Compensation for phase and amplitude imbalance in quadrature Doppler signals

被引：9

作者：

Moraes, R ^{[1
]}

Evans, DH ^{[1
]}

机构：

[1] UNIV LEICESTER,FAC MED,DIV MED PHYS,LEICESTER,LEICS,ENGLAND

来源：

ULTRASOUND IN MEDICINE AND BIOLOGY | 1996年 / 22卷 / 01期

关键词：

quadrature phase detection; Doppler ultrasound; crosstalk; phase shifter; digital filters;

D O I：

10.1016/0301-5629(95)02027-6

中图分类号：

O42 [声学];

学科分类号：

070206 ; 082403 ;

摘要：

Quadrature phase detection is widely used in ultrasound Doppler systems to obtain directional information about how velocities in blood vessels, The presence of phase and/or gain imbalance between the quadrature outputs produces crosstalk between the forward and reverse channels which may introduce errors into mean and maximum velocity estimates and hamper the interpretation of sonograms, This technical note describes the assessment of the crosstalk in a commercial pulsed-wave Doppler system, and suggests methods of compensation for the causative imbalance which can be implemented using digital signal processing techniques, Examples of applying these methods to the outputs of the commercial system are given.

引用

页码：129 / 137

页数：9

共 6 条

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[2]

Coghlan B A, 1976, Ultrasound Med Biol, V2, P181, DOI 10.1016/0301-5629(76)90035-1

[3] REALIZATION OF A CONSTANT PHASE DIFFERENCE [J].

DARLINGTON, S .

BELL SYSTEM TECHNICAL JOURNAL, 1950, 29 (01) :94-104

[4]

EVANS DH, 1989, DOPPLER ULTRASOUND

[5]

Oppenheim A.V., 1975, DIGIT SIGNAL PROCESS, P206

[6]

TAYLOR MG, 1984, THESIS U LONDON

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