This paper reports the temperature indicator for surgical simulator and temperature calculation method using image processing for visualization of temperature increase and distribution in the model. The indicator consists of polydimethylsiloxane (PDMS) and thermochromic pigment presenting non-reversible color change according to temperature increase. The indicator has transparency to observe the catheter inside the model during simulation. Temperature change of color indicator is calculated from the color change using several color space such as YCrCb and HSV color space. The range of the indicator is from 50 to 110 degree of C. The accuracy of the temperature measurement is approximately 2.0 degrees of C. Temperature distribution of ablated model was measured (Ablation temperature: 90 degree of C. Ablation duration: 10 seconds.). Finally, temperature change measurement of ablated tube-shape model was demonstrated.
