Results 211 to 220 of about 42,032 (254)
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Doppler US gating of cardiac MR imaging
Academic Radiology, 2000Electrocardiographic (ECG) gating of cardiac magnetic resonance (MR) imaging has been problematic for many reasons. The purpose of this study was to demonstrate the feasibility of using Doppler ultrasound (US) gating, either directly off the moving cardiac wall or the systolic upstroke of the arterial signal from the great vessels in neck, in ...
Jonathan Rubin +2 more
exaly +3 more sources
European Journal of Nuclear Medicine, 1988
An ECG gated tomographic system is described and its application to routine diagnosis of cardiac wall dyskinesis discussed. The tomographic sections are gathered by a single section scanning system (Aberdeen Section Scanner). Technetium labelled red blood cells are used as the imaging agent.
M Y, Norton, S, Walton, N T, Evans
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An ECG gated tomographic system is described and its application to routine diagnosis of cardiac wall dyskinesis discussed. The tomographic sections are gathered by a single section scanning system (Aberdeen Section Scanner). Technetium labelled red blood cells are used as the imaging agent.
M Y, Norton, S, Walton, N T, Evans
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Journal of Computer Assisted Tomography, 1979
Retrospective electrocardiograph gating of data from a rotating detector fan beam computed tomography system was employed to produce end systolic and end diastolic images of the beating heart in a series of normal and experimentally infarcted canines.
W H, Berninger +4 more
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Retrospective electrocardiograph gating of data from a rotating detector fan beam computed tomography system was employed to produce end systolic and end diastolic images of the beating heart in a series of normal and experimentally infarcted canines.
W H, Berninger +4 more
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SPIE Proceedings, 1995
There are several theoretic advantages to synchronizing positive pressure breaths with the cardiac cycle, including the potential for improving distribution of pulmonary and myocardial blood flow and enhancing cardiac output. The authors evaluated the effects of synchronizing respiration to the cardiac cycle using a programmable ventilator and electron
C. William Hanson III, Eric A. Hoffman
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There are several theoretic advantages to synchronizing positive pressure breaths with the cardiac cycle, including the potential for improving distribution of pulmonary and myocardial blood flow and enhancing cardiac output. The authors evaluated the effects of synchronizing respiration to the cardiac cycle using a programmable ventilator and electron
C. William Hanson III, Eric A. Hoffman
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Cardiac CT with Prospective Cardiac Gating
1998CT has revolutionised body imaging over the past 20 years but has had surprisingly little impact on cardiac diagnosis. Acquisition times are long relative to the length of the cardiac cycle, with motion reconstruction artefacts severely degrading image quality. Despite progressive reductions in exposure time and the development of slip ring technology,
R. A. Coulden, M. P. Hayball
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Prospectively gated cardiac computed tomography
Medical Physics, 1983A fourth‐generation scanner has been modified to perform prospectively gated cardiac computed tomography (CT). A computer program monitors the electrocardiogram (ECG) and predicts when to initiate the next scan in a gated series in order to acquire all projection data for a desired phase of the heart cycle.
S C, Moore +8 more
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Reconstruction of dynamic gated cardiac SPECT
Medical Physics, 2006In this paper we propose an image reconstruction procedure which aims to unify gated single photon emission computed tomography (SPECT) and dynamic SPECT into a single method. We divide the cardiac cycle into a number of gate intervals as in gated SPECT, but treat the tracer distribution for each gate as a time‐varying signal. By using both dynamic and
Mingwu, Jin +2 more
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Cardiac PET imaging in mice with simultaneous cardiac and respiratory gating
Physics in Medicine and Biology, 2005Gating firmware and software were developed for the microPET II small animal scanner. The measured cardiac and respiratory signals were collected and converted to TTL gating signals by a Biopac MP150 data acquisition system and sent to microPET II through two BNC connectors on the front panel.
Yongfeng, Yang +4 more
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Prospectively gated cardiac CT
2007 IEEE Nuclear Science Symposium Conference Record, 2007Future cardiac CT protocols will utilize large area detectors with whole heart scans performed within one heartbeat. For such scans, accurate prospective ECG gating is essential to capture the heart at the correct phase. This report addresses one of the main factors affecting the prospective gating accuracy: the ability to predict the cardiac phase ...
Dominic Heuscher, Stanislav Zabic
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1996
The sections in this article are 1 Introduction 2 Requirement of Cardiac Gating 3 Methods of Cardiac Monitoring 4 Artifacts on the Electrocardiogram 5 Electrocardiogram Electrode and Lead Positioning 6 Prospective and Retrospective Gating 7 Implications of the Gating Type on the Accuracy of Blood Flow Mapping 8 ...
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The sections in this article are 1 Introduction 2 Requirement of Cardiac Gating 3 Methods of Cardiac Monitoring 4 Artifacts on the Electrocardiogram 5 Electrocardiogram Electrode and Lead Positioning 6 Prospective and Retrospective Gating 7 Implications of the Gating Type on the Accuracy of Blood Flow Mapping 8 ...
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