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| what is it called when the radiation intensity on the cathode side of the xray field is higher than on the anode side |
anode heel effect |
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usnavalmd Tue, 27 Jan 2009 18:44:19 GMT |
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| what are the advantages of the line focus principle |
large area for heat loading
maintained small effective focal spot size for improved radiographic detail |
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usnavalmd Tue, 27 Jan 2009 18:44:19 GMT |
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| what are the two types of anodes |
rotating anode
stationary anode |
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usnavalmd Tue, 27 Jan 2009 17:53:55 GMT |
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| what are the two parts of the induction motor |
stator
rotor |
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usnavalmd Tue, 27 Jan 2009 17:53:55 GMT |
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| what are the purposes of the xray tube anode |
withstand heat
reduce the size of the xray source |
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usnavalmd Tue, 27 Jan 2009 17:53:55 GMT |
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| radiation intensity on the cathode side of the xray field is higher than on the anode side |
heel effect |
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usnavalmd Tue, 27 Jan 2009 17:00:47 GMT |
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| is the area of the target from which xrays are emitted |
focal spot |
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usnavalmd Tue, 27 Jan 2009 17:00:47 GMT |
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| area projected onto the patient and the film |
EFS |
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usnavalmd Tue, 27 Jan 2009 17:00:47 GMT |
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| a gray white hard, brittle corrosion-resistant metallic element used in high temperature structural materials and electrical elements |
tungsten |
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usnavalmd Tue, 27 Jan 2009 16:29:30 GMT |
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| a stationary part of a machine such as a motor, about which a rotor turns |
stator |
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usnavalmd Tue, 27 Jan 2009 16:29:30 GMT |
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| a common reddish metallic element that is ductile and malleable and one of the best conductors of heat and electricity |
copper |
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usnavalmd Tue, 27 Jan 2009 16:29:30 GMT |
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| a substance or body capable of trasmitting electricity, heat or sound |
conductor |
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usnavalmd Tue, 27 Jan 2009 16:29:30 GMT |
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| what enshrouds the filament and is made of nickel |
focusing cup |
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usnavalmd Tue, 27 Jan 2009 01:06:18 GMT |
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| what is the high melting point of the target |
3,410* C / 6,410* F |
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usnavalmd Tue, 27 Jan 2009 01:06:18 GMT |
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| what is tube current measured in |
mA |
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usnavalmd Tue, 27 Jan 2009 01:06:18 GMT |
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| what determines xray tube current |
number of electrons |
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usnavalmd Tue, 27 Jan 2009 01:06:18 GMT |
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| what is the characteristics of the filament |
source of electrons |
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usnavalmd Tue, 27 Jan 2009 01:02:35 GMT |
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| what is the electrical supply for a cathode in amps and volts |
10 volts
3-5 amps |
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usnavalmd Tue, 27 Jan 2009 01:02:35 GMT |
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| the metallic surface usually of platinum or tungsten upon which the stream of cathode rays within an xray tube is focused and from which the xrays are emitted |
target |
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usnavalmd Tue, 27 Jan 2009 01:02:35 GMT |
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| a cloud of electrons in the vicinity of the filament |
space charge |
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usnavalmd Tue, 27 Jan 2009 01:02:35 GMT |
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| a negatively charged metal shroud in which the filament is embedded |
focusing cup |
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usnavalmd Tue, 27 Jan 2009 00:57:26 GMT |
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| a tenuous conductor made incandescent by passage of an electric current |
filament |
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usnavalmd Tue, 27 Jan 2009 00:57:26 GMT |
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| to tend or move toward one point or another |
converge |
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usnavalmd Tue, 27 Jan 2009 00:57:26 GMT |
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| the loss of vacuum of an xray tube results in what |
electron flow is hindered
fewer xrays produced
more heat is generated
uncontrolled secondary electrons
wide variation in tube current |
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usnavalmd Tue, 27 Jan 2009 00:57:26 GMT |
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| what is the purpose of the pyrex envelope of an xray tube |
maintain vacuum |
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usnavalmd Tue, 27 Jan 2009 00:52:51 GMT |
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| what 2 parts is the induction motor made of |
rotor
strator |
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usnavalmd Tue, 27 Jan 2009 00:52:51 GMT |
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| what are the two main parts of the anode |
target
induction motor |
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usnavalmd Tue, 27 Jan 2009 00:52:51 GMT |
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| what are the basic components of an xray tube |
cathode
anode
glass envelope |
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usnavalmd Tue, 27 Jan 2009 00:52:51 GMT |
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| what are the two parts of a cathode |
filament
focusing cup |
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usnavalmd Tue, 27 Jan 2009 00:49:32 GMT |
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| a shaft made of bars of copper and soft iron fabricated in one mass located inside the xray glass envelope |
rotor |
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usnavalmd Tue, 27 Jan 2009 00:49:32 GMT |
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| used for glass and glassware that contains appreciable oxide of boron and is resistant to heat, chemicals, and electricity |
pyrex |
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usnavalmd Tue, 27 Jan 2009 00:49:32 GMT |
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| the electron emitting electrode of an electron tube |
cathode |
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usnavalmd Tue, 27 Jan 2009 00:49:32 GMT |
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| the electron collecting electrode of an electron tube |
anode |
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usnavalmd Tue, 27 Jan 2009 00:45:31 GMT |
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| what type of xray tubes operate on low kV |
mammography |
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usnavalmd Tue, 27 Jan 2009 00:45:31 GMT |
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| grid bias xray tubes equal what kV |
-2kV |
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usnavalmd Tue, 27 Jan 2009 00:45:31 GMT |
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| what are the four types of modern xray tube designs |
rotating anode
grid controlled
mammography
metal/ceramic |
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usnavalmd Tue, 27 Jan 2009 00:45:31 GMT |
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| what grid controlled xray tube prevents the capacitor from discharging |
grid bias |
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usnavalmd Tue, 27 Jan 2009 00:41:17 GMT |
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| what is a grid controlled xray tube that bridges the focusing cup and is the third electrode |
triode |
2 |
usnavalmd Tue, 27 Jan 2009 01:30:30 GMT |
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| what year was the rotating anode xray tube introduced |
1929 |
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usnavalmd Tue, 27 Jan 2009 00:41:17 GMT |
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| what are some of the disadvantages or characteristics of the crookes tube |
electron flow is hindered
fewer xrays produced
more heat is generated
inefficient producer of xrays
tube mA could not be changed independently of kV |
1 |
usnavalmd Tue, 27 Jan 2009 01:18:59 GMT |
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| an electron tube with an anode, cathode and controlling grid |
triode |
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usnavalmd Mon, 26 Jan 2009 19:58:29 GMT |
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| a metallic element that resembles chromium and tungsten in many properties, is used especially in strengthening and hardening steel |
molybdenum |
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usnavalmd Mon, 26 Jan 2009 19:10:40 GMT |
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| a negative potential across a triode of a grid controlled tube |
grid bias |
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usnavalmd Mon, 26 Jan 2009 19:10:40 GMT |
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| a large partially evecuated glass tube also known as the Httorf Tube |
crookes tube |
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usnavalmd Mon, 26 Jan 2009 19:10:40 GMT |
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| a vacuum xray tube which allowed xray intensity and energy to be selected seperately and with great accuracy |
coolidge tube |
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usnavalmd Mon, 26 Jan 2009 19:10:40 GMT |
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| high speed electrons projected in a stream from the heated cathode of a vacuum tube under the propulsion of a strong electric field |
cathode ray |
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usnavalmd Mon, 26 Jan 2009 17:21:02 GMT |
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| a steel gray lightwieght corrosion resistant rigid metallic element used chiefly as a hardening agent |
beryllium |
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usnavalmd Mon, 26 Jan 2009 17:16:01 GMT |
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| what is the percentage of emitted xrays constituted by emission of characteristic radiation |
10% |
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usnavalmd Mon, 26 Jan 2009 17:16:01 GMT |
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| what is it when an electron with sufficient minimum kinetic energy ejects an inner orbital electron |
characteristic radiation |
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usnavalmd Tue, 27 Jan 2009 01:20:35 GMT |
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| what is it when an electron approaches strongly positive nuclear field causing deviation from initiial path |
braking radiation |
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usnavalmd Mon, 26 Jan 2009 17:16:00 GMT |
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| at 80 kV how much of the energy is xrays and how much energy is heat |
.6% xrays
99.4% heat |
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usnavalmd Mon, 26 Jan 2009 15:17:19 GMT |
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| the narrower the electron beam, the smaller the focus, the ________ the xray image |
sharper |
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usnavalmd Mon, 26 Jan 2009 15:17:19 GMT |
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| what directs the electron stream to the anode |
focusing cup |
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usnavalmd Mon, 26 Jan 2009 15:17:19 GMT |
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| what are the things needed to produce xrays |
separation of electrons
production of high speed electrons
focusing of electrons
stopping of high speed electrons in target |
3 |
usnavalmd Tue, 27 Jan 2009 01:34:40 GMT |
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| an electrically charged particle emitted by an incandescent substance |
thermions |
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usnavalmd Mon, 26 Jan 2009 02:06:44 GMT |
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| the giving off of electrons from the surface of a heated metal |
thermionic emisions |
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usnavalmd Mon, 26 Jan 2009 02:06:44 GMT |
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| a low current of electricity which flows through the filament of the cathode |
filament current |
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usnavalmd Mon, 26 Jan 2009 02:06:44 GMT |
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| white, glowing, or luminous with intense heat |
incandescence |
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usnavalmd Mon, 26 Jan 2009 02:06:44 GMT |
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| who invented the hot cathode xray tube |
william coolidge |
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usnavalmd Mon, 26 Jan 2009 02:00:26 GMT |
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| what xray tube was recognized as being far superior to the crookes tube |
hot cathode xray tube |
1 |
usnavalmd Tue, 27 Jan 2009 01:19:51 GMT |
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| who suffered the first radiographic fatality in the US in 1904 |
clarence dally |
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usnavalmd Mon, 26 Jan 2009 02:00:26 GMT |
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| what year was the fluoroscope invented |
1898 |
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usnavalmd Mon, 26 Jan 2009 02:00:26 GMT |
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| who developed the fluoroscope |
thomas edison |
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usnavalmd Mon, 26 Jan 2009 01:55:29 GMT |
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| who was able to reduce exposure time by use of double emulsion |
charles leonard |
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usnavalmd Mon, 26 Jan 2009 01:55:29 GMT |
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| what was the length of exposure time prior to using intensifying sceens |
30 minutes or more |
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usnavalmd Mon, 26 Jan 2009 01:55:29 GMT |
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| who demonstrated technique of reducing exposure times by using an intensifying screen in conjunction with glass photographic plates in 1896 |
michael pupin |
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usnavalmd Mon, 26 Jan 2009 01:55:29 GMT |
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| who received the first nobel prize for physics in 1901 |
roentgen |
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usnavalmd Mon, 26 Jan 2009 01:50:49 GMT |
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| on what date did wilhelm conrad roentgen discover xray |
nov 8, 1895 |
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usnavalmd Mon, 26 Jan 2009 01:50:49 GMT |
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| who developed a partially evacuated glass tube which bears his name |
sir william crookes |
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usnavalmd Mon, 26 Jan 2009 01:50:49 GMT |
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| who was the forerunner of modern fluorescent lamps & neon sign type lamps |
sir william crookes |
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usnavalmd Mon, 26 Jan 2009 01:50:49 GMT |
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