Abstract: Objective To explore the application and techniques of dynamic infrared thermography device for perioperative monitoring of skin flap transplantation.Methods Thermal images were obtained by FLIR ONE pro camera,a portable thermal imager which can take infrared thermographs and optical photographs at the same time.The flaps and surrounding areas were photographed pre-operation,intra-operation and post-operation.Then the thermal images were analyzed by software FLIR Tools and the temperature of several spots or regions on the flaps were measured.At the same time,color Doppler ultrasound was also performed to locate the perforator vessels.The results of these two detecting methods were compared.A total of 16 clinical applications were performed.Results Before flap transplantation,the position of the blood vessels could be accurately located on thermal images.The skin temperature of the blood vessels running area was higher than the surrounding area,usually with the"hot spots"or"hot lines"on the thermal images.The result was confirmed by color Doppler ultrasound in all 16 cases.Intraoperative thermography could be used to determine whether the pedicle vessels were patency and observe the blood supply of distal flaps,by measuring the temperature of different regions on the flap.Postoperative thermal images were efficient in monitoring the blood supply of the flaps.By means of comparing the temperature of the flap and the surrounding normal skin,and recording the change of flap temperature over time,the flap microcirculation could be observed,which helps to detect the flap blood flow disorder early,so that interventions can be taken in time.Conclusion Dynamic infrared thermography is a non-invasive,economical,simple,intuitive and accurate auxiliary detection method.It’s practical in vascular localization and sensitive in intraoperative and postoperative blood supply monitoring.

Key words: Dynamic infrared thermography, Skin flap transplantation, Perioperative period