問題一覧
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process whereby some of the x-ray beam is absorbed in the tissue and some passes through the anatomic part and is received by the image receptor.
Differential Absorption
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occurs because of Compton Scattering, Photoelectric Effect, and x-rays transmitted through the patient
Differential Absorption
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devices that receives the radiation leaving the patient to create an image
Image Receptors
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Three important types of x-rays to make a radiograph 1. scattered by ______ _______ 2. Absorbed _________ 3. transmitted through _____ without interaction
1. scattered by Compton Interaction 2. Absorbed photoelectrically 3. transmitted through patient without interaction
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If differential absorption is increased there will be: - ________ kVp - ________ image contrast - ________ patient dose
- decreased kVp - increased image contrast - increased patient dose
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provide information to the image receptor.
Photoelectric Interactions
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Contributes no useful information to the image results to image noise
Compton Scattered X-rays
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comes from the patient and is a cause of occupational radiation
Scattered radiation
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this produce the light areas in the radiograph
Photoelectric Interactions
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does not reach the image receptor as this interaction is absorbed by the body. Represents anatomy with high x-ray absorption characteristics are also called radiopaque (meaning they appear white in the image)
Photoelectric Interactions
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created by passing an x-ray beam through the patient and interacting with an image receptor such as an imaging plate in computed radiography.
Radiographic image
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The variations in absorption and transmission of the _____ _____ structurally REPRESENT the ANATOMIC AREA of interest.
x-ray beam
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3 ways to create a radiograph image by differential absorption
- Beam Attenuation - Absorption - Transmission
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occurs when the incoming x-ray photon has enough energy to remove an inner-shell electron
Complete Absorption
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An ejected electron which also quickly loses energy by interacting with nearby tissues
Photoelectron
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term used when the incoming x-ray photon passes through the anatomic part without any interaction with the anatomic structures
Transmission
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The combination of absorption and transmission creates an image that represents the ________ _______
Anatomic parts
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produces image fog and compromises the image if it strikes the image receptor.
Scattered radiation
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term used for when the attenuated x-ray beam leaves the patient's body also known as REMNNANT RADIATION and is COMPOSED OF both TRANSMITTED and SCATTERED RADIATION
Exit Radiation
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Increasing _______ ________ ________ increases beam attenuation by absorption of scattering
Anatomic structure thickness
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Increased _______ _______ ______ also increases x-ray beam attenuation
Tissue anatomic number
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more likely to occur in tissues with higher anatomic number
X-ray absorption
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Refers to the compactness of the anatomic particles comprising an anatomic part.
Tissue Density
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Increased ______ _______ also increases beam attenuation
Tissue density
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Increased _____ ______ ______ (energy) decreases beam attenuation
X-ray Beam Quality
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The _________ of an x-ray beam affects its interaction with anatomic tissue
Penetrability
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______ _______ ______ more likely to be transmitted through anatomic tissue without interacting with the tissue's anatomic structures.
Higher energy xrays
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Results from Compton effect (incoming photons in the diagnostic range loses energy during interactions with the atoms comprising the tissue
Scatter Radiation
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Increasing the x-ray energy will result in the decrease of _______ ________ , but increase Compton scattering percentage
Photon absorption
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Reducers of Scatter Radiation on Image
- Use of Beam Restriction - Use of Grid - Use of Air Gap Technique
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what happens when tissue thickness is increased attenuation - absorption - transmission -
attenuation - increase absorption - increase transmission - decrease
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what happens when tissue anatomic number is increased attenuation - absorption - transmission -
attenuation - increase absorption - increase transmission - decrease
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what happens when tissue density is increased attenuation - absorption - transmission -
attenuation - increase absorption - increase transmission - decrease
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what happens when xray beam quality is increased attenuation - absorption - transmission -
attenuation - decrease absorption - decrease transmission - increase
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reduction in the energy or number of photons in the primary beam
Attenuation
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called as the x-ray beam passes through anatomic tissue, it loses some of its energy
Beam Attenuation
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called when some x-ray photons are absorbed as the energy of the primary beam is deposited within the atoms comprising the tissue
Absorption