| front |
back |
revisions |
lasted changed by |
history |
| Two types of Anode |
Stationary
Rotating |
0 |
noypi69 Tue, 27 Jan 2009 19:00:02 GMT |
 |
| Two components of an anode |
Rotor located inside, made of copper and soft iron.
Stator located outside |
0 |
noypi69 Tue, 27 Jan 2009 19:00:02 GMT |
|
| What is the main purpose of the anode |
To withstand high heat |
0 |
noypi69 Tue, 27 Jan 2009 19:00:02 GMT |
|
| The area of the target from which x-rays are emitted |
Focal Spot |
0 |
noypi69 Tue, 27 Jan 2009 19:00:02 GMT |
|
| EFS |
Effective focal spot size
Area projected onto the patient and the film |
0 |
noypi69 Tue, 27 Jan 2009 19:00:02 GMT |
|
| A gray white hard, brittle corrosion resistant metallic element used in high temperature. Structural materials and electrical elements |
Tungsten |
0 |
noypi69 Tue, 27 Jan 2009 19:00:02 GMT |
|
| Stationary part of a machine such as a motor, about which a rotor turns |
Stator |
0 |
noypi69 Tue, 27 Jan 2009 19:00:02 GMT |
|
| Common reddish metallic element that is ductile and malleable and one of the best conductors of heat and electricity |
Copper |
0 |
noypi69 Tue, 27 Jan 2009 19:00:02 GMT |
|
| Substance or body capable of transmitting electricit, heat or sound |
Conductor |
1 |
noypi69 Tue, 27 Jan 2009 19:23:22 GMT |
|
| What is the purpose of the focusing cup |
To focus the electron. Cause electron stream to converge onto the target anode |
0 |
noypi69 Tue, 27 Jan 2009 19:00:02 GMT |
|
| Two (2) components of a cathode |
Filament
Focusing Cup |
0 |
noypi69 Tue, 27 Jan 2009 18:52:09 GMT |
|
| Metallic surface usually of platinum or tungsten upon which the stream of cathode rays within an x-ray tube is focused and from which the x-rays are emitted |
Target |
0 |
noypi69 Tue, 27 Jan 2009 18:52:09 GMT |
|
| A cloud of electrons in the vicinity of the filament |
Space Charge |
0 |
noypi69 Tue, 27 Jan 2009 18:52:09 GMT |
|
| Negatively charged metal shroud in which the filament is embedded |
Focusing cup |
0 |
noypi69 Tue, 27 Jan 2009 18:52:09 GMT |
|
| A tenuous conductor made incandescent by the passage of an electric current |
Filament |
0 |
noypi69 Tue, 27 Jan 2009 18:52:09 GMT |
|
| To tend or move toward one point or another |
Converge |
0 |
noypi69 Tue, 27 Jan 2009 18:52:09 GMT |
|
| 5 things that can happen with loss of vacuum |
Electron flow is hinderd
Fewer x-rays produced
More heat generated
Uncontrolled secondary electrons
Wide variations in the tube current |
0 |
noypi69 Tue, 27 Jan 2009 18:52:09 GMT |
|
| The purpose of the pyrex glass envalope |
Maintain vacuum |
0 |
noypi69 Tue, 27 Jan 2009 18:52:09 GMT |
|
| Material use as glass enclosure |
Pyrex |
1 |
noypi69 Tue, 27 Jan 2009 21:11:45 GMT |
|
| Melting Point of tungsten |
3410 C |
0 |
noypi69 Tue, 27 Jan 2009 18:52:09 GMT |
|
| Components of X-ray tube |
Cathode
Anode
Glass envelope |
0 |
noypi69 Tue, 27 Jan 2009 18:52:09 GMT |
|
| A shaft made of bars of copper and soft iron fabricated in one mass, located inside the x-ray glass envelope |
Rotor |
0 |
noypi69 Tue, 27 Jan 2009 18:52:09 GMT |
|
| Used for glass and glassware that contains appreciable Oxide of Boron and is resistant to heat chemicals and electricity |
Pyrex |
1 |
noypi69 Tue, 27 Jan 2009 21:09:41 GMT |
|
| Electron emitting electrode of an electron tube |
Cathode |
0 |
noypi69 Tue, 27 Jan 2009 18:52:09 GMT |
|
| Electron collecting electrode of an electron tube |
Anode |
0 |
noypi69 Tue, 27 Jan 2009 18:52:09 GMT |
|
| The designs of modern X-ray tubes |
Rotating Anode
Grid controlled (which equals 2kV)
Mammography tube - operated at low kV (less than 50kVp) |
0 |
noypi69 Tue, 27 Jan 2009 18:52:09 GMT |
|
| Disadvantage of Coolidge tube (hot cathode) |
Independent control of kV and mA
Intensity and energy of X-ray beam can be selected separately with great accuracy |
0 |
noypi69 Tue, 27 Jan 2009 18:52:09 GMT |
|
| Characteristics of a Coolidge tube (hot cathode) |
Compatible for use with Snook transformer
Vacuum tube allows intesnsity and energy to be selected seperatly and with great accuracy
Normally made of two electrodes (a diode) in a glass tube |
0 |
noypi69 Tue, 27 Jan 2009 18:52:09 GMT |
|
| Disadvantages of Crookes tube |
Electron flow hindered
Fewer X-ray produced
More heat generated |
0 |
noypi69 Tue, 27 Jan 2009 18:52:08 GMT |
|
| An electron tube with an anode, a cathode and controlling grid |
Triode |
0 |
noypi69 Tue, 27 Jan 2009 18:52:08 GMT |
|
| A metallic element that resembles chromium and tungsten in amny properties, is used especially in strengthening and hardening steel |
Molybdenum |
0 |
noypi69 Tue, 27 Jan 2009 18:52:08 GMT |
|
| Negative potential across a triode of a grid controlled tube |
Grid Bias |
0 |
noypi69 Tue, 27 Jan 2009 18:52:08 GMT |
|
| Large partially evacuated glass tube |
Crookes Tube |
0 |
noypi69 Tue, 27 Jan 2009 18:52:08 GMT |
|
| A Vacuum X-ray tube which allowed x-ray intensity and energy to be selectred seperatly and with great accuracy |
Coolidge Tube |
0 |
noypi69 Tue, 27 Jan 2009 18:52:08 GMT |
|
| 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 |
1 |
noypi69 Tue, 27 Jan 2009 23:45:46 GMT |
|
| A steel-grey, light wieght corrosion resistant, rigid, metallic element used chiefy as a hardening agent |
Beryllium |
0 |
noypi69 Tue, 27 Jan 2009 18:52:08 GMT |
|
| % if heat produced in x-ray |
99.4% |
0 |
noypi69 Tue, 27 Jan 2009 18:52:08 GMT |
|
| How are high speed electrons produced? |
High potential differences (KV) applied across the tube.
WHICH
Gives filament very high negative charge
Gives anode an equally high positive charge. |
1 |
noypi69 Wed, 28 Jan 2009 00:05:34 GMT |
|
| Four (4) conditions necessary for productions of x-rays |
Seperation
Production
Focusing
Stopping |
0 |
noypi69 Tue, 27 Jan 2009 18:52:08 GMT |
|
| Principles of X-ray production |
Rapid Deceleration
Cascade effect |
0 |
noypi69 Tue, 27 Jan 2009 18:52:08 GMT |
|
| An electrically charged particle emitted by an incandescent substance |
Thermions |
0 |
noypi69 Tue, 27 Jan 2009 18:52:08 GMT |
|
| A low current of electricity which flows through the filament of the cathode |
Fialment Current |
0 |
noypi69 Tue, 27 Jan 2009 18:52:08 GMT |
|
| White, glowing, or luminous with intense heat |
Incandescent |
0 |
noypi69 Tue, 27 Jan 2009 18:52:08 GMT |
|
| Unveiled the hot cathode x-ray tube in 1913 |
William D Coolidge |
0 |
noypi69 Tue, 27 Jan 2009 18:52:08 GMT |
|
| Developed the Fluorescope and Fluorescence in 1898 |
Thomas Edison |
0 |
noypi69 Tue, 27 Jan 2009 18:52:08 GMT |
|
| Denonstrated technique of reducing exposure times and enhancing the image by using double emulsion radiography in 1904 |
Charles Leonard |
0 |
noypi69 Tue, 27 Jan 2009 18:52:08 GMT |
|
| Demonstrated the technique of reducing exposure times by using an intensifying screen in conjunction with glass photographic plates in 1896 |
Michael Pupin |
0 |
noypi69 Tue, 27 Jan 2009 18:52:08 GMT |
|
| Discoverd x-rays on Nov 8 1895 |
Roentgen |
0 |
noypi69 Tue, 27 Jan 2009 18:52:08 GMT |
|
| Developed large partially evacuated glass tube |
William Crookes |
0 |
noypi69 Tue, 27 Jan 2009 18:52:08 GMT |
|
