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Evaluation of thresholding techniques on 3D fractal dimension MRI images

Jamaludin, Iqbal and Che Azemin, Mohd Zulfaezal and Musa, Liyana and Sapuan, Abdul HaliM and Abdul Majid, Zafri Azran and Ahmad, Azmir and A. Rahman, Nor Azlina and Sideek, Mohamed Arshad (2017) Evaluation of thresholding techniques on 3D fractal dimension MRI images. Journal of Engineering and Applied Sciences, 12 (Special Issue (3)). pp. 6387-6392. ISSN 1816-949X E-ISSN 1818-7803

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Abstract

Fractal Analysis (FA) application in medical field has been used to measure the occurrence of changes in the brain complexity for some diseased and normal aging brain. Within FA, there is Fractal Dimension (FD) which is an index of structural complexity. FD methods were classified into three major categories which are box-counting method, variance method and spectral method. Here in this study we used box-counting method to measure our FD due to its directness and automatic computability capabilities. We evaluated the impact of different thresholding techniques when quantifying the FD. We applied three different thresholding techniques on our brain MRI images: Otsu’s method, midpoint method and hysteresis method. A total of 27 subjects (14 males and 13 females) aged ranging between 21-25 years old were voluntarily participated. The process of thresholding the images and computation of the FD values were done under MATLAB. There was a statistically significant difference between groups of thresholding techniques as determined by Friedman test with χ(2) = 48.667 and p<0.001. Post-hoc Wilcoxon-signed ranked test with Bonferroni correction done where the p-value was set to 0.017. All three group pairs (midpoint vs. Otsu’s, midpoint vs. hysteresis and hysteresis vs. Otsu’s) were statistically significant different with p<0.001. Pearson’s correlation showed moderate correlation (r = 0.446, p = 0.02) between hysteresis and Otsu’s. Spearman correlation showed weak correlation which is not significant (r = 0.256, p = 0.198) for midpoint vs. Otsu’s and (r = 0.252, p = 0.204) for midpoint vs. hysteresis. In conclusion, different thresholding techniques do have impact on FD values but with moderate correlation between them.

Item Type: Article (Journal)
Additional Information: 6667/61420
Uncontrolled Keywords: Box-counting; Thresholding; Fractal dimension; Brain; Magnetic resonance imaging; Textual memorization
Subjects: Q Science > QA Mathematics > QA75 Electronic computers. Computer science
Q Science > QM Human anatomy
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button): Kulliyyah of Allied Health Sciences > Department of Optometry and Visual Science
Depositing User: Dr. Mohd Zulfaezal Che Azemin
Date Deposited: 16 Jan 2018 10:12
Last Modified: 25 Apr 2018 11:16
URI: http://irep.iium.edu.my/id/eprint/61420

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