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Evaluation of A New Breast-shaped Compensation Filter for A Newly Built Breast Imaging System

机译:新型乳房成像系统的新型乳房形补偿滤波器的评估

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摘要

A new breast-shaped compensation filter has been designed and fabricated for breast imaging using our newly built breast imaging (CBCTBI) system, which is able to scan an uncompressed breast with pendant geometry. The shape of this compensation filter is designed based on an average-sized breast phantom. Unlike conventional bow-tie compensation filters, its cross-sectional profile varies along the chest wall-to-nipple direction for better compensation for the shape of a breast. Breast phantoms of three different sizes are used to evaluate the performance of this compensation filter. The reconstruction image quality was studied and compared to that obtained without the compensation filter in place. The uniformity of linear attenuation coefficient and the uniformity of noise distribution are significantly improved, and the contrast-to-noise ratios (CNR) of small lesions near the chest wall are increased as well. Multi-normal image method is used in the reconstruction process to correct compensation flood field and to reduce ring artifacts.
机译:使用我们新建的乳房成像(CBCTBI)系统,已经设计并制造了一种用于乳房成像的新型乳房形补偿滤镜,该系统能够扫描具有悬垂几何形状的未压缩乳房。该补偿滤镜的形状是根据平均大小的乳房模型设计的。与传统的领结补偿过滤器不同,其横截面轮廓沿胸壁至乳头方向变化,以更好地补偿乳房的形状。三种不同尺寸的乳房模型用于评估该补偿滤波器的性能。研究了重建图像质量,并将其与未安装补偿滤波器的图像质量进行比较。线性衰减系数的均匀性和噪声分布的均匀性得到了显着改善,并且胸壁附近的小病变的对比噪声比(CNR)也有所提高。在重建过程中使用多法线图像方法来校正补偿洪水场并减少环伪影。

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