15 Questions
What is the primary purpose of data acquisition in CT?
To collect views from the patient to produce the CT image
What is the term for the reduction of the intensity of a beam of radiation as it passes through an object?
Attenuation
What is measured by the detectors during data acquisition?
Relative transmission values
How are structures represented in a CT image?
By varying shades of gray
What is the problem in CT image reconstruction?
Determining the attenuation in the tissues
What is an advantage of gas-filled detectors?
Less expensive
What is the purpose of the photodiode in a solid-state detector?
To transform light energy into electrical energy
What is a characteristic of scintillation crystals used in solid-state detectors?
They fluoresce when struck by an x-ray photon
What is the function of the analog-to-digital converter (ADC) in detector electronics?
To convert the analog signal to digital
What is the primary function of the data-acquisition system (DAS) in CT?
To measure and process the detector signals
What is a disadvantage of gas-filled detectors?
The gas must be kept under pressure
What is the term for the process of converting light energy into electrical energy in a solid-state detector?
Transduction
What is a characteristic of solid-state detectors?
They have 100% absorption efficiency and no afterglow
What is the role of the detector array in CT?
To measure the x-ray photons and produce an electrical signal
What is the purpose of the detector electronics in CT?
To measure and process the detector signals
Learn about the milestones and pioneers in the development of Computed Tomography (CT) scans, including the first brain scan and Nobel Prize winners. Test your knowledge of the history of CT scans and their evolution.
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