In intravascular optical coherence tomography (OCT), the optical rotary junction plays an important role in rotating and pulling back the catheter to generate cross-sectional coronary artery images. To meet the requirements of high-speed intravascular OCT in a clinical setting, the rotary junction should generate high torque and low vibration. In this Letter, we demonstrate an ultrahigh speed optical rotary junction incorporating a hollow shaft brushless DC servomotor to remove a pulley belt, or a gear to minimize vibration noise and transfer stable torque. To evaluate the performance of the rotary junction, the vibration noise and variation of rotation were measured as a function of motor speed. The results showed that the rotary junction rotated the catheter at 42,000 revolutions per minute, with an optical transmission loss of 1.2 dB. To assess the feasibility of the rotary junction for high-speed catheter-based OCT, OCT imaging of the cylindrical shape of a phantom made by two overlapped plastic straws was performed at a rate of 200 frames/s.

中文翻译：

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带有空心轴直流电机的光学旋转接头，用于基于导管的高速光学相干层析成像

在血管内光学相干断层扫描（OCT）中，光学旋转接头在旋转和拉回导管以产生冠状动脉横截面图像方面起着重要作用。为了在临床环境中满足高速血管内OCT的要求，旋转接头应产生高扭矩和低振动。在这封信中，我们演示了一个超高速光学旋转结，该结结合了空心轴无刷直流伺服电机，以去除皮带轮或齿轮，以最大程度地减少振动噪声并传递稳定的扭矩。为了评估旋转接头的性能，测量了振动噪声和旋转变化作为电机转速的函数。结果表明，旋转接头使导管以每分钟42,000转的速度旋转，光传输损耗为1.2 dB。