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J Comput Assist Tomogr. 2015 Sep-Oct;39(5):649-56. doi: 10.1097/RCT.0000000000000271.

Low Dose Computed Tomography for 3D Planning of Total Hip Arthroplasty: Evaluation of Radiation Exposure and Image Quality.

Author information

1
From the *Department of Radiology, Klinikum Ernst von Bergmann, Potsdam; †Department of Radiology, Charité-Universitätsmedizin Berlin, Berlin, Germany; ‡Department of Orthopaedic Surgery, Hôpital Pitié Salpétrière, Paris, France; §Scossis Statistical Consulting; and ∥Orthopaedic Surgery, Proendo, Berlin, Germany.

Abstract

OBJECTIVE:

The aim of the study was to compare radiation exposure and image quality between dedicated computed tomography (CT) protocols for preoperative total hip arthroplasty (THA) planning.

METHODS:

Three protocols with automated tube current modulation using 64-slice (n = 177) and 128-slice CT scanners without (n = 129) and with automated tube voltage preselection (n = 84) were compared.

RESULTS:

All 390 CTs were of sufficient quality for THA planning. Mean DLP was 235.0 mGy*cm (effective dose 2.8 mSv). Lowest radiation exposure (2.5 mSv) was seen with automated voltage preselection and the algorithm's selection was 100 kV (90.5% of patients) and 120 kV. Lowest image noise was seen in the highest dose group (3.1 mSv, 128-slice CT fixed tube voltage). A significant difference in cortical bone radiodensity was seen between 100 kV and 120 kV (P < 0.0001).

CONCLUSIONS:

Preoperative pelvic CT for THA planning is possible with very low radiation dose and reliable quality. Automated voltage preselection further decreases the effective dose by 18.2%.

PMID:
26125297
DOI:
10.1097/RCT.0000000000000271
[Indexed for MEDLINE]

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