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The X-Ray Tube
Operation and parts
| Question | Answer |
|---|---|
| The parts of the x-ray tube are? | Cathode, anode, envelop, protective housing |
| The cathode assembly consists of? | Filaments, focusing cup and associated wiring |
| A ______ focusing cup maintains the cup at a more negative voltage than the filament. | Biased |
| The anode assembly consists of? | Anode, stator and rotor |
| The physical area of the focal track that is impacted is called the _______? | Actual focal spot |
| The area of the focal spot that is projected out of the tube toward the object being x-rayed is called the ________? | Effective focal spot |
| What is the purpose of the line focus principle? | To reduce the effective area of the focal spot. |
| The effective focal-spot size is controlled by _________________. | The size of the actual focal spot and the anode target angle |
| When the target angle is less than 45 degrees, the effective focal spot is ___________. | Smaller than the actual focal spot |
| The most common diagnostic radiography target angle is ___ degrees. | 12 |
| Tubes are available with angles ranging from | 7 to 17 degrees. |
| Diagnostic tubes are available with focal spots of ___mm to ____mm. | 0.1 to 3.0 mm. |
| Because of the geometry of the angled anode target, the radiation intensity is greater on the ___________ side | Cathode |
| The _______ is the only part of cathode or anode assembles that is located _________ the vacuum of the envelope. | Outside |
| Leakage radiation must not exceed ___________. | 100 mR/hour at 1 meter. |
| ___________________ is composed of photons that were not produced at the focal spot. | Off-focus radiation |
| A hot metal filament gives off electrons by a process called ___________. | Thermionic emission |
| If no kilovoltage is applied, the emitted electrons remain near the filament as a(n) ___________. | Space charge |
| Space charge electrons are driven over to the anode at high speed by ___________________. | The large potential difference. |
| A typical x-ray tube is a __________ diode. | Thermionic |
| Special rotating anode tubes with 0.3mm focal spots have been designed for _____________ radiography. | Magnification |
| The diagnostic range of x-ray units in mA is approximately _________________ mA. | 10 - 1200 |
| The diagnostic range of x-ray units in seconds is __________ seconds. | 0.001 - 10 |
| The diagnostic range of x-ray units in kVp is ________ kVp. | 25 - 150 |
| Nearly all x-ray equipment operates from an incoming line of __________ volts. | 210 - 220 |
| ______________ power permits the potential difference to drop to 0 with every change in the direction of current flow. | Single-phase |
| Backup times cannot exceed the tube limit and should be set at _____% of the anticipated manual exposure mAs. | 150 |
Created by:
rad1958tech