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Questions and Answers
What is the typical tube voltage range used by mammographic X-ray tubes for normal-sized breasts?
What is the typical tube voltage range used by mammographic X-ray tubes for normal-sized breasts?
- 15 to 18 kVp
- 20 to 22 kVp
- 25 to 28 kVp (correct)
- 30 to 35 kVp
Which anode target material is NOT mentioned as being used in mammography?
Which anode target material is NOT mentioned as being used in mammography?
- Molybdenum (Mo)
- Rhodium (Rh)
- Tungsten (W)
- Lead (Pb) (correct)
For what reason are tube currents in mammographic X-ray tubes lower than those in radiographic tubes?
For what reason are tube currents in mammographic X-ray tubes lower than those in radiographic tubes?
- Risk of overheating (correct)
- Increased output efficiency
- Improved image resolution
- Larger focal spot sizes
What is the role of beryllium in mammographic X-ray tubes?
What is the role of beryllium in mammographic X-ray tubes?
Which of the following focal spot sizes is typical for the small filament in mammographic X-ray tubes?
Which of the following focal spot sizes is typical for the small filament in mammographic X-ray tubes?
What is a key advantage of using tungsten (W) as an anode target material in digital mammography?
What is a key advantage of using tungsten (W) as an anode target material in digital mammography?
What characteristic X-ray energy does molybdenum (Mo) primarily produce?
What characteristic X-ray energy does molybdenum (Mo) primarily produce?
What is the primary purpose of the added beam filters in mammographic X-ray tubes?
What is the primary purpose of the added beam filters in mammographic X-ray tubes?
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Study Notes
Mammographic X-Ray Tube
- Voltage is low, around 25-28 kVp.
- Produces X-rays primarily around 20 keV energy, essential for breast imaging.
- Cathode has two filaments for two focal spot sizes, 0.3 mm (large) and 0.1 mm (small).
- Focal spots are much smaller than radiographic tubes, requiring lower tube currents to prevent overheating.
- Anode is often made of Molybdenum (Mo) or Rhodium (Rh), generating characteristic X-rays near 20 keV.
- ** Tungsten (W)** is gaining popularity in digital mammography.
- Provides better X-ray production efficiency and heat handling.
- Less reliance on characteristic X-rays due to digital detectors' adaptability.
- Beam Filters are crucial for shaping the X-ray beam.
- Beryllium (Be) tube port absorbs low-energy X-rays that do not penetrate the breast.
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