Concerning mammography true statement is:
A. The maximum (peak) energy in the X-Rayspectrum is determined by the characteristicradiation from molybdenumB. A K-edge filter is used
C. The ideal radiation is 30 keV
D. Typical mean glandular breast dose from a singlefilm is 10mGy
E. a focus to film distance of 100 cm is used
The answer is. B. A K-edge filter is used
The
maximum energy in the X-ray spectrum is determined bythe peak tube potential
(kVp) across the X-ray tube. Lowenergies (18–20 keV) are required in order to
distinguish thesoft tissues by photoelectric interaction. The target
materialused is molybdenum. It produces characteristic radiation of17.9 keV and
19.5 keV. A K-edge beam filter ofmolybdenum is used to reduce all other energy
X-rays in thespectrum as the filter is relatively transparent to its own characteristic
(K-edge) radiation.Typical glandular breast dose from a single film is less
than2mGy.A focus to film distance of approximately 60 cm is used.
