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Physics HW U4

QuestionAnswer
In a modern fluoroscope, the fluoroscopic x-ray tube: can be under or over the table
The fluoroscope was invented by: Thomas Edison
Compared with a radiographic examination, the primary purpose of the fluoroscopic examination is to visualize: Dynamic images
Fluoroscopy normally requires a tube current of: 1 to 5 mA
Compared with a radiography, the x-ray technique required for fluoroscopy calls for which of the following? lower mA
Automatic brightness stablization(ABS) is designed to compensate for changes in which of the following? Patient composition and Patient positioning
The Bucky slot cover of a fluoroscope is a: Protective device
Which of the following structures is the most sensitive to color? Cones
What is the function of the iris? Control the light level
The cones are: Very sensitive to light
The fovea centralis is: Part of the retina
Visual acuity is the ability to do which of the following? Perceive fine detail
The rods are used principally for which of the following? Dim vision
In general, during fluoroscopy as compared with radiography: the mA is lower
Which of the following describes the fluoroscopic systm designed to maintain constant image intensity? Automatic brightness stablization(ABS)
Which of the following structures is responsible for the vision of dim objects? Rod
Which of the following ocular structures immediately precedes the vitreous humor along the path of incident light? Lens
Which of the following properties is associated with rods but not with cone? scotopic vision
Phototelectric emission: Is the emission of electrons from an illuminated surface
At what stage of image-intensified fluoroscopy is the number of image-forming photons lowest? entering the input phospher
image-intensifer brightness gain increases with increasing: flux gain
When an image intensifer recieves x-rays at the input phospher, what is emitted at the output phospher? Visible light
which of the following is the input phospher of image intensifers? Cesium iodide
Which of the following is the output phospher of image intensifers? Zinc cadmium sulfide
The photocathode converts: Visible light into electrons
Which of the folowing is the component of the image intensifer responsible for focusing the electron beam? Electrostatic lens
The ability of an image intensifer to enhance image illumination called Brightness gain
The minification gain of an image intensifer increases with increasing: input phospher size
Which of the following is a representive brightness gain for an image intensifer? 200
If an image intensifer is described as a 25/12 tube , 25/12 refers to which of the following? diameter of the input phospher in cm
An image that displays vigentting: is deam around the periphery
With multifocus image intensifer in magnification mode: Spatial resolution is improved
In a 10/7/5 image intensifier: the field of view is largest in the 10 mode
Place the following in proper sequence for image intensified fluoroscopy:1. electric signal to light 2. electrons to light 3. light to electric signal 4. light to electrons 5. x-ray to light 5,4,2,3,1
Which of the following applies to the output of phospher? light emitted
Vertical television resolution is limited principally by which of the following? lines per frame
The electron beam in a television camera tube is produced by which of the following means? Thermionic emission
What is the cinefluorography component of image intensifer fluoroscopy? Synchronized
What is the photoemissive component of image intensified fluoroscopy? electrons from light
Which of the following is photoconductive? Target
What is the principle disadvantage of coupling the television camera to the image intensifier with the use of fiber optics? photospot camera cannot be used
Which of the following refers to the image intensifier input phospher? cesium iodide
Which is a critical component in optically coupling an image intensifer with a photospot camera? objective lens
What is the most important component of a television monitor? cathode ray tube
In an optical coupling arrangement, which is nearest the television camera? camera lens
What is the component of the television monitor in which the video signal is transformed into an image? phospher screens
What is the electron beam of the television camera tube? collimated
One television frame is equivalent to which of the following? two television fields
Fluoroscopic television operates at a frame rate of 30/fs
Horizontal television resolution is limited principally by which of the following? bandpass
what is normally the weakest imaging link in television fluoroscopy? television monitor
Common frame rates during cinefluorography are 15, 30, and 60 fs because Of thefrequency of the of power supply
When the electron beam of the CRT is blanked, it is? in a vertical retrace
Which of the following is true about cineradiography? The x-ray beam is off when the shutter is closed, as a patient protection measure
What is the television camera tube components of image intensified fluoroscopy? Vidicon
Created by: atesta0824