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| Selecting Kilovolts to Reduce the Radiation Dose of CT-Guided Radiofrequency Ablation for Liver Tumors Based on BMI |
| ZHAO Junlu, NIE Guanwei, LIU Chong, et al |
| The First Hospital, Hebei Medical University, Hebei Shijiazhuang 050031, China |
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Abstract Objective: To explore the effect of selecting kilovolts based on body mass index (BMI) on reducing the radiation dose of radiofrequency ablation in liver tumors under CT guidance. Methods: CT-guided RFA for hepatic ablations performed from January 1, 2019, through December 31, 2019, were retrospectively reviewed (55 men and 45 women; aged, 29~90 years). The radiation dose was recorded during each of the following steps: planning, performing, and postprocedure. BMI-based protocol modification changes in tube voltage and tube current were then applied to hepatic ablations performed subsequently (52 men and 48 women; aged 30~91 years). Image quality and overall operator satisfaction were noted for each case (score, 1~5). Dose reduction after modification was then calculated. Results: Retrospective analysis found a mean (± SD) overall CT dose index (CTDI) for CT-guided RFA to be 12.83±3.78mGy. After protocol modification, the mean CTDI decreased to 3.84 ±2.24 mGy, a 70.07% reduction overall. The image quality was slightly lower compared to before the modification, but the image quality in both stages met the needs of CT-guided radiofrequency ablation for liver tumors. The difference between electrode needle display and operator confidence satisfaction was not statistically significant (P> 0.05). Conclusion: BMI-based kilovolt modifications can significantly reduce the radiation dose during CT-guided percutaneous liver tumor ablation without significantly sacrificing image quality.
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2023, Vol. 29 
