ISSN:0091-2751    

DOI:10.1002/jcu.1870010102

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

年代:1973

数据来源: WILEY

ISSN:0091-2751    

DOI:10.1002/jcu.1870010103

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

年代:1973

数据来源: WILEY

摘要:

AbstractExperience with B scan ultrasound in the study of a series of patients admitted to the Johns Hopkins hospital for suspected occult hematomas has been reviewed. Patients included in this report acquired hematomas primarily as the result of medical or surgical therapy. The ultrasonic appearance in most patients is that of a cyst, due to unclotted or homogeneously clotted blood which generates no internal echoes. As soon as fragmentation of the clot occurs, internal echoes are usually found. B scanning was of value in detection, localization and follow‐up of hematomas and was the only diagnostic test used in seven of eleven cases.The advantage of this technique for diagnosis and follow‐up are related to the simplicity of the procedure, its lack of sideeffects and low c

ISSN:0091-2751    

DOI:10.1002/jcu.1870010104

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

年代:1973

数据来源: WILEY

摘要:

AbstractA technique is described for doing the echocardiographic examination with the transducer in the subxiphoid region instead of along the left sternal border (routine examination). This examination has proved to be extremely useful in patients in whom the routine examination was difficult. These patients include those with emphysema and large barrel chests. The examination is most successful in patients whose diaphragms are depressed. In patients whose diaphragms are elevated due to marked obesity, ascites, or distended abdomens this subxiphoid examination may be very difficult. In those patients in whom both routine and subxiphoid examinations were performed the ultrasonic dimensions of the left ventricle were quite comparable with both approaches. However, there were some significant differences in the measurements of the right ventricle with the two examinations. Technically satisfactory examinations of the aorta and left atrium were inconsistent with the subxiphoid approach. Thus the subxiphoid examination was most useful for examining the left ventricle. Since the subxiphoid examination views different areas of the left ventricle, the technique holds promise of providing a means of examining areas of the heart not visualized with the routine approach.

ISSN:0091-2751    

DOI:10.1002/jcu.1870010105

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

年代:1973

数据来源: WILEY

摘要:

AbstractUltrasonography is the preferred technique for placental localization. It permits a comparatively precise estimate of the separation of the lower placental margin and internal cervical os. Six false positive diagnoses of placenta previa occurred in a series of 244 patients. There were no false negative diagnoses. The diagnosis of placenta previa was confirmed as correct in ten patients. Determination of the location of the lower margin of a posterior placenta obscured by the overlying fetus may be assisted by measurement of the separation of the anterior sacral margin and the fetal head when the latter is dipping into the pelvis. A separation of greater than 15 millimeters usually indicates extension of the lower placental margin over the sacral promontory and onto the lower uterine segment.

ISSN:0091-2751    

DOI:10.1002/jcu.1870010106

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

年代:1973

数据来源: WILEY

摘要:

AbstractUltrasound provides anatomical sectional pictures of organs and lesions on the basis of which optimum direction and depth of puncture can be established. The use of a specially designed transducer with a central canal through which the needle is introduced ensures the maintenance of the correct direction during the procedure.A number of areas of applicability are discussed and it is found that as an aid in percutaneous puncture ultrasound has essential advantages when compared to radiology.

ISSN:0091-2751    

DOI:10.1002/jcu.1870010107

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

年代:1973

数据来源: WILEY

摘要:

AbstractB‐scan ultrasonography is being performed with a newly developed hand‐held scanner during retrobulbar tumor surgery. We believe that it is a valuable aid in the localization and the removal of these tumors. The instrument may be directly inserted into the surgical wound, permitting otherwise unobtainable views of the lesion and of the adjacent structu

ISSN:0091-2751    

DOI:10.1002/jcu.1870010108

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

年代:1973

数据来源: WILEY

摘要:

AbstractThis paper presents the principles of a portable compact instrument utilizing a digital control system and providing B‐scan displays. The instrument is designed exclusively for ophthalmic applications. The system is comprised of a self‐contained scanning head and a signal display unit. The entire unit can easily be rolled to the patient's bedside or into the operating room. A programmed pulse generator provides signals for incremental angular positioning of the transducer as well as signals for the formation of the display. The transducer is moved by a stepping motor to establish the incremental sector scan. Display sweeps are generated by digital‐to‐analog conversion to circumvent the use of mechanically‐driven position sensors as used in conventiona

ISSN:0091-2751    

DOI:10.1002/jcu.1870010109

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

年代:1973

数据来源: WILEY

摘要:

AbstractA new, standardized, ultrasound cardiographic technique — CED — is evaluated in four healthy subjects during rest and during graded cycling (supine). The myocardial contraction displacement(s) of an easily recognized area of the posterior wall of the left ventricle was recorded (s(t)‐curves). On line differentiators were developed to differentiate the s(t)‐curves, hereby providing the velocity (V̇ = ds/dt) and acceleration (Ä = d2s/dt2) of contraction. The positive velocity period, here called CED systole, was equal to the left ventricular ejection time at rest. The CED systole amounts to approximately 90% of the auscultatory systole at all levels of activity. The positive peak values of the first and second time derivatives of the s(t)‐curves are located almost constantly relative to the CED — and auscultatory — systolic durations at all exercise levels, confirming that the recordings were obtained from the same epicardial area at all examinations in each subject. The positive, peak velocity (V̇1) is possibly a sensitive estimate of the contractility of the superficial myocardial layer. The size of the CED‐variables were correlated with the steady state work rate of each subject. The CED‐examination was practicable evenduringhe

ISSN:0091-2751    

DOI:10.1002/jcu.1870010110

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

年代:1973

数据来源: WILEY

摘要:

AbstractAfter 36 weeks gestation the placenta has a distinct echographic appearance which is characterized by rounded transonic areas measuring 1.5 to 4.5 cm. in diameter. Anatomic and histologic study of seven placentas with this echographic appearance has snown no abnormalities or characteristic findings. The recognition of the mature placenta is of clinical use in the determination of dysmaturity and growth retardation, where a single fetal head measurement may be misleading. The changes in the internal consistency of the placenta are most easily identified with a real‐time, water bath, linear scanner (Siemens Vidoson) but may also be seen with a compound contact scanner if non‐storage recording is emplo

ISSN:0091-2751    

DOI:10.1002/jcu.1870010111

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

年代:1973

数据来源: WILEY