Key Questions - Imaging Techniques

List five ways of reducing primary radiation.
For CT, what is meant by the window?
On T1-weighted imaging, which tissues are low-signal (i.e., dark)
List five ways of reducing secondary radiation.
For CT, what is meant by the level?
On T2-weighted imaging, which tissues are high signal (i.e., bright?
How does the amount of radiation change as you move away from the x-ray source?
What is the rationale for DEXA study?
How are MRAs and MRVs created?
Do multiple short exposures have the same effect as a single dose over the same total exposure time?
What is the principle behind MRI?
What is the primary difference between ultrasound imaging and other imaging?
What factors should one consider concerning the risk to the fetus from a CT of the maternal chest or abdomen?
What happens to the signal intensity when the TR is increased?
What is attenuation?
How is the in-plane pixel size (d) related to the FOV and the digital matrix size (N)?
What happens to the signal intensity when the TE is increased?
Define anechoic
For a given tube voltage and current, name five factors that affect the patient's dose in radiography.
How is signal intensity related to TR and TE in a spin-echo sequence?
What is the optimal Doppler angle?
Which organ is the most radiosensitive?
Holding all else fixed, how will increased patient thickness affect the number of x-rays detected by the receptor in radiography?
On T1-weighted imaging, which tissues are high signal (i.e., bright)
What is aliasing?