Skip to main content

Lund University Publications

LUND UNIVERSITY LIBRARIES

Impact of iterative reconstruction on image quality of low-dose CT of the lumbar spine

Alshamari, Muhammed ; Geijer, Mats LU ; Norrman, Eva ; Lidén, Mats ; Krauss, Wolfgang ; Jendeberg, Johan ; Magnuson, Anders and Geijer, Håkan (2017) In Acta radiologica (Stockholm, Sweden : 1987) 58(6). p.702-709
Abstract

Background Iterative reconstruction (IR) is a recent reconstruction algorithm for computed tomography (CT) that can be used instead of the standard algorithm, filtered back projection (FBP), to reduce radiation dose and/or improve image quality. Purpose To evaluate and compare the image quality of low-dose CT of the lumbar spine reconstructed with IR to conventional FBP, without further reduction of radiation dose. Material and Methods Low-dose CT on 55 patients was performed on a Siemens scanner using 120 kV tube voltage, 30 reference mAs, and automatic dose modulation. From raw CT data, lumbar spine CT images were reconstructed with a medium filter (B41f) using FBP and four levels of IR (levels 2-5). Five reviewers scored all images... (More)

Background Iterative reconstruction (IR) is a recent reconstruction algorithm for computed tomography (CT) that can be used instead of the standard algorithm, filtered back projection (FBP), to reduce radiation dose and/or improve image quality. Purpose To evaluate and compare the image quality of low-dose CT of the lumbar spine reconstructed with IR to conventional FBP, without further reduction of radiation dose. Material and Methods Low-dose CT on 55 patients was performed on a Siemens scanner using 120 kV tube voltage, 30 reference mAs, and automatic dose modulation. From raw CT data, lumbar spine CT images were reconstructed with a medium filter (B41f) using FBP and four levels of IR (levels 2-5). Five reviewers scored all images on seven image quality criteria according to the European guidelines on quality criteria for CT, using a five-grade scale. A side-by-side comparison was also performed. Results There was significant improvement in image quality for IR (levels 2-4) compared to FBP. According to visual grading regression, odds ratios of all criteria with 95% confidence intervals for IR2, IR3, IR4, and IR5 were: 1.59 (1.39-1.83), 1.74 (1.51-1.99), 1.68 (1.46-1.93), and 1.08 (0.94-1.23), respectively. In the side-by-side comparison of all reconstructions, images with IR (levels 2-4) received the highest scores. The mean overall CTDIvol was 1.70 mGy (SD 0.46; range, 1.01-3.83 mGy). Image noise decreased in a linear fashion with increased strength of IR. Conclusion Iterative reconstruction at levels 2, 3, and 4 improves image quality of low-dose CT of the lumbar spine compared to FPB.

(Less)
Please use this url to cite or link to this publication:
author
; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Journal Article
in
Acta radiologica (Stockholm, Sweden : 1987)
volume
58
issue
6
pages
702 - 709
publisher
SAGE Publications
external identifiers
  • pmid:28157395
  • scopus:85019010032
  • wos:000399995700011
ISSN
1600-0455
DOI
10.1177/0284185116669870
language
English
LU publication?
yes
id
9a4d38e5-e25b-48ae-9198-d162fc7f8acb
date added to LUP
2017-02-21 12:45:13
date last changed
2024-01-28 12:32:03
@article{9a4d38e5-e25b-48ae-9198-d162fc7f8acb,
  abstract     = {{<p>Background Iterative reconstruction (IR) is a recent reconstruction algorithm for computed tomography (CT) that can be used instead of the standard algorithm, filtered back projection (FBP), to reduce radiation dose and/or improve image quality. Purpose To evaluate and compare the image quality of low-dose CT of the lumbar spine reconstructed with IR to conventional FBP, without further reduction of radiation dose. Material and Methods Low-dose CT on 55 patients was performed on a Siemens scanner using 120 kV tube voltage, 30 reference mAs, and automatic dose modulation. From raw CT data, lumbar spine CT images were reconstructed with a medium filter (B41f) using FBP and four levels of IR (levels 2-5). Five reviewers scored all images on seven image quality criteria according to the European guidelines on quality criteria for CT, using a five-grade scale. A side-by-side comparison was also performed. Results There was significant improvement in image quality for IR (levels 2-4) compared to FBP. According to visual grading regression, odds ratios of all criteria with 95% confidence intervals for IR2, IR3, IR4, and IR5 were: 1.59 (1.39-1.83), 1.74 (1.51-1.99), 1.68 (1.46-1.93), and 1.08 (0.94-1.23), respectively. In the side-by-side comparison of all reconstructions, images with IR (levels 2-4) received the highest scores. The mean overall CTDIvol was 1.70 mGy (SD 0.46; range, 1.01-3.83 mGy). Image noise decreased in a linear fashion with increased strength of IR. Conclusion Iterative reconstruction at levels 2, 3, and 4 improves image quality of low-dose CT of the lumbar spine compared to FPB.</p>}},
  author       = {{Alshamari, Muhammed and Geijer, Mats and Norrman, Eva and Lidén, Mats and Krauss, Wolfgang and Jendeberg, Johan and Magnuson, Anders and Geijer, Håkan}},
  issn         = {{1600-0455}},
  keywords     = {{Journal Article}},
  language     = {{eng}},
  number       = {{6}},
  pages        = {{702--709}},
  publisher    = {{SAGE Publications}},
  series       = {{Acta radiologica (Stockholm, Sweden : 1987)}},
  title        = {{Impact of iterative reconstruction on image quality of low-dose CT of the lumbar spine}},
  url          = {{http://dx.doi.org/10.1177/0284185116669870}},
  doi          = {{10.1177/0284185116669870}},
  volume       = {{58}},
  year         = {{2017}},
}