The disclosed cranial flap clamp includes first and second clamping members and an extension member. The ultrasonic element array has three ultrasonic element rows with each of the three ultrasonic element rows including a plurality of ultrasonic elements arranged along a first direction and electrically connected to each other. An exemplary embodiment of a mounting has a respective holding device mounted to each mounting protrusion. After initially determining which method of de-interlacing to use, the invention continues to monitor the amount of motion in the data and changes the de-interlacing method if the amount of motion in the video data changes. The electric motor is located within the body and mechanically coupled to the ducted fan.