Bone mineral density measurements in vertebral specimens and phantoms using dual-layer spectral computed tomography.

Mei, Kai; Schwaiger, Benedikt J; Kopp, Felix K; Ehn, Sebastian; Gersing, Alexandra S; Kirschke, Jan S; Muenzel, Daniela; Fingerle, Alexander A; Rummeny, Ernst J; Pfeiffer, Franz; Baum, Thomas; Noël, Peter B

doi:10.1038/s41598-017-17855-4

journal article

Dokumenttyp:: Journal Article
Autor(en):: Mei, Kai; Schwaiger, Benedikt J; Kopp, Felix K; Ehn, Sebastian; Gersing, Alexandra S; Kirschke, Jan S; Muenzel, Daniela; Fingerle, Alexander A; Rummeny, Ernst J; Pfeiffer, Franz; Baum, Thomas; Noël, Peter B
Titel:: Bone mineral density measurements in vertebral specimens and phantoms using dual-layer spectral computed tomography.
Abstract:: To assess whether phantomless calcium-hydroxyapatite (HA) specific bone mineral density (BMD) measurements with dual-layer spectral computed tomography are accurate in phantoms and vertebral specimens. Ex-vivo human vertebrae (n = 13) and a phantom containing different known HA concentrations were placed in a semi-anthropomorphic abdomen phantom with different extension rings simulating different degrees of obesity. Phantomless dual-layer spectral CT was performed at different tube current settings (500, 250, 125 and 50 mAs). HA-specific BMD was derived from spectral-based virtual monoenergetic images at 50 keV and 200 keV. Values were compared to the HA concentrations of the phantoms and conventional qCT measurements using a reference phantom, respectively. Above 125 mAs, errors for phantom measurements ranged between -1.3% to 4.8%, based on spectral information. In vertebral specimens, high correlations were found between BMD values assessed with spectral CT and conventional qCT (r ranging between 0.96 and 0.99; p < 0.001 for all) with different extension rings, and a high agreement was found in Bland Altman plots. Different degrees of obesity did not have a significant influence on measurements (P > 0.05 for all). These results suggest a high validity of HA-specific BMD measurements based on dual-layer spectral CT examinations in setups simulating different degrees of obesity without the need for a reference phantom, thus demonstrating their feasibility in clinical routine.
Zeitschriftentitel:: Sci Rep
Jahr:: 2017
Band / Volume:: 7
Heft / Issue:: 1
Seitenangaben Beitrag:: 17519
Sprache:: eng
Volltext / DOI:: doi:10.1038/s41598-017-17855-4
PubMed:: http://view.ncbi.nlm.nih.gov/pubmed/29235542
Print-ISSN:: 2045-2322
TUM Einrichtung:: Fachgebiet Neuroradiologie (Prof. Zimmer)
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