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Journal of Diagnostic Medical Sonography
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The Use of a Stand-of Device in High Pulse Repetition Frequeny Doppler Echocardiography

Charles M. Drake, BA, RDCS

Diagnostic Ultrasound Program, Bellevue Community College, Bellevue, Washington; 10715 N.E. 195th, Bothell, WA 98011.

Carol Kraft, BS, RDCS

Echocardiography Laboratory, University of Washington, Seattle, Washington.

An interesting case of severe mitral stenosis in which Doppler echocardiographic evaluation was greatly enhanced by use of a stand-off pad is discussed. When employing high pulse repetition frequency (HPRF) Doppler, it may be difficult to place the sample volume at the area of interest while remaining in HPRF mode, because it is not always clear that there is a certain minimum sample volume depth below which a system will not operate in HPRF. This and other related technical constraints vary from machine to machine. This case illustrates that sample volumes can be manipulated by using a stand-off pad, thereby making use of HPRF possible. The specifications of the HPRF mode on the Acuson 128XP (Acuson, Mountain View, CA) are examined in detail, and possible applications of this technique in similar difficult situations that may arise in clinical practice are discussed.

Key Words: high pulse repetition frequency • high PRF • stand-off pad • pressure half-time • mitral stenosis • Doppler echocardiography

Journal of Diagnostic Medical Sonography, Vol. 11, No. 1, 23-27 (1995)
DOI: 10.1177/875647939501100105
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