Qeumars Mustafa Hamie1, Adrian Raoul Kobe1, Leif Mietzsch1, Michael Manhart2, Gilbert Dominique Puippe1, Thomas Pfammatter1, Roman Guggenberger3. 1. Department of Radiology, University Hospital Zurich, Raemistrasse 100, 8091, Zurich, Switzerland. 2. Siemens Healthcare GmbH, Advanced Therapies, Innovation, Imaging Concepts, HC AT IN IMC, Simon-Hegele-Str. 1, 91301, Forchheim, Deutschland. 3. Department of Radiology, University Hospital Zurich, Raemistrasse 100, 8091, Zurich, Switzerland. roman.guggenberger@usz.ch.
Abstract
OBJECTIVE: To investigate the effect of an on-site prototype metal artefact reduction (MAR) algorithm in cone-beam CT-catheter-arteriography (CBCT-CA) in patients undergoing transarterial radioembolisation (RE) of hepatic masses. METHODS AND MATERIALS: Ethical board approved retrospective study of 29 patients (mean 63.7±13.7 years, 11 female), including 16 patients with arterial metallic coils, undergoing CBCT-CA (8s scan, 200 degrees rotation, 397 projections). Image reconstructions with and without prototype MAR algorithm were evaluated quantitatively (streak-artefact attenuation changes) and qualitatively (visibility of hepatic parenchyma and vessels) in near- (<1cm) and far-field (>3cm) of artefact sources (metallic coils and catheters). Quantitative and qualitative measurements of uncorrected and MAR corrected images and different artefact sources were compared RESULTS: Quantitative evaluation showed significant reduction of near- and far-field streak-artefacts with MAR for both artefact sources (p<0.001), while remaining stable for unaffected organs (all p>0.05). Inhomogeneities of attenuation values were significantly higher for metallic coils compared to catheters (p<0.001) and decreased significantly for both after MAR (p<0.001). Qualitative image scores were significantly improved after MAR (all p<0.003) with by trend higher artefact degrees for metallic coils compared to catheters. CONCLUSION: In patients undergoing CBCT-CA for transarterial RE, prototype MAR algorithm improves image quality in proximity of metallic coil and catheter artefacts. KEY POINTS: • Metal objects cause artefacts in cone-beam computed tomography (CBCT) imaging. • These artefacts can be corrected by metal artefact reduction (MAR) algorithms. • Corrected images show significantly better visibility of nearby hepatic vessels and tissue. • Better visibility may facilitate image interpretation, save time and radiation exposure.
OBJECTIVE: To investigate the effect of an on-site prototype metal artefact reduction (MAR) algorithm in cone-beam CT-catheter-arteriography (CBCT-CA) in patients undergoing transarterial radioembolisation (RE) of hepatic masses. METHODS AND MATERIALS: Ethical board approved retrospective study of 29 patients (mean 63.7±13.7 years, 11 female), including 16 patients with arterial metallic coils, undergoing CBCT-CA (8s scan, 200 degrees rotation, 397 projections). Image reconstructions with and without prototype MAR algorithm were evaluated quantitatively (streak-artefact attenuation changes) and qualitatively (visibility of hepatic parenchyma and vessels) in near- (<1cm) and far-field (>3cm) of artefact sources (metallic coils and catheters). Quantitative and qualitative measurements of uncorrected and MAR corrected images and different artefact sources were compared RESULTS: Quantitative evaluation showed significant reduction of near- and far-field streak-artefacts with MAR for both artefact sources (p<0.001), while remaining stable for unaffected organs (all p>0.05). Inhomogeneities of attenuation values were significantly higher for metallic coils compared to catheters (p<0.001) and decreased significantly for both after MAR (p<0.001). Qualitative image scores were significantly improved after MAR (all p<0.003) with by trend higher artefact degrees for metallic coils compared to catheters. CONCLUSION: In patients undergoing CBCT-CA for transarterial RE, prototype MAR algorithm improves image quality in proximity of metallic coil and catheter artefacts. KEY POINTS: • Metal objects cause artefacts in cone-beam computed tomography (CBCT) imaging. • These artefacts can be corrected by metal artefact reduction (MAR) algorithms. • Corrected images show significantly better visibility of nearby hepatic vessels and tissue. • Better visibility may facilitate image interpretation, save time and radiation exposure.
Authors: Hollins P Clark; W Forrest Carson; Peter V Kavanagh; Coty P H Ho; Perry Shen; Ronald J Zagoria Journal: Radiographics Date: 2005-10 Impact factor: 5.333
Authors: Marios-Nikos Psychogios; Bernhard Scholz; Christopher Rohkohl; Yiannis Kyriakou; Alexander Mohr; Peter Schramm; Dorothee Wachter; Katrin Wasser; Michael Knauth Journal: Neuroradiology Date: 2013-04-16 Impact factor: 2.804
Authors: Tim Finkenstaedt; Fabian Morsbach; Maurizio Calcagni; Magdalena Vich; Christian W A Pfirrmann; Hatem Alkadhi; Val M Runge; Gustav Andreisek; Roman Guggenberger Journal: Invest Radiol Date: 2014-08 Impact factor: 6.016
Authors: Rastislav Pjontek; Belgin Önenköprülü; Bernhard Scholz; Yiannis Kyriakou; Gerrit A Schubert; Omid Nikoubashman; Ahmed Othman; Martin Wiesmann; Marc A Brockmann Journal: J Neurointerv Surg Date: 2015-09-07 Impact factor: 5.836
Authors: Ilaria Vittoria De Martini; Thomas Pfammatter; Gilbert Puippe; Pierre-Alain Clavien; Hatem Alkadhi Journal: Eur J Radiol Open Date: 2020-02-12