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What is the purpose of image interpolation in CT scanning?
What type of motion does the continuous tube and table motion exhibit?
What is the problem with using conventional reconstruction algorithms with helical CT scanning?
What is the shape of the trajectory of the X-ray source in helical CT scanning?
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What is the purpose of interpolating the helical data set?
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What is interpolation essentially?
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Study Notes
Image Interpolation in CT Scanning
- Image interpolation is used to create a number of new slices between known slices to obtain an isotropic volume image.
- In helical CT scanning, the x-ray source travels in a helical trajectory around the patient, resulting in a data set that is not suitable for conventional reconstruction algorithms.
- The helical motion of the x-ray source means that projections do not lie in a single plane, making it difficult to reconstruct the image.
- To overcome this limitation, the helical data set is interpolated into a series of planar image data sets before CT reconstruction.
- Interpolation is a weighted average of the data from either side of the reconstruction plane, with different weighting factors used for each projection angle.
- The goal of interpolation is to create a data set that assumes the x-ray source has negotiated a circular path around the patient, which is required for present-day CT reconstruction algorithms.
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Description
Learn about the challenges of helical CT scanning and how image interpolation is used to obtain isotropic volume images. Understand the limitations of conventional reconstruction algorithms and how they are overcome.
