This paper reports feasibility evaluations of a distance measuring navigation for fetoscopic laser photocoagulation (FLP) of placental anastmotic communicating vessels between twin fetuses to treat twin-to-twin transfusion syndrome (TTTS) in intrauterine fetal surgery. This navigation uses only a laser fiber for photocoagulation and a fiberscope for a fetoscope, which are usually used in conventional FLP, and a computer to analyzing the fetoscopic view including a laser fiber tip and a guide-spot of red diode-laser. From fiberscopic view, pixels between center of the fetoscopic circular view and center of the guide-spot irradiated from a laser fiber are automatically detected. These pixels can be converted to the real distance between fetoscope tip and target according to geometric and optical relation of a laser fiber and a fetoscope including warping correction. In distance measuring evaluation, measuring errors between the fiberscope tip and target plates were under ±1 mm around 10-mm distance from the target regardless of target angles (0-40 degrees) and colors. In conclusion, accuracy of our distance measuring navigation can provide more secure FLP in clinical use with minimum instruments.
CITATION STYLE
Yamashita, H., Yamashita, T., Masamune, K., Liao, H., Kim, K., Chiba, T., & Dohi, T. (2009). Distance measuring navigation for fetoscopic laser photocoagulation to treat twin-to-twin transfusion syndrome: Feasibility evaluations. In IFMBE Proceedings (Vol. 25, pp. 197–200). Springer Verlag. https://doi.org/10.1007/978-3-642-03906-5_54
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