Intro to Radiography
Radiographic Equipment
Radiology Math/Physics
X-ray Production
Image Quality
100
Wilhelm Conrad Roentgen
Who discovered x-rays?
100
Image Receptor System
What is the system that contains the x-ray film and the film holder? Cassette
100
Exposure Formula for determing mAs
What is mA X Time = mAs
100
Tungsten
What is the metal element (W) that is used for the target in the anode?
100
Density
What is the overall blackness or darkness called on a x-ray? mA controls this.
200
JRCERT
What organization accredits schools of Radiologic Technology? Joint Review Committee on Education in Radiologic Technology
200
Latent Image
What is the "unseen" image on the x-ray film called?
200
Inverse Square Law
What is the law that radiation intensity is inversely proportional to the square of the distance?
200
Anode Cathode
What are the positive (Anode) and negative (Cathode) ends of the x-ray tube.
200
Quantum Mottle
What is the term used to describe a grainy or hi noise image? This is a problem when very fast IR systems are used with very short exposure times (hi mA, hi kVp) Not enough photons to activate phosphors in the screen. Thus a decrease in recorded detail.
300
ASRT
What is the world's oldest radiologic science professional organization? American Society of Radiologic Technologist
300
Scatter Radiation
What radiation is scattered or created as a result of the attenuation of the primary x-ray beam?
300
Ionization
What process happens when a neutral atom gains or loses an electron and the electric charges of its protons and electrons are no longer equal?
300
Bremsstrahlung Radiation
What is braking radiation that is heterogeneous (made up of many different wavelengths) and makes up most of the primary beam. The other is Characteristic Radiation which only happens if the kVp is over 70.
300
Contrast
What is the difference in radiographic density between adjacent portions of an image. kVP controls contrast
400
ARRT
What is the organization that establishes standards and examinations to certify radiologic technologists? American Registry of Radiologic Technologists
400
Remnant Radiation
What remains of the primary beam after it has been attenuated by matter? The pattern of this radiation creates the image.
400
Rectification
What is the process when Alternating Current can be converted so that it flows in one direction only?
400
The Anode Heel Effect
What result happens when there is an uneven distribution of radiation intensity in the x-ray beam? More intensity on the cathode than on the anode side.
400
OID
What is Object-image receptor distance. The distance between the object being x-rayed and the cassette. As OID is increased, magnification increases and distortion of the part occurs.
500
Attenuation
What is the absorption of the x-ray beam called?
500
BUCKY
What is the grid device located under the table surface that protects the IR from being fogged by scatter?
500
Thermionic Emission
What is when tungsten is heated in the filament, the electrons in the tungsten atom orbits spin faster moving farther from the nucleus. Electrons in outer orbits are flung out of the atom, forming an "electric cloud" or space charge. The space charge provides the electron source for x-ray production.
500
Filtration
What is process of removing the long-wavelength photons from the x-ray beam so the patient does not absorb this unwanted radiation?
500
Penumbra
What is unsharp edges of the umbra or body part being x-rayed. The blur or geometric unsharpness of the image around the edges.
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