X-ray Detection Efficiency Quiz

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What does the term 'conversion efficiency' refer to?

The stability of the detector with time

The ability to convert x-ray signals to electrical signals (correct)

The speed at which the detector detects x-ray events

The temperature sensitivity of the detector

Why is a nonideal detector system indicated by an overall efficiency value of less than 1?

Because it necessitates an increase in patient radiation dose for image quality maintenance (correct)

Because it leads to faster response times

Because it requires lower patient radiation doses

Because it is insensitive to temperature variations

What type of detectors are used in CT systems to minimize patient radiation dose?

Detectors with low overall efficiency

Detectors that are very stable with time

Detectors with high overall efficiency (correct)

Detectors with small dynamic range

What is the purpose of adaptive section collimation in CT systems?

To optimize image quality and minimize patient dose Signup and view all the answers

How do gas-ionization detectors convert x-ray energy into electrical energy?

By converting x-ray energy directly into electrical energy Signup and view all the answers

Why should the response times of detectors be very short in CT systems?

To detect x-ray events rapidly and recover quickly for subsequent events Signup and view all the answers

What type of detectors are used in modern MSCT scanners?

Solid-state detector arrays Signup and view all the answers

What is the primary function of the data acquisition system (DAS) in CT scanners?

To process and transmit the detector data Signup and view all the answers

Which of the following techniques is used to reduce unnecessary radiation exposure in CT scanning?

Adaptive section collimation Signup and view all the answers

What is the primary advantage of solid-state detectors over gas-ionization detectors in CT scanners?

Both faster response time and higher efficiency Signup and view all the answers

Which component of the CT scanner is responsible for converting the measured radiation into digital data?

Data acquisition system (DAS) Signup and view all the answers

What is the purpose of adaptive section collimation in CT scanning?

To block parts of the x-ray beam that expose tissue outside the imaging volume Signup and view all the answers

Which technology helps in reducing overexposure to tissues during spiral scanning in CT?

Adaptive section collimation Signup and view all the answers

What is an essential characteristic of CT detectors for good image quality production?

High absorption efficiency Signup and view all the answers

Which factor does absorption efficiency of CT detectors depend on?

Physical density of the detector Signup and view all the answers

Which characteristic of detectors determines how efficiently they can obtain photons transmitted from the patient?

Size of detector area facing the x-ray beam Signup and view all the answers

How do CT detectors convert radiation from the patient into information?

By converting x-ray photons to electrical signals Signup and view all the answers

X-ray Detection Efficiency Quiz

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