The use of ultrasound for various diagnostic techniques in medicine continues to increase in popularity and complexity. It seems possible that the prediction of the National Science Foun­ dation that ultrasonic techniques may be used as frequently as X-ray techniques by the end of the decade may indeed be fulfilled. The annual scientific meeting of the American Institute of Ultra­ sound in Medicine is the only meeting held regularly on the North American continent and devoted solely to the diagnostic use of ultrasound. Under these circumstances it is not surprising to find that both the attendance at these meetings and the number of papers submitted for presentation, are increasing markedly each year. The papers presented at these meetings probably reflect the "state-of-the-Art" reasonably accurately. The Proceedings of these annual meetings are therefore a valuable record of the current state of ultrasonic diagnostic techniques in the U.S.A. Even though it is not possible to print in extenso every paper presented at the meeting, an attempt has been made with this volume, by increasing the length of the papers printed in abstract form, to enable the reader to obtain an overall view of current developments and research on this continent in all fields of ultrasonic medical diagnostic technology. Speed of publication is essential if this volume is to contain current information.

Cardiology.- Echocardiography of the Inter-Atrial Septum.- Echocardiographic Recognition of Intra-Atrial Baffle Dysfunction.- Usefulness of Echocardiographic Peak Velocity of Circumferential Fibre Shortening.- Myocardial Contractility in Normal and Post Infarction Subjects at Rest and During Isometric Exercise.- Echocardiographic Observations on Systolic Closure of the Aortic Valve in Mitral Incompetence.- Hypertension in Adolescents - An Ultrasound Study.- Two-Dimensional Echocardiographic Assessment of Normal Mitral Leaflet Motion*.- Quantitative Echocardiography: A Study of Champion Childhood Athletes*.- The Echocardiographic Spectrum of Mitral Valve (MV) Motion in Children With and Without Mitral Valve Prolapse (MVP)*.- Cross-Sectional Echocardiographic Assessment of Severity of Aortic Stenosis in Children*.- Echocardiographic Observations Regarding Pulmonary Valve Motion in Children With Pulmonary Vascular Obstructive Disease*.- Echocardiographic Features of Common Ventricle*.- Detection of Intracardiac Right to Left Shunting by Echocardiography*.- The Utility and Validity of Suprasternal Notch (SSN) Echocardiography in Congenital Heart Disease (CHD)*.- Correlation of Diagnostic Echographic Features of Mitral Stenosis with Findings at Catheterization and Surgery*.- The Effect of Transducer Placement on the Echocardiographic Pattern of Mitral Valve Prolapse*.- Cross-Sectional Echocardiography in Evaluation of Patients with Discrete Subvalvular Aortic Stenosis*.- The Comparative Utilities of Real Time Cross-Sectional Echocardiographic Imaging Systems in Complex Congenital Heart Disease*.- Spectrum of Echocardiographic Findings in Bacterial Endocarditis*.- Echocardiographic Features of Straddling Tricuspid Valve*.- Detection of Congenital Ventricular Diverticulum by Cross Sectional Echocardiography*.- Evaluation of Left Ventricular Apical Aneurysms by Cross Sectional Echocardiography*.- Echocardiography in Patients with Marfan's Syndrome and Their Asymptomatic Relatives*.- Echocardiography in Wolff-Parkinson-White Syndrome*.- Echocardiographic Indocyanine Green (ICG) Dye Flow Patterns in Patients with Truncus Arteriosus (TA), Tetralogy of Fallot (TF), and Pulmonary Atresia with Ventricular Septal Defect (PA)*.- Quantification and Prognosis of Acute Myocardial Infarction: Comparison of Echocardiographic and Catheterization Indices*.- Right Ventricular Compression: A Reliable Echocardiographic Sign of Cardiac Tamponade*.- Pre- and Postoperative Echographic Investigation of Left Ventricular Function in Aortic Stenosis (AS)*.- Left Ventricular Volume Determinations of Canine Models*.- Role of Echocardiography in the Assessment of Left Ventricular Function in Patients with Coronary Artery Disease*.- Effects of Sodium Nitroprusside on Left Ventricular Size and Performance in Myocardial Infarction Determined by Ultrasound*.- Echocardiographic and Ultrasono-Tomographic Study of the Left Ventricular Dynamics in LBBB*.- The Effect of Phasic Respiration and Atrial Systole on the Echocardiographic Determination of Left Ventricular Function*.- Echocardiographic (ECHO) Method of Scintillation Probe Placement for Radiocardiographic Assessment (RCG) of Left Ventricular Ejection Fraction (LVEF)*.- Medium for External Acoustic Transmission*.- Abdominal.- Differential Diagnosis of Echo-Free Renal Masses.- Ultrasound Diagnosis in Renal Transplants.- Ultrasound Diagnosis of Lymphoceles Following Renal Transplantation.- Role of Ultrasound in the Diagnosis and Therapy of Perirenal Fluid Collections Following Renal Transplantation.- Aortosonography - The Diagnostic Method of Choice.- Radiation Therapy Planning Using Ultrasound.- Accuracy of Grey-Scale Ultrasonic Examination of the Liver*.- Correlative Studies Between Multi-Plane Tomographic Nuclear Imaging and Grey Scale Ultrasound in Extra and Intrahepatic Abnormalities*.- Ultrasonic Evaluation of the Common Bile Duct*.- Normal and Abnormal Pancreatic Echography*.- Grey Scale Ultrasonography in the Differential Diagnosis of Chronic Splenomegaly*.- Solid Renal Lesions: Ultrasonic and Angiographic Correlation*.- The Place of B-scan Ultrasound in the Examination of Kidneys not seen on Intravenous Pyelography*.- Long-Term Results of Ultrasonically Guided Percutaneous Aspiration of Renal Cysts*.- Ultrasonic Imaging of the Abdominal Aorta with Real-Time Multielement Systems*.- Normal Upper Abdominal Vasculature - A Study Correlating Contact B Scanning with Arteriography and Gross Anatomy*.- Prostatic Scanning with Gray Scale Ultrasound*.- Measurement of Size and Weight of Prostate by Means of Transrectal Ultrasonotomography*.- Abdominal Ultrasound and Computerized Axial Radiographic Tomography*.- Use of Simethicone in Abdominal Echotomography*.- Obstetrics and Gynecology.- Real-Time Scanning in the Management of Early Pregnancy Complications.- Real-Time Gray-Scale B-Scan Ultrasound Recording of Human Fetal Breathing Movements In Utero.- Detection of Fetal Heart Beats Using the TM-Mode.- Use of Grey Scale Sonography in the Morphological Diagnosis of Selected Gynecologic Tumors.- Application of the Multiple Head Transducer Scanning Device in Early Pregnancy*.- Role of Ultrasound in the Detection and Management of Intrauterine Growth Retardation and Associated Placental Abnormalities*.- Fetal and Neonatal Heart Size Correlation by Ultrasonic Imaging*.- Diagnostic Ultrasound for Detection of Intrauterine Growth Retardation*.- Ultrasonic Evaluation of Pelvic Masses in Pregnancy*.- Aminocentesis under Ultrasound Guidance with Aspiration Transducer*.- Ultrasonically Guided Fetal Injection of Vitamin-K (phytomenadione)*.- Grey Scale Patterns in Pelvic Inflammatory Disease*.- Use of B-Scan and Gray Scale Imaging in the Diagnosis of Benign Cystic Teratoma*.- Ultrasonic Identification of the Position of Contraceptive Device in Utero and its Relation to Subsequent Performance*.- Neurology.- Ultrasound for Identification of Brain Damage in Infants and Young Children.- Ultrasound Scanning of Excised Brains to Localize Pathology*.- Lateral Ventricular Measurement During Infancy*.- Ophthalmology.- Power Spectral Resonance Analysis in the Evaluation of Vitreous Pathology*.- Ultrasonographic Diagnosis of Tumors of the Anterior Choroid and Ciliary Body*.- The Ultrasonographic Characteristics of Orbital Dermoid Cysts*.- Posterior Ocular Curvature by B Scan Ultrasonography*.- Ultrasonic Findings in Diabetic Vitreoretinopathy*.- Other Organs.- Evaluation of Solitary Cold Thyroid Nodules by Echography and Thermography*.- A Large Aperture…