Interventional Radiology: Digital Subtraction Techniques

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What is temporal subtraction in interventional radiology?

Temporal subtraction is a computer-assisted technique where an image obtained at one time is subtracted from an image obtained at a later time to enhance the pattern of contrast media.

What are the variables required for temporal subtraction?

The variables required for temporal subtraction are the same patient position, same anatomy, same radiographic distance, and same exposure factors.

What is the purpose of temporal subtraction in interventional radiology?

The purpose of temporal subtraction is to visualize certain information on an angiogram by removing non-essential structures, thereby allowing for better visualization of the opacified vessels.

What is the mask in the context of temporal subtraction?

The mask is the preliminary image, recorded before the introduction of the contrast agent, which serves as the reference for subsequent subtraction.

How does temporal subtraction enhance the visualization of contrast media?

Temporal subtraction enhances the visualization of contrast media by eliminating non-essential structures and highlighting the opacified vessels in the subsequent images.

What are the different types of digital subtraction mentioned in the text?

The different types of digital subtraction mentioned in the text are temporal subtraction, energy subtraction, and hybrid subtraction.

What is a diapositive mask?

An exact copy of the base film, but with the densities reversed.

What is the basis for the theory behind the subtraction methods in radiography?

Attenuation differences of the various types of tissue and the iodine in the contrast.

How is the final subtraction print created in temporal subtraction methods?

Diapositive mask + Angiogram film

What must the generator be capable of for temporal subtraction methods?

Switching kilovoltage during exposures and changing filtration system.

What is the advantage of using diapositive mask in subtraction methods?

Reduction of motion artifacts.

What is the purpose of creating contrast films at different energies (kVp) in the shortcut method?

To subtract the contrast films and highlight structures with radiographic contrast.

Why does a film with only one density not show an image?

Because details are visible due to density differences.

What are the various modes of temporal subtraction mentioned in the text?

Serial mask mode, continuous mask mode, time interval difference, and postprocessing subtraction.

What is the definition of contrast in the context of radiography?

The difference between densities in adjacent areas.

What is the role of contrast films in the shortcut method for subtraction?

To highlight structures with radiographic contrast and remove confusing shadows.

Learn about digital subtraction techniques in interventional radiology, including temporal subtraction, energy subtraction, and hybrid subtraction. Understand how these techniques enhance the visualization of angiogram information by removing non-essential structures and highlighting the pattern of contrast media.

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