Lobel Quiz from Tutor

What is thermionic emission?

• Process where electrons are boiled off a filament

• Formation of an electron cloud around a filament

• Accumulation of gas in a tube

• Difference in brightness between two details

What is the function of space charge in a tube?

• To create a state of equilibrium by having a maximum amount of electrons

• To increase the brightness of an image

• To measure the overall visibility

• To alter the remnant beam condition

What is tube arcing?

• A type of tube failure due to tungsten vaporization

• A method to increase image sharpness

• A process to optimize contrast resolution

• A technique to reduce noise

What does contrast resolution measure?

• The proportional difference between the brightness of two adjacent details

• The ability to distinguish one object from the next

• The overall visibility of an image

• The frequency of a wavelength

What is the primary beam?

• Radiation emitted from the tube that has not gone through the patient

• Radiation that emerges from body tissues behind the patient

• A stream of electrons that go across and then down

• A device that alters the remnant beam condition

What is the line focus principle?

• It deals with the angle of the anode to increase image sharpness

• It measures the overall visibility of an image

• It is used to compare one exposure to another

• It is a process where electrons are boiled off a filament

What is the relationship between wavelength and frequency?

• Higher energy (kV) results in a smaller wavelength

• Higher energy (kV) results in a larger wavelength

• Wavelength and frequency are unrelated

• Frequency decreases as wavelength increases

What is noise in the context of imaging?

• Unwanted information that obscures visibility

• A method to increase image sharpness

• A process to optimize contrast resolution

• A technique to alter the remnant beam condition

What is the term used to describe the radiation emitted when charged particles are decelerated?

• Photoelectric effect

• Compton scattering

• Bremsstrahlung

• Coherent scattering

What is the typical warm-up time mentioned for a 70 kVp X-ray tube operating at 200 mA?

• 1 second

• 5 seconds

• 10 seconds

• 15 seconds