Evaluation of tilted cone-beam CT orbits in the development of a dedicated hybrid mammotomograph.
Evaluation of tilted cone-beam CT orbits in the development of a dedicated hybrid mammotomograph.
复制标题
在专用混合乳房仪的开发中评估倾斜的锥束CT轨道。
DOI：
10.1088/0031-9155/54/12/004
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发表时间：
2009-06-21
影响因子：
3.5
通讯作者：
Tornai, M. P.
中科院分区：
文献类型：
--
作者：
Madhav, P.;Crotty, D. J.;McKinley, R. L.;Tornai, M. P.
一种紧凑的专用3D乳房SPECT-CT（乳房断层扫描）系统目前正在开发中。在其最初的原型中，锥束CT子系统仅限于围绕患者垂坠乳房进行固定倾斜的圆周旋转。本研究评估了CT子系统的稳定倾斜角度，这将使乳房和胸壁的最大体积采样和观察成为可能。使用各种固定倾斜的圆形和三维正弦轨迹获得几何/拟人模型图像。与复杂轨道相比，倾斜锥束轨道的迭代重建图像显示出更大的畸变和衰减系数误差。此外，在倾斜锥形光束的中心平面远端的平面上，线条轮廓说明了拔罐伪影，否则对于具有复杂轨迹的图像来说就不明显了。这表明采样不足的锥束数据可能是拔罐伪影的另一个原因。高频目标可以在所有轨迹上被区分出来，但是它们的形状和位置被面外频率信息所破坏。虽然更多的丙烯酸球在乳房后部具有固定的倾斜和接近平坦的锥形梁，但3D复杂轨迹在整个重建体积中具有更少的畸变和更完整的采样。而复杂的轨迹是理想的首选，负固定倾斜的源探测器配置显示最小的扭曲的病人图像。
A compact dedicated 3D breast SPECT-CT (mammotomography) system is currently under development. In its initial prototype, the cone-beam CT sub-system is restricted to a fixed-tilt circular rotation around the patient’s pendant breast. This study evaluated stationary-tilt angles for the CT subsystem that will enable maximal volumetric sampling and viewing of the breast and chest wall. Images of geometric/anthropomorphic phantoms were acquired using various fixed-tilt circular and 3D sinusoidal trajectories. The iteratively reconstructed images showed more distortion and attenuation coefficient inaccuracy from tilted cone-beam orbits than from the complex trajectory. Additionally, line profiles illustrated cupping artifacts in planes distal to the central plane of the tilted cone-beam, otherwise not apparent for images acquired with complex trajectories. This indicates that undersampled cone-beam data may be an additional cause of cupping artifacts. High-frequency objects could be distinguished for all trajectories, but their shapes and locations were corrupted by out-of-plane frequency information. Although more acrylic balls were visualized with a fixed-tilt and nearly flat cone-beam at the posterior of the breast, 3D complex trajectories have less distortion and more complete sampling throughout the reconstruction volume. While complex trajectories would ideally be preferred, negatively fixed-tilt source–detector configuration demonstrates minimally distorted patient images.
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影响因子：
3.5
作者：
Brzymialkiewicz, C. N.;Tornai, M. P.;Bowsher, J. E.
通讯作者：
Bowsher, J. E.
影响因子：
3.8
作者：
Chen, B;Ning, R
通讯作者：
Ning, R
影响因子：
1.8
作者：
McKinley, RL;Tornai, MP;Bradshaw, ML
通讯作者：
Bradshaw, ML
影响因子：
10.6
作者：
SMITH, BD
通讯作者：
SMITH, BD
影响因子：
2.5
作者：
Boone, John M.;Kwan, Alex L. C.;Nelson, Thomas R.
通讯作者：
Nelson, Thomas R.