Development Of Post-Processing Technique For Metal Artefacts Reduction In The Presence Of Contrast Media In Ct Imaging
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Date
2018-07
Authors
Mohamad Yusob, Nur Diana
Journal Title
Journal ISSN
Volume Title
Publisher
Universiti Sains Malaysia
Abstract
Artefacts arising from metallic implant in CT imaging had been a concern in obtaining an optimal image quality. The objective of this research is to develop the post-processing technique to reduce the severity of metal artefacts from orthopaedic screw in the presence of contrast media in abdominal CT imaging. Identification of CT images within or near metallic implants should be predicted by imaging, the assessment of disease would be refined, allowing better image analysis of patient for early detection and prevention of acute disease events. This study is performed by using a water-based abdomen phantom of diameter 32 cm (adult body size). The phantom is fabricated using PMMA material. The orthopaedic metal screw (stainless steel grade 316L and titanium alloy grade 5) is placed in each small PMMA tube separately. A 100 ml of contrast media (Iodine, Barium and Gadolinium) of Concentration 1 and Concentration 2, is filled in a small PMMA tube and placed inside a body phantom respectively. The fabricated phantom is scanned with single-energy CT (120 kV) and dual-energy CT (80/140 kV). The scan modes are set using Automatic Exposure Control setting and the scans are set at pitch of 0.60 and slice thickness of 1.0, 3.0, and 5.0 mm. The CT image obtained is then post-processed with the metal artefact reduction algorithm proposed. The images before and after applied metal artefact reduction algorithm is then calculated the signal-to-noise ratio. In this phantom study, the usage of contrast media able to improve the accuracy of border delineating organ of interest, exhibit contrast between tissues of interest, and improve visibility of body tissue. Moreover, the proposed metal artefact reduction algorithm is developed to reduce the beam hardening artefact and image noise, and thus improve CT image quality obtained.
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Keywords
Artefacts arising from metallic implant in CT imaging , in obtaining an optimal image quality