Podcast
Questions and Answers
What is the primary function of the photocathode in a photomultiplier tube?
What is the primary function of the photocathode in a photomultiplier tube?
- To focus the electrons
- To produce photoelectrons (correct)
- To amplify the electrons
- To collect the electrons at the anode
What happens when the primary electrons collide with the first dynode surface?
What happens when the primary electrons collide with the first dynode surface?
- The electrons are reflected back to the photocathode
- The electrons are amplified by the dynode
- The electrons liberate more electrons (correct)
- The electrons are absorbed by the dynode
What is the final stage of the electron amplification process in a photomultiplier tube?
What is the final stage of the electron amplification process in a photomultiplier tube?
- The production of photoelectrons by the photocathode
- The collision with the first dynode surface
- The focusing of electrons by the focusing electrode
- The collection of electrons at the anode (correct)
What is the purpose of a pixelated grid in a conventional gamma camera?
What is the purpose of a pixelated grid in a conventional gamma camera?
Why is it important to minimize scattered gamma photons in gamma ray collimation?
Why is it important to minimize scattered gamma photons in gamma ray collimation?
What does the gamma image produced by a conventional gamma camera represent?
What does the gamma image produced by a conventional gamma camera represent?
What is the role of the focusing electrode in a photomultiplier tube?
What is the role of the focusing electrode in a photomultiplier tube?
What is the result of the cascade procedure in a photomultiplier tube?
What is the result of the cascade procedure in a photomultiplier tube?
What is the main drawback of the current gamma camera collimators?
What is the main drawback of the current gamma camera collimators?
What is the primary function of a gamma camera collimator?
What is the primary function of a gamma camera collimator?
What type of material is commonly used in the high-density plate of a parallel hole collimator?
What type of material is commonly used in the high-density plate of a parallel hole collimator?
Why is the hexagonal structured hole arrangement used in parallel hole collimators?
Why is the hexagonal structured hole arrangement used in parallel hole collimators?
What determines the appropriate type of collimator for gamma ray detection?
What determines the appropriate type of collimator for gamma ray detection?
What is the purpose of gamma ray collimation?
What is the purpose of gamma ray collimation?
What is the most common type of collimator used in gamma image formation?
What is the most common type of collimator used in gamma image formation?
What would improve the gamma imaging outcome?
What would improve the gamma imaging outcome?
What is the primary concern when designing a collimator body?
What is the primary concern when designing a collimator body?
What is the main difference between diverging and converging collimators?
What is the main difference between diverging and converging collimators?
What type of collimator is used for scanning small targeted areas?
What type of collimator is used for scanning small targeted areas?
What is the purpose of a pinhole collimator?
What is the purpose of a pinhole collimator?
What is the typical diameter range of a pinhole collimator's aperture?
What is the typical diameter range of a pinhole collimator's aperture?
What type of material is often used to make pinhole collimators?
What type of material is often used to make pinhole collimators?
In which applications is the pinhole collimator particularly effective?
In which applications is the pinhole collimator particularly effective?
What do converging and diverging collimators have in common?
What do converging and diverging collimators have in common?
What is the required pinhole diameter for small targeted structures in small animal gamma imaging systems?
What is the required pinhole diameter for small targeted structures in small animal gamma imaging systems?
What is the characteristic of a low-energy collimator?
What is the characteristic of a low-energy collimator?
What is the purpose of a high-resolution collimator?
What is the purpose of a high-resolution collimator?
What is the characteristic of a general purpose collimator?
What is the characteristic of a general purpose collimator?
What is the trade-off of a high-sensitivity collimator?
What is the trade-off of a high-sensitivity collimator?
Why is higher spatial resolution required in small animal gamma imaging systems?
Why is higher spatial resolution required in small animal gamma imaging systems?
What is the characteristic of a high-resolution collimator compared to a general purpose collimator?
What is the characteristic of a high-resolution collimator compared to a general purpose collimator?
What is the purpose of using a collimator with smaller holes?
What is the purpose of using a collimator with smaller holes?
What is the purpose of using medium-energy collimators?
What is the purpose of using medium-energy collimators?
What is the limitation of conventional planar gamma imaging?
What is the limitation of conventional planar gamma imaging?
How many types of emission tomography are mentioned in the text?
How many types of emission tomography are mentioned in the text?
What occurs every 6° during a SPECT scan?
What occurs every 6° during a SPECT scan?
How many views are taken from different directions in a SPECT scan?
How many views are taken from different directions in a SPECT scan?
What is the approximate total scanning time for a SPECT scan?
What is the approximate total scanning time for a SPECT scan?
What is the consequence of using a parallel hole collimator in SPECT?
What is the consequence of using a parallel hole collimator in SPECT?
What is the purpose of emission tomography?
What is the purpose of emission tomography?
What is the benefit of using SPECT over conventional static imaging?
What is the benefit of using SPECT over conventional static imaging?
