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Factors affecting modulation transfer function measurements in cone-beam computed tomographic images

PURPOSE: This study was designed to investigate the effects of voxel size, the oversampling technique, and the direction and area of measurement on modulation transfer function (MTF) values to identify the optimal method of MTF measurement. MATERIALS AND METHODS: Images of the wire inserts of the Se...

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Autor principal: Choi, Jin-Woo
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Korean Academy of Oral and Maxillofacial Radiology 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6597368/
https://www.ncbi.nlm.nih.gov/pubmed/31281790
http://dx.doi.org/10.5624/isd.2019.49.2.131
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author Choi, Jin-Woo
author_facet Choi, Jin-Woo
author_sort Choi, Jin-Woo
collection PubMed
description PURPOSE: This study was designed to investigate the effects of voxel size, the oversampling technique, and the direction and area of measurement on modulation transfer function (MTF) values to identify the optimal method of MTF measurement. MATERIALS AND METHODS: Images of the wire inserts of the SedentexCT IQ phantom were acquired, and MTF values were calculated under different conditions (voxel size of 0.1, 0.2, and 0.3 mm; 5 oversampling techniques; simulated pixel location errors; and different directions and areas of measurement). The differences in the MTF values across various conditions were evaluated. RESULTS: The MTF 10 values showed smaller standard deviations than the MTF 50 values. Stable and accurate MTF values were obtained in the 0.1-mm voxel images. In the 0.3-mm voxel images, oversampling techniques of 11 lines or more did not show significant differences in MTF values depending on the presence of simulated location errors. MTF 10 values showed significant differences according to the direction and area of the measurement. CONCLUSION: To measure more accurate and stable MTF values, it is better to measure MTF 10 values in small-voxel images. In large-voxel images, the proper oversampling technique is required. MTF values from the radial and tangential directions may be different, and MTF values vary depending on the measured area.
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spelling pubmed-65973682019-07-05 Factors affecting modulation transfer function measurements in cone-beam computed tomographic images Choi, Jin-Woo Imaging Sci Dent Original Article PURPOSE: This study was designed to investigate the effects of voxel size, the oversampling technique, and the direction and area of measurement on modulation transfer function (MTF) values to identify the optimal method of MTF measurement. MATERIALS AND METHODS: Images of the wire inserts of the SedentexCT IQ phantom were acquired, and MTF values were calculated under different conditions (voxel size of 0.1, 0.2, and 0.3 mm; 5 oversampling techniques; simulated pixel location errors; and different directions and areas of measurement). The differences in the MTF values across various conditions were evaluated. RESULTS: The MTF 10 values showed smaller standard deviations than the MTF 50 values. Stable and accurate MTF values were obtained in the 0.1-mm voxel images. In the 0.3-mm voxel images, oversampling techniques of 11 lines or more did not show significant differences in MTF values depending on the presence of simulated location errors. MTF 10 values showed significant differences according to the direction and area of the measurement. CONCLUSION: To measure more accurate and stable MTF values, it is better to measure MTF 10 values in small-voxel images. In large-voxel images, the proper oversampling technique is required. MTF values from the radial and tangential directions may be different, and MTF values vary depending on the measured area. Korean Academy of Oral and Maxillofacial Radiology 2019-06 2019-06-24 /pmc/articles/PMC6597368/ /pubmed/31281790 http://dx.doi.org/10.5624/isd.2019.49.2.131 Text en Copyright © 2019 by Korean Academy of Oral and Maxillofacial Radiology http://creativecommons.org/licenses/by-nc/3.0/ This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Original Article
Choi, Jin-Woo
Factors affecting modulation transfer function measurements in cone-beam computed tomographic images
title Factors affecting modulation transfer function measurements in cone-beam computed tomographic images
title_full Factors affecting modulation transfer function measurements in cone-beam computed tomographic images
title_fullStr Factors affecting modulation transfer function measurements in cone-beam computed tomographic images
title_full_unstemmed Factors affecting modulation transfer function measurements in cone-beam computed tomographic images
title_short Factors affecting modulation transfer function measurements in cone-beam computed tomographic images
title_sort factors affecting modulation transfer function measurements in cone-beam computed tomographic images
topic Original Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6597368/
https://www.ncbi.nlm.nih.gov/pubmed/31281790
http://dx.doi.org/10.5624/isd.2019.49.2.131
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