Noise-optimised virtual monoenergetic imaging of dual-energy CT: effect on metal artefact reduction in patients with lumbar internal fixation

2019 ◽  
Vol 28 (8) ◽  
pp. 1783-1792
Author(s):  
Yanwei Zeng ◽  
Kai Deng ◽  
Haitao Yang ◽  
Yi Tan ◽  
Jun Liu ◽  
...  
Keyword(s):  
Internal Fixation ◽  
Dual Energy ◽  
Dual Energy Ct ◽  
Metal Artefact Reduction ◽  
Virtual Monoenergetic Imaging ◽  
Metal Artefact ◽  
Monoenergetic Imaging ◽  
Artefact Reduction

scholarly journals OC-0181: Dual energy CT facilitates LDR brachytherapy seed metal artefact reduction

2013 ◽  
Vol 106 ◽  
pp. S70-S71
Author(s):  
G. Landry ◽  
B. Reniers ◽  
E. Vigneault ◽  
L. Beaulieu ◽  
J. Wildberger ◽  
...  
Keyword(s):  
Dual Energy ◽  
Dual Energy Ct ◽  
Metal Artefact Reduction ◽  
Ldr Brachytherapy ◽  
Metal Artefact ◽  
Artefact Reduction

CT metal artefact reduction for internal fixation of the proximal humerus: Value of mono-energetic extrapolation from dual-energy and iterative reconstructions

2014 ◽  
Vol 69 (5) ◽  
pp. e199-e206 ◽  
Author(s):  
S. Winklhofer ◽  
E. Benninger ◽  
C. Spross ◽  
F. Morsbach ◽  
S. Rahm ◽  
...  
Keyword(s):  
Internal Fixation ◽  
Proximal Humerus ◽  
Dual Energy ◽  
Metal Artefact Reduction ◽  
Metal Artefact ◽  
Artefact Reduction

Visibility of bony structures around hip prostheses in dual-energy CT: With or without metal artefact reduction software

2018 ◽  
Vol 62 (5) ◽  
pp. 634-641 ◽  
Author(s):  
Jewon Jeong ◽  
Hyun-joo Kim ◽  
Eunsun Oh ◽  
Jang Gyu Cha ◽  
Jiyoung Hwang ◽  
...  
Keyword(s):  
Dual Energy ◽  
Dual Energy Ct ◽  
Hip Prostheses ◽  
Metal Artefact Reduction ◽  
Metal Artefact ◽  
Artefact Reduction

scholarly journals OC-0153: Dual energy CT and iterative metal artefact reduction for accurate tumour delineation

2016 ◽  
Vol 119 ◽  
pp. S70
Author(s):  
D. Kovacs ◽  
L. Rechner ◽  
J. Bangsgaard ◽  
A. Berthelsen ◽  
J. Costa ◽  
...  
Keyword(s):  
Dual Energy ◽  
Dual Energy Ct ◽  
Metal Artefact Reduction ◽  
Tumour Delineation ◽  
Metal Artefact ◽  
Artefact Reduction

Metal artefact reduction in gemstone spectral imaging dual-energy CT with and without metal artefact reduction software

2012 ◽  
Vol 22 (6) ◽  
pp. 1331-1340 ◽  
Author(s):  
Young Han Lee ◽  
Kwan Kyu Park ◽  
Ho-Taek Song ◽  
Sungjun Kim ◽  
Jin-Suck Suh
Keyword(s):  
Spectral Imaging ◽  
Dual Energy ◽  
Dual Energy Ct ◽  
Metal Artefact Reduction ◽  
Gemstone Spectral Imaging ◽  
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.

Optimization of keV-settings in abdominal and lower extremity dual-source dual-energy CT angiography determined with virtual monoenergetic imaging

2013 ◽  
Vol 82 (10) ◽  
pp. e574-e581 ◽  
Author(s):  
Sonja Sudarski ◽  
Paul Apfaltrer ◽  
John W. Nance ◽  
David Schneider ◽  
Mathias Meyer ◽  
...  
Keyword(s):  
Lower Extremity ◽  
Ct Angiography ◽  
Dual Energy ◽  
Dual Energy Ct ◽  
Virtual Monoenergetic Imaging ◽  
Dual Source ◽  
Monoenergetic Imaging

scholarly journals Metal artifact reduction techniques for single energy CT and dual-energy CT with various metal materials

BJR|Open ◽  
2019 ◽  
Vol 1 (1) ◽  
pp. bjro.20180045 ◽  
Author(s):  
Daisuke Kawahara ◽  
Shuichi Ozawa ◽  
Kazushi Yokomachi ◽  
Toru Higaki ◽  
Takehiro Shiinoki ◽  
...  
Keyword(s):  
Electron Density ◽  
Ct Images ◽  
Dual Energy ◽  
Dual Energy Ct ◽  
Ct Image ◽  
Metal Artifacts ◽  
Energy Reconstruction ◽  
Metal Artefact ◽  
Artefact Reduction ◽  
Metal Materials

Objective: The aim of the current study is to evaluate the effectiveness of reduction metal artifacts using kV-CT image with the single-energy based metal artefact reduction (SEMAR) technique by single-energy reconstruction, monochromatic CT and rED reconstructed by dual-energy reconstruction. Methods: Seven different metal materials (brass, aluminum, copper, stainless, steel, lead and titanium) were placed inside the water-based PMMA phantom. After DECT-based scan, the artefact index (AI) were evaluated with the kV-CT images with and without SEMAR by single-energy reconstruction, and raw-data based electron density (rED), monochromatic CT images by dual-energy reconstruction. Moreover, the AI with evaluated with rED and the converted ED images from the kV-CT and monochromatic CT images. Results: The minimum average value of the AI with all-metal inserts was approximately 80 keV. The AI without SEMAR was larger than that with SEMAR for the 80 kV and 135 kV CT images. In the comparison of the AI for the rED and ED images that were converted from 80 kV and 135 kV CT images with and without SEMAR, the monochromatic CT images of the PMMA phantom with inserted metal materials at 80 keV revealed that the kV-CT with SEMAR reduced the metal artefact substantially. Conclusion: The converted ED from the kV-CT and monochromatic CT images could be useful for a comparison of the AI using the same contrast scale. The kV-CT image with SEMAR by single-energy reconstruction was found to substantially reduce metal artefact. Advances in knowledge: The effectiveness of reduction of metal artifacts using single-energy based metal artefact reduction (SEMAR) technique and dual-energy CT (DECT) was evaluated the electron density conversion techniques.

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