RAD 122 Mid-Term Review

In which decade was MRI first introduced?

Detector performance is measured with all of the following except

The x-ray absorber typically used in direct capture DR is a:

Flat-panel detectors that use indirect conversion technology convert:

Critical characteristics of a digital image include all of the following except:

Offset correction is used to remove inherent signal that remains in a detector.

Coherent light is formed by the laser because the photons:

Automatic rescaling means that images are produced, regardless of the amount of exposure, with:

Light exposing the film is in direct proportion to the amount and energy of the incident photon upon the screen.

The ability to send images to local network stations can be accomplished using the:

The higher the number of pixels in a matrix, the:

Manufacturers make efforts to maintain a standard of less than ________ defective pixels.

A detector in which each pixel has its own amplifier is known as a:

Clinical applications for CCDs include all of the following except:

Many PACS reading stations also have image-processing capabilities.

The reflection of ambient light can be problematic with monochromatic monitors.

Early reconstruction of raw CT data took a few ______ to form a recognizable image.

Similar to CR, DR can use the existing diagnostic equipment found in today's imaging departments.

A common feature between indirect and direct DR technology is

Possible causes of image lag include all but:

Failure of the reader to find the collimation edges of an image:

Deviation index is the difference between _____ and _____ expressed in logarithmic fashion.

Multiple numeric values divided into an array of small elements capable of being processed is the definition of _____

Grid ratio describes the:

If the entire range of exposure were digitized, pixel values representing ______ would be digitized.

All of the following are components of a PACS except:

The laser scans the imaging plate in a ______ pattern

The number of bits per pixel is known as bit:

The process of scanning the moving imaging plate is known as:

DICOM is a standard that allows imaging modalities and PACS to communicate in the same language.

Indirect capture DR converts absorbed x-ray energy into visible light.

Focal spot and OID affect image sharpness _____ imaging

Air kerma is the measurement of radiation energy absorbed in a unit of air.

Kilovoltage peak (kVp) should be chosen:

Who was the first to incorporate digital imaging with the CT scanner?

A Gd2O2S scintillator is known as what type of phosphor?

CR acquires an image through:

The ______ converts x-ray energy directly to a digital electrical signal.

Raw data used to form the image histogram are compared with:

The 2-D array determines whether the imager is direct conversion or indirect conversion.

A histogram displays the useful signal by locating:

Which of the following is not considered a scintillator?

It is possible to achieve an MTF of 100%.

The layer of the imaging plate that traps electrons during exposure is the ______ layer.

A look-up table is not used as a reference to:

CsI detectors use:

Image level parameters control image:

Defective pixels can result from all of the following except

Which of the following should be considered when selecting the PSP cassette?

Shuttering is a postexposure image manipulation technique that:

The invention of CT is heralded as:

A system's ability to respond to varying levels of exposure, resulting in more detail, is referred to as:

High-pass filtering is useful for enhancing:

An image manipulation process that fills in the background so that it is darkened is known as:

Demagnification is:

Photoconductors are materials that:

The range of exposure values the image detector is able to produce is known as:

Collimation to a smaller area:

Exposure latitude is to conventional radiography as _______ is to DR.

When insufficient light is produced by the imaging plate phosphor, the image will:

All flat-panel detector systems have the ability to take images faster than the detector can accommodate.

A look-up table maps:

The continuous and varying levels of brightness and colors describes _____ images.

Excessive light entering the eye when viewing an image is known as ______ glare.

The selection of the incorrect body part from the examination menu may result in:

Using an FOV that is much larger than the part being examined will:

Amplification of the frequencies of the areas of interest is known as:

A highly efficient indirect conversion system that takes up less fill space than CCDs is known as a(n):

Which of the following statements is not true?

Teleradiography incorporated ______ to produce radiographic images.

The area of a DR detector DEL that is insensitive to x-ray exposure

The ability of a digital system to display subtle changes in shades of gray is called:

Each square in a matrix is called a:

The optical mirror in the reader:

Indirect DR uses ________ as the photoconductor material

Indirect conversion in flat-panel detectors is a ____-step process.

The number of grid lines per centimeter or lines per inch describes grid:

In PSP image capture, to release the latent image, which of the following devices is scanned over the phosphor plate?

The type of flat-panel detector that uses thin films of silicon integrated with arrays of photodiodes is known as a(n):

Which one of the following serves to protect against static build-up, dust collection, and mechanical damage to the IR

How dark or light a digital image appears on a display monitor is known as:

A wraparound image or image aliasing occurs when:

The reflective layer:

The first full-scale PACS was installed in 1993 in:

The absorption material can be attached to the pixel array electrically or physically.

The active element in a storage phosphor is:

Averaging the frequency of each pixel with surrounding pixel values to remove high-frequency noise is called:

A perfect image processing system would have an MTF of:

Which of the following is used as a photoconductor?

If all of the shades were left in an image after processing, the contrast would be:

The measurement for radiation that was incident on the image receptor for a particular exposure is known as:

An archive query retrieves images from the PACS based on any of the following except:

The higher the kilovoltage peak, the:

A device that acts like a camera in an indirect conversion detector is known as a:

Quantum mottle is caused by:

Amplifiers perform all of the following functions except:

"The sum of the components in a recording system cannot be greater than the system as a whole" is a definition of:

Which of the following can be done to decrease the chance of having image lag occur in the next image?

The amount of detail present in any image is known as ______ resolution.

The wavelength of the PSP reader laser is ______ nm.