Showing posts with label Computed Tomography. Show all posts
Showing posts with label Computed Tomography. Show all posts

Tuesday, 8 September 2020

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
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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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.

Saturday, 16 September 2017

Characterization Of Structures Of Equivalent Tissue With a Pixel Detector

M.C GRADOS LUYANDO* , B. DE CELIS ALONSO, E. MORENO BARBOSA, M.I. MARTÍNEZ HERNÁNDEZ, J.M. HERNÁNDEZ LÓPEZ AND G. TEJEDA MUÑOZ

1 Benemérita Universidad Autónoma de Puebla

*Email: carminagl87@gmail.com

Abstract 
Research using hybrid pixel detectors in medical physics is on the rise. Timepix detectors have arrays of 256 × 256 pixels with a resolution of 55 µm. Here, and by using Timepix counts instead of Hounsfield units, we present a calibration curve of a Timepix detector analog to those used for CT calibration. Experimentation consisted of the characterization of electron density in 10 different kinds of tissue equivalent samples from a CIRS 062M phantom (lung, 3 kinds of bones, fat, breast, muscle, water and air). Radiation of the detector was performed using an orthodontic X-ray machine at 70 KeV and .06 second of tube current with a purpose-built aluminum collimator. Data acquisition was performed at 1 frame per second and taking 3 frames per phantom. We were able to find a curve whose behavior was similar to others already published. This will lead to the verification of the usage of Timepix for identification of different tissues in an organ.


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