digital imaging processing refers to
computer manipulations applied to digital images
A combination of rows and columns (array) of pixels is called a:
matrix
the size of a pixel is measured in
microns
the number of bits that determines the amount of precision in digitizing the analog signal and the number of gray shades that can be displayed in the image is the:
bit depth
The pixel bit depth determines the image's:
contrast resolution
the number of pixels per unit area is called the
pixel density
The pixel spacing or distance measured from the center of a pixel to an adjacent pixel is called the:
pixel pitch
The measure of the imaging system's ability to display the contrast of anatomic objects varying in size is the:
modulation transfer function
the _____ collects, amplifies, and converts visible light to an electrical signal
PMT
In the CR reader unit, the IP is scanned with a(n):
helium- neon laser beam
How often the analog signal is digitized is the:
sampling frequency
the distance between the analog point being sampled is the
sampling pitch
_______ can be removed from the bucky and is used on the tabletop or a stretcher
flat panel detector
DR imaging systems briefly store the electrical charge in the:
TFT
The ability of the detector to accurately capture the variety of photon intensities in the remnant radiation is:
dynamic range
the measurement of the efficiency of an image receptor in converting the x-ray exposure it receives to a quality radiographic image is the
detective quantum efficiency
a method of describing the strength of the radiation exposure compared with the amount of noise apparent in the digital image is the
signal to noise ratio
a method of describing the contrast resolution compared with the amount of noise apparent in a digital image is the:
contrast to noise ratio
which of the following is not accomplished through the histogram analysis
manipulation of image contrast
the histogram analysis represents the _______ for different exposure levels
incidence of pixels
the range of the histogram data set that should be included in the displayed image is determined by the
VOIs
the numerical value indicating the level of radiation exposure to the digital IR is the
exposure indicator
a value that reflects the difference between the desired or target exposure to the IR and the actual exposure to the IR is the:
deviation index (DI)
the _____ provides a method of altering the image to change the display of the digital image
lookup table
An example of a scintillator used in an indirect conversion detector is:
a. cesium iodide
b. gadolinium oxysulfide
c. amorphous selenium
a and c
the indirect conversion detector uses
Scintillator and photodetector
the computer system designed to distribute, store, and display digital images is
PACS
diagnostic interpretation should be done at a high-resolution ______ display monitor
5 megapixel
the communication standard for information sharing between PACS and imaging modalities is the
DICOM