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    • 3. 发明授权
    • Dynamic dose control for computed tomography
    • 计算机断层扫描的动态剂量控制
    • US07558364B2
    • 2009-07-07
    • US10599418
    • 2005-03-30
    • Zhongmin Steve Lin
    • Zhongmin Steve Lin
    • A61B6/00
    • A61B6/542A61B6/032
    • In a dose modulation method, transmission tomographic imaging data of an associated imaging subject are acquired using a radiation source (14) revolving around the associated imaging subject. During the tomographic imaging, an estimated attenuation of radiation is determined for an upcoming position or angular bin (721, 82) of the revolving radiation source based on attenuations determined at previously acquired positions or angular bins (701, 84, 90) of the radiation source. Prior to acquiring tomographic imaging data at the upcoming position or angular bin, a level of radiation produced by the radiation source is adjusted based on the estimated attenuation of radiation.
    • 在剂量调制方法中,使用围绕相关联的成像对象旋转的辐射源(14)获取相关联的成像对象的透射层析成像数据。 在断层成像期间,基于在先前获取的位置或辐射的角位置(701,84,90)处确定的衰减来确定旋转辐射源的即将到来的位置或角度仓(721,82)的辐射的估计衰减 资源。 在即将到来的位置或角仓之前获取断层摄影成像数据之前,基于估计的辐射衰减来调整由辐射源产生的辐射水平。
    • 6. 发明授权
    • Method and apparatus for digital image defect correction and noise filtering
    • 用于数字图像缺陷校正和噪声滤波的方法和装置
    • US06747697B1
    • 2004-06-08
    • US09614336
    • 2000-07-12
    • Zhongmin Steve LinDavid NicolayHung Yuet Wong
    • Zhongmin Steve LinDavid NicolayHung Yuet Wong
    • H04N964
    • G06T5/20G06T5/005G06T2207/10121G06T2207/20012G06T2207/20032
    • An adaptive median filter (40) provides dynamic detection and correction of digital image defects which are caused by defective or malfunctioning elements of a radiation detector array (20). The adaptive median filter receives (100) lines of pixel values of a digital image that may have defects and a user-defined defect threshold. The lines of pixel values are scanned on a pixel-by-pixel basis using a kernel of n×n pixels, where the kernel contains the candidate pixel being examined (120). Each kernel is numerically reordered (130) and a median value is calculated (140). A defect threshold value is calculated by multiplying the user-defined defect threshold criteria and the candidate pixel value (150). A reference value is calculated by subtracting the candidate pixel value and the median value (160). The reference value is compared to the defect threshold value (170). The candidate pixel value is replaced by the median value (180) if it differs from the median value by more than the predefined defect threshold, e.g., 20%. The adaptive median filter is particularly effective in detecting and correcting double line and double column defects in digital images. In addition, the filter minimizes image blurring and maintains image resolution by filtering only defective pixels.
    • 自适应中值滤波器(40)提供由辐射探测器阵列(20)的元件的缺陷或故障引起的数字图像缺陷的动态检测和校正。 自适应中值滤波器接收可能具有缺陷的数字图像的像素值(100)和用户定义的缺陷阈值。 使用nxn像素的内核逐像素地扫描像素值的行,其中内核包含正在检查的候选像素(120)。 每个内核在数值上重新排序(130),并计算一个中值(140)。 通过将用户定义的缺陷阈值标准和候选像素值(150)相乘来计算缺陷阈值。 通过减去候选像素值和中值(160)来计算参考值。 参考值与缺陷阈值(170)进行比较。 如果候选像素值与中值相差超过预定义的缺陷阈值(例如20%),则由中值(180)代替。 自适应中值滤波器在检测和校正数字图像中的双线和双列缺陷方面特别有效。 此外,滤镜可最大限度地减少图像模糊,并仅通过滤除缺陷像素来保持图像分辨率。