2 out of 5 ways/mechanisms that are most important in diagnostic imaging radiography

Difference of Compton and Photoelectric Effect

what do X-rays interact through matter as

Xrays have very _____ wavelengths

wavelengths of X-rays

The higher the energy of x-rays, the ________ the wavelength

X-rays that tend to interact with whole atoms

X-rays that generally interact with electrons

X-rays that interact with nuclei

5 Mechanisms For X-Ray Interaction

Coherent Scattering was discovered by ___________ also known as _______ or ________ scattering Energy below ___ keV

________ scattering is of little importance in diagnostic radiology as it involves low energy x-rays and does not contribute to medical image production ________ Scattering - involves a single electron in the interaction ________ Scattering - results from a cooperative interaction with all the electrons of an atom

The incident ____ interacts with the _______ causing it become excited.

This immediately releases this excess energy as a scattered x-ray with wavelengths equal to that of the incident x-ray and therefore of equal energy.

Direction of the scattered x-ray is _______ from that of the incident x-rays (different or same)

The result of COHERENT SCATTERING is a change in ______ of the x-ray without a change in its ________

Most coherently scattered x-rays are scattered in the what direction?

Some coherent scattering occurs at __ kVp and contributes slightly to image noise which reduces image contrast

Occurs when x-rays throughout the diagnostic range undergo interactions with the outer shell electrons that not only scatters the x-ray, but also reduces its energy.

What do you call the outer shell electron ejected by incident x-rays?

The energy of the ejected electron is ____ to its binding energy plus the kinetic energy with which it leaves the atom.

This type of x-rays are absorbed photoelectrically.

__________ loses all of its kinetic energy through ionization and excitation and drops into a vacancy in an electron shell previously created by some other ionizing event.

X-rays that are scattered back in the direction of the incident x-ray beam

_________ reduces image contrast (Increases Image Fog)

- This interaction in tissue can occur in all x-rays and therefore of considerable importance in X-ray imaging. - Results in occupational exposure for radiologic technologists.

As x-ray energy increases with loosely bound electrons there will be increased what?

As mass density of absorber increases there will be _______ increase in compton scattering

- Occurs when x-rays in the diagnostic range undergo ionization interactions with INNER SHELL ELECTRONS - Responsible for producing contrast on the radiograph - only occurs if the incident x-ray has energy equal to or greater than the electron binding energy

electrons removed from the atom and escapes with kinetic energy equal to the difference between the energy of the incident x-ray and the binding energy of the electron

are produced after photoelectric interaction

What happens to the Photoelectron kinetic energy when dealing low atomic number?

What happens to the Photoelectric kinetic energy when dealing with High Atomic Number

Ejection of K-shell photoelectron by _______ results in vacancy in the K-shell.

_______ fills in the vacant space accompanied by emission of x-rays

Characteristic x-rays may consist of __________ and behave as __________

Energy of these characteristic x-rays is inverse to the difference between binding energies of the shells involved. TRUE OR FALSE

- Does not occur during x-ray imaging. - Occurs when x-rays have sufficient energy to escape electron interaction and come close enough to the nucleus of an atom. - Observed in Positron Emission Tomography.

2 particles produced by x-ray when they disappear during pair production

Incident x-ray energy with unit during pair production

Electron energy with unit during pair production

The process called when a positron unites with a free electron and the mass of both particles is converted into energy

 Energy is greater than 10 MeV.  Does not occur in diagnostic radiography.

energy (with unit) needed by x-rays to escape interaction and be absorbed directly by the nucleus

Atomic Number of Fat - Tissue - Lung - Bone -

Atomic number of contrast materials? Air - Iodine - Barium -

Atomic Number of Others Concrete - Molybdenum - Tungsten - Lead -

Energy of the following Coherent Scattering - Compton Scattering - Photoelectric Effect - Pair Production - Photodisintegration -

Part of Interaction of the following Coherent Scattering - Compton Scattering - Photoelectric Effect - Pair Production - Photo-disintegration -

Product of the following Coherent Scattering - Compton Scattering - Photoelectric Effect - Pair Production - Photo-disintegration -

Effect of the following Coherent Scattering - Compton Scattering - Photoelectric Effect - Pair Production - Photo-disintegration -