Magnetic resonance imaging
著者
書誌事項
Magnetic resonance imaging
（Topics in current chemistry = Fortschritte der chemischen Forschung, 221 . Contrast agents ; 1）
Springer-Verlag, c2002
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注記
"Author index, v. 201-221": p. [237]-243
Includes bibliographical references and index
内容説明・目次
内容説明
Extracellular MRI and X-ray contrast agents are characterized by their phar- cokinetic behaviour.After intravascular injection their plasma-level time curve is characeterized by two phases. The agents are rapidly distributed between plasma and interstitial spaces followed by renal elimination with a terminal half-live of approximatly 1-2 hours. They are excreted via the kidneys in unchanged form by glomerular filtration. Extracellular water-soluble contrast agents to be applied for X-ray imaging were introduced into clinical practice in 1923. Since that time they have proved to be most valuable tools in diagnostics.They contain iodine as the element of choice with a sufficiently high atomic weight difference to organic tissue. As positive contrast agents their attenuation of radiation is higher compared with the attenuation of the surrounding tissue. By this contrast enhancement X-ray diagnostics could be improved dramatically. In 2,4,6-triiodobenzoic acid derivatives iodine is firmly bound. Nowadays diamides of the 2,4,6-triiodo-5-acylamino-isophthalic acid like iopromide (Ultravist, Fig. 1) are used as non-ionic (neutral) X-ray contrast agents in most cases [1].
目次
Extracellular MRI Contrast Agents Based on Gadolinium.- Structures of MRI Contrast Agents in Solution.- Relaxivity of MRI Contrast Agents.- Kinetic Stabilities of Gadolinium(III) Chelates Used as MRI Contrast Agents.- New Classes of MRI Contrast Agents.- Non-Gadolinium-Based MRI Contrast Agents.- Blood-Pool MRI Contrast Agents: Properties and Characterization.
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