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Combined Dual-Energy and Single-Energy Metal Artifact Reduction Techniques Versus Single-Energy Techniques Alone for Lesion Detection Near an Arthroplasty.
- Source :
-
AJR. American journal of roentgenology [AJR Am J Roentgenol] 2020 Aug; Vol. 215 (2), pp. 425-432. Date of Electronic Publication: 2020 May 06. - Publication Year :
- 2020
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Abstract
- OBJECTIVE. The purpose of this study was to compare a combined dual-energy CT (DECT) and single-energy CT (SECT) metal artifact reduction technique with a SECT metal artifact reduction technique for detecting lesions near an arthroplasty in a phantom model. MATERIALS AND METHODS. Two CT phantoms with a cobalt chromium sphere attached to a titanium rod, simulating an arthroplasty, within a background of soft-tissue attenuation containing spherical lesions (range, 10-20 mm) around the head and stem of different attenuations from the background (range of attenuation, 10-70 HU) were scanned with a single CT scanner individually (unilateral) and together (bilateral) with the following three dose-equivalent techniques: the currently used clinical protocol (140 kVp, 300 Reference mAs); 100 kVp; and DECT (100 kVp and 150 kVp with a tin filter). Three radiologists reviewed the datasets to identify lesions. Nonparametric AUC was estimated for each reader with each technique. Multireader ANOVA was performed to compare AUCs. Multiple-variable logistic regression analysis was used to identify factors affecting sensitivity and specificity. RESULTS. Accuracy was lower ( p < 0.001) for the DECT 130-keV technique than for the 100-, 70-, and 140-kVp techniques. Sensitivity was higher with unilateral arthroplasties ( p = 0.037), with greater contrast differences from background ( p < 0.001), and with the SECT 100-kVp technique versus other techniques ( p < 0.001). The difference in specificities of modalities was not statistically significant ( p = 0.148). CONCLUSION. Combining DECT and SECT techniques does not provide additional benefits for lesion detection as opposed to using SECT alone.
Details
- Language :
- English
- ISSN :
- 1546-3141
- Volume :
- 215
- Issue :
- 2
- Database :
- MEDLINE
- Journal :
- AJR. American journal of roentgenology
- Publication Type :
- Academic Journal
- Accession number :
- 32374668
- Full Text :
- https://doi.org/10.2214/AJR.19.22084