Radiography

Question 1

Heel effect is caused by the __?

Answer 1

Anode Angle

Question 2

X-rays (bremsstrahlung) are produced under the surface of the ____.

Answer 2

Anode Disc

Question 3

X-ray photons on the anode side of the beam have a ___ path to the surface of the anode than photons on the cathode side of the beam and thus the beam will be more attenuated and less intense on the anode side of the beam.

Answer 3

Longer path

Question 4

In chest radiography anode angle left to right will make lungs ___.

Answer 4

Hyperlucent, Soft tissues more radiopaque

Should be placed in craniocaudal dimension

Question 5

Heel effect increases with ___

Answer 5

shorter SID, smaller anode angles and larger FOVs

Not the anode disc rotation speed

Question 6

Delayed radiation myelopathy typically has a time course of _____.

Answer 6

6-24 months

Question 7

The term “filtered” in filtered back projection does what to an image

Answer 7

Sharpens

Standard back projection to blurry for clinical use. Needed to filter for sharpness. Kernels.

Question 8

Detector contrast describes how a detector responds to incident x-rays. It is usually shown as a graph of the log input signal vs. signal levels on detector (characteristic curve). While film-screen systems have a non-linear response with a toe and a shoulder, digital detectors have a ______ response. While detector contrast has an important influence on how subject contrast translates into displayed image contrast, it only looks at the detector component.

Answer 8

Linear