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Imaging Ch.4

Electrmagnetic Energy

TermDefinition
Photon The smallest quantity of any type of electromagnetic radiation.
A __________ may also be called a quantum Photon.
Amplitude One half the range from crest to valley over which the sine wave varies (crest - top , valley - bottom)
Frequency The number of wavelengths passing a point per second
Measured in Hz Frequency
Wavelength The distance from one point on the sine wave to the next corresponding point (crest to crest or valley to valley etc.)
The Wave Equation Velocity = Frequency x Wavelength
The Wave Equation At a given velocity, frequency and wavelength are inversely proportional.
Electromagnetic Spectrum A chart that describes the energies, frequency and wavelengths of electromagnetic energy.
Wave particle duality When the photon behaves both as a particle and a wave.
Attenuation The reduction in the total number of x-ray photons remaining in the beam after passing through a given thickness of material.
Reflection X-ray photons that bounce off matter in the same direction that it was interacted with.
Absorption X-ray photons that are totally absorbed by matter.
Radiopaque Structures that absorb x-rays.
Radiolucet Structures that attenuate x-rays.
Inverse Square Law Radiation intensity is inversely related to the square of the distance from the source. I 1 = (d2)2 I 2 (d1)2
Law of conservation of matte Matter cannot be created or destroyed.
Law of conservation of energy Energy cannot be created or destroyed.
X-ray Photon Is a quantum of electromagnetic energy.
The velocity of all electromagnetic radiation is ____________. 3 x 10^8 m/s
At a given velocity, ________________ & ______________ are inversely proportional Wavelength; frequency
What is not a part of the electromagnetic spectrum Diagnostic ultrasound
The energy of a photon is directly proportional to its ______________________. Frequency.
Is identified by wavelength, radio frequency is identified by frequency and x-rays are identified by energy Visible light.
Interact with matter most easily when the matter is approximately the same size as the photon wavelength Photons
__________ behave as though they are particles x-rays
Visible light Behaves like a wave.
Electromagnetic energy attenuation Is the reduction in intensity that results from scattering and absorption.
The inverse square law can be applied to distances greater than ____ times the longest dimension of the source. 7
The _________ of electromagnetic radiation is inversely related to the square of the distance of the source. Intensity.
Is a discrete bundle of energy X-ray Photon
The _________ of a photon is directly proportional to its frequency Energy.
Created by: sassyrad
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