Acceptance testing of a CT scanner with a knowledge based iterative reconstruction algorithm
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| Formato: | Artículo científico |
| Lenguaje: | es |
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Sociedade Brasileira de Proteção Radiológica - SBPR
2019
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| _version_ | 1876433287202734080 |
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| author | Maryangel Jhoseline Medina |
| author_facet | Maryangel Jhoseline Medina |
| contents | Acceptance testing of a CT scanner with a knowledge based iterative reconstruction algorithm Maryangel Jhoseline Medina Francisco Javier Funes Aley Palau Vanesa María Sanz Mauro Namías Biología CT Acceptance Iterative reconstruction In this paper we present the results obtained during the acceptance tests of a Philips iCT Elite scanner with the iterative model-based IMR reconstruction algorithm. We also analyze the impact on image quality of different reconstruction algorithms available on the scanner (IMR, iDose4 , FBP) for different dose levels. A Catphan® 500 phantom was used for this purpose. RESULTS: The laser positioning system was misaligned, while the gantry and table were aligned. The high-contrast spatial resolution (HCSR) was 21 lp/cm. Regarding low contrast resolution, a 3 mm pin with 0.3% contrast was observed using IMR for CTDIvol = 10.4 mGy, while a 5mm pin was observed using filtered back projection (FBP). Average uniformity was ± 3 Hounsfield Units (HU) and noise was <0.5%. Nominal and measured slice thicknesses were compared, obtaining very similar results. At 120 kVp, the effective energy was 70 keV. CT numbers were measured for different materials, with results in accordance with expected values. IMR reconstructions, when compared with FBP and iDose4 , achieved noise reduction up to 75% and improved low contrast detectability up to 50% without affecting HSCR significantly. CONCLUSIONS: Image quality and general system’s functionality were evaluated, with satisfactory results. The results were taken as a reference for routine quality controls. The IMR reconstruction algorithm resulted in significantly improved low-contrast resolution and lower noise at low doses when compared with FBP. The impact of IMR technology on clinical images remains to be assessed. 2019 artículo científico 2319-0612 https://www.redalyc.org/articulo.oa?id=722280832008 es http://www.redalyc.org/revista.oa?id=7222 Brazilian Journal of Radiation Sciences application/pdf Sociedade Brasileira de Proteção Radiológica - SBPR Brazilian Journal of Radiation Sciences (Brasil) Num.1A Vol.7 |
| format | Artículo científico |
| id | redalyc_722280832008 |
| institution | Redalyc |
| language | es |
| publishDate | 2019 |
| publisher | Sociedade Brasileira de Proteção Radiológica - SBPR |
| spellingShingle | Acceptance testing of a CT scanner with a knowledge based iterative reconstruction algorithm Maryangel Jhoseline Medina Biología CT Acceptance Iterative reconstruction Acceptance testing of a CT scanner with a knowledge based iterative reconstruction algorithm Maryangel Jhoseline Medina Francisco Javier Funes Aley Palau Vanesa María Sanz Mauro Namías Biología CT Acceptance Iterative reconstruction In this paper we present the results obtained during the acceptance tests of a Philips iCT Elite scanner with the iterative model-based IMR reconstruction algorithm. We also analyze the impact on image quality of different reconstruction algorithms available on the scanner (IMR, iDose4 , FBP) for different dose levels. A Catphan® 500 phantom was used for this purpose. RESULTS: The laser positioning system was misaligned, while the gantry and table were aligned. The high-contrast spatial resolution (HCSR) was 21 lp/cm. Regarding low contrast resolution, a 3 mm pin with 0.3% contrast was observed using IMR for CTDIvol = 10.4 mGy, while a 5mm pin was observed using filtered back projection (FBP). Average uniformity was ± 3 Hounsfield Units (HU) and noise was <0.5%. Nominal and measured slice thicknesses were compared, obtaining very similar results. At 120 kVp, the effective energy was 70 keV. CT numbers were measured for different materials, with results in accordance with expected values. IMR reconstructions, when compared with FBP and iDose4 , achieved noise reduction up to 75% and improved low contrast detectability up to 50% without affecting HSCR significantly. CONCLUSIONS: Image quality and general system’s functionality were evaluated, with satisfactory results. The results were taken as a reference for routine quality controls. The IMR reconstruction algorithm resulted in significantly improved low-contrast resolution and lower noise at low doses when compared with FBP. The impact of IMR technology on clinical images remains to be assessed. 2019 artículo científico 2319-0612 https://www.redalyc.org/articulo.oa?id=722280832008 es http://www.redalyc.org/revista.oa?id=7222 Brazilian Journal of Radiation Sciences application/pdf Sociedade Brasileira de Proteção Radiológica - SBPR Brazilian Journal of Radiation Sciences (Brasil) Num.1A Vol.7 |
| title | Acceptance testing of a CT scanner with a knowledge based iterative reconstruction algorithm |
| topic | Biología CT Acceptance Iterative reconstruction |
| url | https://www.redalyc.org/articulo.oa?id=722280832008 |