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History of Computed Tomography (CT) Scans

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History of Computed Tomography (CT) Scans

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Questions and Answers

What is the primary purpose of data acquisition in CT?

To process the image

To display the image

To store the raw data

To collect views from the patient to produce the CT image (correct)

What is the term for the reduction of the intensity of a beam of radiation as it passes through an object?

Absorption

Transmission

Attenuation (correct)

Scattering

What is measured by the detectors during data acquisition?

Relative transmission values (correct)

X-ray tube voltage

Intensity of radiation

Attenuation coefficients

How are structures represented in a CT image?

By varying shades of gray Signup and view all the answers

What is the problem in CT image reconstruction?

Determining the attenuation in the tissues Signup and view all the answers

What is an advantage of gas-filled detectors?

Less expensive Signup and view all the answers

What is the purpose of the photodiode in a solid-state detector?

To transform light energy into electrical energy Signup and view all the answers

What is a characteristic of scintillation crystals used in solid-state detectors?

They fluoresce when struck by an x-ray photon Signup and view all the answers

What is the function of the analog-to-digital converter (ADC) in detector electronics?

To convert the analog signal to digital Signup and view all the answers

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

To measure and process the detector signals Signup and view all the answers

What is a disadvantage of gas-filled detectors?

The gas must be kept under pressure Signup and view all the answers

What is the term for the process of converting light energy into electrical energy in a solid-state detector?

Transduction Signup and view all the answers

What is a characteristic of solid-state detectors?

They have 100% absorption efficiency and no afterglow Signup and view all the answers

What is the role of the detector array in CT?

To measure the x-ray photons and produce an electrical signal Signup and view all the answers

What is the purpose of the detector electronics in CT?