Utilization of upper and lower limits of exposure index in clinical digital radiography
© 2022. The Author(s), under exclusive licence to Japanese Society of Radiological Technology and Japan Society of Medical Physics..
In many digital X-ray imaging systems, although air kerma on a surface of each detector is used, a standardized dose index called an exposure index (EI) has been proposed by the IEC, which is expected to be utilized for dose management. In clinical practices, EI is effectively utilized using a deviation index (DI), which is a deviation between a target EI (EIT) set for each imaging region and an EIT of the acquired image. However, an important issue in clinical uses of EI is a suppression of excessive doses. It is difficult to achieve a reliable reduction in exposure doses by indicating DI. In this study, physical image characteristics of detectors, visual detectability by charts, and observer experiments using a chest phantom were examined to determine upper (DImax) and lower (DImin) limits of the EIT and DI to achieve a reliable dose reduction in chest examinations. As the result, the tolerance ranges indicated by DImax and DImin, which were set based on the results of physical and visual evaluations, proved to be almost consistent with the distribution of EI values in 735 clinical images taken with a photo-timer control in real clinical practices.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2022 |
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| Erschienen: |
2022 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:15 |
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| Enthalten in: |
Radiological physics and technology - 15(2022), 4 vom: 21. Dez., Seite 349-357 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Funahashi, Masao [VerfasserIn] |
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| Links: |
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| Themen: |
Deviation index |
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| Anmerkungen: |
Date Completed 29.11.2022 Date Revised 29.11.2022 published: Print-Electronic Citation Status MEDLINE |
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| doi: |
10.1007/s12194-022-00674-2 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
NLM345542983 |
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| 100 | 1 | |a Funahashi, Masao |e verfasserin |4 aut | |
| 245 | 1 | 0 | |a Utilization of upper and lower limits of exposure index in clinical digital radiography |
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| 500 | |a Citation Status MEDLINE | ||
| 520 | |a © 2022. The Author(s), under exclusive licence to Japanese Society of Radiological Technology and Japan Society of Medical Physics. | ||
| 520 | |a In many digital X-ray imaging systems, although air kerma on a surface of each detector is used, a standardized dose index called an exposure index (EI) has been proposed by the IEC, which is expected to be utilized for dose management. In clinical practices, EI is effectively utilized using a deviation index (DI), which is a deviation between a target EI (EIT) set for each imaging region and an EIT of the acquired image. However, an important issue in clinical uses of EI is a suppression of excessive doses. It is difficult to achieve a reliable reduction in exposure doses by indicating DI. In this study, physical image characteristics of detectors, visual detectability by charts, and observer experiments using a chest phantom were examined to determine upper (DImax) and lower (DImin) limits of the EIT and DI to achieve a reliable dose reduction in chest examinations. As the result, the tolerance ranges indicated by DImax and DImin, which were set based on the results of physical and visual evaluations, proved to be almost consistent with the distribution of EI values in 735 clinical images taken with a photo-timer control in real clinical practices | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a Deviation index | |
| 650 | 4 | |a Digital radiography | |
| 650 | 4 | |a Dose optimization | |
| 650 | 4 | |a Exposure dose | |
| 650 | 4 | |a Exposure index | |
| 650 | 4 | |a Target exposure index | |
| 700 | 1 | |a Kashiyama, Kazuyuki |e verfasserin |4 aut | |
| 700 | 1 | |a Nakamura, Tomomi |e verfasserin |4 aut | |
| 700 | 1 | |a Shiraishi, Junji |e verfasserin |4 aut | |
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