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題 名 | 評估低劑量電腦斷層檢查最大強度投影技術偵測微小肺結節之效益=The Efficacy of a New Technique of Low Dose Computed Tomography to Detect Small Pulmonary Nodules: Maximum Intensity Projection |
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作 者 | 陳凱錡; 李基訓; 林新傑; 陳名聖; 丘思穎; 賴善鳴; | 書刊名 | 中華放射線技術學雜誌 |
卷 期 | 35:3 2011.09[民100.09] |
頁 次 | 頁194-198 |
分類號 | 416.14 |
關鍵詞 | 低劑量電腦斷層; 橫切面影像; 最大強度投影影像; 肺部結節; 電腦輔助偵測系統; Low dose computed tomography; Transaxial thin slice; Maximum intensity projection; Pulmonary nodule; Computed-aided diagnosis; |
語 文 | 中文(Chinese) |
中文摘要 | 現今低劑量肺部電腦斷層(Low–dose Lung CT;LDCT)廣泛地應用於肺癌的篩檢,但大量的影像導致審閱困難度增加且肺部結節在橫切面影像時與血管結構相似常使得結節不易被偵測出來。本次研究利用320-MDCT掃瞄後所得到的原始資料(Volume Data),重組橫切面影像(Transaxial thin slice;TS)及最大強度投影影像(Maximum intensity projection;MIP )兩種影像來偵測肺部結節並探討MIP技術對於偵測肺部結節的應用價值。本研究取樣對象為55位受檢者,男34位,女19位;年齡20~77歲;將掃描後原始影像以1.0mm及5.0mm切片厚度重組TS影像,另外再將原始影像以10mm厚度重組MIP影像,並由三位放射科醫師利用兩種影像進行肺部結節的評估。將兩者方法所觀看到的肺部結節分別依照結節的總數,密度、大小、位置進行分類,並以t檢定方法分析MIP、TS影像兩種閱片方式的差異以及結節數目、結節大小、密度、位置對兩種閱片方式的影響。根據統計結果,MIP影像偵測總結節數、實質性結節、結節直徑≦4mm以及結節位置緊靠血管和隨機分佈的偵測率皆優於TS影像,且p<0.05具統計意義。因此MIP影像可減少閱片影像數目且提高結節偵測率,但因在偵測非實質性結節時,會有漏診情況,因此當利用MDCT偵測微小結節時,先以MIP影像審閱後再結合TS影像,可提高結節之偵測率並減少漏失,若加上電腦輔助偵測系統(computer-aided diagnosis CAD)綜合判讀,可輔助偵測微小結節。 |
英文摘要 | Nowadays, low dose computed tomography (LDCT) of lung has been widely used in the screening of lung cancer. However, the large number of images increases the difficulty of imaging interpretation. At axial section images, pulmonary nodules are frequently similar to vascular structures and hard to be detected. Our study is based on volume data obtained by 320-MDCT scan for the detection of pulmonary nodules with transaxial thin slice (TS) and maximum intensity projection (MIP), and to evaluate the feasibility of the technique of MIP for to detect pulmonary nodules. Fifty five patients were enrolled in our study, including 34 male and 19 female, age ranged 20 to 77 years. The source images were reformatted to TS images with 1.0 mm and 5.0 mm thickness, and also reformatted to MIP images with 10 mm thickness. Three radiologists participated in the imaging interpretation to check the presence of pulmonary nodules with TS and MIP. With different reformatted methods, the number, density, size and location of the detected pulmonary nodules was classified and analyzed with student t test, to determine if there is significant difference between the two techniques (TS and MIP) for the evaluation of pulmonary nodules, and if the number, size, density and location of pulmonary nodules affects the imaging interpretation with two techniques. With the technique of MIP, the number of totally detected pulmonary nodules, solid nodules, nodules with diameter less than 4 mm, nodules close to vessels, and nodules randomly distributed, was all significantly more than interpretation with the technique of TS (p < 0.05). The technique of MIP can decrease the total number of images for reading, and increase the detection rate of pulmonary nodules. However, there is misdiagnosis for the detection of non-solid nodules with MIP. Therefore, when using MDCT to detect small pulmonary nodule, we recommend interpretation with MIP images first, then combined with TS images, by which way to increase the detection rate of small nodules and avoid misdiagnosis. Furthermore, the information provided by computed-aided diagnosis (CAD) can be helpful to detect small nodule. |
本系統中英文摘要資訊取自各篇刊載內容。