RPC F3

37問 • 1年前

問題一覧

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

occurs because of Compton Scattering, Photoelectric Effect, and x-rays transmitted through the patient

Differential Absorption

devices that receives the radiation leaving the patient to create an image

Image Receptors

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

If differential absorption is increased there will be: - ________ kVp - ________ image contrast - ________ patient dose

- decreased kVp - increased image contrast - increased patient dose

provide information to the image receptor.

Photoelectric Interactions

Contributes no useful information to the image results to image noise

Compton Scattered X-rays

comes from the patient and is a cause of occupational radiation

Scattered radiation

this produce the light areas in the radiograph

Photoelectric Interactions

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

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

The variations in absorption and transmission of the _____ _____ structurally REPRESENT the ANATOMIC AREA of interest.

x-ray beam

3 ways to create a radiograph image by differential absorption

- Beam Attenuation - Absorption - Transmission

occurs when the incoming x-ray photon has enough energy to remove an inner-shell electron

Complete Absorption

An ejected electron which also quickly loses energy by interacting with nearby tissues

Photoelectron

term used when the incoming x-ray photon passes through the anatomic part without any interaction with the anatomic structures

Transmission

The combination of absorption and transmission creates an image that represents the ________ _______

Anatomic parts

produces image fog and compromises the image if it strikes the image receptor.

Scattered radiation

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

Increasing _______ ________ ________ increases beam attenuation by absorption of scattering

Anatomic structure thickness

Increased _______ _______ ______ also increases x-ray beam attenuation

Tissue anatomic number

more likely to occur in tissues with higher anatomic number

X-ray absorption

Refers to the compactness of the anatomic particles comprising an anatomic part.

Tissue Density

Increased ______ _______ also increases beam attenuation

Tissue density

Increased _____ ______ ______ (energy) decreases beam attenuation

X-ray Beam Quality

The _________ of an x-ray beam affects its interaction with anatomic tissue

Penetrability

______ _______ ______ more likely to be transmitted through anatomic tissue without interacting with the tissue's anatomic structures.

Higher energy xrays

Results from Compton effect (incoming photons in the diagnostic range loses energy during interactions with the atoms comprising the tissue

Scatter Radiation

Increasing the x-ray energy will result in the decrease of _______ ________ , but increase Compton scattering percentage

Photon absorption

Reducers of Scatter Radiation on Image

- Use of Beam Restriction - Use of Grid - Use of Air Gap Technique

what happens when tissue thickness is increased attenuation - absorption - transmission -

attenuation - increase absorption - increase transmission - decrease

what happens when tissue anatomic number is increased attenuation - absorption - transmission -

attenuation - increase absorption - increase transmission - decrease

what happens when tissue density is increased attenuation - absorption - transmission -

attenuation - increase absorption - increase transmission - decrease

what happens when xray beam quality is increased attenuation - absorption - transmission -

attenuation - decrease absorption - decrease transmission - increase

reduction in the energy or number of photons in the primary beam

Attenuation

called as the x-ray beam passes through anatomic tissue, it loses some of its energy

Beam Attenuation

called when some x-ray photons are absorbed as the energy of the primary beam is deposited within the atoms comprising the tissue

Absorption

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