Determination of System Geometrical Parameters and Consistency between Scans for Contrast-Enhanced Digital Breast Tomosynthesis
Determination of System Geometrical Parameters and Consistency between Scans for Contrast-Enhanced Digital Breast Tomosynthesis
复制标题
对比增强数字乳腺断层合成系统几何参数和扫描一致性的确定
DOI：
10.1007/978-3-642-31271-7_4
复制
发表时间：
2012
影响因子：
0.6
通讯作者：
Wei Zhao
中科院分区：
文献类型：
--
作者：
D. Scaduto;Wei Zhao
数字乳腺断层合成摄影（DBT）需要精确了解采集几何结构，以实现准确的图像重建。此外，在双能量对比增强断层合成中采用的图像减法技术要求在几乎相同的几何条件下执行扫描。根据双能量对比增强断层合成成像的要求，开发了一种几何校准算法，以研究连续数字乳腺断层合成成像扫描之间的系统几何结构和图像采集的几何一致性。对原型DBT装置的几何精度和一致性的研究表明，角度测量准确，但扫描之间的采集角度可能存在临床显著差异。此外，观察到轻微的机架摆动，这表明需要将机架摆动纳入图像重建或改进系统硬件。
Digital breast tomosynthesis (DBT) requires precise knowledge of acquisition geometry for accurate image reconstruction. Further, image subtraction techniques employed in dual-energy contrast-enhanced tomosynthesis require that scans be performed under nearly identical geometrical conditions. A geometrical calibration algorithm is developed to investigate system geometry and geometrical consistency of image acquisition between consecutive digital breast tomosynthesis scans, according to requirements for dual-energy contrast-enhanced tomosynthesis. Investigation of geometrical accuracy and consistency on a prototype DBT unit reveals accurate angular measurement, but potentially clinically significant differences in acquisition angles between scans. Further, a slight gantry wobble is observed, suggesting the need for incorporation of gantry wobble into image reconstruction, or improvements to system hardware.