Molybdenum In Mammography

Molybdenum and Rhodium Energy Spectra Fig. 4.2. Typical x-ray emission spectra used in screen-film mammography. For the molybdenum Mo target, a 0.03 mm molybdenum filter is used and a 26 kVp setting is shown solid line . For greater penetration, a rhodium Rh filter can be used as shown here dotted line . For very dense breasts, a Rh target and Rh filter x-ray source operated at 30 to 32 kVp may be useful. The dominant characteristic x-ray peaks Ka occur at 17.4 keV for a molybdenum target and...

Half-field Geometry In Mammography

Ray Tube Horn Angle

Therefore, in order to compare measured and nominal focal-spot sizes, the measurement made at the chest wall needs to be corrected to estimate its size at the reference axis. The reference axis usually bisects the angle formed by the x-ray tube target and the ray perpendicular to the image receptor at the chest-wall edge of the image receptor . Thus, for an x-ray tube with an effective target angle of 22 degrees target angle of 16 degrees plus a tube tilt of six...