Computed Tomography (CT)

What are Multiplanar Reformations (MPR's)?

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"Multiplanar reformations (MPR's) are two-dimensional reformatted images that are reconstructed secondarily in arbitrary planes from the stack of axial image data." (Prokop and Galanski, 2003)

2003 Prokop, M., and M. Galanski. Spiral and Multislice Computed Tomography of the Body, A. J. van der Molen, and C. M. Schaefer-Prokop (eds.), Thieme, New York, pp. 1-1090.

What is Volume Rendering Technique (VRT)?

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"VRT assigns a range of opacity values to CT numbers and thus yields a better definition of object contours or semitransparent display of structures." (Prokop and Galanski, 2003)

2003 Prokop, M., and M. Galanski. Spiral and Multislice Computed Tomography of the Body, A. J. van der Molen, and C. M. Schaefer-Prokop (eds.), Thieme, New York, pp. 1-1090.

What is a Maximum/Minimum Intensity Projection (MIP/MinIP)?

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"Maximum intensity projection (MIP) and minimum intensity projection (MinIP) are volume-rendering techniques in which suitable editing methods are used to define the volume of interest (VOI). All of the CT image data set may be used, or the volume may be confined to a region of interest (ROI). In the most difficult case, only selected organ systems are included or excluded from VOI.

What is a Shaded Surface Display (SSD)?

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"A shaded surface display (SSD) is a surface-rendered image that provides a realistically looking three-dimensional view of the surface of a structure of interest within the acquired volume set." (Prokop and Galanski, 2003)

2003 Prokop, M., and M. Galanski. Spiral and Multislice Computed Tomography of the Body, A. J. van der Molen, and C. M. Schaefer-Prokop (eds.), Thieme, New York, pp. 1-1090.

What is in situ?

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"In position, not extending beyond the focus or level of origin." (PDR, Pugh et al. (eds.), 2000)

2000 Physicians Desktop Reference (PDR) Medical Dictionary, N.B. Pugh, B. Werner, T. W. Filardo, P. W. Binns, L. G. Francis, R. Lukens, B. Montgomery, B. L. Ferretti, K. J. Cradle, D. Workman (eds.), Lippincott Williams & Wilkens, Second Edition, pp. 1-2098.

What is a micron?

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A micron is a unit of measurement equal to one millionth of one meter.

What is DICOM?

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"Abbreviation for Digital Imaging and Communications in Medicine, a joint standard of the American College of Radiology and National Equipment Manufacturers Association; specifies entities (or objects) and functions (or services) to allow communication between various image sources and other computer devices, such as archives or workstations." (PDR, Pugh et al. (eds.), 2000)

What is a pixel, a voxel, a matrix?

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"A CT image is composed of a square image matrix that ranges in size from 256 X 256 to 1024 X 1024 picture elements or pixels. Since a CT section has a finite thickness, each pixel actually represents a small volume element, or voxel. The size of this voxel depends on the matrix size, the selected field of view (FOV), and the section thickness." (Prokop and Galanski, 2003)

2003 Prokop, M., and M. Galanski. Spiral and Multislice Computed Tomography of the Body, A. J. van der Molen, and C. M. Schaefer-Prokop (eds.), Thieme, New York, pp. 1-1090.

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