system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
For normal mammography, X-ray tube with a nominal focal size of-mm is used?
assistant
The correct answer is  Ans BIn general smaller the focal spot sharper the image Routinely focal spot size 0.3x0.3mm while magnification technique small focus of 0.1x0.1mm is used.