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首页> 外文会议>Physics of Medical Imaging pt.1; Progress in Biomedical Optics and Imaging; vol.8 no.29; Proceedings of SPIE-The International Society for Optical Engineering; vol.6510 pt.1 >Effect of Acquisition Parameters on Image Quality in Digital Tomosynthesis
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Effect of Acquisition Parameters on Image Quality in Digital Tomosynthesis

机译：数字断层合成中采集参数对图像质量的影响

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Digital tomosynthesis (DTS) is emerging as an advanced imaging technique that enables volumetric slice imaging with a detector typically used for projection radiography. An understanding of the interactions between DTS acquisition parameters and characteristics of the reconstructed slice images is required for optimizing the acquisition protocols of various clinical applications. This paper presents our investigation of the effects and interactions of acquisition parameters, including sweep angle, number of projections, and dose, on clinically relevant image-quality metrics. Metrics included the image characteristics of in-slice resolution, depth resolution, image noise level, and presence of ripple. Phantom experiments were performed to characterize the relationship between the acquisition parameters and image quality. Results showed that the depth resolution was mainly dependent on sweep angle. Visibility of ripple was determined by the projection density (number of projections divided by sweep angle); as well as properties of the imaged object. Image noise was primarily dependent on total dose and not significantly affected by the number of projections. These experimental and theoretical results were confirmed using anthropomorphic phantoms and also used to develop clinical acquisition protocols. Assessment of phantom and clinical images obtained with these protocols revealed that the use of acquisition protocols optimized for a given clinical exam enables rapid, low-dose, high quality DTS imaging for diverse clinical applications including abdomen, hand, shoulder, spine, and chest. We conclude that DTS acquisition parameters have a significant effect on image quality and should be tailored for the imaged anatomy and desired clinical application. Relationships developed in this work will guide the selection of acquisition protocols to improve image quality and clinical utility of DTS for a wide variety of clinical exams.
机译：数字断层合成（DTS）作为一种先进的成像技术正在兴起，该技术可以使用通常用于投影射线照相的检测器进行体积切片成像。为了优化各种临床应用的采集协议，需要了解DTS采集参数与重建切片图像的特征之间的相互作用。本文介绍了我们对获取参数（包括扫描角，投影数量和剂量）对临床相关图像质量指标的影响和相互作用的调查。指标包括切片分辨率，深度分辨率，图像噪声水平和波纹的图像特征。进行了幻影实验以表征采集参数和图像质量之间的关系。结果表明，深度分辨率主要取决于扫掠角。波纹的可见性由投影密度（投影数除以扫掠角）确定；以及成像对象的属性。图像噪声主要取决于总剂量，并且不受投影数量的明显影响。这些实验和理论结果已使用拟人化体模得到证实，并已用于开发临床采集方案。对通过这些协议获得的幻像和临床图像的评估表明，针对给定临床检查优化的采集协议的使用可为腹部，手，肩，脊柱和胸部等多种临床应用提供快速，低剂量，高质量的DTS成像。我们得出的结论是，DTS采集参数对图像质量有重大影响，应针对成像的解剖结构和所需的临床应用进行调整。在这项工作中发展的关系将指导选择采集协议，以提高DTS的图像质量和临床实用性，以用于各种临床检查。

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