MRIs

Koenig S H and Brown R D 1990 Field-cycling relaxometry of protein solutions and tissue— implications for MRI Prog. Nucl. Magn. Reson. Spectrosc. 22 487-567... 

The great diversity of applications of magnetic resonance imaging (MRI) has resulted in a plethora of teclnhques which at first sight can seem bemusmg. However, at heart they are built on a series of connnon... 

Liquid helium s use in magnetic resonance imaging (MRI) continues to increase as the medical profession accepts and develops new uses for the equipment. This equipment has eliminated some need for exploratory surgery by accurately diagnosing patients. Another medical application uses MRE to determine (by blood analysis) whether a patient has any form of cancer. 

Although the technology of an MRI scanner is rather sophisticated it does what we have seen other NMR spectrometers do it detects protons Thus MRI IS especially sensitive to biological materials such as... 

Using MRI as a substitute for X ray tomography IS only the first of what are many medical applica tions More he on the horizon If for example the rate of data acquisition could be increased then it would become possible to make the leap from the equivalent of still photographs to motion pictures One could watch the inside of the body as it works— see the heart beat see the lungs expand and con tract—rather than merely examine the structure of an organ... 

Magnetic resonance imaging (MRI) (Section 13 13) A diag nostic method in medicine in which tissues are examined by NMR... 

Future Applications. The use of gadolinium complexes as contrast agents in magnetic resonance imaging (mri) is growing (40). 

Mag netic Resonance Magnetic resonance imaging (MRI) is a tomographic imaging modaHty. The basis of MRI, equation 6,... 

A problematic artifact associated with MRI arises when the imaged subject moves duriag acquisition of the / -space data. Such motion may result ia a discontiauity ia the frequency-encoded or phase-encoding direction data of / -space. When Fourier transformed, such a discontiauity causes a blurred band across the image corresponding to the object that moved. Such an artifact ia an image is referred to as a motion artifact. 

The goal of the MRI scientist is to maximize the contrast-to-noise ratio between tissues. Examination of equation 13 reveals that by varyiag TR and TE, the clinician has a tremendous amount of flexibiHty to select the desired contrast between two tissues. 

The resolution of the y-camera is determined by both the collimator and the crystal/photomultipher tube combination. In general, the resolution is significantly poorer than that of other modaUties such as magnetic resonance imaging (mri) and x-ray computerized tomography (ct). For single-photon... 

Sucralfate [54182-58-0] an aluminum salt of sucrose octasulfate, is used as an antacid and antiulcer medication (59). Bis- and tris-platinum complexes of sucrose show promise as antitumor agents (60). Sucrose monoesters are used in some pharmaceutical preparations (21). A sucrose polyester is under evaluation as a contrast agent for magnetic resonance imaging (mri) (61). Oral adrninistration of this substance opacifies the gastrointestinal tract and eliminates the need for purging prior to mri. 

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