Revealing pelvic structures in the presence of metal hip prothesis via non-circular CBCT orbits.
Revealing pelvic structures in the presence of metal hip prothesis via non-circular CBCT orbits.
复制标题
通过非圆形 CBCT 轨道显示金属髋关节假体存在下的骨盆结构。
DOI：
10.1117/12.2652980
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Stayman,JWebster
中科院分区：
文献类型：
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作者：
Reynolds,Tess;Ma,Yiqun;Wang,Tianyu;Mei,Kai;Noël,PeterB;Gang,GraceJ;Stayman,JWebster
随着锥形束CT （CBCT）扩展到新的介入程序，金属假物的繁重挑战仍然存在。金属植入物和手术工具在视场中的光子饥饿和光束硬化可能导致感兴趣的解剖部分或完全被成像伪影遮挡。利用现代机器人CBCT成像系统的灵活性，通过确保采集过程中的数据完整性来实现旨在减少金属伪影的非圆形轨道已成为现实。在这里，我们研究了在骨盆解剖成像时使用非圆形轨道来减少金属髋关节假体产生的金属伪影。作为第一个概念验证，我们在CBCT测试台上实现了正弦和双圆弧轨道，对物理骨盆幻影进行成像，并使用两个金属髋关节假体，其中包含3d打印的填充碘的径向线对目标。用CBCT试验台实现的标准圆轨道作为比较器。成像数据收集和处理、几何校正和图像重建使用内部开发的软件程序完成。采用标准圆形轨道成像，在骨盆骨中观察到图像伪影，在重建图像中，径向线对目标可能的45对线对中只有33对是部分可分辨的。相比之下，正弦波和双圆弧轨道成像减少了周围解剖结构中的伪影，并使所有45对线对在重建图像中可见地分辨出来。这些结果表明，在金属髋关节假体存在的情况下，非圆形轨道有助于揭示骨盆区域先前阻塞的结构。
As the expansion of Cone Beam CT (CBCT) to new interventional procedures continues, the burdensome challenge of metal artifacts remains. Photon starvation and beam hardening from metallic implants and surgical tools in the field of view can result in the anatomy of interest being partially or fully obscured by imaging artifacts. Leveraging the flexibility of modern robotic CBCT imaging systems, implementing non-circular orbits designed for reducing metal artifacts by ensuring data-completeness during acquisition has become a reality. Here, we investigate using non-circular orbits to reduce metal artifacts arising from metallic hip prostheses when imaging pelvic anatomy. As a first proof-of-concept, we implement a sinusoidal and a double-circle-arc orbit on a CBCT test bench, imaging a physical pelvis phantom, with two metal hip prostheses, housing a 3D-printed iodine-filled radial line-pair target. A standard circular orbit implemented with the CBCT test bench acted as comparator. Imaging data collection and processing, geometric calibration and image reconstruction was completed using in-house developed software programs. Imaging with the standard circular orbit, image artifacts were observed in the pelvic bones and only 33 out of the possible 45 line-pairs of the radial line-pair target were partially resolvable in the reconstructed images. Comparatively, imaging with both the sinusoid and double-circle-arc orbits reduced artifacts in the surrounding anatomy and enabled all 45 line-pairs to be visibly resolved in the reconstructed images. These results indicate the potential of non-circular orbits to assist in revealing previously obstructed structures in the pelvic region in the presence of metal hip prosthesis.