Computed Radiography - Bushong: Chapter 12

In computed radiography, what do the terms bit, byte, pixel, bit depth, and matrix refer to?

• They refer to digital image components and data representation.

• They refer to types of radiographic equipment.

• They refer to patient positioning techniques.

• They refer to chemical processing methods.

Which of the following lists and defines the components of computer hardware?

• Input devices, output devices, storage devices, and processing devices; each performs a specific function in a computer system.

• Only software applications; they are the main components of computer hardware.

• Internet connectivity and cloud storage; these are the primary hardware components.

• Printers and monitors only; they make up all computer hardware.

The development of computed radiography involved which of the following advancements?

• The introduction of photostimulable phosphor plates for image capture

• The use of traditional film and chemical processing

• The exclusive use of digital flat-panel detectors from the beginning

• The elimination of any need for image processing computers

The relevant features of a storage phosphor image receptor include:

• Ability to store and release energy upon stimulation

• Direct conversion of X-rays to electrical signals

• Use of silver halide crystals for image formation

• Immediate image display without processing

The operating characteristics of a computed radiography reader are:

• It scans photostimulable phosphor plates to produce digital images.

• It uses film to directly capture X-ray images.

• It only works with analog imaging systems.

• It does not require any electronic components.

Spatial resolution, contrast resolution, and noise are important factors related to computed radiography. Which of the following best describes their relationship?

• Higher spatial and contrast resolution with lower noise result in better image quality in computed radiography.

• Higher noise improves spatial and contrast resolution in computed radiography.

• Lower spatial resolution always leads to higher contrast resolution in computed radiography.

• Noise does not affect image quality in computed radiography.

Opportunities for patient radiation dose reduction with computed radiography include:

• Using appropriate exposure parameters

• Increasing repeat exposures

• Ignoring image quality

• Using higher radiation doses than necessary

The digital characteristics of matrix and pixels are best described as:

• Matrix refers to the arrangement of pixels, and pixels are the smallest units of a digital image.

• Matrix is a type of color, and pixels are measurement units.

• Matrix is a storage device, and pixels are data files.

• Matrix and pixels both refer to image compression techniques.

Recognize the relationship among pixel size, field of view (FOV), and matrix size.

• Pixel size = FOV / matrix size

• Pixel size = matrix size / FOV

• Pixel size = FOV × matrix size

• Pixel size = matrix size × FOV

The relationship between spatial frequency and spatial resolution is:

• Higher spatial frequency corresponds to higher spatial resolution.

• Higher spatial frequency corresponds to lower spatial resolution.

• Spatial frequency and spatial resolution are unrelated.

• Spatial resolution is always greater than spatial frequency.