ISSN:0091-2751    

DOI:10.1002/jcu.1870120502

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1984

数据来源: WILEY

ISSN:0091-2751    

DOI:10.1002/jcu.1870120503

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1984

数据来源: WILEY

摘要:

AbstractThe sonographic appearance of 37 renal cell carcinomas was reviewed with particular emphasis on the relationship between the echo pattern of tumor and tumor size. Small carcinomas tended to be solid and hypoechoic; seven lesions less than 5 cm in the largest dimension were either hypo‐ or isoechoic. The echogenicity level of the solid parts within the lesion, whether it was solid or mixed, tended to increase as the tumor grew. It is important to recognize that the sonographic appearance of renal cell carcinomas varies with the size of the tumo

ISSN:0091-2751    

DOI:10.1002/jcu.1870120504

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1984

数据来源: WILEY

摘要:

AbstractThe efficacy of four current quality assurance performance tests in diagnostic ultrasound was investigated. This was done by comparing the ability of the performance tests to detect fluctuations in gray scale, depth of penetration, axial resolution and lateral resolution on a real‐time scanner with the ability of sonologists and sonographers to detect the same fluctuations. The performance tests for gray scale, depth of penetration, and axial resolution were found to be efficacious. The lateral resolution test was judged nonefficacious. This suggested a need to revise the protocol for the lateral resolution test with regard to real‐time scann

ISSN:0091-2751    

DOI:10.1002/jcu.1870120505

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1984

数据来源: WILEY

摘要:

AbstractReal‐time ultrasound studies of the head were performed on 96 infants weighing 1500 g or less. This population represented all such infants admitted within the first 72 hours of life to a neonatal intensive care unit over a 9‐month period. Intracranial subependymal/intraventricular hemorrhage occurred in 22 (23%) of the infants. Of these 13 (59%) developed ventricular enlargement. Four other infants, in whom hemorrhage was not identified, also developed ventricular enlargement. When it occurred, the ventricular enlargement developed within 2 weeks of the hemorrhage in 77% of cases. It reached its maximum size within 2 weeks in 65% of cases. In 9 of 16 cases the maximal ventricular enlargement was categorized as mild. Spontaneous arrest or resolution of the ventriculomegaly occurred in all but two cases, who required shunting. Clot resolution was slow. It was complete at 3 weeks in only 5 of 18 ca

ISSN:0091-2751    

DOI:10.1002/jcu.1870120506

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1984

数据来源: WILEY

摘要:

AbstractThe time interval between mitral and tricuspid valve closure was measured from M‐mode echocardiograms in patients with Ebstein's anomaly. It was found that this time interval demonstrated a range of values within each patient. In the present study we assessed the parameters which influenced the variability. The use of different transducer positions on the chest wall was found to be the predominant factor. There was no correlation between the measured time interval, its variability, and the moment of measurement during breathing. However, a period of breathholding significantly reduced the variability. This study indicates that a wide range of time intervals might be measured in a single patient. We conclude therefore, that this parameter should be used with great care in the diagnosis of Ebstein's anomal

ISSN:0091-2751    

DOI:10.1002/jcu.1870120507

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1984

数据来源: WILEY

摘要:

AbstractThe aim of this study was to define sonographic patterns of expanding parotid lesions. Over a 2‐year period, 39 parotid gland masses were examined. Grayscale sonography with a static scanner using high frequency transducers (5 and 7.5 MHz) provided refined visualization of the normal structure of the gland and the space‐occupying mass. There are different sonographic patterns for different types of mass. Lesion malignancy should always be suspected when there is a clearly echogenic mass, especially one with an irregular distribution of the echoes, posterior attenuation, and rough margins (these sonographic features are of no value for lymphomas). All benign lesions have regular margins and are sonolucent at normal gain settings. It is possible to obtain a characteristic sonographic pattern for each specific benign lesion by varying the g

ISSN:0091-2751    

DOI:10.1002/jcu.1870120508

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1984

数据来源: WILEY

摘要:

AbstractThe ultrasound image of gas‐containing gallstones was evaluated in three cases. In two, the stones were studied in vitro in a phantom gallbladder by ultrasound, and then by microradiographic techniques. The third case was investigated in vivo by ultrasound and computerized tomography (CT). The presence of gas‐containing fissures, which are not detectable on ultrasound, was demonstrated. In contrast, wider fissures, or a true gas bubble, produce reverberation echoes which depend upon the quantity of gas present within the gallst

ISSN:0091-2751    

DOI:10.1002/jcu.1870120509

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1984

数据来源: WILEY

ISSN:0091-2751    

DOI:10.1002/jcu.1870120510

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1984

数据来源: WILEY

ISSN:0091-2751    

DOI:10.1002/jcu.1870120511

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1984

数据来源: WILEY