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Title: One dimensional spatial resolution optimization on a hybrid low field MRI-gamma detector

Abstract

Hybrid systems like Positron Emission Tomography/Magnetic Resonance Imaging (PET/MRI) and MRI/gamma camera, offer advantages combining the resolution and contrast capability of MRI with the better contrast and functional information of nuclear medicine techniques. However, the radiation detectors are expensive and need an electronic set-up, which can interfere with the MRI acquisition process or viceversa. In order to improve these drawbacks, in this work it is presented the design of a low field NMR system made up of permanent magnets compatible with a gamma radiation detector based on gel dosimetry. The design is performed using the software FEMM for estimation of the magnetic field, and GEANT4 for the physical process involved in radiation detection and effect of magnetic field. The homogeneity in magnetic field is achieved with an array of NbFeB magnets in a linear configuration with a separation between the magnets, minimizing the effect of Compton back scattering compared with a no-spacing linear configuration. The final magnetic field in the homogeneous zone is ca. 100 mT. In this hybrid proposal, although the gel detector do not have spatial resolution per se, it is possible to obtain a dose profile (1D image) as a function of the position by using amore » collimator array. As a result, the gamma detector system described allows a complete integrated radiation detector within the low field NMR (lfNMR) system. Finally we present the better configuration for the hybrid system considering the collimator parameters such as height, thickness and distance.« less

Authors:
;  [1]
  1. Medical Physics Group, Physics Department, Universidad Nacional de Colombia, Bogotá (Colombia)
Publication Date:
OSTI Identifier:
22608536
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 1753; Journal Issue: 1; Conference: Latin American symposium on nuclear physics and applications, Medellin (Colombia), 30 Nov - 4 Dec 2015; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; BACKSCATTERING; COLLIMATORS; COMPARATIVE EVALUATIONS; DOSIMETRY; EMISSION; GAMMA CAMERAS; GAMMA RADIATION; MAGNETIC FIELDS; NMR IMAGING; NUCLEAR MAGNETIC RESONANCE; NUCLEAR MEDICINE; ONE-DIMENSIONAL CALCULATIONS; OPTIMIZATION; PERMANENT MAGNETS; POSITRON COMPUTED TOMOGRAPHY; POSITRONS; RADIATION DETECTION; RADIATION DETECTORS; SPATIAL RESOLUTION; THICKNESS

Citation Formats

Agulles-Pedrós, L., E-mail: lagullesp@unal.edu.co, and Abril, A., E-mail: ajabrilf@unal.edu.co. One dimensional spatial resolution optimization on a hybrid low field MRI-gamma detector. United States: N. p., 2016. Web. doi:10.1063/1.4955390.
Agulles-Pedrós, L., E-mail: lagullesp@unal.edu.co, & Abril, A., E-mail: ajabrilf@unal.edu.co. One dimensional spatial resolution optimization on a hybrid low field MRI-gamma detector. United States. doi:10.1063/1.4955390.
Agulles-Pedrós, L., E-mail: lagullesp@unal.edu.co, and Abril, A., E-mail: ajabrilf@unal.edu.co. Thu . "One dimensional spatial resolution optimization on a hybrid low field MRI-gamma detector". United States. doi:10.1063/1.4955390.
@article{osti_22608536,
title = {One dimensional spatial resolution optimization on a hybrid low field MRI-gamma detector},
author = {Agulles-Pedrós, L., E-mail: lagullesp@unal.edu.co and Abril, A., E-mail: ajabrilf@unal.edu.co},
abstractNote = {Hybrid systems like Positron Emission Tomography/Magnetic Resonance Imaging (PET/MRI) and MRI/gamma camera, offer advantages combining the resolution and contrast capability of MRI with the better contrast and functional information of nuclear medicine techniques. However, the radiation detectors are expensive and need an electronic set-up, which can interfere with the MRI acquisition process or viceversa. In order to improve these drawbacks, in this work it is presented the design of a low field NMR system made up of permanent magnets compatible with a gamma radiation detector based on gel dosimetry. The design is performed using the software FEMM for estimation of the magnetic field, and GEANT4 for the physical process involved in radiation detection and effect of magnetic field. The homogeneity in magnetic field is achieved with an array of NbFeB magnets in a linear configuration with a separation between the magnets, minimizing the effect of Compton back scattering compared with a no-spacing linear configuration. The final magnetic field in the homogeneous zone is ca. 100 mT. In this hybrid proposal, although the gel detector do not have spatial resolution per se, it is possible to obtain a dose profile (1D image) as a function of the position by using a collimator array. As a result, the gamma detector system described allows a complete integrated radiation detector within the low field NMR (lfNMR) system. Finally we present the better configuration for the hybrid system considering the collimator parameters such as height, thickness and distance.},
doi = {10.1063/1.4955390},
journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 1753,
place = {United States},
year = {2016},
month = {7}
}