Automated MTF measurement in CT images with a simple wire phantom

• Autorzy: Anam Choirul , Fujibuchi Toshioh , Haryanto Freddy , Budi Wahyu Setia , Sutanto Heri , Adi Kusworo , Muhlisin Zaenul , Dougherty Geoff

Identyfikatory

DOI

10.2478/pjmpe-2019-0024

• Języki publikacji: EN

Abstrakty

EN

This study developed a simple wire phantom and an algorithm to automatically measure the modulation transfer function (MTF) in computed tomography (CT) and implemented it to evaluate the effect of focal spot size and reconstruction filter type. The phantom consisted of a resin cylinder filled with water, with a tin wire of diameter 0.1 mm positioned along the center of the cylinder. The automated MTF algorithm used an axial image of the phantom and comprised several steps. The center position of a region of interest (ROI) was automatically determined at the center of the wire image. The pixels were then summed along the y-direction to obtain the profile of the pixel values at a point along the x-direction. Following this, both edges of the profile were made equal to zero. The profile curve was then normalized so that the total of all the data was equal to unity. The normalized profile curve is the line spread function (LSF), and the MTF curve was obtained by taking its Fourier transform. Our system (phantom and algorithm) is able to differentiate the MTFs of CT images from different focal sizes and reconstruction filter types.

Słowa kluczowe

EN

modulation transfer function; MTF; spatial resolution; simple phantom; image quality; CT scan

• Wydawca: Polskie Towarzystwo Fizyki Medycznej ; De Gruyter
• Czasopismo: Polish Journal of Medical Physics and Engineering
• Rocznik: 2019
• Tom: Vol. 25, Iss. 3
• Strony: 179--187
• Opis fizyczny: Bibliogr. 37 poz., rys., tab.

Twórcy

autor

Anam Choirul

• Department of Physics, Faculty of Mathematics and Natural Sciences, Diponegoro University, 50275, Semarang, Indonesia

autor

Fujibuchi Toshioh

• Department of Health Sciences, Faculty of Medical Sciences, Kyushu University, 812-8582, Fukuoka, Japan

autor

Haryanto Freddy

• Department of Physics, Faculty of Mathematics and Natural Sciences, Bandung Institute of Technology, 40132, Bandung, Indonesia

autor

Budi Wahyu Setia

• Department of Physics, Faculty of Mathematics and Natural Sciences, Diponegoro University, 50275, Semarang, Indonesia

autor

Sutanto Heri

• Department of Physics, Faculty of Mathematics and Natural Sciences, Diponegoro University, 50275, Semarang, Indonesia

autor

Adi Kusworo

• Department of Physics, Faculty of Mathematics and Natural Sciences, Diponegoro University, 50275, Semarang, Indonesia

autor

Muhlisin Zaenul

• Department of Physics, Faculty of Mathematics and Natural Sciences, Diponegoro University, 50275, Semarang, Indonesia

autor

Dougherty Geoff

• Department of Applied Physics and Medical Imaging, California State University Channel Islands, CA 93012, Camarillo

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2020).