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| what happens to the electrons in a vidacon when approaching the anode |
they are decelerated to a near standstill to scan the image perpendicular to the target |
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usnavalmd Mon, 23 Feb 2009 01:32:45 GMT |
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| to attract the electron beam from the electron gun the anode has a positive potential of how many volts |
250 V |
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usnavalmd Mon, 23 Feb 2009 01:32:45 GMT |
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| in a vidacon where is the cathode located |
directly opposite of the target assembly |
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usnavalmd Mon, 23 Feb 2009 01:32:45 GMT |
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| what is functionally the most important element in the camera of the fluoro machine |
target assembly |
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usnavalmd Mon, 23 Feb 2009 01:32:44 GMT |
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| what are the three layers of the target assembly |
glass envelope
signal plate
target assembly |
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usnavalmd Mon, 23 Feb 2009 01:26:20 GMT |
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| what is it called when optical lenses and mirrors are used to magnify the image from the output phosphor onto a viewing glass |
mirror optics system |
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usnavalmd Mon, 23 Feb 2009 01:26:20 GMT |
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| what is the product of the minification gain and the ratio of the number of light photons at the output phosphor to the input phosphor |
brightness gain |
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usnavalmd Mon, 23 Feb 2009 01:26:20 GMT |
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| what is the positive potential of the accelerating anode |
25kVp |
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usnavalmd Mon, 23 Feb 2009 01:26:19 GMT |
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| what is located in the small neck of the image intensifier |
accelerating anode |
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usnavalmd Mon, 23 Feb 2009 01:20:21 GMT |
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| what maintains a precise electron path from the photocathode to the output phosphor |
electrostatic focusing cell |
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usnavalmd Mon, 23 Feb 2009 01:20:21 GMT |
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| what is it called when cesium iodide and anitomy compound respond to stimulation by light with the emission of electrons |
photoemission |
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usnavalmd Mon, 23 Feb 2009 01:20:21 GMT |
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| what is a thin metal layer that is usually composed of cesium iodide and anitomy compound |
photocathode |
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usnavalmd Mon, 23 Feb 2009 01:20:21 GMT |
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| what separates the input phosphor from the photocathode |
thin transparent layer |
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usnavalmd Mon, 23 Feb 2009 01:13:58 GMT |
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| what is curved to the shape of the glass envelope |
input phosphor |
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usnavalmd Mon, 23 Feb 2009 01:13:58 GMT |
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| what converts an xray image into a visible light image and intensifies brightness of that image |
image intensifier |
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usnavalmd Mon, 23 Feb 2009 01:13:58 GMT |
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| what is it called when visible light is emitted only during the stimulation of the phosphor |
fluorescence |
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usnavalmd Mon, 23 Feb 2009 01:13:58 GMT |
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| what is visible light that continues to be emitted after the outside stimulus has been shut off |
phosphorescence |
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usnavalmd Mon, 23 Feb 2009 01:09:40 GMT |
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| what is the light emitted by a luminescent material in response to outside stimulation |
luminescence |
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usnavalmd Mon, 23 Feb 2009 01:09:40 GMT |
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| what is it called when the light from the phosphor should be of the same wavelength or color to match the sensitivity of the xray film |
spectral matching |
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usnavalmd Mon, 23 Feb 2009 01:09:40 GMT |
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| what is it called when phosphor emits a large amount of light per xray interaction |
xray conversion factor |
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usnavalmd Mon, 23 Feb 2009 01:09:40 GMT |
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| what is the aluminum cup located on the bottom side of the I/I tube and is utilized for palpation and to localize a particular area for examination |
compression cup |
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usnavalmd Mon, 23 Feb 2009 01:04:03 GMT |
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| what is the feature on a fluoro machine that allows the radiologists to select an image brightness that is subsequently maintained automatically by varying the kVp, mAs or sometimes both |
automatic brightness control (ABC) |
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usnavalmd Mon, 23 Feb 2009 01:04:03 GMT |
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| what is a complex electronic device that receives the remnant xray beam and converts it into light and increases the light intensity of the image |
intensifier tube |
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usnavalmd Mon, 23 Feb 2009 01:04:03 GMT |
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| what is similar to intensifying screens that are composed of crystals that cause florescence when struck by xrays. |
fluoroscopic screens |
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usnavalmd Mon, 23 Feb 2009 01:39:38 GMT |
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| what are the three upgrades of the image intensified fluoroscopy machine |
image is observed on a tv monitor via an intensifier tube
the image is brighter
the image is easier to visualize |
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usnavalmd Fri, 20 Feb 2009 18:15:33 GMT |
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| what has conventional fluoroscopy been replaced with |
image intensified fluoroscopy |
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usnavalmd Fri, 20 Feb 2009 18:15:33 GMT |
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| what is the exposure called that a radiologists may take if something of interest is noted during a fluoro exam |
spot film |
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usnavalmd Fri, 20 Feb 2009 18:15:33 GMT |
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| what is the switch called on the fluoro machine that terminates the exposure |
dead man switch |
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usnavalmd Fri, 20 Feb 2009 18:09:41 GMT |
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| what is the primary function of the fluoro unit |
dynamic studies of the motion of internal structures and fluids |
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usnavalmd Fri, 20 Feb 2009 18:09:41 GMT |
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| what year was the fluoroscope invented |
1896 |
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usnavalmd Fri, 20 Feb 2009 18:09:41 GMT |
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| who invented the fluoroscope |
thomas edison |
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usnavalmd Fri, 20 Feb 2009 18:09:41 GMT |
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| what is the most widely used xray machine used in the operating room |
C-arm |
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usnavalmd Fri, 20 Feb 2009 18:04:53 GMT |
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| when using a mobile xray unit in the operating room what consideration must be given |
available space |
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usnavalmd Fri, 20 Feb 2009 18:04:52 GMT |
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| what is the most important thing in the operating theater |
location of the exam |
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usnavalmd Fri, 20 Feb 2009 18:04:52 GMT |
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| what do the applications of the mobile equipment depend upon |
type of exam
size and condition of the patient
location of the exam/patient
available units |
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usnavalmd Fri, 20 Feb 2009 18:04:52 GMT |
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| what are the components of a mobile xray machine |
xray tube
batteries
high tension generator
control panel
drive system |
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usnavalmd Fri, 20 Feb 2009 17:08:16 GMT |
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| what is the typical output of a portable xray machine |
up to 300 mA with a max tube voltage of 125 kVp |
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usnavalmd Fri, 20 Feb 2009 17:08:16 GMT |
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| what type of xray equipment is mounted on wheels and can be pushed by human or mechanicle power with reasonable ease about the hospital |
mobile xray unit |
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usnavalmd Fri, 20 Feb 2009 17:04:54 GMT |
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| what type of xray machine can be carried usually by one person |
portable xray machine |
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usnavalmd Fri, 20 Feb 2009 17:04:54 GMT |
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| what is used when it is necessary to perform xrays on someone who is unable to come to the department |
mobile unit |
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usnavalmd Fri, 20 Feb 2009 17:04:54 GMT |
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| for optimum results exams must be performed where |
in the room specifically designed for it |
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usnavalmd Fri, 20 Feb 2009 17:04:54 GMT |
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| what are the three principal parts of the high voltage section |
high voltage step-up transformer
filament transformer
rectifier |
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usnavalmd Fri, 20 Feb 2009 16:58:58 GMT |
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| what converts low supply voltage into a kilovoltage of the proper waveform and is usually located in a large metal tank in the corner of the room |
high voltage section |
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usnavalmd Fri, 20 Feb 2009 16:58:58 GMT |
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| what usually allows control line compensation |
operating console |
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usnavalmd Fri, 20 Feb 2009 16:58:58 GMT |
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| what part of the exam equipment is most familiar to the tech |
operating console |
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usnavalmd Fri, 20 Feb 2009 16:58:58 GMT |
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| what are the two primary parts of the xray tube |
cathode and anode |
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usnavalmd Fri, 20 Feb 2009 16:52:19 GMT |
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| what part of the exam equipment is rarely seen by the tech |
xray tube |
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usnavalmd Fri, 20 Feb 2009 16:53:50 GMT |
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| what and where is the high voltage generator housed and stored in |
in a cubicle container located in the corner of the examining room |
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usnavalmd Fri, 20 Feb 2009 16:52:19 GMT |
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| what seperates the head of the xray tube and the control console |
a protective lead wall with a viewing lead window |
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usnavalmd Fri, 20 Feb 2009 16:52:19 GMT |
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| are the control console and the head of the xray tube located in one room or two |
two |
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usnavalmd Fri, 20 Feb 2009 16:45:05 GMT |
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| what are the three principal parts of an xray machine |
xray tube
high voltage generator
control console |
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usnavalmd Fri, 20 Feb 2009 16:45:05 GMT |
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| where is the fluoro xray tube usually located in a modern general purpose xray room |
under the exam table |
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usnavalmd Fri, 20 Feb 2009 16:45:05 GMT |
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| what does a modern general purpose xray room usually contain |
radiographic unit and a fluoroscopic unit with an I/I tube |
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usnavalmd Fri, 20 Feb 2009 16:45:05 GMT |
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| what are examples of dedicated machines |
fluoro room
general radiographic room
dedicated chest unit
dedicated head unit
tomographic room
mammo unit
special studies suite
CT
MRI |
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usnavalmd Thu, 19 Feb 2009 17:01:36 GMT |
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| any machine that is designed to be used exclusively for "in department use" and is manufactured specifically for a desired procedure is called what |
permanent equipment |
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usnavalmd Mon, 23 Feb 2009 01:56:12 GMT |
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| what tube current do therapeutic xray machines not exceed |
20 mA |
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usnavalmd Thu, 19 Feb 2009 17:01:36 GMT |
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| what are the max voltages and tube currents diagnostic xray machines usually operate at |
25-150 kVp
100-1200 mA |
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usnavalmd Thu, 19 Feb 2009 17:01:36 GMT |
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| what are xray machines usually identified according to |
the energy of the xrays they produce
the purpose for which those xrays are intended |
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usnavalmd Thu, 19 Feb 2009 16:52:35 GMT |
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| what are examples of exams that do not require alternate imaging |
KUB
IAC- internal auditory canals
carpal tunnel study
TMJ- temporal mandibular joint |
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usnavalmd Thu, 19 Feb 2009 16:49:37 GMT |
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| what procedure uses a CT scanner to visualize the brain and contrast agents to visualize the vessels of the brain |
computerized cranial tomography |
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usnavalmd Thu, 19 Feb 2009 16:49:37 GMT |
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| what procedure uses a xerox process to differentiate the differences between muscle, fat and possible lesions of the breast |
xeromammography |
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usnavalmd Thu, 19 Feb 2009 16:49:37 GMT |
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| what procedure uses iodine based medias that accumulate in the gallbladder to help visualize this structure |
oral cholecystogram |
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usnavalmd Thu, 19 Feb 2009 16:40:36 GMT |
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| what procedure uses barium or gastografin to visualize anatomy and detect abnormalities along the digestive tract |
upper and lower G.I. studies |
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usnavalmd Thu, 19 Feb 2009 16:40:36 GMT |
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| uses magnetic fields and radiowaves while avoiding slight risk that accompanies low radiation doses of CT and conventional radiography |
magnetic resonance imaging (MRI) |
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usnavalmd Thu, 19 Feb 2009 16:40:36 GMT |
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| detectors and components used to reconstruct an image from a collimated xray beam displayed onto a TV Monitor |
computerized tomography (CT) |
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usnavalmd Thu, 19 Feb 2009 16:40:36 GMT |
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| very small current that continually flows through any circuit that inhibits any helpful diagnostic information |
image noise (mottle) |
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usnavalmd Thu, 19 Feb 2009 16:28:56 GMT |
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| use of photoconductive material and a dry processing technique to produce an electrostatic latent image |
xeroradiography |
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usnavalmd Thu, 19 Feb 2009 16:28:56 GMT |
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| what is a movie camera connected to an image intensifier tube to record a given procedure on 16mm, 35mm, or 105mm film called |
cinefluorography |
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usnavalmd Thu, 19 Feb 2009 16:28:56 GMT |
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| what is taking static images during fluoroscopy called |
spot film radiography |
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usnavalmd Thu, 19 Feb 2009 16:28:56 GMT |
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| what type of modality is used with image intensifiers in conjunction with TV cameras and monitors to image the organs and vessels of the body. |
image intensified fluoroscopy |
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usnavalmd Thu, 19 Feb 2009 16:22:29 GMT |
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| procedures are designed to visualize anatomical structures more clearly, usually at the expense of what |
non visualization of other structures |
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usnavalmd Thu, 19 Feb 2009 16:21:26 GMT |
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| what is required in xray diagnoses to obtain the required diagnostic information |
special equipment
specialized techniques |
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usnavalmd Mon, 23 Feb 2009 16:35:49 GMT |
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| modalities other than conventional radiography used to image the body |
alternate imaging |
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usnavalmd Thu, 19 Feb 2009 16:21:26 GMT |
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