Calculation of the modulation transfer function from the square wave response function data with an interactive curve fitting software
Two ways to calculate the modulation transfer function (MTF) of radiographic screen-film systems from the measured square wave response function (SWRF) data were investigated with an interactive curve fitting software. The measured SWRF data obtained by digitising a radiographic image of a bar patte...
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| Format: | Article |
| Language: | English |
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University of Aberdeen, Foresterhill, Aberdeen
2002
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| Online Access: | http://eprints.utm.my/6750/ http://eprints.utm.my/6750/1/Physica_Medica_18_2002_pp25-31.pdf |
| _version_ | 1848891340986777600 |
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| author | Wan Hassan, Wan Muhamad Saridan |
| author_facet | Wan Hassan, Wan Muhamad Saridan |
| author_sort | Wan Hassan, Wan Muhamad Saridan |
| building | UTeM Institutional Repository |
| collection | Online Access |
| description | Two ways to calculate the modulation transfer function (MTF) of radiographic screen-film systems from the measured square wave response function (SWRF) data were investigated with an interactive curve fitting software. The measured SWRF data obtained by digitising a radiographic image of a bar pattern test object were fitted to a curve, and the fitted curve was used to calculate the MTF. Satisfactory MTF was obtained by using 12 terms in the calculation. A second version of the calculation included a correction for the normalization at 0.25 cycles/mm of the SWRF data. Measurements from a screen-film combination showed that the MTF of the first version was higher than the second by an average amount of 0.02 units for spatial range 0-3.5 cycles/mm, and on average the MTF of the first version was higher than the second by 10%. Both the SWRF data fitting and the MTF calculation were done within an interactive curve fitting software which made the calculation relatively easy to perform. |
| first_indexed | 2025-11-15T20:56:25Z |
| format | Article |
| id | utm-6750 |
| institution | Universiti Teknologi Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-15T20:56:25Z |
| publishDate | 2002 |
| publisher | University of Aberdeen, Foresterhill, Aberdeen |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | utm-67502017-05-11T04:44:13Z http://eprints.utm.my/6750/ Calculation of the modulation transfer function from the square wave response function data with an interactive curve fitting software Wan Hassan, Wan Muhamad Saridan QC Physics Two ways to calculate the modulation transfer function (MTF) of radiographic screen-film systems from the measured square wave response function (SWRF) data were investigated with an interactive curve fitting software. The measured SWRF data obtained by digitising a radiographic image of a bar pattern test object were fitted to a curve, and the fitted curve was used to calculate the MTF. Satisfactory MTF was obtained by using 12 terms in the calculation. A second version of the calculation included a correction for the normalization at 0.25 cycles/mm of the SWRF data. Measurements from a screen-film combination showed that the MTF of the first version was higher than the second by an average amount of 0.02 units for spatial range 0-3.5 cycles/mm, and on average the MTF of the first version was higher than the second by 10%. Both the SWRF data fitting and the MTF calculation were done within an interactive curve fitting software which made the calculation relatively easy to perform. University of Aberdeen, Foresterhill, Aberdeen 2002 Article PeerReviewed application/pdf en http://eprints.utm.my/6750/1/Physica_Medica_18_2002_pp25-31.pdf Wan Hassan, Wan Muhamad Saridan (2002) Calculation of the modulation transfer function from the square wave response function data with an interactive curve fitting software. Physica Medica, 18 . pp. 25-31. ISSN 1120-1797 |
| spellingShingle | QC Physics Wan Hassan, Wan Muhamad Saridan Calculation of the modulation transfer function from the square wave response function data with an interactive curve fitting software |
| title | Calculation of the modulation transfer function from the square wave response function data with an interactive curve fitting software |
| title_full | Calculation of the modulation transfer function from the square wave response function data with an interactive curve fitting software |
| title_fullStr | Calculation of the modulation transfer function from the square wave response function data with an interactive curve fitting software |
| title_full_unstemmed | Calculation of the modulation transfer function from the square wave response function data with an interactive curve fitting software |
| title_short | Calculation of the modulation transfer function from the square wave response function data with an interactive curve fitting software |
| title_sort | calculation of the modulation transfer function from the square wave response function data with an interactive curve fitting software |
| topic | QC Physics |
| url | http://eprints.utm.my/6750/ http://eprints.utm.my/6750/1/Physica_Medica_18_2002_pp25-31.pdf |