capacitors and resistors for a better signal, a voltage source of 29 volts. For signal acquisition the system must be connected to an oscilloscope this in turn is controlled by a script developed in Python. For the calibration radioactive isotopes with the same dimensions were used, caesium-137 (Cs-137), cobalto-60 (Co-60), sodium-22 (Na-22) and manganese-54 (Mn-54) as gamma ray emission.

 

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Issue

Vol 7 No 2 (2020): Special Issue 

 

 

How to Cite

E. Márquez-Quintos; E. Moreno-Barbosa; J. E. Espinosa; Benito de Celis Alonso; Margarita Amaro Aranda; R. Palomino Merino. Characterizing a Mini Gamma Detector. J. Nucl. Phy. Mat. Sci. Rad. A. 2020, 7, 159-163.

 

 

Analysis of DDM into Gamma Radiation

 

• C. Arellano-Celiz
  Faculty of Mathematical Physical Sciences, Benemérita Universidad Autónoma de Puebla, Apdo. Postal 1152, Puebla, Pue.-72000, Mexico
• A. Avilez-López
  Faculty of Mathematical Physical Sciences, Benemérita Universidad Autónoma de Puebla, Apdo. Postal 1152, Puebla, Pue.-72000, Mexico
• J. E. Barradas-Guevara
  Faculty of Mathematical Physical Sciences, Benemérita Universidad Autónoma de Puebla, Apdo. Postal 1152, Puebla, Pue.-72000, Mexico
• O. Félix-Beltrán
  Faculty of Electronics Sciences, Benemérita Universidad Autónoma de Puebla, Apdo. Postal 542, Puebla, Pue.-72000, Mexico
• F. González-Canales
  Faculty of Electronics Sciences, Benemérita Universidad Autónoma de Puebla, Apdo. Postal 542, Puebla, Pue.-72000, Mexico

DOI: https://doi.org/10.15415/jnp.2020.72019

Keywords: Dark matter, Dipolar dark matter, WIMP, Relic density

Abstract

We are interested in the purpose of a dipolar fermionic particle as a viable candidate of Dark Matter (DDM). Then, we study the annihilation of dark matter into photons, considering it as a neutral particle with non-vanishing magnetic (M) and electric (D) dipolar moments. The total annihilation cross section σ(χ → γ) is computed by starting from a general form of coupling χγ in a framework beyond to Standard Model (BSM). We found that candidates with O(m_χ )∽10²GeV, D≈10⁻¹⁶ e cm are required in order to satisfy the current cosmic relic density.

 

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Issue

Vol 7 No 2 (2020): Special Issue

 

How to Cite

C. Arellano-Celiz; A. Avilez-López; J. E. Barradas-Guevara; O. Félix-Beltrán; F. González-Canales. Analysis of DDM into Gamma Radiation. J. Nucl. Phy. Mat. Sci. Rad. A. 2020, 7, 153-157.

Preliminary Measurements of Be-10/Be-7 Ratio in Rainwater for Atmospheric Transport Analysis

 

• K. de los Ríos
  Physics Institute, National Autonomous University of Mexico. P.O. Box 20-364, Mexico City, Mexico
• C. Méndez-García
  CONACyT Lecturers - Physics Institute, National Autonomous University of Mexico. P.O. Box 20-364, Mexico City, Mexico
• L. Acosta
  Physics Institute, National Autonomous University of Mexico. P.O. Box 20-364, Mexico City, Mexico
• R. García-Martínez
  Atmosphere Science Center, National Autonomous University of Mexico, Mexico City-04510, Mexico
• M. A. Martínez-Carrillo
  Science Faculty, National Autonomous University of Mexico, 04510 Mexico City, Mexico
• M. E. Ortiz
  Physics Institute, National Autonomous University of Mexico. P.O. Box 20-364, Mexico City, Mexico

DOI: https://doi.org/10.15415/jnp.2020.72018

Keywords: Rainwater, Beryllium-7, Beryllium-10, AMS, HP-Ge

Abstract

The meteoric cosmogenic beryllium has been used as an essential geophysical tracer in the analysis of atmospheric flows and erosion soils since 1960. The first measurements Be-7 and Be-10 concentrations in rainwater from Mexico, have been carried out by using gamma decay spectroscopy and AMS techniques, respectively for each isotope. With this it was possible to report a preliminar value for the Be-10/Be-7 isotopic ratio in such environmental samples. The present work described preliminary results related to rainwater collected at mountain and metropolitan areas. Results are compared with predictions and previous measurements for both radioisotopes, observing a very sensible behavior particularly for the case of Be-7 activities.

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Issue

Vol 7 No 2 (2020): Special Issue

 

How to Cite

K. de los Ríos; C. Méndez-García; L. Acosta; R. García-Martínez; M. A. Martínez-Carrillo; M. E. Ortiz. Preliminary Measurements of Be-10/Be-7 Ratio in Rainwater for Atmospheric Transport Analysis. J. Nucl. Phy. Mat. Sci. Rad. A. 2020, 7, 145-151.

Behavior of Poly-A onto Kaolin

 

• María Guadalupe Torres-Duque
  Faculty of Higher Education Iztacala, National Autonomous University of Mexico. Avenida de los Barrios Number 1, Colonia Los Reyes Iztacala, Tlalnepantla, State of Mexico
• Claudia Camargo-Raya
  Institute of Nuclear Sciences, National Autonomous University of Mexico. Circuito Exterior s/n, Ciudad Universitaria, Coyoacán, Mexico City
• Alicia Negrón-Mendoza
  Institute of Nuclear Sciences, National Autonomous University of Mexico. Circuito Exterior s/n, Ciudad Universitaria, Coyoacán, Mexico City
• Sergio Ramos-Bernal
  Institute of Nuclear Sciences, National Autonomous University of Mexico. Circuito Exterior s/n, Ciudad Universitaria, Coyoacán, Mexico City

DOI: https://doi.org/10.15415/jnp.2020.72017

Keywords: Poly-A, Clays, Kaolin, Chemical evolution

Abstract

A combination of geochemical variables is necessary to explain the origin of life on Earth. Thus, in this work the sorption of Poly-A on a clay mineral (kaolinite) was studied to get an insight about the sorption capacity at different times and pH values, as well as to confirm the capabilities of the clay to protect the sorbate from an external source of ionizing radiation. Poly-A presented a high percentage of sorption in the clay, especially in acidic environments, and this percentage sharply decrease in alkaline media. On the other hand, Poly-A’s recovery was higher in the system with clay, confirming its protection role.

 

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Issue

Vol 7 No 2 (2020): Special Issue 

 

 

How to Cite

María Guadalupe Torres-Duque; Claudia Camargo-Raya; Alicia Negrón-Mendoza; Sergio Ramos-Bernal. Behavior of Poly-A onto Kaolin. J. Nucl. Phy. Mat. Sci. Rad. A. 2020, 7, 139-143.