Exam 13: Special Considerations on Safety in Computed Tomography and Mammography

With higher radiation exposure to the patient during a computed tomography examination,there is

Which of the following terms are synonymous in relation to computed tomography? 1)Diagonal 2)Helical 3)Spiral

In computed tomography the dose at the edge of a beam does not decrease to _________ immediately.

In spiral image acquisition,the patient table moves during the acquisition so that a

In CT because of higher effective energy of the x-ray beam,both ____________ and _______________ interactions contribute substantially to the image.

Which of the following terms are synonymous? 1)Automatic exposure control 2)Iterative reconstruction 3)Tube current modulation

In mammography maintaining and enhancing subject contrast is

For mammography molybdenum filters allow a (an)_________________ than rhodium filters.

Lower tube current is used in anatomic regions where there is ____________ attenuation because the anatomy is ____________ or _________ dense.

Filtering refers to changing the projection data before doing the back projections to remove the

Tube current modulation in CT scanning can

Which of the following is not typically used during a CT scan? 1)A tightly collimated x-ray beam 2)Direct patient shielding 3)Filtered back projection

Verifying that the center of the patient coincides with the center of the CT gantry is a significant part of dose reduction strategies that is under the control of the

DLP represents the product of the CTDIVOL and the irradiated scan length.In what unit of measure is it usually expressed?

Which of the following groups advocate annual mammography screening or mammography screening at least every other year? 1)American College of Radiology 2)American Cancer Society 3)American Medical Association

______________ is the relationship between the movement or advancement of the patient couch and the x-ray beam collimator dimension.

In CT when a series of adjacent slices is obtained,some radiation will also scatter from the slice being made into the adjacent slices.What is this radiation called?

The entrance exposure from a CT examination may be compared with the entrance exposure received during which of the following procedures?

A miscentering of ________ can produce as much as __________% increase in patient dose.

For routine head and body computed tomography examinations,effective doses fall into which of the following effective dose ranges?