Imaging Equipment Fall Final Part 2
2309 Rad Imaging Equpment Fall final part 2
- 1.The greatest recorded detail is seen using
- A.
Cinefluorography spot film
- B.
Video tape spot film
- C.
Radiographic spot film
- D.
Kenescopic spot film
- 2.Which system is capable of the highest resolution
- A.
Human eye
- B.
Radiographic film
- C.
Intensifying screen
- D.
Fluoroscopic screen
- 3.Digital imaging in radiography is the general term used to describe a number of techniques that can be used to enable the digital acquisition of the information contained in the radiation beam after it exits the patient. All of the following terms are used to describe these processes EXCEPT?
- A.
Direct-to-digital radiography (DDR)
- B.
Digital fluoroscopy (DF)
- C.
Computed radiography (CR)
- D.
Indirect electronic radiography (IER)
- 4.An incident x-ray photon of 37 keV strikes an electron with 40 keV binding energy. A scattered photon results with 37 keV energy. This describes:
- A.
Compton event
- B.
Brems event
- C.
Photoelectric event
- D.
Coherent event
- 5.In order to accommodate human eye integration time, each frame of a television image must be presented in less than:
- A.
1 second
- B.
1/2 second
- C.
1/10 second
- D.
1/30 second
- 6.The electronic image formed on the surface of the photocathode will be converted into____by the output phosphor of the image intensifier
- A.
Digital matrix
- B.
Visible light image
- C.
Video signal
- D.
Laser image
- 7.The most common material used in the formation of the input phosphor of a modern image intensifier is
- A.
Calcium tungstate
- B.
Cesium iodide
- C.
Barium lead sulfate
- D.
Zinc cadmium sulfide
- 8.The principle advantage of image intensified fluoroscopic technique compared to routine radiographic imaging is that it allows for:1. an increase in the degree of spatial resolution in the images2. a reduction in the amount of exposure the patient will receive 3. the ability to visualize dynamic motion of the tissue
- A.
1 only
- B.
2 only
- C.
3 only
- D.
1, 2, and 3
- 9.The reduction of brightness at the periphery of image display of an image intensified fluoroscpoe is termed:
- A.
Vignetting
- B.
Dimunition
- C.
Lateral dispersion
- D.
Modulation transfer
- 10.The usual range of milliamperage required for an image intensified fluoroscopy is about:
- A.
1-5 mA
- B.
6-10 mA
- C.
25-100 mA
- D.
100-600 mA
- 11.The visible light image that impinges upon the target of a television camera tube is converted into a(an)
- A.
Latent image
- B.
X-ray image
- C.
Audible signla
- D.
Electronic image
- 12.The main advantage of a charged-soupled device (CCD) compared to a television camera tube include all the following EXCEPT:
- A.
It has greater sensitivity at lower light levels
- B.
It is generally much smaller
- C.
It is less sensitive to mechanical stresses
- D.
It is associated with a reduced contrast resolution or low contrast detectability
- 13.The two principle advantages that digital fluoroscopy (DF) has over image intensified fluoroscopy (IIF) are:
- A.
A lower contrast detectability and a reduced noise level
- B.
A higher speed of spot image acquisition and the ability to post process the image
- C.
An improved ability to eliminate patient motion and reduce patient exposures
- D.
Images with long scale contrast and higher spatial resolution
- 14.When a thin layer of amorphous selenium is struck by an x-ray photon in a direct-to-digital radiographic (DDR) imaging systm, the net result is:
- A.
A pair of negatively charged particles that are detected by a charged plate
- B.
An electron-hole pair that is detected by an array of thin-film transistors (TFT's)
- C.
A number of low energy secondary photons that are "burned" onto a laser medium
- D.
Visible light that is produced in the phosphor layer
- 15.With either an amorphous selenium or cesium iodide amorphous silicon digital radiographic imaging, the latent image is formed by an electronic signal that is stored by
- A.
An array of thin-film transtors (TFT's)
- B.
An array of photodiodes
- C.
A vidicon television camera tube
- D.
A series of quantum detectors
- 16.Which of the following layers are found on the input side of an image intensifier tube?1. incandescent screen 2. fluoroscent screen 3. photocathode
- A.
1 and 2
- B.
1 and 3
- C.
2 and 3
- D.
1, 2, and 3
- 17.The major factors effecting the amount of brightness gain in an image intensifier are:
- A.
Minification ratio and flux gains
- B.
Adaptation and vignestting gains
- C.
Focal and scoptic vision gains
- D.
Dispersion and retinal gains
- 18.The time it takes for the human eye to adjust to adjust to the low light levels of conventional fluoroscopy is called:
- A.
Flicker timer
- B.
Integration time
- C.
Adaption time
- D.
Interlace time
- 19.Most modern image intensifiers utilize an input fluorescent screen layer which is composed of
- A.
Calcium tungstate
- B.
Cesium iodide
- C.
Barium lead sulfate
- D.
Zinc cadmium sulfied
- 20.A substantial increase in conventional fluoroscopic brightness levels is accomplished in most modern systems using a(an)
- A.
Television system
- B.
Image intensifier
- C.
Video tape unit
- D.
Magnification technique
- 21.An electronic signal that carries the information generated in the television camera to teh cathode-ray tube (TV monitor) is termed the
- A.
Analog signal
- B.
Synchronization pulse
- C.
Video signal
- D.
Procession signal
- 22.During televised image intensified fluoroscopy, permanent static images or spot films can be produced and recorded using:1. photo-spot imaging 2. cassette-loaded spot imaging 3. video tape recordings
- A.
1 only
- B.
2 only
- C.
3 only
- D.
1, 2, and 3
- 23.In order to maintain image clarity, the path of electron flow from photocathode to output phosphor in the image intensification tube is controlled by:
- A.
The accelerating anode
- B.
Electrostatic lenses
- C.
The vacuum glass envelope
- D.
The input phosphor
- 24.The part of the image intensifier tube that functions to change the visible light image into an electronic image is the
- A.
Input phosphor
- B.
Photocathode
- C.
Focusing lens
- D.
Output phosphor
- 25.Theoperating potential in most modern image intensifier tubes is approximately
- A.
2 kv
- B.
25 kv
- C.
75 kv
- D.
150 kv
- E.
225 kv
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