Digital

•Following the laser stimulation of the photostimulable phosphor, the excited electrons are _____.

•The decreasing luminous intensity with increasing distance from the source of light follows _____.

•Image detail is also called _____.

•Radiation fatigue occurs in _____.

•As mAs is increased the signal to noise ratio is _____.

•Reregistering an image to correct for patient motion is done with _____.

•Artifacts are an acceptable part of digital imaging.

The use of an IR with _DQE can result in _pt doses.I. low, lowerII. high, lowerIII. high, higherIV. low,

•If there were such thing as a perfect imaging system, the MTF would be equal to _____.

Digital radiography was first introduced by _____.

•The computed radiography image has _____.

_____ is prevented by flooding the erased imaging plate with bright light.

•Medical flat panel display devices are identified by the _____.

•If a digital radiography imaging system has a spatial resolution of 10 lp/mm, what is the pixel size of that system?

•The primary limitation of fanned beam radiography is _____.

•_____ is done during preprocessing to correct for an irregular pattern over the image.

•With digital imaging, patient dose can be reduced by using higher _____ techniques.

•Which modality produces the largest image files?

•The two principal characteristics of a medical image are _____.

•In scanned beam radiography, the spatial resolution is determined by the _____.

•As spatial frequency increases the object size _____ and the spatial resolution _____.

•The digital imaging plate can sit for long periods of time after the erase cycle.

•What is the basic photometric unit?

•If an image receptor has a high probability of interacting with the x-ray beam, then it has a high _____.

•The three classifications of digital imaging artifacts are _____.

•The use of two screens in imaging results in a higher _____.

•The laser beam must be less than 100 nm in diameter in order to maintain _____.

•The human visual system can distinguish _____ shades of gray.

Which is/are done to the image during preprocessing?•I. Lossless compression•II. Partitioning•III. Flatfielding

•The national standard for image transmission in teleradiology is the _____ format.

•Scanned projection radiography differs from conventional radiography in the lack of _____.

Europium is the _____ of the photostimulable phosphor.

•The number of gray shades that an imaging system can reproduce is called its _____.

•Digital radiography images should be repeated if there is a problem with _____.

•The portion of useful image-forming x-rays is referred to as the _____.

Almost all medical flat panel digital display devices are _____.

•Conventional x-ray tubes and cassettes are used with _____ radiography systems.

•Within a PACS network the secretarial workstation and the viewing workstation would both be called _____.

•DQE is _____.

•Spatial frequency is used to describe the quality of spatial resolution in terms of _____.

•Spatial resolution is determined by the ratio of _____ to _____.

•What is the file size of an image with a 1026 x 1026 matrix and a 2.5 byte gray scale depth?

•Screen-film radiography has a dynamic range of _____.

•Recent studies have shown that denser breast tissue is best imaged with _____.

•Preprocessing the digital image is done _____, and post-processing is done _____.

•PACS stands for _____.

•In digital radiography, the brightness of the image is determined by _____.

•The four steps of creating an image with computed radiography are _____.

•The dynamic range determines the degree of _____ in the image.

•The output signal from the photostimulable phosphor plate is converted from analog to digital by the _____.

•If a digital system has a spatial resolution of 4 lp/mm, it can resolve an object as small as _____ mm.

•The _____ digital imaging system uses the highest dynamic range.

•What is the most recent development in digital radiography image receptors?

•Of all radiographic imaging systems, _____ has the best contrast resolution.

•Optical filters are used to filter out the _____ light and allow the _____ light to reach the photodetector.

•Image file size is determined by _____ size and gray scale.

•Digital imaging could only be developed after advances were made in _____.

•In digital radiography, spatial resolution is improved with increased _____.

•The ambient light at a digital image workstation should be _____.

A photostimulable phosphor in a metastable state will emit light_I-immediately II-when stimulated by light III-over time

•Computed radiography and screen-film imaging both have a(n) _____.

•The computed radiography cassette is called a(n) _____ plate.

•Computed radiography cassettes and film/screen cassettes can be used interchangeably with any x-ray imaging system.

•During preprocessing the digital output of the image receptor may need to be manipulated to correct for _____.

•In digital imaging, spatial resolution is ultimately limited by _____.

•When switching from screen-film imaging to computed radiography, which step is eliminated?

The computed radiography reader is made up of _, _, and _ modules.I. mechanical II. chemical III. optical IV. computer

•With computed radiography the contrast is _____.

•The principal source of noise in computed radiography is _____.

•The science of _____ is the study of the response of the human eye to light.

•The laser is one of the _____ features of the computed radiography reader.

Spatial resolution, contrast resolution,noise & artifacts are identical in screen-film imaging and computed radiography.

•Computed radiography cassettes can sit for _____ between exposures.

•In digital radiography, the latent image is formed on the _____.

•Compared to CRTs, AMLCDs have _____.

•Digital radiography first began to be used in clinical settings in the _____.

•The software correction that equalizes the response of each pixel to a uniform exposure of x-rays is called _____.

•Which is not a part of PACS?

•Text data and email are generated at a _____ workstation in PACS.

Computed radiography developed in the 1970s with the use of _____ as the image receptor

•Computed radiography uses (a) _____ for latent image formation.

•Post-processing includes all of the following except _____.

•In digital fluoroscopy, each matrix pixel represents _____.

The photostimulable phosphor screen is handled in a _____.

•A _____ test tool is used to acquire data for an MTF curve.

•A digital display monitor is best viewed _____.

•Computed radiography imaging produces _____ gray levels.

•_____ is corrected by the application of an offset voltage.

•Switching from screen-film imaging to computed radiography can _____ patient dose.

•Cassettes used in CR are more highly sensitive to background and scatter radiation than film/screen cassettes are.

•The bit capacity of each pixel identifies the _____ of a digital imaging system.

Computed radiography screens respond to radiation with _____.

•A ghost image can occur in digital imaging because of _____.

A computation of the mean pixel value within a region-of-interest is performed for _____.

•Digital imaging techniques are always applied to _____.

•A liquid crystal is a material in a _____ state.

•Scanned projection radiography was developed as a complement to _____.

•Flatfielding is accomplished through automatic calibration images called _____ and _____.

•Almost all digital images in medical imaging are viewed and interpreted on a _____.

•What size is the average CR or DR image file?