The application of automatic tube current modulation (ATCM) on image quality and radiation dose at abdominal computed tomography (CT): A phantom study
| Autor: | Shichao Feng, Ying Zhu, Jun-feng Song, Ning Guo, Weiwei Qi, Yuan Liang, Jian-xin Liu, Qian Wang, Xinming Zhao, Xiaoying Wang, Mancang Hu, Chun-wu Zhou, Nan Hong, Jing Wu |
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| Rok vydání: | 2013 |
| Předmět: |
Radiography
Abdominal medicine.medical_specialty Image quality Radiation Dosage Imaging phantom Tube current modulation Image Processing Computer-Assisted medicine Humans Radiology Nuclear Medicine and imaging Electrical and Electronic Engineering Instrumentation Radiation Phantoms Imaging business.industry Radiation dose Condensed Matter Physics Abdomen ct Spiral computed tomography medicine.anatomical_structure Abdomen Radiology Abdominal computed tomography Tomography X-Ray Computed business Nuclear medicine Algorithms |
| Zdroj: | Journal of X-Ray Science and Technology. 21:453-464 |
| ISSN: | 0895-3996 |
| DOI: | 10.3233/xst-130403 |
| Popis: | Multi-phase spiral Computed tomography (CT) of abdomen has been widely used as an effective imaging modality to diagnose variety of diseases. As a result, the accumulated radiation exposure on the abdomen is substantially higher than other human organ regions. According to ALARA (as low as reasonably achievable) principle, how to control radiation dose without compromising imaging quality becomes a research topic of high interest. However, how to achieve dose optimization of the abdomen CT examinations in Chinese patients have not been fully investigated in previous studies. In this study, we develop an abdomen-equivalent tissue model made by well-known CTP579 auxiliary testing model and the real CT data acquired from 68 Chinese male subjects. Combining with catphan600, we simulated the visibility of low and high contrast objects at adult abdomen under variety of x-ray dose levels. Using the automatic tube current modulation (ATCM) technique, we reduced the total radiation dose and identified a proper noise index (NI) for Chinese patients to maintain low or high contrast detectability of abdominal CT image. Our numerical experiments showed that in the phantom study for Chinese patients, when a NI was set at 10, the radiation dose reduced by 34.3% with low contrast objects detectable, while setting NI at 14 the dose level decreased by 65.1% without change the detectability of high contrast targets. The subjective ratings from three radiologists also yielded high consistence with Kappa > 0.75. This study demonstrated the feasibility of performing the CT dose optimization studies through a unique phantom with the ATCM method. |
| Databáze: | OpenAIRE |
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