ISSN:0091-2751    

DOI:10.1002/jcu.1870030202

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

年代:1975

数据来源: WILEY

ISSN:0091-2751    

DOI:10.1002/jcu.1870030203

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

年代:1975

数据来源: WILEY

摘要:

AbstractWhile superficial masses are usually apparent and easily palpated, it is sometimes difficult to determine whether they are cystic, solid, or mixed. Ultrasound was used to evaluate superficial masses determining their size, relationship to other structures and internal characteristics. In a series of 34 patients, ultrasound was able to differentiate among cystic, solid, or complex masses with a 94% accuracy.

ISSN:0091-2751    

DOI:10.1002/jcu.1870030204

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

年代:1975

数据来源: WILEY

摘要:

AbstractUltrasonic studies were performed on normal fetuses ranging from 36 to 40 weeks gestational age in an attempt to visualize anatomical details of the fetal heart. We were able to visualize cardiac structures hitherto thought to be unidentifiable. Two‐dimensional B‐scan exposures of sections showed transverse and longitudinal sections of the fetal heart, including the cardiac septa and inlet and outlet sites of the large vessels. To attempt to elucidate the dynamics of the fetal heart, the motility patterns of the cardiac structures were examined by time‐motion mode scanning and the patterns obtained were compared to those observed in the postnatal heart. The reliability of the theories advanced and the further prospects are disc

ISSN:0091-2751    

DOI:10.1002/jcu.1870030205

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

年代:1975

数据来源: WILEY

摘要:

AbstractIn the course of doing routine echocardiograms on patients with mitral prosthetic valves, we observed peculiar intracavitary echoes within the left ventricle. Of the 36 valves studied in 31 different patients, 14 echocardiograms demonstrated the abnormal intracavitary echoes and 22 did not. The presence of mitral insufficiency, atrial fibrillation, systemic emboli and warfarin sodium (Coumadin) therapy were roughly equal in the two groups. A higher percentage of abnormal intracavitary echoes occurred in patients with a hemoglobin less than 11 gm/100 ml, other prosthetic valves, cloth covered valves, low platelets, and functional class III–IV. Although this study does not clarify the origin of these abnormal echoes, it is possible that they originate from particulate matter such as tiny fibrin clots or fibers from the cloth covering of the valv

ISSN:0091-2751    

DOI:10.1002/jcu.1870030206

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

年代:1975

数据来源: WILEY

摘要:

AbstractThirty‐three patients with mitral valve prostheses were studied with echocardiography in an effort to determine if this technique could be useful in detecting significant abnormalities. Recordings were obtained in the supine position with the transducer directed to record maximum excursion of the prosthesis. Echoes from the struts, poppet and sewing ring were readily recorded. Amplitude of excursion and opening and closing velocities of the poppet were measured. Fifty echocardiographic recordings were obtained from the 33 patients. Of the 33 patients studied, 22 were thought to have “normal” echo tracings while in 11, the tracings were considered “abnormal.” Apparent abnormalities consisted of: 1) abnormal diastolic separation between the poppet and strut, 2) increased echoes near the poppet, strut or sewing ring and 3) a combination of both. There was only one instance of suspected “sticking” of the prosthesis. All patients who had “abnormal” studies except one developed complications associated with their prosthesis (90%) compared to only 36% in patients with “normal” tracings. Five patients in each group died. Autopsy studies are described and correlations with the echocardiographic findings are made. In low profile valves reduction in excursion of the disc may be an indication of malfunction. Echocardiography appears to be of value in the assessment of function of mi

ISSN:0091-2751    

DOI:10.1002/jcu.1870030207

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

年代:1975

数据来源: WILEY

摘要:

AbstractGray scale ultrasound has proved to be a simple, rapid, and reliable means for the investigation of cholestatic jaundice. The distended biliary tree has a characteristic but sometimes confusing appearance on ultrasonic tomography. Gray scale ultrasound can diagnose portal hypertension by visualizing an enlarged, tortuous portal vein. This can be differentiated from the typical shape of the dilated common bile duct by the condition of the intrahepatic biliary canaliculi and by examination of the spleen.

ISSN:0091-2751    

DOI:10.1002/jcu.1870030208

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

年代:1975

数据来源: WILEY

摘要:

AbstractAn ultrasound receiver with programmable time gain control (TGC) has been developed. The TCG curve is synthesized from sequentially gated analog switches, each of which controls receiver gain over a range of lcmDiagnostic studies using a receiver with the programmable TGC curve show improved results in the amplitude equalization of received echoes and in the output display.

ISSN:0091-2751    

DOI:10.1002/jcu.1870030209

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

年代:1975

数据来源: WILEY

摘要:

AbstractA new ultrasonic deflector for aspiration and biopsy is described. It is made of a Plexiglas prism (45°) with an oblique hole (27°). The ultrasonic beam is bent in water by about 23°. A puncture needle inserted through the prism hole passes through the ultrasonic beam in water with only minimal deviation from the beam axis. A fairly strong echo from the needle tip is a useful indicator for positioning the needle for aspiration. The resolution of the ultrasonic scan is not significantly affected by the deflector. This inexpensive ultrasonic deflector is capable of performing the functions offered by the expensive ultrasonic aspiration‐biopsy transd

ISSN:0091-2751    

DOI:10.1002/jcu.1870030210

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

年代:1975

数据来源: WILEY

摘要:

AbstractA gray scale hard copy unit has been adapted to an ultrasound B‐scanner equipped with a video gray scale system and a conventional hard copier and a Polaroid camera. Comparative recordings were made of all three methods. The new hard copy unit produced a better gray scale image than Polaroid film, with reduction of cost and elimination of the problems inherent in Polaroid fil

ISSN:0091-2751    

DOI:10.1002/jcu.1870030211

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

年代:1975

数据来源: WILEY