ISSN:0001-6101    

DOI:10.1111/j.0954-6820.1979.tb01084.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

SUMMARYUntil recently M‐mode echocardiography has been the standard in clinical practice. Although the M‐mode systems provide rapidly acquired, high resolution data concerning regional cardiac interface position and motion, the limited area encompassed by the narrow M‐mode beam and failure to provide spatial orientation may be a significant limitation in selected clinical areas.Cross‐sectional echocardiography expands the area of the heart which is available for study and displays the acoustic images in a dynamic spatially oriented format allowing the moving cross‐sectional anatomy of the heart to be visualized. This variation in method of display provides more extensive information concerning valvular heart disease by permitting analysis of the morphology and motion patterns of the cardiac valves, direct visualization of valvular orifices, and appreciation of valvular movement in relationship to surrounding cardiac chambers. In patients with ischemic heart disease the cross‐sectional systems increase the area of the ventricle which is available for ultrasonic study by adding the cardiac apex and the medial and lateral walls of the ventricle to the recorded data. In addition the systems permit localized distortion in left ventricular shape and function to be evaluated. Finally, in congenital heart disease the cross‐sectional systems permit the orientation of the great vessels and cardiac chambers to be determined. In this report we have presented examples of the applications of cross‐sectional echocardiography in each of these areas in the hope that the reader can gain from these isolated examples an overall appreciation of the potential of this type of instrumentation and its relationship to be more conventional

ISSN:0001-6101    

DOI:10.1111/j.0954-6820.1979.tb01085.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

ISSN:0001-6101    

DOI:10.1111/j.0954-6820.1979.tb01086.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

ABSTRACTA discussion on Ultrasound Fluoroscopy and how it relates to the traditional Real Time Instrumentation.This paper covers the various types of Ultrasound Fluoroscopy Instrumentation, a few of the advantages and disadvantages of each and Unirad Corporation's approach to Ultrasound Fluoroscopy. Also detailed discussions on the technical differences between their approach and the traditional Real Time Instrumentation itemizing electronic beam resolution control in some detail as to its advantages, complexity and comparison to Real Time (Non‐focused) and the traditional single element Ultrasound Instrument

ISSN:0001-6101    

DOI:10.1111/j.0954-6820.1979.tb01087.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

ABSTRACTProper clinical use of real‐time, two‐dimensional echocardiography depends upon three major factors: the clinical questions posed of these imaging devices, the interrelationship of this technique with other imaging techniques and the quality of the ultrasonic image. The Duke experience with this technique has been primarily based on results obtained with a focused, phased array imaging system over the last three years. During this period of time we have observed that high‐resolution, cross‐sectional ultrasonic images of cardiac structures provide unique diagnostic information that is not possible by any other method. Similarly, this type of information allows the clinician to pose new questions concerning the use of diagnostic ultrasound in patient care. Improvements in image quality that have accompanied the addition of new scan formats and a broad‐band transducer have enhanced the clinical reliability of diagnostic in

ISSN:0001-6101    

DOI:10.1111/j.0954-6820.1979.tb01088.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

ISSN:0001-6101    

DOI:10.1111/j.0954-6820.1979.tb01089.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

SUMMARYIn echocardiographic recordings optimal amplification and A‐mode control should be used. In wall motion analysis greater accuracy is obtained by utilization of enlarged display scale. When these technical aspects are taken into consideration accurate and reproducible recordings are obtaine

ISSN:0001-6101    

DOI:10.1111/j.0954-6820.1979.tb01090.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

ISSN:0001-6101    

DOI:10.1111/j.0954-6820.1979.tb01091.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

ABSTRACTEchocardiography represents an established noninvasive technique to evaluate left ventricular (LV) performance. The LV ejection phase indices may be divided into three categories: (1) volume‐dependent, (2) circumferential, and (3) wall thickening. Since the latter two are not volume dependent, they are clinically more useful in patients with dilated left ventricles. These parameters have limited clinical value in the presence of left‐sided volume overload conditions (e g, mitral regurgitation and aortic regurgitation) since significant LV dysfunction may exist in the presence of normal ejection phase indices by echo. The echocardiogram is also a sensitive procedure to detect subtle alterations in LV function following acute or chronic interventions with various types of vasoactive and inotropic dr

ISSN:0001-6101    

DOI:10.1111/j.0954-6820.1979.tb01092.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

ISSN:0001-6101    

DOI:10.1111/j.0954-6820.1979.tb01093.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY