Segmentation of Extrapulmonary Tuberculosis Infection Using Modified Automatic Seeded Region Growing |
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Authors: | Iman Avazpour M Iqbal Saripan Abdul Jalil Nordin Raja Syamsul Azmir Raja Abdullah |
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Institution: | (1) Department of Computer and Communication, Faculty of Engineering, Universiti Putra Malaysia, 43400 Serdang, Malaysia;(2) Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, 43400 Serdang, Malaysia |
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Abstract: | In the image segmentation process of positron emission tomography combined with computed tomography (PET/CT) imaging, previous
works used information in CT only for segmenting the image without utilizing the information that can be provided by PET.
This paper proposes to utilize the hot spot values in PET to guide the segmentation in CT, in automatic image segmentation
using seeded region growing (SRG) technique. This automatic segmentation routine can be used as part of automatic diagnostic
tools. In addition to the original initial seed selection using hot spot values in PET, this paper also introduces a new SRG
growing criterion, the sliding windows. Fourteen images of patients having extrapulmonary tuberculosis have been examined
using the above-mentioned method. To evaluate the performance of the modified SRG, three fidelity criteria are measured: percentage
of under-segmentation area, percentage of over-segmentation area, and average time consumption. In terms of the under-segmentation
percentage, SRG with average of the region growing criterion shows the least error percentage (51.85%). Meanwhile, SRG with
local averaging and variance yielded the best results (2.67%) for the over-segmentation percentage. In terms of the time complexity,
the modified SRG with local averaging and variance growing criterion shows the best performance with 5.273 s average execution
time. The results indicate that the proposed methods yield fairly good performance in terms of the over- and under-segmentation
area. The results also demonstrated that the hot spot values in PET can be used to guide the automatic segmentation in CT
image. |
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Keywords: | |
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