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題名 | In Vitro Evaluation of an Improved Electrohydraulic Lithotripter=改良之水電式碎石機之體外性能評估 |
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作 者 | 梁勝明; 馬亞尼; 蒲永仁; 蔡文彬; 張建成; | 書刊名 | 遠東學報 |
卷期 | 25:1 2008.03[民97.03] |
頁次 | 頁(I)1-(I)7 |
分類號 | 410.1644 |
關鍵詞 | 電水式碎石機; 震波; 結石追蹤系統; Electrohydraulic lithotripter; Shock waves; Stone-tracking system; |
語文 | 英文(English) |
中文摘要 | 體外震波碎石機(Extracorporeal Shock Wave Lithotripter) 在現今醫療運用相當廣 泛,但一般在療程中大概只有 50%的震波能量會落在結石上,另外 50%的震波能 量落在其他正常組織上。其原因為患者呼吸及患者身體的移動導致結石位置偏移。 本論文採用影像處理及伺服馬達控制的技術,對結石做即時追蹤,讓每次發射出 去的震波都能落在結石上。在影像處理方面由超音波影像,由伺服馬達控制將聚 焦點移動到結石位置,達到定位與即時追蹤的效果。腎臟組織所產生的超音波影 像與結石的影像極為相似,使得結石辨認會發生困難。因此我們對此軟體加以修 正並增加其他辨認條件,結合超音波下結石亮點畫面比對及其下方產生的陰影技 術,二者一起使用來辨認結石。經過不同試驗後,在相符合率試驗中,不追蹤的 結果為 68.8%,舊系統為 89.9%,新系統為 94.3%。在結石破碎有效性試驗中,不 追蹤的結果為 49.5%,舊追蹤系統為 85.1%,新系統為 89.5%。在結石粉碎重量測 試中,不追蹤的結果為 49.1%,舊系統與新系統皆為幾乎 100%,但舊系統的追蹤 平均失敗次數為 22.2 次,新系統為 5.3 次,失敗率各為 0.74%及 0.18%。 |
英文摘要 | Although extracorporeal shock wave lithotripsy has been widely used in hospitals, shock waves administered are not totally focused on a treated stone because of patient’s breath or movement. In order to overcome this problem, the authors used an ultrasound scanner, the servomotor control and image processing technologies to track the treated stone in real time. It was found that the images of some other tissues in kidney are sometimes similar to stone images, resulting in a difficulty for stone identification. To improve the detection problem, we combine the bright region of stone with the stone shadow in ultrasound images for detecting the stone. It is found that the average coincidence ratio for the modified software is improved from 89.9% to 94.3%, the efficiency ratio is improved from 85.1% to 89.5%, and the fragments-to-total-weight ratio retains 100% at a stone-tracking condition. Without a stone-tracking condition, the coincidence ratio is only 68.8%, 49.5% for efficiency ratio, and 49.1% for the fragments-to-total-weight ratio. Moreover, the average number of miss-tracking is reduced from 22.2 to 5.3 times per treatment. The corresponding failure rate is 0.18% for the improved software and 0.74% for the original software. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。