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Questions and Answers
Which CT generation has a rotate/rotate mechanism and a wide fan beam?
Which CT generation has a rotate/rotate mechanism and a wide fan beam?
What do you call the ability to distinguish one soft tissue from another without regard for size and shape?
What do you call the ability to distinguish one soft tissue from another without regard for size and shape?
What is the Hounsfield unit for water?
What is the Hounsfield unit for water?
Who developed a mathematical equation used to reconstruct CT images?
Who developed a mathematical equation used to reconstruct CT images?
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What does the word 'tomo' mean?
What does the word 'tomo' mean?
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What is the old term for CT-scan?
What is the old term for CT-scan?
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What limits the area of the patient that intercepts the useful beam?
What limits the area of the patient that intercepts the useful beam?
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Which of the following is the synchronous movement of the detector and the tube?
Which of the following is the synchronous movement of the detector and the tube?
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What type of generator is used in CT scan machines?
What type of generator is used in CT scan machines?
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Who introduced tomography in 1970?
Who introduced tomography in 1970?
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What determines the time between the end of imaging and reconstruction time in a CT computer?
What determines the time between the end of imaging and reconstruction time in a CT computer?
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What is the part of the gantry that restricts the x-ray beam produced?
What is the part of the gantry that restricts the x-ray beam produced?
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What is the effect of opening the collimation in a single detector CT?
What is the effect of opening the collimation in a single detector CT?
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What affects spatial resolution in a CT scanner?
What affects spatial resolution in a CT scanner?
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What determines the slice thickness of multiple detector array CT scanners?
What determines the slice thickness of multiple detector array CT scanners?
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What is the process by which an image is acquired during CT and stored in computer memory and then reconstructed?
What is the process by which an image is acquired during CT and stored in computer memory and then reconstructed?
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Study Notes
CT Scan Generations
- 3rd generation CT scanners have a rotate/rotate mechanism and a wide fan beam.
Radiographic Properties
- Radiolucent: allows radiation to pass through.
- Radiopaque: blocks radiation.
- Radiodense: absorbs radiation.
- Radioparent: transparent to radiation.
CT Image Resolution
- Contrast Resolution: the ability to distinguish one soft tissue from another without regard to size and shape.
- Spatial Resolution: the ability to distinguish between two points in an image.
Hounsfield Unit
- Water has a Hounsfield unit of 0.
CT Scan History
- Godfrey Hounsfield developed a mathematical equation for reconstructing CT images.
- Johann Radon introduced tomography in 1970.
- The term "tomo" means "section" or "slice".
CT Scan Principles
- CT scan is a series of x-ray images taken from different angles and uses computer processing to create images of soft tissue in the body.
- Tomography: the process of imaging a slice of the body.
CT Scan Equipment
- Gantry Assembly: also known as a "doughnut shape equipment".
- Collimator: limits the area of the patient that intercepts the useful beam.
Old Term for CT Scan
- The old term for CT scan is Computed Axial Tomography.
CT Scan Movement
- Synchronous movement of the detector and the tube is known as rotating.
- Pitch: the relationship between the patient couch movement and x-ray beam width.
CT Scan Generators
- 3 Phase 6 pulse and 3 Phase 12 pulse generators are used in CT scan machines.
CT Scan Computer
- Microprocessors: determines the time between the end of imaging and the reconstruction time.
CT Scan Technical Factors
- Contrast: a technical factor that can be manipulated by the radiographer.
- Opening the collimation in a single detector CT increases slice thickness, dose to the patient, and scattered radiation.
Spatial Resolution
- Factors affecting spatial resolution: pixel size, slice thickness, voxel size, and detector size.
CT Scan Image Acquisition
- The slice thickness of multiple detector array CT scanners is determined by the width of the detectors in the slice thickness dimension.
- Filtered Back Projection: the process of acquiring an image during CT and storing it in computer memory, then reconstructing it.
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Description
Quiz on CT scan generations and radiology concepts, including beam mechanisms, radiation properties, and imaging resolutions.
