Fluoroscopic Imaging and Radiography Concepts

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Questions and Answers

What is the primary focus of fluoroscopic imaging?

Static imaging of structures

Enhancing image resolution

Dynamic imaging of physiologic events (correct)

Reducing radiation exposure

Which of the following describes size distortion in imaging?

The result of incorrect positioning of the object

The magnification of an object's true size

The misrepresentation of an object's true shape

The extension of an object's size beyond its true dimensions (correct)

What is one method caused by shape distortion?

Foreshortening

Elongation

Magnification

Both B and C (correct)

Which factors influence magnification in imaging?

Both OID and SID Signup and view all the answers

Which term is defined as the misrepresentation of an object's true size or shape?

Distortion Signup and view all the answers

What role does the glass envelope serve in the vacuum tube?

It creates a vacuum to eliminate air interference. Signup and view all the answers

What materials are used for the filament in the vacuum tube?

Tungsten due to its high melting point. Signup and view all the answers

What phenomenon occurs due to the resistance of the filament?

Thermionic emission resulting in electron release. Signup and view all the answers

What happens to the electrons once they are emitted from the filament?

They accelerate toward the positively charged anode. Signup and view all the answers

How is the space charge effect significant during the x-ray production process?

It allows sufficient electron accumulation before acceleration. Signup and view all the answers

What describes the main role of attenuation in radiography?

It refers to the reduction of radiation intensity as it passes through matter. Signup and view all the answers

Which of the following is NOT a factor influencing image quality in radiography?

Film type used Signup and view all the answers

Which type of image receptor system utilizes a photostimulable phosphor to store and later release latent image data?

Computed Radiography (CR) Signup and view all the answers

What is a consequence of detector saturation in digital radiography?

Production of a uniform blank image Signup and view all the answers

How does fluoroscopic imaging primarily differ from conventional radiography?

It allows real-time visualization of body structures. Signup and view all the answers

Which of the following is not an image receptor system mentioned in the content?

Direct capture system Signup and view all the answers

What is the main feature of a Digital Cassette-less System?

Operates without any film Signup and view all the answers

Which of the following factors is not considered a quality factor for image evaluation?

Texture Signup and view all the answers

Which image receptor system is currently on its way toward obsolescence?

Digital Cassette System Signup and view all the answers

What element is NOT part of the general X-ray process?

Radiation shield Signup and view all the answers

What percentage of the product at the target is x-rays?

1% Signup and view all the answers

What happens to electrons once they strike the target?

They transform into x-ray photons. Signup and view all the answers

What is primarily emitted when electrons collide with the target?

Heat Signup and view all the answers

What is the role of the filament in the x-ray tube?

To emit electrons that are accelerated towards the target. Signup and view all the answers

Which component is responsible for producing x-rays when electrons collide?

The target Signup and view all the answers

What is the primary function of the image receptor (IR) in x-ray production?

To capture and store X-rays for processing Signup and view all the answers

Which component is NOT necessary for producing X-rays?

Lead casing Signup and view all the answers

What distinguishes digital radiography (DR) from computed radiography (CR)?

DR captures images digitally without a cassette Signup and view all the answers

What is the purpose of the focusing cup within the x-ray tube?

To direct and focus the electron beam Signup and view all the answers

Which of the following systems is primarily considered obsolete in x-ray production?

Film-screen Signup and view all the answers

Which factor does NOT affect contrast in imaging?

Brightness settings Signup and view all the answers

What is the primary effect of patient motion on spatial resolution?

Causes blurring Signup and view all the answers

Which aspect influences the sharpness of an image the least?

Patient age Signup and view all the answers

How does the use of grids improve image contrast?

By absorbing scattered radiation Signup and view all the answers

What do window leveling and window width control in imaging?

The intensity of the light representing each pixel Signup and view all the answers

What does the Inverse Square Law indicate about the relationship between intensity and distance?

Intensity decreases as distance increases. Signup and view all the answers

How many gray levels are available with a bit depth of 6?

64 Signup and view all the answers

Which of the following factors directly affects the scale of contrast in an x-ray image?

kVp Signup and view all the answers

If the initial distance is 2 meters and the final distance is 4 meters, what is the ratio of the final intensity to the initial intensity based on the Inverse Square Law?

1:4 Signup and view all the answers

Which condition describes an image that is classified as 'too bright'?

Overexposure leading to loss of diagnostic information Signup and view all the answers

What happens to the primary beam as it passes through the body?

It is either absorbed or scattered. Signup and view all the answers

How does the density of material in the body affect photon attenuation?

Denser materials attenuate more photons than less dense materials. Signup and view all the answers

Which of the following factors influences image quality by affecting the photon quantity reaching the image receptor?

Source-to-image distance (SID) Signup and view all the answers

What is the role of radiolucent materials in X-ray imaging?

They allow photons to pass through relatively easily. Signup and view all the answers

Which equation correctly represents miliampere-seconds (mAs)?

mAs = (mA) x seconds Signup and view all the answers

What effect does increasing the mAs have on the image receptor exposure?

Increases the number of photons at the tube Signup and view all the answers

How does kVp impact the penetrability of x-rays?

Higher kVp increases penetrability Signup and view all the answers

What is the impact of distance on x-ray photon energy as it travels?

Photon energy decreases and the beam diverges with increased distance Signup and view all the answers

What does the '15% rule' indicate regarding kVp adjustments?

A 15% increase in kVp will double the exposure Signup and view all the answers

Which factor is NOT directly expressed by mAs in terms of x-ray production?

Quality of the x-ray photons Signup and view all the answers

Study Notes

Vacuum

The glass envelope (bulb) creates a vacuum which removes all air so gases may not interfere with production of x-rays.

Source of Electrons

The filament is a coil of thin tungsten wire due to its high melting point
Two filaments, one long, one short, depending on the exposure and detail
Filament creates resistance to the flow of electrons into the tube from the current
This resistance creates heat
The heat creates a thermonic emission
Electron cloud
Space Charge Effect

Method to Accelerate Electrons

Once the tube has heated from the current supplied, and the thermionic cloud has produced a space charge effect, the electrons are accelerated with high amounts of voltage
The negatively charged electrons (-) shoot toward the positively charged anode (+) because opposites attract
(a law of magnetism)

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Description

Test your knowledge on fluoroscopic imaging and the principles of radiography. This quiz covers topics such as image distortion, x-ray production, and the role of detectors. Prepare to explore the factors influencing image quality and the technology behind fluoroscopic systems.