Combination of dual-energy computed tomography and iterative metal artefact reduction to increase general quality of imaging for radiotherapy patients with high dense materials. Phantom study

2020 ◽  
Vol 77 ◽  
pp. 92-99
Author(s):  
Bartosz Pawałowski ◽  
Rafał Panek ◽  
Hubert Szweda ◽  
Tomasz Piotrowski
Keyword(s):  
Computed Tomography ◽  
Dual Energy ◽  
Phantom Study ◽  
Dual Energy Computed Tomography ◽  
Metal Artefact Reduction ◽  
General Quality ◽  
Metal Artefact ◽  
Artefact Reduction

scholarly journals Metal artefact reduction of different alloys with dual energy computed tomography (DECT)

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Anand John Vellarackal ◽  
Achim Hermann Kaim
Keyword(s):  
Stainless Steel ◽  
Image Quality ◽  
Femoral Stem ◽  
Dual Energy ◽  
Dual Energy Ct ◽  
Bony Tissue ◽  
Stem Image ◽  
Metal Artefact ◽  
Artefact Reduction

AbstractTo evaluate the influence of dual-energy CT (DECT) and Virtual monochromatic spectral (VMS) imaging on: (1) the artefact size of geometrically identical orthopaedic implants consisting of three different compositions and (2) the image quality of the surrounding bone, three similar phantoms—each featuring one femoral stem composed of either titanium, chrome-cobalt or stainless steel surrounded by five calcium pellets (200 mg hydroxyapatite/calcium carbonate) to simulate bony tissue and one reference pellet located away from the femoral stem—were built. DECT with two sequential scans (80 kVp and 140 kVp; scan-to-scan technique) was performed, and VMS images were calculated between 40 and 190 keV. The artefact sizes were measured volumetrically by semiautomatic selection of regions of interest (ROIs), considering the VMS energies and the polychromatic spectres. Moreover, density and image noise within the pellets were measured. All three phantoms exhibit artefact size reduction as energy increases from 40 to 190 keV. Titanium exhibited a stronger reduction than chrome-cobalt and stainless steel. The artefacts were dependent on the diameter of the stem. Image quality increases with higher energies on VMS with a better depiction of surrounding structures. Monoenergetic energies 70 keV and 140 keV demonstrate superior image quality to those produced by spectral energies 80 kVp and 140 kVp.

Computed Tomography Imaging of a Hip Prosthesis Using Iterative Model-Based Reconstruction and Orthopaedic Metal Artefact Reduction

2016 ◽  
Vol 40 (6) ◽  
pp. 971-978 ◽  
Author(s):  
Ruud H.H. Wellenberg ◽  
Martijn F. Boomsma ◽  
Jochen A.C. van Osch ◽  
Alain Vlassenbroek ◽  
Julien Milles ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Hip Prosthesis ◽  
Computed Tomography Imaging ◽  
Tomography Imaging ◽  
Metal Artefact Reduction ◽  
Model Based ◽  
Iterative Model ◽  
Metal Artefact ◽  
Artefact Reduction
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