Exam 3: Computed Radiography: Physics and Technology

Energy subtraction imaging can be done in CR using a special ____________________ to create separate images of bone and soft tissue.

The emitted light from the CR is optically filtered and collected by the light channeling guide, or light collection optics.

Error correction ensures that equipment not meeting the performance criteria or tolerance limit established for specific QC tests must be replaced or repaired to meet specifications.

Quality control involves a number of activities that are of significance to the administrator.

The smaller the ____________________ size, the better the spatial resolution of the image.

The lasers used today for PSL in CR units are ____________________ lasers that produce light with a 680 nm wavelength compared to He Ne lasers that produce light with a 633 nm wavelength used in earlier CR units.

An image with a bit depth of ____ will have 256 (28)shades of gray per pixel.

Routine performance involves conducting a QC test on the equipment on a regular basis with varying degrees of ____________________.

Which of the following is a feature in an image that masks or mimics a clinical feature?

____________________ involves both sampling the analog signal and quantization.

The maintenance of equipment is an integral part of the daily activities in _____________________ since it is considered a component of a continuous quality improvement program.

The digital detector used in CR imaging is the ____________________.

When is the PSP IP erased by exposing it to a high intensity light beam to get rid of any residual latent image?

Once the fixed stationary IP is exposed, the ____________________ image is acquired using a scanning technology appropriate to the system.

In the past, gas lasers such as a helium-neon (He-Ne)laser were used; however, current CR readers use solid-state laser diodes that emit a red laser beam having wavelengths of about 670-690 nm.

Which of the following refers to X-ray exposure of the phosphor plate storage, or imaging plate (IP)?

Given the negative feedback due to underexposures, what does a predictable and unfortunate use of higher exposures result in?

The ____________________, or scanner, is a machine for scanning the exposed IP to render the latent image visible.

A(n)____________________ indicator is a numerical parameter used to monitor the radiation exposure to the IP in CR imaging.

The number of trapped electrons is proportional to the ____.