摘要:

Many noninvasive imaging methods for evaluating cardiac structure and function are available to cardiologists. MRI, however, is a newcomer on the scene and has not yet established a substantial niche in the day-to-day clinical management of patients or in providing data for basic and clinical research. The article explores the current and potential clinical and investigative applications of MRI and attempts to define the directions in which development should proceed to realize the full potential of this new methodology.

ISSN:0899-3459    

出版商:OVID    

年代:1990

数据来源: OVID

摘要:

Magnetic resonance imaging is extremely well suited to the diagnostic evaluation of the cardiovascular system. Over the past few years, more effective pulse sequences for imaging the heart and blood vessels have been developed, and although clinical use of cardiac MRI remains limited the use of MR angiographic techniques to evaluate major blood vessels is one of the fastest growing clinical applications of MRI today. The article reviews the current indications for vascular MRI with emphasis on those that are increasingly accepted by referring clinicians.

ISSN:0899-3459    

出版商:OVID    

年代:1990

数据来源: OVID

摘要:

The pursuit of capabilities for the evaluation of functional aspects of cardiovascular disease by MRI has resulted in the development and implementation of a number of interesting techniques that can be performed on a conventional scanner. Some currently available techniques emphasize the production of anatomically accurate images representing different phases of the cardiac cycle; others demonstrate physical changes within the acquired data that reflect motion, such as blood flow. Magnitude data from spin-echo and gradient-echo sequences can be used to produce dynamic images of the cardiovascular system. Phase data can be used to generate flow-based images reflecting the movement of blood protons. These techniques can be applied in the evaluation of ventricular function, valve function, or functional abnormalities in either congenital cardiovascular disease or great artery disease.

ISSN:0899-3459    

出版商:OVID    

年代:1990

数据来源: OVID

摘要:

MRI has assumed an important role in the noninvasive evaluation of patients with congenital cardiac lesions. In this article, the authors examine basic technical considerations, an approach to analysis of MR images in congenital heart disease patients, and review major applications of MRI as they apply to patients with congenital heart disease.

ISSN:0899-3459    

出版商:OVID    

年代:1990

数据来源: OVID

摘要:

Three-dimensional surface reconstruction images of the heart and great vessels can be produced from contiguous sequences of ECG-triggered MR scans in patients with congenital heart disease. The methods allow separation of the epi- and endocardial surfaces and definition of the enclosed blood volumes on a slice-by-slice basis. Surface reconstruction images have value in communicating the results of MR examinations to clinicians in cases where cardiac morphology is unusually complex; in depicting intracardiac defects, size, and location; and in aiding the study of pulmonary venous drainage. This method can be practical in studying cardiac morphologic abnormalities and especially in planning cardiac surgery.

ISSN:0899-3459    

出版商:OVID    

年代:1990

数据来源: OVID

摘要:

Cardiac MRI is poised for a major change: Recent development of echoplanar imaging, or “instant” scanning, offers the possibility of studying myocardial perfusion with contrast agents. Moreover, newer contrast agents are being developed to study various aspects of myocardial function. Techniques of MR angiography have progressed: Noninvasive coronary angiography for detecting asymptomatic atherosclerosis of at least the proximal region of the coronary arteries appears possible in the near future. MRI has also been used to solve a long-standing problem in cardiac imaging: the absence of point-to-point correspondence in tomographic images of the heart from diastole to systole. Through tissue tagging, MRI offers the unique possibility of noninvasively assessing local and regional ventricular deformation more accurately than any other method available today.

ISSN:0899-3459    

出版商:OVID    

年代:1990

数据来源: OVID

ISSN:0899-3459    

出版商:OVID    

年代:1990

数据来源: OVID

ISSN:0899-3459    

出版商:OVID    

年代:1990

数据来源: OVID