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X-RAY EMISSION SPECTRUM. X-RAY PRODUCTION BREMSTRAHLUNG RADIATION CHARACTERISTIC RADIATION.

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Presentation on theme: "X-RAY EMISSION SPECTRUM. X-RAY PRODUCTION BREMSTRAHLUNG RADIATION CHARACTERISTIC RADIATION."— Presentation transcript:

1 X-RAY EMISSION SPECTRUM

2 X-RAY PRODUCTION BREMSTRAHLUNG RADIATION CHARACTERISTIC RADIATION

3 BREMS

4 BREMS EMISSION- CONTINUOUS

5 Characteristic Radiation

6

7 CHARACTERISTIC EMISSION- LESS POLYENERGETIC

8 X-RAY EMISSION SPECTRUM BREMS INTENSITY X-RAY ENERGY

9 X-RAY EMISSION SPECTRUM BREMS INTENSITY X-RAY ENERGY K-CHARACTERISTIC L-CHARACTERISTIC

10 X-RAY EMISSION SPECTRUM CHARACTERISTIC BREMS

11 MAXIMUM ENERGY OF AN X-RAY IN THE BEAM = kVp OF OPERATION kVpeak

12 GREATEST # OF PHOTONS IS EMITTED WITH ENERGY: APPROX. 1/3 OF MAX PHOTON ENERGY

13 FOUR PRINCIPAL FACTORS INFLUENCING THE SHAPE OF AN X- RAY EMISSION SPECTRUM: ELCTRONS TRAVELING FROM CATHODE TO ANODE HAVE DIFFERENT ENERGIES– NOT JUST PEAK ENERGY THE TARGET IS RELATIVELY THICK– CAUSING MULTIPLE INTERACTIONS. LOW ENERGY X-RAYS ARE MORE LIKELY ABSORBED IN THE TARGET EXTERNAL FILTRATION REMOVES LOW ENERGY PHOTONS

14 MINIMUM VAVELENGTH MAX. X-RAY ENERGY MIN. = 12.4 * 10 –10 kVp m nm DIVIDE BY 10 –9

15 FACTORS AFFECTING THE X-RAY EMISSION SPECTRUM TUBE CURRENT TUBE VOLTAGE ADDED FILTRATION TARGET MATERIAL VOLTAGE WAVEFORM

16 TUBE CURRENT CHANGE

17 CURRENT CHANGE CURRENT INTENSITY ENERGY – NO CHANGE 2 * mA = 2 * number of photons 4 * mA = 4 * number of photons

18 Tube voltage

19 Tube voltage (kVp) CHANGE kVp INTENSITY ENERGY – 15% INCREASE OF KVP = 2 * mAs

20 FILTRATION CHANGE 2.5 mm 4 mm

21 FILTRATION CHANGE FILTRATION INTENSITY ENERGY –

22 TARGET MATERIAL CHANGE TUNGSTEN MOLYBDENUM 70

23 74W (14) (50) 75Re (43) (89) 76Os (90) (95) 77Ir (96) (10) 78Pt (20) (21) 79Au (22) (18) 80Hg (17) (18) 81Tl (12) (13) 82Pb (24) (17) 83Bi (92) (22) K-CHARACTERISTIC ENERGY FOR DIFFERENT TARGETS

24

25 TARGET CHANGE TARGET MATERIAL Z # INTENSITY ENERGY CHARACTERISTIC RADIATIONCHANGE

26 VOLTAGE-WAVEFORM CHANGE 3-PHASE 1-PHASE

27 VOLTAGE WAVEFORM CHANGE VOLTAGE WAVEFORM INTENSITY ENERGY OPERATION ON 3-PHASE EQUIPMENT = 12% * SINGLE PHASE

28 PATIENT DOSE SINGLE PHASETHREE PHASE>


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