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Geometric distortion evaluation using a multi-orientated water-phantom at 0.2 T MRI

Issue title: Frontiers in Biomedical Engineering and Biotechnology – Proceedings of the 4th International Conference on Biomedical Engineering and Biotechnology, 18–21 August 2015, Shanghai, China

Guest editors: Feng Liu, Dong-Hoon Lee, Ricardo Lagoa and Sandeep Kumar

Article type: Research Article

Authors: Jao, Jochia | Cheng, Mingyeb | Lee, Hsintienb | Ting, Juliusb | Chen, Pochouc; *

Affiliations: [a] Department of Medical Imaging and Radiological Sciences, College of Health Sciences, Kaohsiung Medical University, 100, Shih-Chuan First Rd., Kaohsiung City, 80708, Taiwan, R.O.C. | [b] Department of Radiology, Antai Medical Care Cooperation Antai Tian-Sheng Memorial Hospital, No.210, Sec. 1, Zhongzheng Rd., Donggang Township, Pingtung County 928, Taiwan, R.O.C. | [c] Department of Biomedical Engineering, I-Shou University, No.8, Yida Rd., Jiaosu Village Yanchao District, Kaohsiung City, 82445, Taiwan, R.O.C.

Correspondence: [*] Address for correspondence: Pochou Chen, Department of Biomedical Engineering, I-Shou University, No.8, Yida Rd., Jiaosu Village Yanchao District, Kaohsiung City, 82445, Taiwan, R.O.C. Tel.: +886937633143; Fax: +886761515150; E-mail: [email protected].

Keywords: Geometric distortion, field inhomogeneity, off-center field, multi-orientated water-phantom

DOI: 10.3233/BME-151441

Journal: Bio-Medical Materials and Engineering, vol. 26, no. s1, pp. S1431-S1438, 2015

Published: 2015
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Magnetic Resonance Imaging (MRI) has been one of the most revolutionary medical imaging modalities in the past three decades. It has been recognized as a potential technique in the clinical diagnosis of diseases as well as tumor differentiation. Although MRI has now become the preferred choice in many clinical examinations, there are some drawbacks, which still limit its applications. One of the crucial issues of MRI is the geometric distortion caused by magnetic field inhomogeneity and susceptibility effects. The farther the lesion from the center of a magnetic field (off-center field), the more severe the distortion becomes, especially in low-field MRI. Hence, it might hinder the diagnosis and characterization of lesions in the presence of field inhomogeneity. In this study, an innovative multi-orientated water-phantom was used to evaluate the geometric distortion. The correlations between the level of image distortion and the relative off-center positions, as well as the variation of signal intensities, were both investigated. The image distortion ratios of axial, coronal and sagittal images were calculated.

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