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imaging

imaging Dakota

Question	Answer
The reflective layer______	Sends light in a forward direction
Thin film transistor is the electronic gate keeper used in flat panel technology?	True
The longer an image is stored in the computed radiography (CR) cassette, the:	More energy is lost.
A voxel is a representation of the image data	False
The wavelength of the CR reader laser is _________ nm	670-690
Flat-panel detectors that use indirect conversion technology convert:	X-rays to visible light
The laser scans the imaging plate in a __________pattern	Raster
The purpose of the barcode label is to identify the	imaging plate
The phosphor layer is made of phosphors from the _______family.	Barium Fluorohalide
CR acquires an image through:	the use of a storage phosphor plate
A device that acts like a switch to send electrical charges to the image processor in a direct conversion flat-panel detector is known as a ________transistor.	Thin-Film
The layer of the imaging plate that traps electrons during exposure is the ____layer	Active
Photodiode converts light energy into electrical current.	True
What color of light is emitted by a computed radiography photostimulable phosphor plate after stimulation by solid state diode laser light?	Blue
The indirect conversion system that requires optical coupling and image size reduction is known as a:	CCD
DQE	The ability of a detector element (del) to absorb x-rays or light: its sensitivity to photons.
Active Matrix Array	A panel of electronic detector elements laid out in rows and columns: used to convert incoming light or x-ray photons into an electrical signal.
CCD	A flat, compact light sensing device that uses a single layer of silicon as its sensitive surface, used for recording images.
Conductor	Material that allows the efficient transfer of heat or electricity.
Del	Acronym for "detector element" an individual hardware cell in a DR image receptor, capable of producing a single electronic readout from incoming photon (light or X-ray) energy.
Fill Factor	The percentage of a detector element's area dedicated in photon absorption.
Which of the following measures best determines the performance of a flat-panel detector?	DQE
The amount of detail present in any image is known as ________resolution.	Spatial
Which of the following is used asa photoconductor?	a-Se
The x-ray absorber typically used in direct capture DR is a:	Photoconductor
When using a photostimulable phosphor plate to capture the remnant beam, what processes the electrical signal from the photomultiplier and produces a digital image?	Analog to digital converter.
The components that focus the signal from the scintillators to the CCD are called:	Fiber optics
Each square in a matrix is called	Picture element
A turbid scintillation crystal produces:	light spread
The purpose of the barcode label is to identify the ______.	Imaging plate
Scintillators are phosphors that:	produce light when absorbing x-rays
Photoconductors are materials that:	absorb x-rays and produce electrical charges.
The type of flat-panel detector that uses thin films of silicon integrated with arrays of photodiodes is known as a(n):	amorphous silicon detector
Photo conductor material conducts electricity when illuminated by x-ray photon's.	True
Which of the following is not considered a scintillator?	a-Se
The imaging plate reader uses a laser to scan the imaging plate, releasing the energy stored in the conductive layer as ______ light.	Blue
Fluorescence	Immediate emission of light under stimulation
Laser	Light amplification by stimulated emission of radiation
Matrix	The collective rows and columns of pixels or dexels that make up the area of an image or Image receptor.
Phosphorescence	Delayed emission of light.
Similar to CR, DR can use the existing diagnostic equipment found in today's imaging departments.	False
The two elements needed to convert light signals into an electrical signal while using indirect capture DR are TFT and:	photodiodes
In reference to PSP image capture, to release the latent image, which of the following devices is scanned over the phosphor plate?	Focused laser light
CR imaging plates are erased by flooding the plate with __________.	Light
The longer an image is stored in the computed radiography (CR) cassette, the:	more energy is lost
What is selected in order for the computer processor to control image contrast?	LUT or look up table
Grossly overexposed digital images will demonstrate:	loss of contrast
In digital imaging, kVp selection has an effect on 1. Photon energy 2. Penetration 3. Image contrast	1 and 2 only
Describe Exposure Latitude	These were fill in the blank which my answer was: this is the margin of error for an image. Which for film it is -30 to +50, while dr and cr it is -50 to +400 percent error.
Describe dynamic range	These were fill in the blank which my answer was: this is what the computer has inputted to make every xray or histogram into a perfect one. This gived you the range of what pixels and how they are arranged.
Digital imaging systems cannot compensate for;	too low kVp
When a single 15% step increase in kVp is accompanied by a halving of the mAs, the absorbed dose to the patient is:	reduced
which of the following groups of technical factors will deliver the greatest patient dose?	160 mAs, 70 kVp
Quantum mottle is not a form of noise	False
The only quality not tampered with by digital processing is	Shape distortion
Radiography is the best profession ever!!!	True
The electronic term used to describe anything that interferes with visualization of the x-ray image is	Noise
Exposure factors of 2 mAs and 75 kVp were used for a particular part. Which of the following changes would result in twice the exposure to the image receptor	4 mAs
In the digital age, the main role of radiographic technique is to;	ensure that adequate signal reaches the detector
By reducing the mAs by 1/2 and increasing kVp 15% there is a reduction in ESE and absorbed dose by	1/3rd
How are mAs and patient dose related?	mAs and patient dose are directly proportional
Increasing mAs will compensate for the lack of kVp.	False
In the digital age, anatomy smaller than _____ cm should no longer be imaged using a grid.	13 cm
An increase in kilovoltage will	increase photon energy
Which of the following factors influence's the production of scatter radiation? 1. Kilovoltage level 2. Tissue density 3. Size of field	1,2 and 3
Describe subject contrast	These were fill in the blank which my answer was: this is the density of the different tissues in the body and also the amount of absorption of the different tissues in the body from the remant beam
For all digital imaging systems, a lower limit for exposure to the receptor is imposed by:	the appearance of mottle
How much over-exposure is required before a digital imaging system becomes overwhelmed with data, causing saturation to occur.	8-10 times
Misunderstanding about radiographic technique an the nature of digital imaging, combined with the extremely broad exposure latitude of digital imaging systems, has lead to what problem.?	Dose creep
Virtual grid software has been clinically demonstrated to;	all of these
In digital imaging, mAs selection has an effect on 1. receptor exposure 2. patient dose 3. brightness	1 and 2 only
An appropriate exposure range that will produce a quality image while delivering acceptable patient dose defines.	exposure latitude
S/N is the ratio of signal and noise	True
Describe what an Exposure Indicator is.	These were fill in the blank which my answer was: This is a number that will show on how much of the beam was receieved from the exposure. There is a range allowing to see if it was over exposed or underexposed with this number for the exposure.
Describe appropriate selection of exposure factors for a digital system	This was fill in the blank, which will be based on your clinic site.

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