Rectangular and radial region of interests on the edge of cylindrical phantom for spatial resolution measurement

Choirul Anam*, Nazil Ainurrofik, Heri Sutanto, Ariij Naufal, Mohammad Haekal

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The purpose of this study was to evaluate the effect of rectangular region of interest (ROI) size on modulation transfer function (MTF), to develop the radial ROI, and to compare both ROIs performances for MTF measurement using a cylindrical polymethyl methacrylate (PMMA) phantom. The PMMA phantom used in this study was rotated 45°. Four rectangular ROIs and a radial ROI were created to measure the MTF value. The rectangular ROI sizes were 3×41, 21×41, 41×41, and 61×41 pixels; each was placed at upper phantom edge. The radial ROI’s length was 41 pixels and placed at several points in phantom edge. The MTF calculation was automatically conducted using MATLAB. The MTFs from rectangular ROIs and radial ROI were then compared. The comparison of the MTF measurement was also conducted using three different filters. The MTF which used radial ROI was smoother than those of rectangular ROI for all filters. This indicated that radial ROI was more resistant to noise than rectangular ROI. Rectangular ROI with the 41×41 pixels had similar 50% and 10% MTF values with the radial ROI. The MTF value which was obtained using radial ROI is more accurate and robust than those obtained using rectangular ROI.

Original languageEnglish
Pages (from-to)747-754
Number of pages8
JournalIndonesian Journal of Electrical Engineering and Computer Science
Issue number2
Publication statusPublished - Aug 2023


  • Computed tomography Edge spread function Line spread function Modulation transfer function Polymethyl methacrylate phantom


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