Bladder neoplasms Radiation dosage Tomography, spiral comput
本文關(guān)鍵詞:ASIR技術(shù)在膀胱腫瘤模型低劑量CT掃描中的應(yīng)用研究,由筆耕文化傳播整理發(fā)布。
ASIR技術(shù)在膀胱腫瘤模型低劑量CT掃描中的應(yīng)用研究
An appfication study of ASIR technique in bladder tumor model with low-dose CT scanning
[1] [2] [3] [4] [5] [6] [7] [8] [9] [10]
ZHAO Ya-bo, WANG Bo, WU Xing-jie, MA Li-heng, ZENG Wen-yan, ZHUANG Niang-tuo, YANG Qing-hua, LIU Wei-jun, WANG Yong-hao, DU Sen (1. Medical Imaging Department, the First
[1]廣東藥學(xué)院附屬第一醫(yī)院影像科,廣東廣州510080; [2]佳林醫(yī)學(xué)院人體解剖學(xué)教研室,廣西桂林541000
文章摘要:目的:通過對膀胱腫瘤模型行多排螺旋CT不同劑量下掃描,對獲得圖像行自適應(yīng)統(tǒng)計迭代重建(Adaptive statistical iterative reconstruction。ASIR)及CT仿真膀胱鏡成像(CTVC),比較各種不同劑量條件下所得圖像的質(zhì)量,分析ASIR技術(shù)在膀胱腫瘤低劑量CT檢查中的應(yīng)用價值。方法:選用一新鮮正常豬膀胱,在其黏膜表面通過結(jié)扎法獲得20枚1-10mm(≤5mm13枚,〉5mm7枚)連續(xù)的模擬腫瘤,運用高分辨CT(GE optima CT660)在不同劑量(120kVp,20、40、60、80、100、120、140、160、180、200mA)下掃描,并分別應(yīng)用11種不同ASIR水平(0、10%、20%、30%、40%、50%、60%、70%、80%、90%及100%)進行數(shù)據(jù)重建,獲得CTVC圖像,對不同采集條件、不同ASIR水平的圖像進行客觀和主觀評價,測量并比較平均噪聲、平均信噪比(SNR)、平均對比噪聲比(CNR)及CTVC圖像的腫瘤檢出率。結(jié)果:在管電流一定情況下,各組圖像經(jīng)80%水平ASIR重建后,其噪聲呈較明顯下降(P〈0.05)。在相同管電流下,隨著ASIR水平的增高,圖像的SNR值逐漸升高(P〈0.05)。在相同管電流下,隨著ASIR水平的增高,圖像的CNR值逐漸升高(P〈0.05)。CTVC圖像對膀胱腫瘤的檢出率在管電流一定的情況下,各病灶的檢出率隨ASIR水平的升高并無明顯提高(P〉0.05)。結(jié)論:ASIR技術(shù)可以提高膀胱低劑量CT圖像的質(zhì)量,,降低患者所接受的輻射劑量,但是,ASIR技術(shù)提高膀胱CTVC圖像病灶檢出率的能力有限,需要更多的實驗進行深入研究。
Abstr:Objective: To compare the quality and lesion conspicuity of images of bladder tumor model acquired on CT by standard-dose and low-dose with adaptive statistical iterative reconstruction(ASIR) and CT virtual eystoscopy(CTVC) imag- ing, and to evaluate the application of ASIR technique for low dose CT scanning of bladder tumors. Methods: A fresh porcine bladder was adopted and ligated 20 lumps (1-10 nam, ≤5 mm 13 lumps, 〉5 mm 7 lumps) to simulate bladder tumors. High resolution CT(GE optima CT660) with different doses(120 kVp, 20, 40, 60, 80, 100, 120, 140, 160, 180, 200 mA) scan- ning was used, and 11 different levels of ASIR (0, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% and 100%) for data reconstruction were performed to get CTVC images. After objective and subjective evaluation of images collected in different conditions of different ASIR levels, the average noise, signal-to-noise ratio(SNR), contrast to noise ratio(CNR) and tumor detec- tion rate were compared and analyzed. Results: Under the same tube current, the noise of images decreased obviously with ASIR level of 80%(P〈0.05). Under the same tube current, image SNR increased gradually with the increase of ASIR levels(P〈 0.05). Under the same tube current, image CNR increased gradually with the increase of ASIR levels (P〈0.05). Under a con- stant tube current, the lesion detection rate did not increase obviously with the increase of ASIR levels (P〉0.05). Conclusion: ASIR technique can improve the quality of low-dose CT images of the bladder with reduction of radiation dose. ASIR tech- nique cannot obviously improve the lesion detection rate of the bladder CTVC images.
文章關(guān)鍵詞:
Keyword::Bladder neoplasms Radiation dosage Tomography, spiral computed
本文關(guān)鍵詞:ASIR技術(shù)在膀胱腫瘤模型低劑量CT掃描中的應(yīng)用研究,由筆耕文化傳播整理發(fā)布。
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