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Imaging Ch.8
X-Ray Production
| Question | Answer |
|---|---|
| Purpose of x-ray tube | Take electrons created at the filament, accelerate them and then focus a large number of electrons on a small target (anode) with high velocity. |
| Heat Production | -Over 99% of the kinetic energy of projectile electrons required to produce x-rays is converted to heat. -Only 1% of the kinetic energy is converted to x-rays. |
| Characteristic Radiation | Projectile electrons interact with an inner-shell electron of the target rather than the outer shell electron. |
| Bremsstrahlung Radiation | Projectile electrons looses its kinetic energy when passing close to the nucleus and its path is diverted or the initial path travel is slowed down. |
| When _____________ interact with target electrons, the kinetic energy of the electrons are transformed into thermal energy (heat) and electromagnetic energy (x-rays) | Projectile electrons. |
| Factors affecting emission spectrum: | Voltage waveform. |
| Kinetic Energy | Is the energy of motion. |
| Only the K-characteristics x-rays of __________ are useful for imaging. | Tungsten. |
| Characteristic X-rays | Are emitted when an outer-shell electron fills an inner-shell void. |
| Approximately _____ of the genetic energy of electrons form the cathode is converted to heat. | 99%. |
| This type of x-radiation is called ____________ because it is characteristic of the target element. | Characteristic. |
| Bremsstrahlung X-rays | Are produced when a projectile electron is slowed by the nuclear field or a target atom nucleus. |
| In the diagnostic range, most x-rays are _________________ X-rays. | Bremsstrahlung. |
| A ___________________ contains only specific values. | Discrete spectrum. |
| _______________ x-ray energy is associated with the _____________ x-ray wavelength. | Maximum; minimum. |
| A __________________ contains all possible values. | Continuous spectrum. |
| Characteristic X-rays | Have precisely fixed (discrete) energies and form a discrete emission spectrum. |
| Bremsstrahlung X-rays | Have a range of energies and form a continuous emission spectrum. |
| A change in ______ or ______ results in a proportional change in the amplitude of the x-ray emission spectrum at all energies. | mA; mAs. |
| A change in _______ affects both the amplitude and the position of the x-ray emission spectrum. | kVp. |
| A change in _______ has no effect on the position of the discrete x-ray emission spectrum. | kVp. |
| In the diagnostic range a ______ increase in kVp is equivalent to doubling the mAs. | 15%. |
| The result of added filtration is an ________ in the average energy of the x-ray beam with an accompanying reduction in x-ray quantity. | Increase. |
| Increasing target ________________ enhances the efficiency of x-ray production and the energy of characteristic and bremsstrahlung x-rays. | Atomic number. |
| Because of reduced ripple, operation with ________________ or high frequency is equivalent to an approximate 12% increase in kVp, or almost a doubling of mAs over ______________. | Three-phase power; single-phase power. |
Created by:
sassyrad
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