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CT Image Formation

Study Questions

QuestionAnswer
What does the display hardware do? it assigns a specific gray level to the region of a CT image from which the attenuation information was detected
Which scanning method entails the x-ray tube rotating around the patient while patient table remains stationary? conventional, or serial, CT
What is another name for helical or spiral CT? volumetric CT
What scanning method is the “Gold Standard” for CT image quality? conventional or serial scanning
A _____ allows for continuous data collection during continuous patient movement through the gantry. helical scan
The thickness of the x-ray beam in a helical study is determined by the _____. pre-patient collimation
Most CT systems today use a reconstruction method called ____. filtered back projection
What do we call the filter that is applied to the raw data during image reconstruction? reconstruction filter or kernel
What is the process of applying a filter to the raw data called? convolution
What is the purpose of a reconstruction filter, or kernel? to enhance the important characteristics of the image before back projection is performed
What are the two basic types of reconstruction filters? sharp and smooth
What does a sharp reconstruction filter do? it improves the definition of the edges of structures but it does not minimize the grainy or speckled appearance in the image.
What does a smooth reconstruction filter do? it minimizes the grainy appearance of noise in the image so that the contrast between tissues can be better distinguished, but is does not improve upon the edge definition.
What do we call the attenuation information collected at each projection? attenuation profiles
If standard filtered back projection is applied to a cone beam, this results in an artifact known as ___: cone beam artifact
What is the limit to the number of slices collected in a single rotation is you are going to be using filtered back projection to reconstruct the images? 4 slices
To make sure that the reconstructed MPR images are diagnostic, it is important that the original slices do what? have no gaps between them
What do we call slices with no gaps between them? contiguous
What type of imaging technique should be used when post processing is required? helical imaging
Using ____ in the initial data set improves the quality of the reconstructed images. overlapped
When are the most accurate MIP results obtained? when a small volume of interest is selected
Created by: sspatel