A phantom-based calibration method for digital x-ray tomosynthesis.
A phantom-based calibration method for digital x-ray tomosynthesis.
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DOI：
10.3233/xst-2012-0316
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发表时间：
2012
影响因子：
3
通讯作者：
Liu H
中科院分区：
文献类型：
--
作者：
Miao H;Wu X;Zhao H;Liu H
本研究的目的是开发一种基于体模的实验校准方法，以最大限度地减少数字断层合成原型的几何错位的重建伪影。设计了具有十个基准标记的校准体模。使用该校准体模，在一系列未对准条件下从每个投影视图获取实验数字断层合成原型的投影矩阵。对美国放射学会乳房X线摄影体模进行成像和重建，使用和不使用相应的校准投影矩阵的校正。通过对比标定前后的图像，定量分析了标定技术的有效性。随着等中心水平位移的增加，重建伪影变得清晰可辨。使用校准技术，重建伪影所造成的等中心水平移位有效地减少了原型。对于本研究中使用的特定实验条件，基于体模的校准方法有效地减少了本研究中研究的原型的重建伪影。该校准方法具有使其他断层合成应用受益的潜力。
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. 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. 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. 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.