20 Questions
What is the range of the floating point numbers resulting from the CT reconstruction process?
From 0.0 to 1.0
Which of the following represents the CT number for water in the patient?
0
For dense bone and areas with high contrast agent, what is the approximate range of CT numbers?
+30 to +3000
How are CT images normalized and truncated for clinical use?
To a range between -1000 and 3095
What does a CT(x,y) number in an image represent?
The Hounsfield unit at that point
How does the CT number in a pixel relate to the attenuation coefficient for that voxel?
They are directly proportional
Which physical property of tissue influences Compton scatter in CT images?
Density
What is the role of the linear attenuation coefficient in forming contrast in medical CT?
It plays a dominant role in forming contrast based on tissue density
What does the window width determine in CT imaging?
The contrast of the image
How are helical CT data sets interpolated to compensate for differences in source paths?
Interpolated into a series of planar image data sets
What is the purpose of Helical CT scanning producing a helical trajectory around the patient?
To reduce patient dose
In CT imaging, how does slice thickness affect the contrast produced from an object?
It produces greater contrast from background when positioned at the center of the CT slice
What is true about detector arrays used in modern CT systems?
They use solid-state scintillator detectors
What is the purpose of the convolution technique in CT image reconstruction?
To remove noise and produce sharper images
Which algorithm is known for providing fine detail in CT images but with increased noise?
Bone algorithm
What does a sharp filter do in CT image reconstruction?
Enhances spatial resolution
How are pixels and voxels related in a CT image?
The pixel width and height are equal to the voxel width and height
Which step precedes the application of the CT reconstruction algorithm in CT image formation?
Preprocessing of raw data
What is the main function of filtered back projection in CT image reconstruction?
To build up the CT image in the computer
Which technique is used to blur raw data during CT image formation?
Convolution technique
Learn about the formation of a CT image through tomographic acquisition, including concepts like projections, views, and fan beam geometry. Gain insight into the process of capturing rays at various projection angles for transmission measurements.
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