Exam 4: Effective Use of Computed Radiography

Because of the light spread between the plate and the light guide, the spatial resolution is less than the ____________________ frequency.

What does it mean when the photon intensity reaching the receptor is lower than that required to produce an optimal image?

_____________________ means that the photon intensity reaching the receptor is higher than that required to produce an optimal image.

Because automatic rescaling produces images with similar brightness, it is viewed as the ____ of the system.

Which of the following is expressed as pixels/mm, also referred to as pixel density?

If larger body structures are done 3 on 1, the ____________________ scatter will reduce the contrast unless the unexposed areas are shielded between exposures.

Since the image contrast is generally determined more by the processing algorithm, the ____________________ does not have the impact on final image contrast as with screen/film systems.

With digital systems, what determines the speed class at which the system is operated?

Because of the increased sensitivity to scattered radiation, the kVp should not exceed ____ for any nongrid radiography, including chest.

With cassette-based PSP systems (CR), ____________________ resolution becomes a bit more complicated.

Except for special extremity plates from ____, all plates are basically made from the same barium fluorohalides and are coated to the same thickness.

The exposure latitude of a digital detector is substantially lower than screen-film.

If the image is overexposed by more than 2X to 3X, a portion of the image may be saturated.

With digital imaging, automatic rescaling of the image provides images that have similar brightness (density) over an exposure range greater than ____X.

The factors determining ____________________ included motion factors, geometric factors, and the spatial resolution of the receptor unit (line pair/mm).

The CR cassettes, or imaging plates (IP), are employed in the same manner as screen/film cassettes in existing radiographic units designed to accommodate software.

Saturation and ALARA violations are the primary reasons to use appropriate exposure level.

What results in flattening of the luminance from the plate and loss of contrast?

Because of the wide dynamic range of the PSP plate and automatic rescaling, the relationship between exposure and image brightness is ____________________.

Digital image acquisition decouples the relationships between exposure and image appearance via automatic rescaling and image processing algorithms.