The SSD in diagnostic mobile radiography must not be less than which of the following measurements?

• A. 10 in; 25 cm
• B. 12 in; 30 cm
• C. 14 in; 35 cm
• D. 16 in; 40 cm

Answer: (B)

In diagnostic mobile radiography, the Source-to-Skin Distance (SSD) is a critical parameter that influences the quality of the radiographic image and patient safety. The recommended minimum SSD of 12 inches (30 cm) ensures that the radiation dose to the patient is minimized while also maximizing image quality.

When the SSD is too short, it can result in several negative outcomes: the patient receives a higher radiation dose due to the proximity of the X-ray tube, and the degree of scatter radiation can increase, leading to a decrease in image clarity. By maintaining a minimum SSD of 12 inches, mobile radiography practices can adhere to safety standards, ensuring both effective imaging and the protection of patients from unnecessary radiation exposure.

This measurement is widely endorsed in radiographic guidelines to promote safe practices while meeting diagnostic requirements. Therefore, recognizing and adhering to this minimum SSD is essential for ensuring compliance with best practices in mobile radiography.