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題 名 | 利用減像及重疊技術降低雙能電腦斷層影像之金屬假影=Metal Artifact Reduction by DECT Using Subtraction and Fusion Techniques |
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作 者 | 盧玉龍; 鍾昆賢; 張寶樹; 高一峰; 李榮輝; 楊志明; 李振昌; 趙世裕; | 書刊名 | 中華放射線技術學雜誌 |
卷 期 | 41:1 2017.03[民106.03] |
頁 次 | 頁11-16 |
分類號 | 414.93 |
關鍵詞 | 雙能電腦斷層攝影; 單能; 減像; 融合; 金屬假影; DECT; Monoenergetic; Subtraction; Fusion; Metal artifact; |
語 文 | 中文(Chinese) |
中文摘要 | 臨床上,常會有病患因需要而執行體內金屬固定手術,而金屬假影( metal artifact)常會造成附近軟組織無法診斷的情況。若能有效減少或去除金屬假影的影響,將可減少因假影對臨床診斷所造成之不確定性。因此,若能研究出減少影像假影的方法,將可為臨床診斷提供更多可供判斷的訊息。 SIEMENS的雙能電腦斷層攝影儀(dual-energy computed tomography, DECT)可另外採購具有部分去除假影的軟體,其名稱為 Monoenergetic(單能)。目前已有多篇文章發表,利用該軟體進行影像處理後可有效去除大部分的假影。本研究則是以 DECT執行檢查後所產生的原始影像(raw data),利用執行減像及融合(subtraction and fusion)等後處理技術,重組出更可減少金屬假影之影像。該重組後之影像與以 Monoenergetic所產生的影像以盲測試的方式請放射科主治醫師分析與評分,並加以統計分析以評估何種方式所產生之影像品質較為適當。將經過減像與融合得到之影像與 Monoenergetic各組相關係數影像,以切面厚度 3 mm,並以軸像、冠狀切面來做影像分析比較。請放射科主治醫師評分,並加以分析。確認經處理後的影像,不論是影像品質或監測的影響指數,均可得到較佳的金屬假影去除結果。 |
英文摘要 | Nowadays, computed tomography is innovated into dual-energy technology; a dual-energy computed tomography (DECT) could offer great versatility with simultaneous acquisition of high and low energy datasets. With dual-energy CT, two image datasets are acquired from two different x-ray spectra to satisfy the analysis of energy-dependent changes in the attenuation of different materials. However, when dual-energy CT was performed with fast kilovoltage switching; it reconstructed immediately at the scanner console. These images are not fully corrected for scanner calibration and used only to verify the adequacy of anatomic coverage. Moreover, when patients need to perform the executive body of fixation in clinical routine, the soft tissue images were covered by metal artifacts which would disturb the diagnostic image quality and the therapy planning. Therefore, we initiated this study to find the way to reduce metal artifact in CT images from implanted metal orthopedic devices in patients. “Monoenergetic” (the SOMATOMⓇ Definition Flash and SOMATOM Force) is the software to customize image impression and reduce metal artifacts. According the previous studies, using SIEMENS dual-energy CT with Monoenergetic images, the most of metal artifacts can be reduced and the results. This study proposed to use the post-processing techniques (subtraction and fusion) to re-perform the dual-energy CT image raw data. These recombined results were compared with “Monoenergetic” analysis by Radiology specialist in a blinded experiment. In statistics, Receiver operating characteristic (ROC) curve was used for evaluation. Both of the images, those processed with subtraction and fusion and those obtained from "Monoenergetic" in each group with slice thickness of 3 mm, in axial and coronal section were analyzed and compared. And both of images were scored by radiology specialist. We confirmed that after processed image, both in image quality and monitored index; they had a better result in the removal of metal artifacts. |
本系統中英文摘要資訊取自各篇刊載內容。