Download PDF by John G. Webster (Editor) : 34.Medical Imaging

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The DSR and the electron-beam CT scanner reduce the scanning time by an order of magnitude to about onetenth second. Generally, the power of an X-ray source can be a limiting factor. The faster the scanning is, the less the dose delivered, and the more the image noise. A trade-off between temporal resolution and low-contrast resolution depends upon the intended application of CT images. Artifacts Substantial research has been done on causes, characteristics, and correction of image artifacts (43).

Radiol. J. 45: 124– 129, 1994. 38. G. Wang and M. W. Vannier, Longitudinal resolution in volumetric x-ray CT—Analytical comparison between conventional and helical CT, Med. , 21: 429–433, 1994. 39. W. A. Kalender, A. Polacin, and C. Su¨ss, A comparison of conventional and spiral CT: An experimental study on detection of spherical lesions, J. Comput. Assist. Tomogr. 18: 167–176, 1994. 40. G. Wang and M. W. Vannier, Helical CT image noise—Analytical results, Med. , 20: 1635–1640, 1993. 41. G. Wang and M.

The fMRI is a map of the result of subtraction of the MRI before the activation from the MRI obtained by fast imaging methods performed during the activation. The more paramagnetism or deoxyhemoglobin the lower the signal and when one subtracts the MRI image taken before the activation from that taken after the activation the region of activation will appear relatively darker (a negative BOLD signal). , making pictures of the scintillations from crystals), is the technique of making images of the distribution of radioactive compounds.

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34.Medical Imaging by John G. Webster (Editor)

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