Impact of iterative reconstruction on image quality of low-dose CT of the lumbar spine
(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)
- author
- Alshamari, Muhammed ; Geijer, Mats LU ; Norrman, Eva ; Lidén, Mats ; Krauss, Wolfgang ; Jendeberg, Johan ; Magnuson, Anders and Geijer, Håkan
- organization
- publishing date
- 2017
- 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
-
- scopus:85019010032
- wos:000399995700011
- pmid:28157395
- 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
- 2025-01-07 07:50:37
@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}},
}