During radiographic imaging, the radiation exiting the patient is composed of a range of intensities that reflect the ________ characteristic of the anatomic tissues.

receives the exit radiation and creates the latent or invisible image.

Two types of digital IRs typically used in radiography CD

Once the latent image is acquired and the raw data are digitized, image processing and display are essentially not the same, regardless of the type of IR. True or False

CR IRs can be ____ or ____ in a table or upright x ray unit.

The Computed Radiography IR includes a cassette that houses the?

The radiation exiting the patients interacts with the IP, where the photon intensities are absorbed by the ______

Although some of the absorbed energy is released as _________, a sufficient amount of energy is stored in the phosphor to produce a latent image.

emission of light when stimulated by radiation

3 Parts of Imaging Plate (SPP)

PHOSPHOR is composed of _________ doped with ________, referred to as the _________ (PSP).

This type of phosphor emits visible light when stimulated by a high-intensity laser beam, a term/phenomenon called

Two step process for image acquisition in CR Imaging

The latent image is formed in the PSP when the exit x-ray intensities are absorbed by the phosphor & the europium atoms become ionized by the _________ effect

During CR Image Acquisition, the _______ excites the electrons, and they are elevated to a higher energy state where they become stored or trapped.

The number and the distribution of the trapped electrons are _______ to the tissues differential x ray absorption and form the latent

During CR Image Acquisition, The trapped electrons remain in this higher energy state until released during the laser beam scanning of the ______.

The _________ (released energy) are extracted from the digital receptor, converted to digital data, and computer processed for image display.

- should be processed within a relatively short amount of time (WITHIN 1 HOUR) because the latent image dissipates overtime

The CR latent image is acquired in the what layer of the IP?

Most energy from the exit radiation intensities is stored in the ____ for extraction in the reader unit.

5 Layers of CR Cassette PPRBB

- the balance of light and dark shades in a displayed image. - refers to the overall lightness or darkness of an image

- what is also called density/intensity settings produce bright images - what produce dark images.

- determines how many gray levels are displayed - determines the intensity.

The ______ of the pixels in the display monitor determines the brightness of the digital image

- uses similar equipment to conventional except that films are replaced by imaging plates. - can be seen as halfway between film based conventional technology and current direct digital radiography

relative difference of intensities in two adjacent regions of an image

When referring to Computed Tomography, contrast is defined as a difference in what units?

Differences in tissue density, thickness and changes of x-ray spectrum have consequences for the what ?

Optimized tube current, collimation, pitch and image reconstruction improves the what?

produced by increased slice thickness, smaller matrix, large field of view, which results in large voxel size; high mAs to reduce noise; low pass filter

have a self-scanning readout mechanism that employs an array of x-ray detectors that receive the exit and convert the varying x ray intensities into proportional electronic signals for digitization.

- combines image capture and image readout. - available almost instantly after exposure

are more fragile and much more expensive than CR IRs.

solid-state IRs employing a large area active matrix array of electronic components ranging in size from 43x 35 cm to 43x 43 cm ( 17x14 inches to 17x17 inches).

constructed with layers in order to receive the x ray photons and convert them to electrical charge for storage and readout