Optimization of Parameters in 16-slice CT-scan Protocols for Reduction of the Absorbed Dose
Introduction In computed tomography (CT) technology, an optimal radiation dose can be achieved via changing radiation parameters such as mA, pitch factor, rotation time and tube voltage (kVp) for diagnostic images. Materials and Methods In this study, the brain, abdomen, and thorax scaning was perfo...
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Mashhad University of Medical Sciences
2014-08-01
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| Series: | Iranian Journal of Medical Physics |
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| Online Access: | http://ijmp.mums.ac.ir/article_3101_7eb6d1b9d7e59a94070873878d6ed7a3.pdf |
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| author | Shahrokh Naseri Mahdi Momen Nezhad Zahra Hozhabri Abbas Haghparast Golestan Karami Peyman Hejazi |
| author_facet | Shahrokh Naseri Mahdi Momen Nezhad Zahra Hozhabri Abbas Haghparast Golestan Karami Peyman Hejazi |
| author_sort | Shahrokh Naseri |
| collection | DOAJ |
| description | Introduction In computed tomography (CT) technology, an optimal radiation dose can be achieved via changing radiation parameters such as mA, pitch factor, rotation time and tube voltage (kVp) for diagnostic images. Materials and Methods In this study, the brain, abdomen, and thorax scaning was performed using Toshiba 16-slice scannerand standard AAPM and CTDI phantoms. AAPM phantom was used for the measurement of image-related parameters and CTDI phantom was utilized for the calculation of absorbed dose to patients. Imaging parameters including mA (50-400 mA), pitch factor (1 and 1.5) and rotation time (range of 0.5, 0.75, 1, 1.5 and 2 seconds) were considered as independent variables. The brain, abdomen and chest imaging was performed multi-slice and spiral modes. Changes in image quality parameters including contrast resolution (CR) and spatial resolution (SR) in each condition were measured and determined by MATLAB software. Results After normalizing data by plotting the full width at half maximum (FWHM) of point spread function (PSF) in each condition, it was observed that image quality was not noticeably affected by each cases. Therefore, in brain scan, the lowest patient dose was in 150 mA and rotation time of 1.5 seconds. Based on results of scanning of the abdomen and chest, the lowest patient dose was obtained by 100 mA and pitch factors of 1 and 1.5. Conclusion It was found that images with acceptable quality and reliable detection ability could be obtained using smaller doses of radiation, compared to protocols commonly used by operators. |
| first_indexed | 2024-12-10T18:30:41Z |
| format | Article |
| id | doaj.art-a279b65c1ab7490b8602f2ea022f7450 |
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| issn | 2345-3672 2345-3672 |
| language | English |
| last_indexed | 2024-12-10T18:30:41Z |
| publishDate | 2014-08-01 |
| publisher | Mashhad University of Medical Sciences |
| record_format | Article |
| series | Iranian Journal of Medical Physics |
| spelling | doaj.art-a279b65c1ab7490b8602f2ea022f74502022-12-22T01:37:57ZengMashhad University of Medical SciencesIranian Journal of Medical Physics2345-36722345-36722014-08-0111Issue 2,327027510.22038/ijmp.2014.31013101Optimization of Parameters in 16-slice CT-scan Protocols for Reduction of the Absorbed DoseShahrokh Naseri0Mahdi Momen Nezhad1Zahra Hozhabri2Abbas Haghparast3Golestan Karami4Peyman Hejazi5Medical Physics Dept., Mashhad University of Medical Sciences, Mashhad,IranMedical Physics Dept., Mashhad University of Medical Sciences, Mashhad,IranMedical Physics Dept., Kermanshah University of Medical Sciences, Kermanshah,IranMedical Physics Dept., Kermanshah University of Medical Sciences, Kermanshah,IranMedical Physics Dept., Kermanshah University of Medical Sciences, Kermanshah,IranMedical Physics Dept., Semnan University of Medical Sciences, Semnan, IranIntroduction In computed tomography (CT) technology, an optimal radiation dose can be achieved via changing radiation parameters such as mA, pitch factor, rotation time and tube voltage (kVp) for diagnostic images. Materials and Methods In this study, the brain, abdomen, and thorax scaning was performed using Toshiba 16-slice scannerand standard AAPM and CTDI phantoms. AAPM phantom was used for the measurement of image-related parameters and CTDI phantom was utilized for the calculation of absorbed dose to patients. Imaging parameters including mA (50-400 mA), pitch factor (1 and 1.5) and rotation time (range of 0.5, 0.75, 1, 1.5 and 2 seconds) were considered as independent variables. The brain, abdomen and chest imaging was performed multi-slice and spiral modes. Changes in image quality parameters including contrast resolution (CR) and spatial resolution (SR) in each condition were measured and determined by MATLAB software. Results After normalizing data by plotting the full width at half maximum (FWHM) of point spread function (PSF) in each condition, it was observed that image quality was not noticeably affected by each cases. Therefore, in brain scan, the lowest patient dose was in 150 mA and rotation time of 1.5 seconds. Based on results of scanning of the abdomen and chest, the lowest patient dose was obtained by 100 mA and pitch factors of 1 and 1.5. Conclusion It was found that images with acceptable quality and reliable detection ability could be obtained using smaller doses of radiation, compared to protocols commonly used by operators.http://ijmp.mums.ac.ir/article_3101_7eb6d1b9d7e59a94070873878d6ed7a3.pdfComputed Tomography (CT)Absorbed DoseOptimization |
| spellingShingle | Shahrokh Naseri Mahdi Momen Nezhad Zahra Hozhabri Abbas Haghparast Golestan Karami Peyman Hejazi Optimization of Parameters in 16-slice CT-scan Protocols for Reduction of the Absorbed Dose Iranian Journal of Medical Physics Computed Tomography (CT) Absorbed Dose Optimization |
| title | Optimization of Parameters in 16-slice CT-scan Protocols for Reduction of the Absorbed Dose |
| title_full | Optimization of Parameters in 16-slice CT-scan Protocols for Reduction of the Absorbed Dose |
| title_fullStr | Optimization of Parameters in 16-slice CT-scan Protocols for Reduction of the Absorbed Dose |
| title_full_unstemmed | Optimization of Parameters in 16-slice CT-scan Protocols for Reduction of the Absorbed Dose |
| title_short | Optimization of Parameters in 16-slice CT-scan Protocols for Reduction of the Absorbed Dose |
| title_sort | optimization of parameters in 16 slice ct scan protocols for reduction of the absorbed dose |
| topic | Computed Tomography (CT) Absorbed Dose Optimization |
| url | http://ijmp.mums.ac.ir/article_3101_7eb6d1b9d7e59a94070873878d6ed7a3.pdf |
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