American Society of Radiologic Technologist (ASRT) Practice Exam

The fluoroscopic foot switch is a:

1. positive-pressure switch

2. negative-pressure switch

3. toggle switch

4. variable resistor

The correct answer is: positive-pressure switch

The fluoroscopic foot switch is classified as a positive-pressure switch. This type of switch operates by creating a circuit when pressure is applied, allowing for seamless control of the fluoroscopy system without the need for the technologist to use their hands. When the foot pedal is pressed down, it activates the fluoroscopic equipment, facilitating continuous imaging as long as pressure is maintained. This design is particularly advantageous in a clinical setting, as it allows the radiologic technologist to remain focused on the procedure while managing the imaging system efficiently. In contrast, other types of switches, such as toggle switches or variable resistors, do not provide the same hands-free functionality that is essential during fluoroscopy. Additionally, negative-pressure switches are designed differently, typically requiring the release of pressure to activate, which is not suitable for the continuous imaging process of fluoroscopy. Thus, the positive-pressure design aligns perfectly with the operational needs of fluoroscopic imaging.