Comparison of selected photon shield and organ-based tube current modulation for radiation dose reduction in head computed tomography: A phantom study
| Autor: | Zilong Yuan, Tao Liu, Biao Zhang, Jiaxing Wu, Yaoyao He, Tiao Chen, Zhaoxi Zhang, Cuiling Li, Yulin Liu |
|---|---|
| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Journal of X-Ray Science and Technology. :1-12 |
| ISSN: | 1095-9114 0895-3996 |
| DOI: | 10.3233/xst-230018 |
| Popis: | OBJECTIVE: The aim of this study is to investigate the radiation dose and image quality of head CT using SPS and OBTCM techniques. METHODS: Three anthropomorphic head phantoms (1-yr-old, 5-yr-old, and adult) were used. Images were acquired using four modes (Default protocol, OBTCM, SPS, and SPS+OBTCM). Absorbed dose to the lens, anterior brain (brain_A), and posterior brain (brain_P) was measured and compared. Image noise and CNR were assessed in the selected regions of interest (ROIs). RESULTS: Compared with that in the Default protocol, the absorbed dose to the lens reduced by up to 28.33%,71.38%, and 71.12% in OBTCM, SPS, and SPS+OBTCM, respectively. The noise level in OBTCM slightly (≤1.45HU) increased than that in Default protocol, and the SPS or SPS+OBTCM mode resulted in a quantitatively small increase (≤2.58HU) in three phantoms. There was no significant difference in CNR of different phantoms under varies scanning modes (p > 0.05). CONCLUSIONS: During head CT examinations, the SPS mode can reduce the radiation dose while maintaining image quality. SPS+OBTCM couldn’t further effectively reduce the absorbed dose to the lens for 1-yr and 5-yr-old phantoms. Thus, SPS mode in pediatric and SPS+OBTCM mode in adult are better than other modes, and should be used in clinical practice. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|