超音波導引型海扶刀使用電腦斷層影像進行品質保證量化分析

研究目的本研究使用原廠品質保證靶模，且遵照原廠品保證過程，給此品質保證設計影像量化的方式，建立其品質保證穩定性及再現性的指標。材料與方法使用高強度聚焦型系統進行品質保證，採用不同瓦數、不同秒數的打靶參數進行打靶作業，分別打二十七顆原廠品質保證把模。使用電腦斷層參數： 120kVp、0.6mm進行電腦斷層掃描，再使用IMAGE J對27顆靶模影像進行分析，觀察影像中空泡形成位置以及大小差異。結果各個不同打靶參數的靶模在電腦斷層影像上觀察到空泡分布情情況不同。發現空泡形成面積與瓦數和秒數有正相關，除了400w2s特例低於所以參數形成的空泡面積。分布位置則是根據各個不同瓦數以及秒數有不同的分布。結論我們利用電腦斷層影像評估靶模，可以準確量化每一次在定量校正的情況下所造成的效果，將來可運用在海扶刀品質保證應用上。關鍵字海扶刀、聚焦型超音波、品質保證、標準靶模

PurposeThere is no standard quantitative quality assurance method for ultrasound guild HIFU. B-mode images only can observe white high-intensity areas, without considering the true extent of damage. The original quality assurance only uses the naked eye to judge the Cavity on the target. The purpose of this research is to use the original quality assurance target and follow the original assurance process to create an image quantification method for this quality assurance for observing the actual damaged area on the target model. Establish indicators of its quality assurance stability and reproducibility.Materials and MethodsUse the High Intensity Focused Ultrasound system for quality assurance, use different wattages and different operation time of target parameters for 27 original quality assurance target models operation. After the target operation, the target models is scanned by computed tomography. computed tomography parameter：120kVp、180mAs、0.6mm slice thickness. Using Image j to analyze target computer tomography, comparison of cavitation peak volume and cavity distribution under different target parameters.Result and discussionDifferent target’s operation parameters on the computer tomography images observed different distribution of cavity. Found cavitation peak volume cavity formation area positive correlation between wattage and seconds, in addition to the 400w2s. Layout position is different distributions according to respective different wattage and seconds.The reason of 400W2s operation parameters cavity formation area low and weak, we thought the machine was not already warm up. Or the machine could not output completely under 400W2s operation parameters.ConclusionWe use computer tomography to evaluate the target model, accurately quantify the effect of each correction in the case of quantitative correction. In the future, it can be used in the quality assurance application.Key word：HIFU、High Intensity Focused Ultrasound、quality assurance、original target