By Priv.-Doz. Dr. med. Claus Claussen, Dr. med. Bernd Lochner (auth.)
The authors current their adventure in additional than seven years of dynamic computed tomography in scientific perform. Time density curves and attribute examples in particular areas of curiosity increase the presentation. Dynamic computed tomography makes an enormous contribu tion to the analysis and review of a pathologic technique: the demonstration of the dynamics of blood stream in the lesion and surrounding basic tissue. on account that either the lesion itself and adjoining common tissue exhibit attribute findings in every one circulatory part, the research presents a large number of info at the circulation of blood and distinction fabric which facilitate either popularity and diiferentation of a lesion. past due experiences following management of a distinction agent let an estimate of the passage of the distinction medium to the inter stitium, that is of diagnostic value. Chapters facing particular medical entities additionally comprise priceless details at the most suitable technique of distinction agent management (bolus injection or infusion) in addition to a dialogue of symptoms for the technique. Dynamic computed tomography represents an important increase over traditional computed tomography in a few occasions, and this indicates a huge contri bution to the diagnostic functions of the medical radiologist. The authors are to be counseled for the truth that they've got basically outlined the boundaries of dynamic computed tomography. i'm hoping that the 1st English language version, following the appea rance of the German model in 1983, could be good received.
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Additional info for Dynamic Computed Tomography: Basic Principles and Clinical Applications
Therefore contrast material in the vascular bed is of primary importance for dynamic CT studies; since the contrast enhancement within the first minute is related to dilution and distribution of contrast material in the blood vessels, although there may be significant passage of contrast material from the vessels to the interstitial space in highly vascular organs. This phenomenon may be observed during the passage of a contrast agent through the lungs. Distribution of contrast material between the vascular bed and the interstitial space is complete after approximately 60 s; the subsequent decline in density values within soft tissue structures is determined by the amount of contrast medium in the interstitial space of these organs.
Thinning of the myocardium has been demonstrated even in very small infarctions. In vitro studies have shown a linear correlation between the volume of infarcted tissue determined by CT studies and the actual extent of myocardial infarction. 41 Calculated values for infarction averaged up to 27% less than the actual values. The reason for this discrepancy might be the partial volume effect, since healthy tissue at the margins of the infarcted area may be included in an 8-mm slice. Another source of error may lie in the fact that cross-sectional slices are not always made at exactly 90° to the long axis of the heart.
3 atm. Solutions with the same osmotic pressure as plasma are designated isotonic solutions. The resistance of the semipermeable cell membrane to the passage of many substances is so great that changes in osmotic pressure in the extracellular fluid may be followed by considerable transfers of water between the cell and the surrounding extracellular space. Low osmotic pressure in the extracellular space results in movement of water into the cell, with swelling of the latter and an increase in the volume of the intracellular compartment, which may ultimately result in destruction of the cell membrane.
Dynamic Computed Tomography: Basic Principles and Clinical Applications by Priv.-Doz. Dr. med. Claus Claussen, Dr. med. Bernd Lochner (auth.)