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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 曾雪峰(Snow H. Tseng) | |
| dc.contributor.author | Hong-Yu Su | en |
| dc.contributor.author | 蘇虹瑜 | zh_TW |
| dc.date.accessioned | 2021-06-16T10:34:39Z | - |
| dc.date.available | 2020-07-20 | |
| dc.date.copyright | 2020-07-20 | |
| dc.date.issued | 2020 | |
| dc.date.submitted | 2020-07-02 | |
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/60883 | - |
| dc.description.abstract | 臨床醫學中由於人體組織非肉眼可透視，因此經常使用超聲波作為輔助來判斷醫療針在體內的位置，然而超聲波在針體表面的反射作用限制了超聲波探頭與針之間的角度，進而影響手術的自由度以及誤差。本論文以一種利用雷射誘發漏溢聲波的針定位方式作為基礎進行時域有限差分法模型建構，其原理為使用超聲波導波在針體與組織邊界由於介質不匹配產生的漏溢聲波進行針體位置的計算。模擬中利用聲波控制方程式模擬超聲波之傳遞，使用不同型號之醫療針進行定位誤差運算後，更改針壁厚度與針內徑大小與誤差結果進行對比，觀測針體幾何條件對於定位之影響。研究結果顯示使用的針其針壁厚度較厚時，得到的針定位計算誤差值減小，且針與探測器夾角達26∘時計算誤差值上升幅度增加。 | zh_TW |
| dc.description.abstract | Here we model a needle visualization method based on laser-induced leaky acoustic waves. Guided acoustic waves propagate through the needle and leak into the surrounding medium as leaky acoustic waves which can be detected by the ultrasound (US) transducer. The needle position can be calculated with characteristics of leaky acoustic waves. We analyze the relationship of needle position error and different parameters of needles by employing the two-dimensional finite-difference time domain (FDTD) simulation. It is shown that we get lower needle position error with thicker wall thickness of needle and the insertion angle is up to 26∘. | en |
| dc.description.provenance | Made available in DSpace on 2021-06-16T10:34:39Z (GMT). No. of bitstreams: 1 U0001-0207202001231900.pdf: 2238119 bytes, checksum: b32db1d852d19a88796e14d419014342 (MD5) Previous issue date: 2020 | en |
| dc.description.tableofcontents | 口試委員會審定書 # 誌謝 i 中文摘要 ii ABSTRACT iii 目錄 iv 圖目錄 vi 表目錄 viii Chapter 1 緒論 1 1.1 研究動機 1 1.2 研究目標 4 1.3 論文架構 5 Chapter 2 研究背景 6 2.1 光聲效應 6 2.2 超聲波導波 8 2.3 漏溢聲波 11 2.4 實驗架構 13 Chapter 3 時域有限差分法 14 3.1 中央差分法 14 3.2 馬克士威方程式 17 3.3 時域有限差分法應用於聲波方程式 27 3.4 完美匹配層吸收邊界 32 Chapter 4 模擬結果與分析 35 4.1 模型與參數 35 4.2 醫療針規格對於針定位之影響 44 4.3 感測器與針角度對於針定位之影響 48 Chapter 5 結論與未來展望 51 5.1 結論 51 5.2 未來展望 52 參考文獻 53 | |
| dc.language.iso | zh-TW | |
| dc.subject | 超聲波 | zh_TW |
| dc.subject | 時域有限差分法 | zh_TW |
| dc.subject | 漏溢聲波 | zh_TW |
| dc.subject | 完美匹配層 | zh_TW |
| dc.subject | leaky acoustic waves | en |
| dc.subject | finite-difference time-domain (FDTD) | en |
| dc.subject | perfectly matched layers | en |
| dc.subject | ultrasound | en |
| dc.title | 時域有限差分法分析漏溢聲波之針定位 | zh_TW |
| dc.title | FDTD Analysis of Leaky Acoustic Waves for Needle Positioning | en |
| dc.type | Thesis | |
| dc.date.schoolyear | 108-2 | |
| dc.description.degree | 碩士 | |
| dc.contributor.oralexamcommittee | 陳士元(Shih-Yuan Chen),宋孔彬(Kung-Bin Sung) | |
| dc.subject.keyword | 時域有限差分法,超聲波,漏溢聲波,完美匹配層, | zh_TW |
| dc.subject.keyword | finite-difference time-domain (FDTD),ultrasound,leaky acoustic waves,perfectly matched layers, | en |
| dc.relation.page | 55 | |
| dc.identifier.doi | 10.6342/NTU202001257 | |
| dc.rights.note | 有償授權 | |
| dc.date.accepted | 2020-07-02 | |
| dc.contributor.author-college | 電機資訊學院 | zh_TW |
| dc.contributor.author-dept | 光電工程學研究所 | zh_TW |
| 顯示於系所單位： | 光電工程學研究所 | |
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