Powis, Raymond L. <br/><br/>
A thinker’s guide to ultrasonic imaging / 
R.L. Powis, W.J. Powis. 
 - Baltimore :  Urban & Schwarzenberg,  1984. 
 - xiii, 417 p. :  ill. ;  27 cm. 
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>0-8067-1581-2 3-541-71581-2 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Diagnostic ultrasonic imaging