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KMID : 0357520160390020193
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Journal of Radiological Science and Technology
2016 Volume.39 No. 2 p.193 ~ p.198
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Evaluation of the Modulation Transfer Function for Computed Tomography by Using American Association Physics Medicine Phantom
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Kim Ki-Won
Choi Kwan-Woo
Jeong Hoi-Woun
Jang Seo-Goo
Kwon Kyung-Tae
Son Soon-Yong
Son Jin-Hyun
Min Jung-Whan
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Abstract
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In clinical computed tomography (CT), regular quality assurance (QA) has been required. This study is to evaluate the MTF for analyzing the spatial resolution using AAPM phantom in CT exam. The dual source somatom definition flash (siemens healthcare, forchheim, Germany), the brilliance 64 (philips medical system Netherlands) and aquilion 64 (toshiba medical system, Japan) were used in this study. The quantitative evaluation was performed using the image J (wayne rasband national institutes of health, USA) and chart method which is measurement of modulation transfer function (MTF). In MTF evaluation, the spatial frequencies corresponding to the 50% MTF for the CT systems were 0.58, 0.28, and 0.59 mm-1, respectively and the 10% MTF for the CT systems were 1.63, 0.89, and 1.21 mm-1, respectively. This study could evaluate the characteristic of spatial resolution of MTF using chart method, suggesting the quantitative evaluation method using the data.
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KEYWORD
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Modulation transfer function (MTF), Spatial resolution (SR)
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