FREQUENCY-RESPONSE OF RETROSPECTIVELY GATED PHASE-CONTRAST MR-IMAGING - EFFECT OF INTERPOLATION

被引：39

作者：

FRAYNE, R ^{[1
]}

RUTT, BK ^{[1
]}

机构：

[1] UNIV WESTERN ONTARIO HOSP,DEPT MED BIOPHYS,LONDON N6A 5A5,ON,CANADA

来源：

JMRI-JOURNAL OF MAGNETIC RESONANCE IMAGING | 1993年 / 3卷 / 06期

关键词：

CAROTID ARTERIES; FLOW DYNAMICS; FLOW SIMULATION; IMAGE PROCESSING; PHASE IMAGING; PULSE SEQUENCES; VASCULAR STUDIES; VELOCITY STUDIES;

D O I：

10.1002/jmri.1880030619

中图分类号：

R8 [特种医学]; R445 [影像诊断学];

学科分类号：

1002 ; 100207 ; 1009 ;

摘要：

Retrospectively gated phase-contrast (PC) magnetic resonance velocity and volume flow measurements were evaluated in both in vitro and in vivo experiments. The accuracy of these measurements was found to be affected by the interpolation window width required in the reconstruction of retrospectively gated data. Interpolation modified the frequency content of the series of temporal measurements by decreasing the response at higher frequencies. With a series of sinusoidal now waveforms, the frequency response of one specific implementation of retrospectively gated PC velocity measurements was experimentally determined. The experimental response agreed with the theoretical response predicted from an analysis of the interpolating function (2.2% root-mean-square difference). In vitro experiments with a simulated carotid flow waveform demonstrated errors in the systolic measurements that were a direct result of the modified frequency response. A volunteer study was also undertaken and confirmed the in vitro findings.

引用

页码：907 / 917

页数：11

共 31 条

[1] Burns PN, Interpretation and analysis of Doppler signals, Clinical applications of Doppler ultrasound, pp. 107-109, (1988)
[2] Pelc NJ, Shimakawa A, Glover GH, Phase contrast cine MRI. (abstr), Book of abstracts: Society of Magnetic Resonance in Medicine 1989, (1989)
[3] Pelc NJ, Herfkens RJ, Shimakawa A, Enzmann DR, Phase contrast magnetic resonance imaging, Magn Reson Q, 7, pp. 229-254, (1991)
[4] Kondo C, Caputo GR, Semelka R, Foster E, Shimakawa A, Higgins CB, Right and left ventricular stroke volume measurements with velocity‐encoded cine MR, AJR, 157, pp. 9-16, (1990)
[5] Caputo GR, Masui T, Gooding GAW, Chang JM, Higgins CB, Popliteal and tiboperoneal arteries: feasibility of two‐dimensional time‐of‐flight MR angiography and phase velocity mapping, Radiology, 182, pp. 387-392, (1992)
[6] Nitz WR, Bradley WG, Watanabe AS, Et al., Flow dynamics of cerebrospinal fluid: assessment with phase‐contrast velocity MR imaging performed with retrospective cardiac gating, Radiology, 183, pp. 395-405, (1992)
[7] Marks MP, Pelc NJ, Ross MR, Enzmann DR, Determination of cerebral blood flow with phase‐contrast cine MR imaging technique: evaluation of normal subjects and patients with arteriovenous malformations, Radiology, 182, pp. 467-476, (1992)
[8] Rutt BK, Lee DH, Vellet DH, Frayne R, Napel S, Quantitative comparison of velocity measurements in the extracranial carotid arteries by 2D and 3D phase‐contrast versus colour‐flow Doppler ultrasound, (abstr), Book of abstracts: Society of Magnetic Resonance in Medicine 1991, (1991)
[9] Sondergaard L, Stahlberg F, Gymoese E, Et al., Comparison between ECG triggered and retrospective gating in MR velocity mapping (abstr), Book of abstracts: Society of Magnetic Resonance in Medicine 1992, (1992)
[10] Glover GH, Pelc NJ, A rapid‐gating cine MRI technique, Magnetic resonance annual, pp. 299-333, (1988)

← 1 2 3 4 →