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Questions and Answers
What does capture efficiency in CT detectors refer to?
Which characteristic is NOT essential for CT detectors in image production?
What type of detector converts x-ray energy directly to electrical energy?
Which of the following materials is commonly used in scintillation detectors?
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Absorption efficiency in CT detectors is influenced by which of the following factors?
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Study Notes
High-Voltage Generator (HVG)
- Generates high voltage potential between the x-ray tube's cathode and anode.
CT Detectors
- Capture x-ray photons and convert them into electrical signals.
- Essential characteristics include high capture, absorption, and conversion efficiency.
- Capture efficiency depends on detector area and inter-detector distance.
- Absorption efficiency depends on the detector's atomic number, density, size, and thickness.
- Conversion efficiency describes how well the detector converts photons into electrical signals.
Detector Types
- Act as image receptors, measuring remnant radiation and converting it into electrical signals.
- Two main types: scintillation (solid-state) and ionization (gas, e.g., xenon).
- Materials used include cadmium tungstate, cesium iodide, gadolinium, or yttrium.
Scintillation Detectors
- Convert x-rays to light, then light to electrical energy.
Gas Ionization Detectors
- Directly convert x-ray energy to electrical energy.
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Description
Explore the principles behind high-voltage generators and various types of CT detectors used in medical imaging. This quiz covers the functioning of scintillation and gas ionization detectors, their characteristics, and efficiency factors. Test your knowledge on how these components capture and convert x-ray radiation into electrical signals.
