A device positionable in a cavity of a bodily organ may discriminate between fluid and non-fluid tissue to provide information or a mapping indicative of a position andor orientation of the device in the cavity. The vehicle has one or more computers that monitor the steering angle and that are also capable of independently controlling a right braking unit and a left braking unit. They are rigidly assembled to one another. This method can reduce trouble occurring in manufacture to realize a radiation detector simply. , can be used to shape the financial plan to make it more effective and efficient. A diffuser and brightness enhancing film are situated at the opening of the aperture between the aperture and the display to be backlit.