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CT Image Formation
Study Questions
| Question | Answer |
|---|---|
| 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
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