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Low-dose computed tomography of the lumbar spine: a phantom study on imaging parameters and image quality

Alshamari, Muhammed; Geijer, Mats LU ; Norrman, Eva and Geijer, Hakan (2014) In Acta Radiologica 55(7). p.824-832
Abstract
Background: Lumbar spine radiography has limited diagnostic value but low radiation dose compared with computed tomography (CT). The average effective radiation dose from lumbar spine radiography is about 1.1 mSv. Low-dose lumbar spine CT may be an alternative to increase the diagnostic value at low radiation dose, around 1 mSv. Purpose: To determine the optimal settings for low-dose lumbar spine CT simultaneously aiming for the highest diagnostic image quality possible. Material and Methods: An ovine lower thoracic and lumbar spine phantom, with all soft tissues around the vertebrae preserved except the skin, was placed in a 20 L plastic container filled with water. The phantom was scanned repeatedly with various technical settings;... (More)
Background: Lumbar spine radiography has limited diagnostic value but low radiation dose compared with computed tomography (CT). The average effective radiation dose from lumbar spine radiography is about 1.1 mSv. Low-dose lumbar spine CT may be an alternative to increase the diagnostic value at low radiation dose, around 1 mSv. Purpose: To determine the optimal settings for low-dose lumbar spine CT simultaneously aiming for the highest diagnostic image quality possible. Material and Methods: An ovine lower thoracic and lumbar spine phantom, with all soft tissues around the vertebrae preserved except the skin, was placed in a 20 L plastic container filled with water. The phantom was scanned repeatedly with various technical settings; different tube potential, reference mAs, and with different convolution filters. Five radiologists evaluated the image quality according to a modification of the European guidelines for multislice computed tomography (MSCT) quality criteria for lumbar spine CT 2004. In a visual comparison the different scans were also ranked subjectively according to perceived image quality. Image noise and contrast were measured. Results: A tube potential of 120 kV with reference mAs 30 and medium or medium smooth convolution filter gave the best image quality at a sub-millisievert dose level, i.e. with an effective dose comparable to that from lumbar spine radiography. Conclusion: Low-dose lumbar spine CT thus opens a possibility to substitute lumbar spine radiography with CT without obvious increase in radiation dose. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
CT, conventional radiography, spine, structures, techniques
in
Acta Radiologica
volume
55
issue
7
pages
824 - 832
publisher
John Wiley & Sons
external identifiers
  • wos:000342575300008
  • scopus:84907878366
ISSN
1600-0455
DOI
10.1177/0284185113509615
language
English
LU publication?
yes
id
9c387b12-b96c-42b3-817e-2dcd3d2e2ce1 (old id 4803554)
date added to LUP
2014-12-01 07:34:50
date last changed
2017-10-01 04:14:23
@article{9c387b12-b96c-42b3-817e-2dcd3d2e2ce1,
  abstract     = {Background: Lumbar spine radiography has limited diagnostic value but low radiation dose compared with computed tomography (CT). The average effective radiation dose from lumbar spine radiography is about 1.1 mSv. Low-dose lumbar spine CT may be an alternative to increase the diagnostic value at low radiation dose, around 1 mSv. Purpose: To determine the optimal settings for low-dose lumbar spine CT simultaneously aiming for the highest diagnostic image quality possible. Material and Methods: An ovine lower thoracic and lumbar spine phantom, with all soft tissues around the vertebrae preserved except the skin, was placed in a 20 L plastic container filled with water. The phantom was scanned repeatedly with various technical settings; different tube potential, reference mAs, and with different convolution filters. Five radiologists evaluated the image quality according to a modification of the European guidelines for multislice computed tomography (MSCT) quality criteria for lumbar spine CT 2004. In a visual comparison the different scans were also ranked subjectively according to perceived image quality. Image noise and contrast were measured. Results: A tube potential of 120 kV with reference mAs 30 and medium or medium smooth convolution filter gave the best image quality at a sub-millisievert dose level, i.e. with an effective dose comparable to that from lumbar spine radiography. Conclusion: Low-dose lumbar spine CT thus opens a possibility to substitute lumbar spine radiography with CT without obvious increase in radiation dose.},
  author       = {Alshamari, Muhammed and Geijer, Mats and Norrman, Eva and Geijer, Hakan},
  issn         = {1600-0455},
  keyword      = {CT,conventional radiography,spine,structures,techniques},
  language     = {eng},
  number       = {7},
  pages        = {824--832},
  publisher    = {John Wiley & Sons},
  series       = {Acta Radiologica},
  title        = {Low-dose computed tomography of the lumbar spine: a phantom study on imaging parameters and image quality},
  url          = {http://dx.doi.org/10.1177/0284185113509615},
  volume       = {55},
  year         = {2014},
}