Thumbnail
Access Restriction
Open

Author Agulles-Pedrós, L. ♦ Abril, A.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword 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
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 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.
ISSN 0094243X
Educational Use Research
Learning Resource Type Article
Publisher Date 2016-07-07
Publisher Place United States
Volume Number 1753
Issue Number 1


Open content in new tab

   Open content in new tab