Computed Tomography (CT)

Contrast to Computed Tomography (CT), Conventional Radiography (CR) is limited because:

• Its imposing a 3D subject onto a 2D plane, many objects overlap each other and hard to tell apart

• Its imposing a 2D subject onto a 3D plane, many objects overlap each other and hard to tell apart

• Its imposing a 3D subject onto a 2D plane, many objects never appear and hard to decipher

• Its imposing a 2D subject onto a 3D plane, many objects never appear and hard to decipher

Contrast to Computed Tomography (CT), Conventional Radiography (CR) is limited because:

• Limited differentiation of every single density; example: Metal and air look the same

• Limited differentiation of different densities; example: water and soft tissue look the same

Contrast to Computed Tomography (CT), Conventional Radiography (CR) is limited because:

• Only 3 densities can be differentiated

• Only 5 basic densities can be seen at all

• Only 5 basic densities can be differentiated

• Almost no density can be differentiated

Computed Tomography (CT) is best appreciated when:

• Imaging the outer parts of the brain

• Imaging the whole head

• Imaging the back

• Imaging the skull

What is the main purpose?

• To image the brain since you can't see the brain on CR

• To image anything because of how effective it is

• To be the more efficient version of CR

• All the above

Why can't you see the brain on Conventional Radiography?

• You can, but it's too blurry

• The brain (soft tissue) is bathed in cerebral spinal fluid (water), so impossible to tell the difference

• The brain's cerebral spinal fluid isn't detectable on CR

• Scientists still don't know why

Why can't you see the brain on Conventional Radiography?

• You can, but it's too blurry

• The bony density of the skull is mixed up with other densities

• The bony density of the skull reduces many of the x rays that go though it

• Scientists still don't know why

Who discovered Computed Tomography (CT) imaging?

• Benjamin Barlowe Newbold

• Sir Benjamin Barlowe Hounsfield

• Godfrey Hounsfield Laurier

• Sir Godfrey Newbold Hounsfield

What is the CT-Hounsfield Unit? (2 correct answers)

• A value used to measure density on CT scans, a measure of radiodensity

• A value used to measure impact on CT scanners, unit of radiography

• HU: Hounsfield Unit

• UC: Hounsfield Unit

The higher the HU, the darker it will appear on CT imaging

• True, it only gets darker the higher the HU

• False, it only gets brighter the higher the HU

• Depends, CT is more complex than CR