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RTE: 1100 Radiology Physics Final Exam With Questions And 100% SURE ANSWERS
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JACKLINERTE: 1100 Radiology Physics Final Exam With Questions And 100% SURE ANSWERS
Terms in this set (74)
the reduction in X-ray intensity that results from absorption and scatter. Most commonly reduced
what is Attenuation
in increments half for every 5 cm.
Compton Scatter outer shell interaction. Ionizes. Ejects Compton electron. Contributes to scatter.
Photoelectric Absorption inner K shell interaction. Ionization. Total absorption to create contrast.
Classical or Thompson <10kev. No ionization. Slightly increase the patient dose. Contributes to
Coherent Scatter
noise.
seen in PET and Nuc Med. 1.02mev. interacts with the nucleus and produces 2 electrons - positron
Pair Production
and electron.
Photodisintegration > 10mev. Total absorbed. Emits nuclear fragments.
Radiographic Units Radiation in air - Gya , Radioactivity - becquerel , Effective Dose - Sievert , Absorbed Dose - Gyt
Types of Radiation Sources Radon = natural 50% of exposure, X-ray / medical = man-made
RTE: 1100 Radiology Physics Final Exam
1/5
, Atom smallest particle of an element
Photon the smallest part of electromagnetic energy
Wavelength length from one crest to the next
Amplitude the height of the wave
Frequency number of waves that pass a point in one cycle.
Velocity d/t 3x10^8m/s
Step up transformer high-voltage transformer, volts-kilovolts, steps down current.
Step down transformer filament transformer, kilovolts-volts, step-up current.
Autotransformer distributes to high and filament transformers. uses electromagnetic induction
AECs Terminate the exposure once enough radiation has reached the IR. Used to ensure consistency.
Rectifier converts AC to DC, accelerates electrons from cathode to anode.
Generator converts mechanical energy into electrical energy.
Motor converts electrical to mechanical.
Transformer devices to increase or decrease voltage.
Filament heats to the point of 'boiling off' electrons to produce a space charge of the electron
Thermionic Emission
cloud. Determines mA.
Characteristic Interaction inner shell electron removed. Characteristic cascade. K shell useful
incident electron slows and changes direction around the nucleus. Emits 1/3 of KVP into a photon.
Bremsstrahlung Interaction
Most used in diagnostic.
Window Level leveling, brightness.
Window Width windowing, contrast.
Latent image image after exits patient and reaches IR.
Manifest image RTE: 1100 Radiology Physics Final
final image afterExam
processing.
2/5
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