Abstract: An imaging agent delivery method and system thereof are provided. The method includes applying an imaging agent to a region, and alternately performing a heating process and a detecting process to the region with an ultrasound transmitting device and an ultrasound receiving device, respectively. Subsequently, an ultrasound signal acquired is processed by the ultrasound receiving device to obtain a temperature image of the region and a vaporization image of the imaging agent, such that the performance of the imaging agent can be monitored on the basis of the temperature image and the vaporization image.

Abstract: An infant playyard including a movable mattress which may be laid on the bottom of the playyard to support babies and also may be directly formed or folded into a U-shape to create a housing enclosure. The mattress is fastened to connecting elements for hanging on the upper peripheral rims of the playyard body to adjust the height of the mattress. Thus production cost may be reduced, package size does not increase, and carrying is easier. The connecting elements may also include an adjusting member to adjust the elevation to suit the user's height.