【摘要】：一、下肢動脈病變能譜CTA圖像后處理中最佳單能量圖像的選擇 目的：探討利用最佳對比噪聲比選擇一個最理想的keV單能量圖像對提高下肢動脈CTA圖像質(zhì)量的應(yīng)用價值。 方法：收集我院2010年5月至2012年7月,臨床擬診為下肢動脈病變的患者96例,其中男性44例,女性52例,狹窄程度1級13例、2級12例、3級29例、4級26例、5級16例。采用GE Discovaery750寶石能譜CT,掃描范圍從臍下至足底,所有病例均經(jīng)DSA確診。圖像后處理采用儀器自備ADW4.4以及GSI-view軟件進行重建,在單能量橫斷面圖像上測量最佳CNR。根據(jù)Ota等對下肢動脈的分段方法,分別在QC圖像、系統(tǒng)默認keV以及利用最佳CNR所得到的keV單能量圖像上,測量各節(jié)段的對比度和噪聲值,并請另外2位副主任及以上長期從事血管影像工作的放射科醫(yī)師,分別對利用最佳CNR所獲得的單能量圖像、QC圖像以及系統(tǒng)默認選擇的單能量圖像的圖像質(zhì)量進行評分,以評估利用最佳CNR進行后處理的價值。采用Stata10.0軟件進行統(tǒng)計學處理,P0.05表明差異具有統(tǒng)計學意義。 結(jié)果：利用最佳CNR得到的keV平均值為(51.5±7.3)keV。96例患者下肢動脈共計864段,利用最佳CNR得到的單能量的圖像得分均明顯高于系統(tǒng)默認keV單能量圖像和QC圖像,系統(tǒng)默認keV圖像的圖像得分高于QC圖像,結(jié)果具有統(tǒng)計學意義(P0.05)。與其他2種方法比較,利用最佳CNR所得到的各節(jié)段keV單能量圖像的對比度及噪聲也均高于其他2種方法。 結(jié)論：利用最佳CNR技術(shù)選取一個最佳的keV單能量圖像,可使下肢動脈和其周圍組織獲得最佳的對比度,使下肢動脈顯示得更加清晰,從而使下肢動脈CTA的圖像質(zhì)量大大增強。 二、肝臟動脈CTA圖像后處理中最佳單能量的選擇 目的：探討利用最佳CNR后處理技術(shù)選擇一個最理想的keV單能量圖像對提高肝臟動脈CTA圖像質(zhì)量的應(yīng)用價值。 方法：收集我院2011年10月至2012年10月,臨床擬診為肝臟惡性腫瘤的患者96例,其中男性62例,女性34例。采用GE Discovaery750概念500排寶石HDCT,掃描范圍從右側(cè)膈頂至雙腎,所有病例均經(jīng)DSA確診。圖像后處理采用儀器自備ADW4.4以及GSI-view軟件進行重建,在單能量橫斷面圖像上測量最佳CNR并從101個單能量序列中挑出滿足最佳CNR的單能量序列。分別在QC圖像、系統(tǒng)默認keV以及利用最佳CNR所得到的keV單能量圖像上,測量肝固有動脈和肝右動脈的對比度和噪聲值,并請另外2位副主任及以上長期從事腹部及血管影像工作的放射科醫(yī)師,分別對利用最佳CNR所獲得的單能量圖像、QC圖像以及系統(tǒng)默認選擇的單能量圖像的橫斷面圖像以及MPR和VR圖像的質(zhì)量進行評分,以評估利用最佳CNR進行后處理的價值。采用Stata10.0軟件進行統(tǒng)計學處理。P0.05表明差異具有統(tǒng)計學意義。 結(jié)果：利用最佳CNR所得到的keV單能量圖像的得分明顯高于其他2種方法所得到的圖像,系統(tǒng)默認keV圖像的得分高于QC圖像的得分,結(jié)果具有統(tǒng)計學意義(P0.05)。與其他2種方法比較,利用最佳CNR所得到的keV單能量圖像中,肝動脈的對比度均高于其他2種方法。利用最佳CNR所得到的KeV單能量圖像的噪聲也比其他2種方法高(P0.05)。 結(jié)論：利用最佳CNR技術(shù)選取一個最佳的keV單能量圖像,使肝動脈和其周圍組織獲得最佳的對比度,使肝臟動脈顯示得更加清晰,從而使肝臟動脈CTA的圖像質(zhì)量大大增強。
[Abstract]:The choice of optimal single-energy image in post-treatment of low-limb arterial disease Objective: To study the application price of the optimal contrast-to-noise ratio for improving the image quality of the lower limb artery CTA image. Methods:96 patients with lower extremity arterial disease from May 2010 to July 2012 were collected, including 44 male,52 female,13 in grade 1,12 in grade 2,29 in grade 3,26 in grade 4 and 5 in grade 5. 16 cases. The scan range from the umbilicus to the sole of the foot was measured with the GE Discover 750 gem energy spectrum CT, all of which were DS A. The image post-treatment is reconstructed with the instrument-provided ADW3.4 and the GSI-view software, and the best measurement is performed on the single-energy cross-section image CNR. The contrast and noise values of each segment are measured on the QC image, the system default keV, and the keV single-energy image obtained with the optimal CNR, respectively, according to the segmentation method of the lower limb artery, such as Ota, and the other two deputy directors and the above-mentioned long-term radiation of the blood vessel image are requested. The cardiologist scores the image quality of the single-energy image, the QC image, and the system default selected single-energy image obtained with the best CNR, respectively, to evaluate the post-processing with the best CNR The value of the software was statistically treated with the Stata10.0 software, and the difference between the two groups was statistically significant (P <0.05). The results showed that the mean value of keV obtained by the optimal CNR was (51.5-7.3) keV. In the total of 864 cases, the image scores of single-energy obtained by the optimal CNR were significantly higher than the system's default keV single-energy image and the QC image, and the image score of the system's default keV image was high. For QC images, the results were statistically significant (P 0.05) Compared with the other two methods, the contrast and noise of the single-energy image of each segment of the energy obtained by using the optimal CNR are also higher than the contrast and the noise of the single-energy image of each segment obtained by the optimal CNR. Conclusion: The best contrast of the lower limb artery and the surrounding tissues can be obtained by using the optimal CNR technique, so that the lower limb arteries can be displayed more clearly, so that the lower limb artery CTA can be obtained. The image quality is greatly enhanced. The posterior position of the CTA image of the hepatic artery Objective: To study the choice of optimal single energy in the treatment of hepatic artery C by using the optimal CNR post-treatment technique to select one of the most desirable single-energy images of keV. Application value of TA image quality. Methods:96 patients with malignant tumor of the liver were collected from October,2011 to October,2012. Of these,62 were male,34 were female, and 500 rows of gemstones HDCT were used with the concept of GE Discover 750. The scan range was from the right phrenic top to the double. The kidney and all the cases were diagnosed by DSA. The image post-treatment was reconstructed using the instrument-supplied ADW3.4 and the GSI-view software, and the optimal CNR was measured on the single-energy cross-sectional image and picked out from 101 single-energy sequences. The single-energy sequence of the optimal CNR is met. The contrast and noise values of the hepatic and right arteries are measured on the QC image, the system default keV, and the keV single-energy image obtained with the optimal CNR, and the other two deputy directors and the above-mentioned long-term abdomen are requested. and scoring the cross-sectional images of the single-energy image, the QC image and the system default-selected single-energy image and the quality of the MPR and the VR images by using the single-energy image, the QC image and the system default selected by the optimal CNR, so as to evaluate and utilize the single-energy image, the QC image and the system default-selected single-energy image, The value of post-treatment with the best CNR. Stata is used 10.0 Statistical processing of the software. P0. Results: The results showed that the score of keV single-energy image obtained by the best CNR was significantly higher than that of the other two methods, and the score of the system's default keV image was higher than that of the QC image, and the result was that the score of the system's default keV image was higher than that of the QC image. The results were statistically significant (P0.05). In comparison with the other two methods, the liver of the one-energy image obtained by the best CNR The contrast of the artery is higher than the other two methods. The noise of the KeV single-energy image obtained with the best CNR also Conclusion: The best contrast between the hepatic artery and its surrounding tissues is obtained by using the optimal CNR technique to make the best contrast between the hepatic artery and its surrounding tissues, so that the hepatic artery can be displayed more clearly.
【學位授予單位】：復旦大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：R543.5;R816.2

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