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Title: Physical characteristics of a low-dose gas microstrip detector for orthopedic x-ray imaging

Abstract

A new scanning slit gas detector dedicated to orthopedic x-ray imaging is presented and evaluated in terms of its fundamental imaging characteristics. The system is based on the micromesh gaseous structure detector and achieves primary signal amplification through electronic avalanche in the gas. This feature, together with high quantum detection efficiency and fan-beam geometry, allows for imaging at low radiation levels. The system is composed of 1764 channels spanning a width of 44.8 cm and is capable of imaging an entire patient at speeds of up to 15 cm/s. The resolution was found to be anisotropic and significantly affected by the beam quality in the horizontal direction, but otherwise sufficient for orthopedic studies. As a consequence of line-by-line acquisition, the images contain some ripple components due to mechanical vibrations combined with variations in the x-ray tube output power. The reported detective quantum efficiency (DQE) values are relatively low (0.14 to 0.20 at 0.5 mm{sup -1}) as a consequence of a suboptimal collimation geometry. The DQE values were found to be unaffected by the exposure down to 7 {mu}Gy, suggesting that the system is quantum limited even for low radiation levels. A system composed of two orthogonal detectors is already inmore » use and can produce dual-view full body scans at low doses. This device could contribute to reduce the risk of radiation induced cancer in sensitive clientele undergoing intensive x-ray procedures, like young scoliotic women.« less

Authors:
; ; ;  [1];  [2]
  1. Hopital Notre-Dame du Centre Hospitalier de l'Universite de Montreal, Departement de Radiologie, 1560 rue Sherbrooke est, Montreal, Quebec, H2L 4M1 (Canada)
  2. (Canada)
Publication Date:
OSTI Identifier:
20634656
Resource Type:
Journal Article
Resource Relation:
Journal Name: Medical Physics; Journal Volume: 32; Journal Issue: 4; Other Information: DOI: 10.1118/1.1876592; (c) 2005 American Association of Physicists in Medicine; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
62 RADIOLOGY AND NUCLEAR MEDICINE; ANISOTROPY; IMAGES; MECHANICAL VIBRATIONS; NEOPLASMS; RADIATION DOSES; SIGNALS; X-RAY TUBES

Citation Formats

Despres, Philippe, Beaudoin, Gilles, Gravel, Pierre, Guise, Jacques A. de, and Laboratoire de Recherche en Imagerie et Orthopedie, Ecole de Technologie Superieure, 1100 rue Notre-Dame ouest, Montreal, Quebec, H3C 1K3. Physical characteristics of a low-dose gas microstrip detector for orthopedic x-ray imaging. United States: N. p., 2005. Web. doi:10.1118/1.1876592.
Despres, Philippe, Beaudoin, Gilles, Gravel, Pierre, Guise, Jacques A. de, & Laboratoire de Recherche en Imagerie et Orthopedie, Ecole de Technologie Superieure, 1100 rue Notre-Dame ouest, Montreal, Quebec, H3C 1K3. Physical characteristics of a low-dose gas microstrip detector for orthopedic x-ray imaging. United States. doi:10.1118/1.1876592.
Despres, Philippe, Beaudoin, Gilles, Gravel, Pierre, Guise, Jacques A. de, and Laboratoire de Recherche en Imagerie et Orthopedie, Ecole de Technologie Superieure, 1100 rue Notre-Dame ouest, Montreal, Quebec, H3C 1K3. Fri . "Physical characteristics of a low-dose gas microstrip detector for orthopedic x-ray imaging". United States. doi:10.1118/1.1876592.
@article{osti_20634656,
title = {Physical characteristics of a low-dose gas microstrip detector for orthopedic x-ray imaging},
author = {Despres, Philippe and Beaudoin, Gilles and Gravel, Pierre and Guise, Jacques A. de and Laboratoire de Recherche en Imagerie et Orthopedie, Ecole de Technologie Superieure, 1100 rue Notre-Dame ouest, Montreal, Quebec, H3C 1K3},
abstractNote = {A new scanning slit gas detector dedicated to orthopedic x-ray imaging is presented and evaluated in terms of its fundamental imaging characteristics. The system is based on the micromesh gaseous structure detector and achieves primary signal amplification through electronic avalanche in the gas. This feature, together with high quantum detection efficiency and fan-beam geometry, allows for imaging at low radiation levels. The system is composed of 1764 channels spanning a width of 44.8 cm and is capable of imaging an entire patient at speeds of up to 15 cm/s. The resolution was found to be anisotropic and significantly affected by the beam quality in the horizontal direction, but otherwise sufficient for orthopedic studies. As a consequence of line-by-line acquisition, the images contain some ripple components due to mechanical vibrations combined with variations in the x-ray tube output power. The reported detective quantum efficiency (DQE) values are relatively low (0.14 to 0.20 at 0.5 mm{sup -1}) as a consequence of a suboptimal collimation geometry. The DQE values were found to be unaffected by the exposure down to 7 {mu}Gy, suggesting that the system is quantum limited even for low radiation levels. A system composed of two orthogonal detectors is already in use and can produce dual-view full body scans at low doses. This device could contribute to reduce the risk of radiation induced cancer in sensitive clientele undergoing intensive x-ray procedures, like young scoliotic women.},
doi = {10.1118/1.1876592},
journal = {Medical Physics},
number = 4,
volume = 32,
place = {United States},
year = {Fri Apr 01 00:00:00 EST 2005},
month = {Fri Apr 01 00:00:00 EST 2005}
}