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- W3035918986 abstract "Abstract We have developed an improved method of modulation transfer function (MTF) measurement using an edge of the polymethyl methacrylate (PMMA) phantom which is normally positioned for computed tomography dose index (CTDI) measurement. In CTDI measurements, the peripheral holes of the PMMA phantom are set at the 3, 6, 9 and 12 o’clock positions. The upper edge of the phantom image has a hole, which precludes its use in calculating the MTF. To circumvent this, the phantom image was homogenized by replacing all pixel values inside the phantom with the median value of the phantom pixels. Subsequently, we were able to calculate the MTF by measuring the edge spread function (ESF) curve, calculate the line spread function (LSF) curve, and obtain the MTF curve by Fourier transform. The resulting MTF curve using our proposed method was then compared with the tail replacement method which had been proposed previously. Our method is superior to the tail replacement method which results in some inhomogeneity of the ESF curve in the part inside the phantom." @default.
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- W3035918986 date "2020-03-01" @default.
- W3035918986 modified "2023-09-26" @default.
- W3035918986 title "An improvement in automatic MTF measurement in CT images using an edge of the PMMA phantom" @default.
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- W3035918986 doi "https://doi.org/10.1088/1742-6596/1505/1/012039" @default.
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