Exam 4: Effective Use of Computed Radiography

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

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

Currently, each major vendor uses a unique ____________________ indicator whose values indicate the exposure delivered to the plate.

When performing a mobile chest scan, how is the cassette normally oriented?

If the exposure is >100% above the optimal signal level, the ALARA principle is violated, and the extra scatter generated will degrade the ____________________.

Overexposure implies dark images and underexposure implies light images.

If the receptor is overexposed by a factor of ____, one would assume that the patient received an equally high exposure.

With CR, grid cutoff does not result in a light image, due to the automatic ____________________ of the image.

What would substantial (>2x)overexposure of a body part generate in proportion to the overexposure?

____ are much more susceptible to fogging than are conventional film-screen systems.

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

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.

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

If the exposure field is not recognized, the off-focus radiation and scatter outside the exposure field become part of the ____________________.

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

With screen/film imaging, the ____________________ of the effect of technical factors is normally based on the image appearance rather that on the physics behind the appearance.

Since the grid strips are oriented in the direction of grid tilt, grid cutoff is more likely to occur.

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

The optimal alignment is field-centered to the ____________________ with four collimation margins parallel to the cassette edges.