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首页> 外文会议>Optical diagnostics and sensing XVIII: Toward Point-of-Care Diagnostics >Challenges in automated estimation of capillary refill time in dogs
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Challenges in automated estimation of capillary refill time in dogs

机译：自动估算犬毛细血管充盈时间的挑战

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摘要

Capillary refill time (CRT) is a part of the cardiorespiratory examination in dogs. Changes in CRT can reflect pathological conditions like shock or anemia. Visual CRT estimation has low repeatability; therefore, optical systems for automated estimation have recently appeared. Since existing systems are unsuitable for use in dogs, we designed a simple, small and portable device, which could be easily used at veterinary clinic. The device was preliminarily tested on several measurement sites in two dogs. Not all measurement sites were suitable for CRT measurements due to underlying tissue optical and mechanical properties. The CRT measurements were possible on the labial mucosa, above the sternum and on the digit where CRT was in the range of values, retrieved from the color video of the visual CRT measurement. It seems that light penetration predominantly governs tissue optical response when the pressure is applied. Therefore, it is important to select a proper light, which reaches only superficial capillaries and does not penetrate deeper. Blue or green light is probably suitable for light skin or mucosa. on the other hand, red or near-infrared might be used for skin with pigmented or thick epidermis. Additionally, further improvements of the device design are considered, like adding a calibrated spring, which would insure application of consistent pressure.
机译：毛细血管补充时间（CRT）是犬心肺检查的一部分。 CRT的变化可反映出诸如休克或贫血等病理状况。可视CRT估计的可重复性低；因此，最近出现了用于自动估计的光学系统。由于现有系统不适合在狗中使用，因此我们设计了一种简单，小型且便于携带的设备，可以在兽医诊所轻松使用。该设备已在两只狗的几个测量位置进行了初步测试。由于潜在的组织光学和机械性能，并非所有的测量部位都适合CRT测量。 CRT测量可以在阴唇，胸骨上方以及在CRT值范围内的手指上进行，这些CRT是从可视CRT测量的彩色视频中检索到的。似乎在施加压力时，光穿透主要控制组织的光学反应。因此，重要的是要选择适当的光线，该光线只能到达浅表毛细血管，并且不能穿透更深。蓝光或绿光可能适合浅色皮肤或粘膜。另一方面，红色或近红外可用于表皮色素沉着或厚实的皮肤。此外，还考虑了设备设计的进一步改进，例如增加了校准弹簧，以确保施加一致的压力。

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