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A phantom-based calibration method for digital X-ray tomosynthesis

机译:基于幻影的数字X射线断层扫描定标方法

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The purpose of this study was to develop a phantom-based experimental calibration method to minimize the reconstruction artifacts for the geometric misalignments of the digital tomosynthesis prototype. Methods: A calibration phantom with ten fiducial markers was designed. Using this calibration phantom, the projection matrices of an experimental digital tomosynthesis prototype were acquired from each projection view under a series of misalignment conditions. The American College of Radiology mammography phantom was imaged and reconstructed with and without using the correction of the corresponding calibration projection matrices. The effectiveness of the calibration technique was then quantitatively analyzed through comparison of the calibrated and uncalibrated images. Results: As the isocenter horizontal-shift increases, the reconstruction artifacts become clearly distinguishable. Using the calibration technique, the reconstruction artifacts resulting from the isocenter horizontal-shift were effectively minimized for the prototype. Conclusions: For the specific experimental conditions utilized in this study, the phantom-based calibration method effectively reduced reconstruction artifacts for the prototype investigated in this study. The calibration method holds potential to benefit other tomosynthesis applications.
机译:这项研究的目的是开发一种基于幻影的实验校准方法,以最大程度地减少数字断层合成原型的几何失准的重建伪影。方法:设计了带有十个基准标记的校准体模。使用该校准体模,在一系列错位条件下,从每个投影视图中获取了实验数字断层合成原型的投影矩阵。在使用和不使用相应校准投影矩阵的校正的情况下,对美国放射学院的乳房X线照相模型进行了成像和重建。然后,通过比较已校准和未校准的图像来定量分析校准技术的有效性。结果:随着等角点水平移动的增加,重建伪影变得清晰可辨。使用校准技术,有效地最小化了由等中心线水平移动产生的重建伪影。结论:对于本研究中使用的特定实验条件,基于幻像的校准方法有效地减少了本研究中所研究原型的重建伪影。校准方法具有使其他断层合成应用受益的潜力。

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