Design and development of a mobile image overlay system for needle interventions.
Design and development of a mobile image overlay system for needle interventions.
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DOI：
10.1109/embc.2014.6945035
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Fichtinger G
中科院分区：
文献类型：
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作者：
Anand M;King F;Ungi T;Lasso A;Rudan J;Jayender J;Fritz J;Carrino JA;Jolesz FA;Fichtinger G
先前，提出了静态和可调节的图像叠加系统用于辅助针介入。该系统要么固定在扫描仪上，要么安装在一个大型铰接平衡臂上，这些系统的某些缺点限制了临床应用。为了最大限度地减少这些限制，我们提出了移动的图像覆盖系统的目标是减少系统重量，更小的尺寸，并提高跟踪精度。设计研究包括最佳工作空间的定义，选择显示设备，镜子，和激光源。讨论了激光平面对准、体模设计、图像重叠平面校准和系统精度验证方法。虚拟图像由平板设备生成，并通过使用分束镜投射到患者体内。与以前的系统相比，观察箱重量（1.0kg）减少了8.2倍，图像覆盖平面跟踪精度（0.21mm，STD = 0.05）提高了5倍。图像覆盖平面的自动自校准通过两个简单的步骤实现，并且可以远离患者检查床完成。物理体模与扫描图像体积配准的基准配准误差为1.35 mm（STD = 0.11）。减少的系统重量和增加的光学跟踪精度应使系统能够由医生手持并探索患者的图像体积以进行针介入。
Previously, a static and adjustable image overlay systems were proposed for aiding needle interventions. The system was either fixed to a scanner or mounted over a large articulated counterbalanced arm. Certain drawbacks associated with these systems limited the clinical translation. In order to minimize these limitations, we present the mobile image overlay system with the objective of reduced system weight, smaller dimension, and increased tracking accuracy. The design study includes optimal workspace definition, selection of display device, mirror, and laser source. The laser plane alignment, phantom design, image overlay plane calibration, and system accuracy validation methods are discussed. The virtual image is generated by a tablet device and projected into the patient by using a beamsplitter mirror. The viewbox weight (1.0kg) was reduced by 8.2 times and image overlay plane tracking precision (0.21mm, STD=0.05) was improved by 5 times compared to previous system. The automatic self-calibration of the image overlay plane was achieved in two simple steps and can be done away from patient table. The fiducial registration error of the physical phantom to scanned image volume registration was 1.35mm (STD=0.11). The reduced system weight and increased accuracy of optical tracking should enable the system to be hand held by the physician and explore the image volume over the patient for needle interventions.