In a valve-equipped hand switch and a chemical liquid introduction system, a contrast medium in a syringe is delivered to a patient line through a first port, a main passage around a spacer portion, and a second port. A substrate having a gate oxide layer, a gate electrode and spacers attached to the sidewalls of the gate electrode is provided. In the same manner, a plurality of data driver boards are bonded to a second side of the TFT substrate, and a wiring board made of a flexible printed wiring board is bonded between the data driver boards. A power-on reset mixer is configured to synthesize the power sensing signal and the radio frequency sensing signal and outputs a power-on reset signal according to the voltage levels of the power sensing signal and the radio frequency sensing signal. A computerized region classification method using the region features and the pattern score recipe to generate pattern scores output.