Evaluation of efficacy of metal artefact reduction technique using contrast media in Computed Tomography

10th International Seminar on Medical Physics; 1st AMDI International Oncology Symposium

物理学;医药卫生

Yusob, Diana^1 ; Zukhi, Jihan^1 ; Tajuddin, Abd Aziz^2 ; Zainon, Rafidah^1

Oncological and Radiological Sciences Cluster, Advanced Medical and Dental Institute, Universiti Sains Malaysia, Bertam, Kepala Batas, Pulau Pinang

13200, Malaysia^1

School of Physics, Universiti Sains Malaysia, Pulau Pinang

11800, Malaysia^2

关键词: Clinical application;    Contrast agent;    Current modulation;    Diagnostic performance;    Dual-energy CT;    Imaging protocol;    Metal artefacts;    Slice thickness;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/851/1/012009/pdf
DOI  :  10.1088/1742-6596/851/1/012009

学科分类：卫生学

来源: IOP

【 摘 要 】

The aim of this study was to evaluate the efficacy of metal artefact reduction using contrasts media in Computed Tomography (CT) imaging. A water-based abdomen phantom of diameter 32 cm (adult body size) was fabricated using polymethyl methacrylate (PMMA) material. Three different contrast agents (iodine, barium and gadolinium) were filled in small PMMA tubes and placed inside a water-based PMMA adult abdomen phantom. The orthopedic metal screw was placed in each small PMMA tube separately. These two types of orthopedic metal screw (stainless steel and titanium alloy) were scanned separately. The orthopedic metal crews were scanned with single-energy CT at 120 kV and dual-energy CT at fast kV-switching between 80 kV and 140 kV. The scan modes were set automatically using the current modulation care4Dose setting and the scans were set at different pitch and slice thickness. The use of the contrast media technique on orthopedic metal screws were optimised by using pitch = 0.60 mm, and slice thickness = 5.0 mm. The use contrast media can reduce the metal streaking artefacts on CT image, enhance the CT images surrounding the implants, and it has potential use in improving diagnostic performance in patients with severe metallic artefacts. These results are valuable for imaging protocol optimisation in clinical applications.