Imaging Final Word Scramble

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Question	Answer
The purpose of the barcode label is to match the image information with the:	Imaging plate
Computers operate using a ______ language	Binary
PSP Imaging plates are erased by flooding the plate with:	Light
Iâm the technology of CR, the latent image is actually	The light from the phosphor following laser excitation of the reader assembly
A histogram displays the useful signal by locating	All pixel values
The digital detector used in CR Imaging is the	Imaging plate
Grossly overexposed digital images will demonstrate	Low contrast
The phosphor layer is made of the phosphors from the _____ family	Barium fluorohalide
The layer of the imaging plate that traps electrons during exposure is the _____ layer	Active
The active element in a storage phosphor is	Barium fluorohalide
CR acquires an image through:	The use of a storage phosphor plate
In the past, gas lasers such as a helium-neon laser were used, however, current CR readers use solid state laser diodes that emit a red laser beam having wavelengths of about 670-690nm	True
The number of trapped electrons is proportional to the	Absorbed radiation
Quantum mottle is caused by	Insufficient light
Exposure latitude is to conventional radiography as ____ is to DR	Dynamic range
An S value of 200 represents an	Exposure to the IP of 1mR
Resolution is controlled by ____ size	Pixel
When changing exposure technique from 9 mAs to 18mAs using CR, the radiographer should expect	No change
âFadingâ occurred after	8hours with 25% of image lost
CR AND DR have a broader range for exposure and wonât affect the image	True
Histograms are graphs of the number of pixels in the entire image or part of the image having the same gray levels	True
The LUT is used to distinguish all the different contrasts of an image	True
1MR=2000 Ideal EI # is 1700-2300 Increase by 300, double exposure	Exposure index
1MR= 200 Ideal is100-400 Double #, double exposure	S value
The emission of a bluish purple light is when	The transition of the electron from a higher energy state goes to a lower energy state (ground state)
When the electron is in the F Center it is at this point when the electrons are spatially distributed and create a _____ image	Latent
Have thinner layers of phosphor, provide sharper images, used when small detail is critical Slower speed= high resolution	High resolution IPS
Have a thick phosphor layer, absorbs more radiation, have faster speeds High speeds= low resolution	Standards resolution IPS
Most important layer within the imaging plate	Phosphor layer
Halide can be	Chlorine bromine or iodine
Image plate phosphor layer contains Europium within matrix but is not active	True
Luminescence	Emission of light by a substance not resulting from heat
Fluorescence	Immediate emission of light
Phosphorescence	Delayed emission of light
PSL	Photostimulated luminescence
Four primary steps in CR	Image acquisition Image plate scanning and then erasure Image processing Image display
A(n) ____ indicator is a numerical parameter used to monitor the radiation exposure to the IP in CR Imaging	Exposure
Kilovoltage peak should be chosen:	Penetration
CR systems acquire clinical info by	Laser scanning a PSP plate
Photostimulable phosphors have the property of creating and storing a _____ when exposed to X-rays	Latent image
Computed radiography is also referred to as	PSP
DICOM is a standard that allows imaging modalities and PACS to communicate the same language	True
For digital imaging systems, the spatial resolution depends on the size of the ____________________ in the matrix.	pixel
Which of the following reduces the output image from the scintillator phosphor to the size of the CCD array?	optical system
____ produce(s) lateral spreading of light, which destroys the spatial resolution of the image.	powdered phosphors
Which describes the ability of the imaging system to resolve fine details present in an object?	spatial resolution
an eight bit word is called a	byte
computers operate using a	binary machine language
which layer used in the indirect flat panel digital detector is usually either cesium iodide or gadolinium oxysulfide?	xray scintillator
DR is characterized by	the use of a reusable receptor
in digital imaging the limiting factor in spatial resolution is the	pixel size
______ is a photoconductor that conducts electrons when struck by light or X-ray photons	selenium
when matrix size is increased and pixel size goes down,	spatial resolution increases
_______ is a complex mathematical function that measures the ability of the detector to transfer its spatial resolution characteristics to the image	modulation transfer function
the window level controls	brightness
the exposure indicator number is an	indication of radiation absorbed by the imaging plate
each binary number is called a	bit
the best signal to noise ratio is	more signal then noise
while flat panel indirect detectors use a photodiode, direct detectors use	photoconductor
computerized digital images consist of a _____ of picture elements, each with a video display value or gray shade	matrix
a histogram is	a graphic representation of X-ray exposure
______ will detect the light from the cesium iodide scintillator in the indirect flat panel TFT detector	sensing area
a common feature between indirect and direct DR technology is	TFT
in all systems, exposure outside the range indicate	both over and under exposure
the purpose of a LUT is to	apple a predetermined scale of contrast to digital data sets
_______ deals with the efficiency of a detector to convert the radiation signal at its entrance window into useful image signal	DQE
with indirect flat panel TFT digital detectors, what is used to first convert X-ray photons into light photons?	scintillator layer
the window width controls	image contrast
an MTF of ___ represents a perfect transfer of spatial and contrast information	1
grossly overexposed digital images will demonstrate	a loss of contrast
if the digital FOV is 1024 and the display matrix is 256 the pixel size would be	4
which major technical component of a digital radiography system refers to the collection of X-rays transmitted through the patient	data acquisition
what does X-ray exposure of the PSP IP create	latent image
the layers of a flat panel indirect capture detector include	scintillator phosphor, photodiode, TFT array
the _____ descriptor takes into consideration not only the signal to noise ration but also the system noise, and therefore includes a measure of the amount of noise added	DQE
the window width	decreases contrast and increases grays
which image quality descriptor of a digital image is related to the size of the pixels in the image matrix	spatial resolution
given the negative feedback due to underexposures, what does a predictable and unfortunate use of higher exposures result in	dose creep
_____ is the max range of pixel value a computer, display monitor, or other digital device can store	bit depth
a digital image can be described with respect to several characteristics or fundamental parameters, including the matrix, pixels, voxels, and bit depth	true
computerized digital images consists of a ____ of picture elements, each with a video display value or gray shade	matrix
the term ____ as used in this book, refers to projection radiography, whereby computers process data collected from patients using special electronic detectors that have replaced the X-ray film cassette	digital radiography
digital images are less sensitive to scattered and background radiation	false
while standard IPS have thick phosphor layers and absorb more radiation, high resolution IPs have thinner phosphor layers and provide sharper images compared to thick phosphors	true
saturation and ALARA violations are the primary reasons to use appropriate exposure level	true
the most intense aspect of an X-ray beam is located on the cathode side	true
which of the following is a photoconductor that conducts electrons when struck by light of X-ray photons	selenium
Larger matrix= smaller pixels=improved sharpness	true
the LUT is selected by the operator when a procedure is entered at the console	true
When the quality of a digital detector is inspected for purchase, the preferred detector for purchase would have	DQE of 68% and MTF of .80
increasing the KVP increases the number of X-ray that X-ray tube emits	true
doubling your distance from the radiation source cuts your radiation exposure in half	false
the percentage of a detector elements area dedicated to photon absorption	fill factor
changes in OID can affect the exposure indicator	true
a compton scatter interaction takes place between an X-ray and an outer shell electron	true
reducing KVP using a grid and increasing collimation all reduce the production of scattered radiation	false
a digital image is composed of a series of rows and columns known as a matrix	true
CR systems acquire clinical info by	laser scanning a PSP plate
The flat-panel TFT digital detector uses complex and sophisticated electronic circuitry to read out the electrical charges produced and stored in the matrix array.	true

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