Jen Test 6 Word Scramble

Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

Normal Size Small Size show me how

Question	Answer
The range of exposure over which a film produces an image if the definition for?	Exposure latitude
Doubling the mAs on an inversely proportional system will result in: 1. Half the brightness level 2. Double the exposure index 3. A decrease in the exposure index	2. Double the exposure index
Which radiographic image capture method uses chemical development to produce the manifest image?	Film/screen radiography
The exposure latitude of digital projection radiography responds in a _______ manner	Linear, non-threshold
T/F: If grid lines are present and run parallel to the scanning laser, the image will not have the moire pattern present.	False
T/F: Digital systems are less sensitive to scatter radiation than film/screen systems?	False
The arrangement of pixels in rows and columns is known as?	A matrix
T/F: Aliasing occurs when the sampling frequency is not greater than twice the frequency of the input signal?	True
The active layer in a PSP plate is usually made of phosphors from what family group?	Barium fluorohalide
Which layer of the PSP plate sends light in a more forward direction when released in the reader?	Reflective
The laser excites the electrons trapped in the phosphor centers so that they energy may be released in the form of _______	Light
What device in the reader detects the light being released from the PSP plate during reading?	Photodetector
3 ways the PSP plate is erased.	1. After every PSP plate is read. 2. By flooding it with a bright light. 3. Manually by selecting the proper eraser method.
T/F: Too much mAs will cause quantum mottle	False
Exposure latitude with digital imaging is more _____ when compared with analog imaging.	Wide
In digital imaging, the term _____ replaces density as applied in analog based imaging.	Brightness
A ____ SNR is desired for best image density.	High
Another term for imaging noise is?	Mottle
T/F: The greater the exposure to the plate, the greater the intensity of the light is emitted from the plate during the reading.	True
T/F: Fifty percent of the IP must be exposed to produce a correct reading of the image.	False
The instantaneous production of light resulting from the interaction between a compound and a form of energy is known as ________	Fluorescence
Which of the following are advantages of digital systems over film-screen systems? 1. Increased dynamic range 2. Higher spatial resolution 3. More contrast resolution	1. Increased dynamic dynamic range 3. More contrast resolution
Each cell of an image matrix is called?	A pixel
What is spatial resolution in digital imaging is determined by?	Matrix size and the size of the field of view
Quantum mottle on an image is also referred to as?	Signal loss
How would dirt on the light guide of a CR reader appear on a digital image?	White lines
A quality assurance test for digital imaging receptors is to check for dark noise. What is the purpose of this test?	To assess the level of detector noise in the system.
The latent image can remain "stored" in the PSP plate for ____ hours before information is lost.	8
The active portion of a CR imaging plate is?	Barium fluorohalide phosphors
When was CR invented?	In the 1970's
When was CR introduced to the medical field?	1981
T/F: CR is the most widely used from of digital radiography.	True
What does PSP stand for?	Photostimulable phosphor
What does SPS stand for?	Storage phosphor screen
When is it called PSP and when is is called SPS?	PSP: before its exposed. SPS: after its exposed
How many layers are in the PSP plate?	5
What are the 5 layers of the PSP plate?	1. Protective layer 2. Photostimulable phosphor layer 3. Reflective layer 4. Base 5. Backing
What is the purpose of the protective layer?	To provide protection to the active layer.
Whats is the purpose of the photostimulable phosphor layer?	It is the active layer where the latent image is formed.
What is the purpose of the reflective layer?	To increase efficiency.
What is the purpose of the base layer?	To provide support.
What is the purpose of the back layer?	To absorb scatter.
What is the back layer made of?	Lead (Pb)
What 2 things are the photostimulable phosphors comprised of?	Barium fluorohalide and europium.
What are the chemical symbols for barium fluorohalide with europium?	BaFBr:Eu or BaFI:Eu
What is the role of the europium?	It acts as the activator. Plays the greatest role in the formation of the latent image. (It is similar to the sensitivity speck in the emulsion of the film)
Photostimulable phosphors emit light when they are stimulated by??	Xrays or by different light sources.
Why are phosphors linear versus "block shape"?	To enhance absorption of the xrays and limit the divergence of light emission.
What is the first step in the process of latent image formation?	Xrays interact with the outershell e- of photostimulable phosphor via compton (scatter) and photoelectric (absorption) interactions causing excitation of the outer shell e-
What is the second step in the process of latent image formation?	Outer shell e- becomes excited, leaves it orbit while simultaneously producing light.
What is the third step in the process of latent image formation?	The excited e- hovers just above its orbit causing a void and resulting in an unstable atom.
What is the fourth step in the process of latent image formation?	When the e- return to its orbit light is emitted again.
When can electrons return to their orbits?	On their own over time or when stimulated by an infrared laser.
How many electrons lose energy and drop back into their shell?	50%

Created by: Aborys88