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Effective dose in low-dose CT compared with radiography for templating of total hip arthroplasty
Örebro University Hospital. Department of Radiology, Faculty of Medicine and Health, Örebro University Hospital, Örebro, Sweden; Department of Clinical Sciences, Lund University, Lund, Sweden.ORCID iD: 0000-0003-0529-7723
Department of Clinical Sciences, Lund University, Lund, Sweden.
Department of Clinical Sciences, Lund University, Lund, Sweden; Department of Radiation Physics, Skåne University Hospital, Lund, Sweden.
Department of Clinical Sciences, Lund University, Lund, Sweden; Department of Orthopedics, Skåne University Hospital, Lund, Sweden.
2017 (English)In: Acta Radiologica, ISSN 0284-1851, E-ISSN 1600-0455, Vol. 58, no 10, 1276-1282 p.Article in journal (Refereed) Published
Abstract [en]

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 CTwould have a comparable level of risk to radiography with the added benefit of 3D templating.

Place, publisher, year, edition, pages
London, United Kingdom: Sage Publications, 2017. Vol. 58, no 10, 1276-1282 p.
Keyword [en]
X-ray computed tomography (CT), radiography, hip arthroplasty, radiation dose
National Category
Radiology, Nuclear Medicine and Medical Imaging
Identifiers
URN: urn:nbn:se:oru:diva-61035DOI: 10.1177/0284185117693462ISI: 000408644400016PubMedID: 28347158Scopus ID: 2-s2.0-85027459537OAI: oai:DiVA.org:oru-61035DiVA: diva2:1142351
Available from: 2017-09-19 Created: 2017-09-19 Last updated: 2017-10-12Bibliographically approved

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