Comparison of blood flow imaging concepts with coherent and incoherent RF carriers in the 50 MHz region for application in dermatology

Author

Vogt, Michael ; Ermert, Helmu

Author_Institution

Dept. of Electr. Eng., Ruhr-Univ., Bochum, Germany

Volume

2

fYear

1999

fDate

1999

Firstpage

1499

Abstract

Pulsed Wave Doppler (PWD) concepts can be classified with respect to the applied bandwidth (narrowband/wideband), the signal generation process (coherent/incoherent RF carrier) and the data acquisition scheme (I/Q/direct RF signal sampling). The different system concepts are discussed, resulting in a transition from frequency domain approaches for velocity estimation to time domain and combined time/frequency domain approaches. A high frequency imaging system (50 MHz range) for applications in dermatology was implemented. Different modalities for PWD processing are compared (color flow, power mode, duplex mode). Additionally, a pseudo-continuous wave Doppler (CWD) mode was implemented for sensitive lateral vessel topography imaging. Results from phantom measurements and from measurements in vivo are presented

Keywords

Doppler measurement; biomedical ultrasonics; blood flow measurement; skin; 50 MHz; US imaging; blood flow imaging concepts comparision; color flow; dermatology; duplex mode; in vivo measurements; medical diagnostic imaging; phantom measurements; power mode; pseudocontinuous wave Doppler mode; sensitive lateral vessel topography imaging; Bandwidth; Blood flow; Frequency domain analysis; Narrowband; Pulse generation; RF signals; Radio frequency; Signal generators; Signal processing; Wideband;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 1999. Proceedings. 1999 IEEE

Conference_Location

Caesars Tahoe, NV

ISSN

1051-0117

Print_ISBN

0-7803-5722-1

Type

conf

DOI

10.1109/ULTSYM.1999.849281

Filename

849281