Reduction of dark-band-like metal artifacts caused by dental implant bodies using hypothetical monoenergetic imaging after dual-energy computed tomography

Background Periprosthetic bone loss is considered to be a potentially contributing factor in aseptic loosening of acetabular hip components, but no studies have shown this association. The lack of association might be caused by insufficient image quality because of metal artifacts and challenges in measuring bone density (BMD) in complex anatomic structures which might be overcome using dual-energy computed tomography (DECT). Purpose To test inter- and intra-observer agreement and reliability of in-house segmentation software measuring BMD adjacent to acetabular cup and to compare measurements performed with single-energy CT (SECT) and DECT in cemented and cementless cups. Material and Methods Twenty-four acetabular cups inserted in porcine hip specimens were scanned with SECT and DECT. Bone density was measured in a three-dimensional volume adjacent to the cup. Double measurements were performed. Results BMD derived from SECT was approximately four times higher than that of DECT. In both scan modes, intraclass correlation coefficient (ICC) was >0.90 with no differences between repeated measurements, except for uncemented cups where a statistically significant difference of 11 mg/cm3 was found with DECT. DECT showed narrower limits of agreement than SECT. Inter-observer analysis showed small differences. Conclusion BMD can be estimated with high intra- and inter-observer reliability with SECT and DECT around acetabular cups using custom software. The intra- and inter-observer agreement of DECT is superior to that of SECT and better in the cementless concept. Good intra- and inter-observer reliability can be obtained in both cemented and cementless cups using the segmentation software. SECT and DECT cannot be used interchangeably.

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Carotid and cerebrovascular dual-energy computed tomography angiography: Optimization of window settings for virtual monoenergetic imaging reconstruction

European Journal of Radiology ◽

10.1016/j.ejrad.2020.109166 ◽

2020 ◽

Vol 130 ◽

pp. 109166

Author(s):

Tommaso D'Angelo ◽

Lukas Lenga ◽

Christophe T. Arendt ◽

Andreas M. Bucher ◽

Julia L. Peterke ◽

...

Keyword(s):

Computed Tomography ◽

Computed Tomography Angiography ◽

Dual Energy ◽

Dual Energy Computed Tomography ◽

Virtual Monoenergetic Imaging ◽

Imaging Reconstruction ◽

Monoenergetic Imaging

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Efficiency of dual-energy computed tomography enterography in the diagnosis of Crohn’s disease

BMC Medical Imaging ◽

10.1186/s12880-021-00716-y ◽

2021 ◽

Vol 21 (1) ◽

Author(s):

Jinghao Chen ◽

Jie Zhou ◽

Jushun Yang ◽

Ruochen Cong ◽

Jinjie Sun ◽

...

Keyword(s):

Computed Tomography ◽

Crohn’S Disease ◽

Crohn's Disease ◽

Dual Energy ◽

Diagnostic Efficiency ◽

Diagnostic Efficacy ◽

Dual Energy Computed Tomography ◽

Computed Tomography Enterography ◽

Monoenergetic Imaging ◽

Iodine Map

Abstract Background This retrospective study aimed to investigate the usefulness of the optimized kiloelectron volt (keV) for virtual monoenergetic imaging (VMI) combined with iodine map in dual-energy computed tomography enterography (DECTE) in the diagnosis of Crohn’s disease (CD). Methods Seventy-two patients (mean age: 41.89 ± 17.28 years) with negative computed tomography enterography (CTE) were enrolled for investigating the optimized VMI keV in DECTE by comparing subjective and objective parameters of VMIs that were reconstructed from 40 to 90 keV. Moreover, 68 patients (38.27 ± 15.10 years; 35 normal and 33 CD) were included for evaluating the diagnostic efficacy of DECTE iodine map at the optimized VMI energy level and routine CTE for CD and active CD. Statistical analysis for all data was conducted. Results Objective and subjective imaging evaluations showed the best results at 60 keV for VMIs. The CT values of the normal group, active subgroup, and CD group during the small intestinal phase at routine 120 kVp or 60 keV VMI had significant differences. The diagnostic efficacy of an iodine map was the best when NIC = 4% or fat value = 45.8% for CD, whereas NIC < 0.35 or the fat value < 0.38 for active CD. The combined routine CTE and optimized VMI improved the diagnostic efficacy (P < 0.001). Conclusions VMI at 60 keV provided the best imaging quality on DECTE. NIC and fat value provided important basis for active CD evaluation. Routine CTE combined with VMI at 60 keV improved the diagnostic efficiency for CD.

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