CAJ | 학술논문

根据锥束 CT 系统噪声的特性和序列切片图像的特点,提出了一种基于非局部均值的锥束CT序列切片去噪方法,给出了滤波度的定义.利用少量切片图像建立起滤波参数h与滤波前图像背景区域标准差、方法噪声图像结构区域标准差的关系,并在滤波度一致性的条件下得到滤波参数h与滤波前图像背景区域标准差的关系,由此可计算出每幅切片图像的h,使整个序列切片图像的滤波度保持基本一致.实验结果验证了该方法的有效性和可行性.
근거추속 CT 계통조성적특성화서렬절편도상적특점,제출료일충기우비국부균치적추속CT서렬절편거조방법,급출료려파도적정의.이용소량절편도상건립기려파삼수h여려파전도상배경구역표준차、방법조성도상결구구역표준차적관계,병재려파도일치성적조건하득도려파삼수h여려파전도상배경구역표준차적관계,유차가계산출매폭절편도상적h,사정개서렬절편도상적려파도보지기본일치.실험결과험증료해방법적유효성화가행성.
A denoising method based on Non-local means for sequence of slice images in cone-beam CT is proposed, according to the properties of the noise and sequence of slice images of cone-beam CT system, moreover, the definition of filtering degree is proposed as well. The relation of filtering strength to standard deviation of the background zone before filtering and the structure zone of method noise images is established. Moreover, the relationship between filtering strength and the standard deviation of the background zone before filtering is established under the same filtering degree to compute the filtering strength of each slice image, which contributes to the consistency of filtering degree of all slice images. The efficiency and feasibility of this method is verified by the experiment.