![]() ![]() When the free-electron hits the tungsten anode target, two main things happen: The free electrons released from cathode filament (via thermionic emission) are accelerated towards the anode. Most x-ray tube anodes are made of tungsten (Z=74 atomic number), which has a high melting point 3370 oC with a low rate of evaporation. The anode of the x-ray tube is where x-rays are produced. What are the energies of gamma rays released from the radioactive decay of 99mTc and F-18.ĭescribe how the “Bremsstrahlung Radiation” and “Characteristic Radiation” are produced.What is the difference between an X-ray photon and gamma rays?.The perspective from a frequency, wavelength and/or photon energy should be used. Describe the electromagnetic spectrum, paying particular attention to the radiation used in mammography and general radiography/CT imaging.What is the equation to calculate Bucky Factor?.Define Primary Transmission Factor, Scatter Transmission Factor, and Selectivity of Anti-scatter Grids.Define Contrast Improvement Factor of Anti-Scatter Grids.Define grid ratio and provide examples for different kVp studies?.Describe the three different grid structures.What materials are used to make a grid?.Where is the grid in relation to the ionisation chambers and detector ?.Briefly explain how an anti-scatter grid works, the equation for the grid ratio and the types of anti-scatter grids.Describe how the AEC in general radiography works.What is the definition of half-value layer (HVL)?.What is the definition of Mass Attenuation Coefficient (MAC)?.What is the definition of Linear Attenuation Coefficient (LAC)?.Between aluminum, copper, tin and lead, which filter would be the thinnest to provide the same amount of beam filtration?.Explain the anode heel effect and methods to reduce the anode heel effect.In the context of a CXR acquisition, explain how many AEC chambers there are and how these can be used effectively?.Explain how an AEC functions for a digital radiography system?.What are the three shapes of additional filters for x-rays?.Discuss why additional filtration is required during a CXR.What four parts of the X-ray tube contribute to inherent filtration?.Describe the types of generators and their effect on the X-ray spectra.Why is a higher kV or higher filtration used for barium studies?.What is meant by the K-edge and how does it arise?.List three methods used to reduce the effects of Compton Scatter:.Describe the major X-ray photon interaction that creates scattered radiation and why this is a concern in radiology.For the two most common interactions, explain what factors affect the likelihood of the interactions occurring? Explain the three major interactions of X-rays with tissue during a diagnostic X-ray.Describe the difference between the “Photoelectric Effect” and “Characteristic Radiation” x-ray production.What do the x-axis and y-axis of an X-ray spectrum represent?.Which one has higher energy and higher quantity in an unfiltered x-ray spectrum? Explain what a K-alpha and a K-beta Characteristic X-ray are in relation to a tungsten target electron.Describe how the “Bremsstrahlung Radiation” and “Characteristic Radiation” are produced. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |