北京生物醫(yī)學(xué)工程

一種基于壓縮傳感理論的CT劑量降低方法

A Compressed Sensing-Based CT Dose Reduction Method

作者：羅海王淑影潘文宇周荷琴

單位：中國科學(xué)技術(shù)大學(xué)自動化系(合肥230027)

關(guān)鍵詞：計算機(jī)斷層成像技術(shù)；劑量；壓縮傳感；非均勻采樣

分類號：

出版年·卷·期（頁碼）：2011·30·5（441-446）

摘要：

目的 X射線計算機(jī)斷層成像技術(shù)(computed tomography,CT)輻射劑量高于其它Ｘ射線檢測。因為劑量累積效應(yīng)會導(dǎo)致較高的致癌風(fēng)險，因此降低劑量成為當(dāng)前CT技術(shù)發(fā)展過程中亟待解決的問題。方法降低劑量的手段主要有降低管電流和增加探測器排數(shù)，但受相關(guān)因素制約，進(jìn)一步降低劑量面臨較大困難。本文提出一種基于X射線衰減水平的自適應(yīng)非均勻采樣方式，通過減少在高管電流區(qū)域的投影次數(shù)來降低劑量，并引入基于壓縮傳感的POCS-TVM算法從欠采樣數(shù)據(jù)中恢復(fù)CT圖像。結(jié)果實驗結(jié)果表明該方法能在保證圖像質(zhì)量的同時有效降低劑量。結(jié)論基于壓縮傳感理論的CT劑量降低方法可以在保證重建圖像滿足臨床診斷需求的前提下，有效降低輻射劑量，有利于受檢者。

ObjectiveBecause the dose of CT(computed tomography) is higher than other X-ray modalities and the accumulative effect of dose results in high carcinogenic risk,dose reduction is a big challenge in the development of CT technology.MethodsCurrently,methods including decrease of tube current and increase of detector rows have not been efficient enough for further dose reduction.In this paper,we proposed a non-uniform self-adapting sampling method based on the X-ray attenuation.By decreasing the projection views in regions which have high tube current,the dose can be reduced.And POCS-TVM algorithm based on compressed sensing is applied to reconstructing CT image with insufficient sampling data.ResultsThe results of experiments show that this approach can reduce the radioactive dose significantly while ensure the acceptable quality of image.ConclusionsThe CT Dose reduction method based on a compressed sensing can reduce the dose and guarantee the clinical diagnostic quality of the reconstructed CT image,which benefits the subjects.

參考文獻(xiàn)：

［1］Hsieh J. Computed Tomography,Principles,Design,Artifacts,and Recent Advances［M］.
Bellingham: SPIE,2003.
［2］Tack D,Gevenois PA. Radiation Dose from Adult and Pediatric Multidetector Computed
Tomography［M］. Germany: Springer,2006.
［3］Sodickson A,Baeyens PF,Andriole KP,et al. Recurrent CT,Cumulative Radiation
Exposure,and Associated Radiation-induced Cancer Risks from CT of Adults［J］. Medical
Physics, 2009,251(1):175-184.
［4］Thorsten MB. Computed Tomography：From Photon Statistics to Modern Cone-Beam CT［M］.
Germany: Springer,2007.
［5］Gies M,Kalender WA,Wolf H,et al. Dose reduction in CT by anatomically adapted tube
current modulation. I. Simulation studies［J］. Med Phys,1999,26(11):2235-2247.
［6］Sidky EY,Kao CM,Pan X. Accurate image reconstruction from few-views and limited-angle
data in divergent-beam CT［J］. J X-Ray Sci Tech， 2006,14:119-139.
［7］Tang Jie,Nett BE,Chen GH. Performance comparison between total variation (TV)-based
compressed sensing and statistical iterative reconstruction algorithms［J］. Phys Med Biol,
2009,54:5781-5804.
［8］Mannudeep KK,Michael MM,Thomas LT et.al. Techniques and Applications of Automatic Tube
Current Modulation for CT［J］. Radiology, 2004,233:649-657.
［9］Candès E,Romberg J, Tao T. Robust uncertainty principles: Exact signal reconstruct-
tion from highly incomplete frequency informa-tion［J］. IEEE Trans Inform Theory, 2006,52
(2): 489-509.
［10］Yu HY,Ye YB,Zhao SY,et al. Local ROI reconstruction via generalized FBP and BPF
algorithms along more flexible curves［J］. Int J Biomed Imag,2006,Article ID:14989.
［11］莊天戈. CT原理與算法［M］. 上海：上海交通大學(xué)出版社,1992.

服務(wù)與反饋：

【文章下載】【加入收藏】

提示：您還未登錄，請登錄！點此登錄

51黑料吃瓜在线观看,51黑料官网|51黑料捷克街头搭讪_51黑料入口最新视频