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Parallel-Shift Tomosynthesis for Orthopedic Applications

机译：骨科应用的平行移位层析合成

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The upsurge in interest of digital tomosynthesis is mainly caused by breast imaging; however, it finds more and more attention in orthopedic imaging as well. Offering a superior in-plane resolution compared to CT imaging and the additional depth information compared to conventional 2-D X-ray images, tomosynthesis may be an interesting complement to the other two imaging modalities. Additionally, a tomosynthesis scan is likely to be faster and the radiation dose is considerably below that of a CT. Usually, a tomosynthetic acquisition focuses only on one body part as the common acquisition techniques restrict the field-of-view. We propose a method which is able to perform full-body acquisitions with a standard X-ray system by shifting source and detector simultaneously in parallel planes without the need to calibrate the system beforehand. Furthermore, a novel aliasing filter is introduced which addresses the impact of the non-isotropic resolution during the reconstruction. We provide images obtained by filtered as well as unh'ltered backprojection and discuss the influence of the scanning angle as well as the reconstruction filter on the reconstructed images. We found from the experiments that our method shows promising results especially for the imaging of anatomical structures which arc usually obscured by each other since the depth resolution allows to distinguish between these structures. Additionally, as of the high isotropic in-plane spatial resolution of the tomographic volume, it is easily possible to perform precise measurements which are a crucial task, e.g. during the planning of orthopedic surgeries or the assessment of pathologies like scoliosis or subtle fractures.
机译：对数字断层合成的兴趣激增主要是由乳腺成像引起的。但是，它在骨科成像中也越来越受到关注。断层合成可能比CT成像具有更好的面内分辨率，并且比常规的2-D X射线图像具有更多的深度信息，这可能是对其他两种成像方式的有趣补充。另外，断层合成扫描可能会更快，并且辐射剂量大大低于CT的剂量。通常，断层合成采集仅集中在一个身体部位，因为常见的采集技术限制了视野。我们提出了一种方法，该方法能够通过在平行平面中同时移动源和检测器而使用标准X射线系统执行全身采集，而无需事先校准系统。此外，引入了新颖的混叠滤波器，其解决了重建期间非各向同性分辨率的影响。我们提供了通过滤波以及无反投影获得的图像，并讨论了扫描角度以及重构滤波器对重构图像的影响。从实验中我们发现，我们的方法显示出令人鼓舞的结果，特别是对于通常相互遮挡的解剖结构的成像，因为深度分辨率可以区分这些结构。另外，由于层析成像体积的高各向同性的面内空间分辨率，很容易执行精确的测量，这是至关重要的任务，例如，在整形外科手术计划或脊柱侧弯或细微骨折等病理评估过程中。

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