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Effective dose in low-dose CT compared with radiography for templating of total hip arthroplasty

Geijer, Mats LU ; Rundgren, Gustav; Weber, Lars LU and Flivik, Gunnar LU (2017) In Acta Radiologica 58(10). p.1276-1282
Abstract
Background
Recently, total hip arthroplasty (THA) has come to focus on restoration of individual anatomy including femoral neck anteversion and global offset (femoral and acetabular offset). Three-dimensional (3D) computed tomography (CT) data could provide a better basis for preoperative templating. The use of CT has been hampered by high radiation dose.

Purpose
To evaluate the effective dose used in pelvis and hip CT for THA templating.

Material and Methods
CT data from two clinical trials of THA were evaluated for CT scan length and volume CT dose index (CTDIvol). The effective doses from hip-knee-ankle CT and pelvis and hip radiography were compared. Conversion factors for effective dose for radiography... (More)
Background
Recently, total hip arthroplasty (THA) has come to focus on restoration of individual anatomy including femoral neck anteversion and global offset (femoral and acetabular offset). Three-dimensional (3D) computed tomography (CT) data could provide a better basis for preoperative templating. The use of CT has been hampered by high radiation dose.

Purpose
To evaluate the effective dose used in pelvis and hip CT for THA templating.

Material and Methods
CT data from two clinical trials of THA were evaluated for CT scan length and volume CT dose index (CTDIvol). The effective doses from hip-knee-ankle CT and pelvis and hip radiography were compared. Conversion factors for effective dose for radiography were calculated using the PCXMC software.

Results
A reduced dose CT protocol for pelvis imaging gave a substantial dose reduction compared with standard CT, while maintaining sufficient image quality. Between the two clinical trials there was a significant reduction in effective CT dose corresponding to changes in the CT protocol (P < 0.01). The CT dose for the latter group was similar to, but nevertheless significantly higher than for, radiography (P < 0.01). However, in the latter group the theoretical minimum dose for CT, using the minimum scan length required by the templating software, was equal to the dose from radiography.

Conclusion
Although the CT dose remained higher than for radiography, potential reductions in scan length could reduce the dose further so that CT would have a comparable level of risk to radiography with the added benefit of 3D templating. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Acta Radiologica
volume
58
issue
10
pages
7 pages
publisher
John Wiley & Sons
external identifiers
  • scopus:85027459537
  • wos:000408644400016
ISSN
0284-1851
DOI
10.1177/0284185117693462
language
English
LU publication?
yes
id
25436970-4c7c-49ce-b45c-77fc85589834
date added to LUP
2017-01-18 14:59:54
date last changed
2018-01-07 11:45:36
@article{25436970-4c7c-49ce-b45c-77fc85589834,
  abstract     = {Background<br>
Recently, total hip arthroplasty (THA) has come to focus on restoration of individual anatomy including femoral neck anteversion and global offset (femoral and acetabular offset). Three-dimensional (3D) computed tomography (CT) data could provide a better basis for preoperative templating. The use of CT has been hampered by high radiation dose.<br>
<br>
Purpose<br>
To evaluate the effective dose used in pelvis and hip CT for THA templating.<br>
<br>
Material and Methods<br>
CT data from two clinical trials of THA were evaluated for CT scan length and volume CT dose index (CTDIvol). The effective doses from hip-knee-ankle CT and pelvis and hip radiography were compared. Conversion factors for effective dose for radiography were calculated using the PCXMC software.<br>
<br>
Results<br>
A reduced dose CT protocol for pelvis imaging gave a substantial dose reduction compared with standard CT, while maintaining sufficient image quality. Between the two clinical trials there was a significant reduction in effective CT dose corresponding to changes in the CT protocol (P &lt; 0.01). The CT dose for the latter group was similar to, but nevertheless significantly higher than for, radiography (P &lt; 0.01). However, in the latter group the theoretical minimum dose for CT, using the minimum scan length required by the templating software, was equal to the dose from radiography.<br>
<br>
Conclusion<br>
Although the CT dose remained higher than for radiography, potential reductions in scan length could reduce the dose further so that CT would have a comparable level of risk to radiography with the added benefit of 3D templating.},
  author       = {Geijer, Mats and Rundgren, Gustav and Weber, Lars and Flivik, Gunnar},
  issn         = {0284-1851},
  language     = {eng},
  month        = {10},
  number       = {10},
  pages        = {1276--1282},
  publisher    = {John Wiley & Sons},
  series       = {Acta Radiologica},
  title        = {Effective dose in low-dose CT compared with radiography for templating of total hip arthroplasty},
  url          = {http://dx.doi.org/10.1177/0284185117693462},
  volume       = {58},
  year         = {2017},
}