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Advisor(s)
Abstract(s)
Purpose: For this study, a phantom was produced to evaluate the influence of kVp and metal suppression on the image quality in CBCT brain imaging containing titanium aneurysm clips. Method and material: A head phantom was constructed comprising of a pig skull with its neurocranium filled with butter to simulate the human brain. CBCT was used to scan the phantom. Three different aneurysm clips were used (two in different sizes and one with a different size and shape). Acquisitions were made using different values of kVp (80, 84, 88, 92, 96). Each acquisition was reconstructed in every anatomical plane, with and without metal suppression. For post-processing, ImageJ was used to place ROIs in specific areas. Standard deviation, representing noise; data was analysed using T-tests. Results: The phantom was suitable for aneurysm implant placement. The noise is most severe in the axial plane (p<0.05) and the larger clips produced more noise. Metal suppression resulted in a significant reduction of noise in all three planes (p<0.05). Compared to metal suppression, the reduction in noise with an increase in kVp is minimal. Conclusion: Metal suppression is effective in reducing metal artefacts in CBCT brain imaging.
Description
Keywords
Radiology Aneurysm clip Artefacts CBCT Image quality Metal suppression Phantom
Citation
Harsaker V, Buttazzoni M, Cardoso A (Ângela), Knijff A, Mookrey T, Safai O, et al. Aneurysm clips in brain imaging using CBCT: the development of a phantom and the influence of kvp and metal suppression on image quality. In: Meijer A, Buissink C, Hogg P, editors. OPTIMAX 2017: optimising image quality for medical image. Oslo: Akershus University College; 2017. p. 93-104.
Publisher
Akershus University College