Format of the CT image..
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Each pixel in the CT image can have a range of gray shades, The image can
have 256(28), 512(29), 1024(210), or 2048(211) different grayscale values,
Because these are represented by bits a Ct image can be characterized by
the number of bits per pixel. CT images can have 8,9,10,11, or 12 bits per
pixel. Bit depth is the series of bit planes that make up the image. The
numerical value of the pixel represents the brightness of the image at that
pixel position.
Physical principles
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, Data Acquisition, Data processing, Format of CT image, Data flow in a CT
scanner, Sequence of events, Advantages of CT, Limitations of CT
Advantages of CT
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Excellent low contrast resolution is possible due to: a highly collimated
beam, more sensitive radiation detectors, contrast, resolution is 4(MRI is a 1,
x-ray is a 10), Window and Leveling, Volume data acquisition in a single
breath, 3D imaging, multiplanar image reformatting, CT angiography
Goal of CT
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Minimal superimposition, Improved image contrast, very small differences
in tissue contrast
Technological considerations
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Goal of CT scanner, produce high quality images with minimal radiation
dose and physical discomfort to the patient
Give this one a try later!
Each pixel in the CT image can have a range of gray shades, The image can
have 256(28), 512(29), 1024(210), or 2048(211) different grayscale values,
Because these are represented by bits a Ct image can be characterized by
the number of bits per pixel. CT images can have 8,9,10,11, or 12 bits per
pixel. Bit depth is the series of bit planes that make up the image. The
numerical value of the pixel represents the brightness of the image at that
pixel position.
Physical principles
Give this one a try later!
, Data Acquisition, Data processing, Format of CT image, Data flow in a CT
scanner, Sequence of events, Advantages of CT, Limitations of CT
Advantages of CT
Give this one a try later!
Excellent low contrast resolution is possible due to: a highly collimated
beam, more sensitive radiation detectors, contrast, resolution is 4(MRI is a 1,
x-ray is a 10), Window and Leveling, Volume data acquisition in a single
breath, 3D imaging, multiplanar image reformatting, CT angiography
Goal of CT
Give this one a try later!
Minimal superimposition, Improved image contrast, very small differences
in tissue contrast
Technological considerations
Give this one a try later!
Goal of CT scanner, produce high quality images with minimal radiation
dose and physical discomfort to the patient
