CHAPTER 7 X-RAY PRODUCTION

Current = number of electrons = quantity = mAs Energy = quality = kVp

WHAT HAPPENS WHEN ELECTRONS HIT THE ANODE I CM. –DISTANCE BETWEEN FILAMENT AND TUBE TARGET PROJECTIVE ELECTRONS TRANSFER THEIR ENERGY PENETRATE THE TARGET CONVERT KE INTO HEAT AND X-RAYS THE ELECTRONS THEMSELVES ARE CONDUCTED THROUGH THE X-RAY ANODE ASSEMBLY AND OUT.

ANODE HEAT INFRARED RADIATION NO TRANSFER OF ENERGY FROM ELECTRON EXCITES OUTER SHELL ELECTRON OF ANODE TARGET DOUBLE THE TUBE CURRENT = DOUBLE THE HEAT

Efficiency of x-ray production Increases with kVp See page 125

CHARACTERISTIC RADIATION USEFUL BEAM INNER SHELL At 100 kVp = 15% of the x-rays produced are characteristic At 65kVp = none are characteristic

BREMSTRAULUNG BRAKING At 65kVp all are bremstraulung

X-ray emission spectrum

The emission spectrum Large the “bump” = more quantity pg 131, figure 7-11 Farther to the right = more quality pg 131, figure 7-12 Added filtration decreases intensity but increases quality. Pg 132, figure 7-13 Increased atomic number of target Single phase vs three phase in efficiency and quality pg 134, figure 7-16