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頁籤選單縮合
題名 | Low-dose Three-dimensional CT of Paranasal Sinuses=應用低劑量三度空間電腦斷層的副鼻竇檢查 |
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作者姓名(中文) | 陳良光; 蔡裕豐; 劉柏麟; 林清禧; 盧建利; 蕭安成; 蔡忠宏; 曾明宗; 呂坤木; 蘇誠道; 姚敏思; | 書刊名 | 中華放射線醫學雜誌 |
卷期 | 29:1 2004.02[民93.02] |
頁次 | 頁7-13 |
分類號 | 416.87 |
關鍵詞 | 三度空間電腦斷層; 合理抑低; 副鼻竇; 空間解析度; 3D CT; ALARA; Paranasal sinuses; Spatial resolution; |
語文 | 英文(English) |
中文摘要 | 本文研究的目的是想利用低劑量的三度空間電腦斷層攝影,於副鼻竇檢查的病患中取得吸收劑量與影像的品質取其平衡點。並可提供更多的影像資訊給放射科或耳鼻喉科醫師等做影像之判讀、治療前的計劃和手術風險之評估。 本研究以丙烯酸甲酯假體(plexiglas phantom)、水假體(water phantom)去分析各組不同mAs所造成的空間解析度及雜訊,另外用人形假體(Rando phantom)去測量相同掃描範圍,不同的切片厚度(slice thickness)及間隔下的電腦斷層劑量指標(Computed Tomography Dose Index、CTDI)值,並由多個掃描平均劑量(Multiplescan average dose、MSAD)的觀念計算病人所接受的劑量。同時我們於2001年7月至2002年1月共收集19名病患接受副鼻竇電腦斷層攝影之檢查,其中男性14名女性5名。 研究結果:軸狀及冠狀面分別以90mAs、77mAs為醫師可接受影像品質的掃描條件,三度空間影像部份還可以做表面陰影顯呈(Shaded Surface Display、SSD)、多平面重組(Multiplanar Reformats、MPR)、最大強度投射(Maximum Intensity Projection、MIP)提供給放射科或臨床醫師做參考,而劑量部份,還可以讓病人接受較少的吸收劑量以達到合理抑低(ALARA)的精神! |
英文摘要 | The goal of this study was to develop an optimal radiologic techniques for low-dose 3D CT of paranasal sinus to enhance the image quality in a reasonable absorbed x-ray dose for the patients. The ultimate aim is to provide higher quality images for physicians to identify pathological changes from the image, to make preoperative planning, to evaluate the risk of the operation of paranasal sinus and to minimize the occurrence of intra-operative complications. We analyzed spatial resolution and noise signals generated by various groups of mAs by using the dual technique of Plexiglas phantom and water phantom. In addition, Rando phantom was used to measure CTDI (computed tomography dose index) in the same scan area in a function of different slice thicknesses and spacings. The concept of MSAD (Multiple- scan average dose) was applied to calcu-late patient’s absorbed dose. From July 2001 to January 2002, 19 patients were enrolled in the study and underwent CT examinations of paranasal sinuses. Among these patients, 19 were male and 5 female. Conventional 2D CT had been generally used with satisfactory results, especially for patients with chronic paransal sinusitis. However, 3D CT not only provides a better anatomical information of the paranasal sinuses but also follows the ALARA principle. The acceptable image quality could be achieved under the imaging parameters of 90 mAs and 77 mAs for axial and coronal sections, respectively. Three-dimension images could further be analyzed with SSD (shaded surface display), MPR (multi-planar reformats), and MIP (maximum intensity projection) to provide more information for both radiologists and clinicians. |
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