ISSN:0883-5993    

出版商:OVID    

年代:2000

数据来源: OVID

摘要:

Comprehensive cardiac assessment embraces virtually every imaging modality and includes information about coronary vascular anatomy as well as cardiac morphology, function, perfusion, metabolism, and tissue characterization. Through sophisticated computer processing and image analysis, newer imaging technologies such as computed tomography (CT), magnetic resonance (MR), MR spectroscopy, and positron emission tomography now provide quantitative information that may obviate more invasive angiographic assessment. Currently, no single imaging technology realizes all questions relating to cardiac form and function, and many of the technologies overlap in the content and quality of information they provide. This overview seeks to provide a broad perspective on current cardiac imaging, articulating the benefits of various technologies and their limitations.

ISSN:0883-5993    

出版商:OVID    

年代:2000

数据来源: OVID

摘要:

The cardiac silhouette as seen on a routine chest film contains considerable information regarding the presence of heart disease, the nature and severity of the disease, and its prognosis. The changes that are seen directly reflect the altered anatomy and physiology of the heart. Appreciation of these factors allows for a reasonable, logical approach to interpretation of the cardiac silhouette.

ISSN:0883-5993    

出版商:OVID    

年代:2000

数据来源: OVID

摘要:

A complete cardiac study requires both anatomic and physiologic evaluation. Cardiac function can be evaluated noninvasively by magnetic resonance imaging (MRI)or ultrafast computed tomography (CT). MRI allows for evaluation of cardiac function by cine gradient echo imaging of the ventricles and flow analysis across cardiac valves and the great vessels. Cine gradient echo imaging is useful for evaluation of cardiac wall motion, ventricular volumes and ventricular mass. Flow analysis allows for measurement of velocity and flow during the cardiac cycle that reflects cardiac function. Ultrafast CT allows for measurement of cardiac indices similar to that provided by gradient echo imaging of the ventricles.

ISSN:0883-5993    

出版商:OVID    

年代:2000

数据来源: OVID

摘要:

Although computed tomographic (CT) and magnetic resonance (MR) evaluation of patients with valvular heart disease is almost never performed as a first line of diagnostic intervention, their performance does provide important morphologic and physiologic information concerning the etiology and the current status of the valvular dysfunction. Evaluation of chamber and great artery size as well as ventricular wall thickness provide the basis for diagnosing and analyzing severity of valvular heart disease. Furthermore, additional findings, including calcification and evidence of interstitial pulmonary edema, increase diagnostic sensitivity and confidence in diagnosis. MR examination has the advantage over CT of providing direct demonstration of the signal void jets of dysfunctional valves, as well as a means of quantitating regional and global ventricular function and severity of valvular pressure gradients.

ISSN:0883-5993    

出版商:OVID    

年代:2000

数据来源: OVID

摘要:

Magnetic resonance imaging (MRI) and computed tomography (CT) are important imaging modalities for the noninvasive characterization of cardiac and para-cardiac masses. They are, in general, superior to other modalities (e.g., echocardiography) in their ability to delineate the exact location and the extent of the lesion and to demonstrate the effects of the lesion on surrounding structures. MRI and CT may also be helpful in suggesting a specific diagnosis, because some tumors have rather characteristic locations and appearances. In addition, both modalities can be extremely helpful in both treatment planning and posttreatment follow-up because they are noninvasive, reproducible, and enable detection of residual or recurrent mass.

ISSN:0883-5993    

出版商:OVID    

年代:2000

数据来源: OVID

摘要:

The evaluation of a patient with a heart murmur and congenital heart disease is diagnostically very challenging. Multiple advanced techniques aid in the diagnosis of simple and complex malformations. Interventional procedures and surgical corrections have allowed most patients to enjoy a good and productive lifestyle.

ISSN:0883-5993    

出版商:OVID    

年代:2000

数据来源: OVID

ISSN:0883-5993    

出版商:OVID    

年代:2000

数据来源: OVID

摘要:

In patients with pulmonary sarcoidosis, air trapping as evidenced by expiratory high-resolution computed tomography (HRCT) is not specific for a given stage of disease. Air trapping can occur at the level of the secondary lobule, as well as in distributions suggesting sublobular, subsegmental, and segmental involvement. While air trapping can be a nonspecific finding, it is a common feature in patients with pulmonary sarcoidosis and is a supportive diagnostic finding.

ISSN:0883-5993    

出版商:OVID    

年代:2000

数据来源: OVID

摘要:

Sarcomas of the major arteries are rare tumors often misdiagnosed due to nonspecific symptomatology. The authors present three cases of pulmonary artery and aortic sarcomas that were initially believed to be more common diseases. Modern imaging techniques including helical computed tomography (CT) and magnetic resonance imaging (MRI) are increasing the frequency of premortem diagnosis of these entities and aided surgical planning.

ISSN:0883-5993    

出版商:OVID    

年代:2000

数据来源: OVID