Exam 9: X-ray Interaction with Matter

At energies below 40 keV, the predominant x-ray interaction in soft tissue and bone is ______________.

When the mass density of the absorber is __________, it results in __________ Compton scatter.

Compton scatter is directed at _____ angle from the incident beam.

If 5% of an incident beam is transmitted through a body part, then 95% of that beam was ______________.

Because of differential absorption, about _____% of the incident beam from the x-ray tube contributes to the finished image.

Barium is a good contrast agent because of its __________________.

A negative contrast agent is _________.

Compton interactions, photoelectric absorption, and transmitted x-rays all contribute to _________________.

K-shell binding energy increases with increasing ____________.

The scattered x-ray from a Compton interaction usually retains _____ of the energy of the incident photon.

High kVp techniques reduce ____________.

As kVp ___________, the probability of photoelectric absorption ______________.

Differential absorption is dependent on (the) ________________.

Differential absorption in diagnostic imaging is primarily caused by ____________.

In ________________, there is complete absorption of the incident x-ray photon.

Attenuation is caused by ______________.

The use of contrast agents increases the amount of ________________.

Which x-ray interaction involves the ejection of the K-shell electron?

___________ occurs only at the very high energies used in radiation therapy and in nuclear medicine P.E.T. imaging.

X-rays transmitted without interaction contribute to ___________________.