Quality and accuracy of cone beam computed tomography gated by active breathing control.
Quality and accuracy of cone beam computed tomography gated by active breathing control.
复制标题
由主动呼吸控制控制的锥形束计算机断层扫描的质量和准确性。
DOI：
10.1118/1.3013568
复制
发表时间：
2008
期刊：
影响因子：
3.8
通讯作者：
Hugo,GeoffreyD
中科院分区：
文献类型：
--
作者：
Thompson,BriaP;Hugo,GeoffreyD
本研究的目的是评估主动呼吸控制 (ABC) 门控的锥形束计算机断层扫描 (CBCT) 的质量和准确性，这可能有助于在存在呼吸时进行图像引导。对传统 ABC-CBCT（走走停停）、快速 ABC-CBCT（一种通过减慢机架速度而不是在自由呼吸期间停止来加速采集的方法）和自由呼吸呼吸相关 CBCT 进行了比较。图像质量在体模中进行评估。评估了重建体素强度、均匀性和均方根误差的准确性。使用拟人模型和质量保证模型对配准精度（骨和软组织）进行量化。相对于龙门速度调制来测量龙门角度精度。传统的 ABC-CBCT 扫描时间范围为 .快速 ABC-CBCT 扫描时间范围为 ，呼吸相关 CBCT 扫描需要完成。 ABC 门控扫描的体素强度值相对于具有所有投影的正常临床扫描来说是准确的。随着快速 ABC-CBCT 扫描重建中使用的投影数量减少（最短屏气、最长自由呼吸段），均匀性和均方根误差性能下降。小校正、大校正和旋转校正的配准精度在 1° 以内。所有扫描的龙门角度精度均在 1° 以内。对于高对比度目标，快速和传统 ABC-CBCT 扫描以及呼吸相关 CBCT 的图像引导性能相似。
The purpose of this study was to evaluate the quality and accuracy of cone beam computed tomography (CBCT) gated by active breathing control (ABC), which may be useful for image guidance in the presence of respiration. Comparisons were made between conventional ABC‐CBCT (stop and go), fast ABC‐CBCT (a method to speed up the acquisition by slowing the gantry instead of stopping during free breathing), and free breathing respiration correlated CBCT. Image quality was assessed in phantom. Accuracy of reconstructed voxel intensity, uniformity, and root mean square error were evaluated. Registration accuracy (bony and soft tissue) was quantified with both an anthropomorphic and a quality assurance phantom. Gantry angle accuracy was measured with respect to gantry speed modulation. Conventional ABC‐CBCT scan time ranged from . Fast ABC‐CBCT scan time ranged from , and respiratory correlated CBCT scans took to complete. Voxel intensity value for ABC gated scans was accurate relative to a normal clinical scan with all projections. Uniformity and root mean square error performance degraded as the number of projections used in the reconstruction of the fast ABC‐CBCT scans decreased (shortest breath hold, longest free breathing segment). Registration accuracy for small, large, and rotational corrections was within and 1°. Gantry angle accuracy was within 1° for all scans. For high‐contrast targets, performance for image‐guidance purposes was similar for fast and conventional ABC‐CBCT scans and respiration correlated CBCT.