Type of mouse that has a ball located on the bottom that rolls around on a flat surface as the mouse is moved. Sensors inside the mouse determine the direction and distance of the movement - Input. Optical mouse. Type of mouse that uses a laser to detect the mouse's movement and has no moving parts - Input.
The Strategic Defense Initiative (SDI) was a proposed missile defense system intended to protect the United States from attack by ballistic strategic nuclear weapons (Intercontinental ballistic missiles and Submarine-launched ballistic missiles).
SDI Diagnostic Imaging. 1  SDI Diagnostic Imaging (Stern, Drake, Isbell & Associates, PA) is a Tampa Bay area-based full service Radiology Group that has been dedicated to providing quality healthcare imaging services since 1967. Our board-certified and subspecialty fellowship-trained radiologists strive to provide the highest levels of care to our community.