2 edition of Prospective correction of trigger delay for coronary artery imaging. found in the catalog.
Prospective correction of trigger delay for coronary artery imaging.
Written in English
Cardiac motion continues to limit the ability of magnetic resonance imaging (MRI) and multi-slice computed tomography (MSCT) to obtain coronary artery images with fine enough resolution to help reliably diagnose significant threats of ischemic heart disease. A generally accepted method of dealing with cardiac motion, known as gating, is to limit image data acquisition to presumed low-motion periods in the heart. Formulae have been accepted for crudely approximating the onset and duration of these periods. Recently, the concept of these periods undergoing substantial tranformations with heart rate has been investigated. This work examines how the electrocardiogram (ECG) can be used to adapt imaging trigger delays to this effect. The developments described in the thesis are intended to advance the ability of prospective gating to adapt to heart rate variations. Ultimately, this may improve the ability of MRI and MSCT to provide sharp coronary artery images.
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1. Introduction. Coronary artery disease (CAD) is the leading cause of death in the Western world and developing countries .The gold standard imaging modality for detection of CAD is X-ray angiography, which is invasive, exposes patients to potentially harmful radiation and requires iodinated contrast agents. Optical coherence tomography (OCT) is a high-resolution imaging technology, which can provide detailed observation of the vulnerable coronary atherosclerotic plaques in clinical settings. The current understanding of the major cause of acute coronary syndrome is that it results from plaque rupture of a vulnerable plaque. OCT can provide detailed observation of the vulnerable .
The value of getting MRI closer to coronary artery diagnosis, is because with MRI there are no damaging x-rays or ionizing radiation used during the imaging process like there is in CT cardiac scoring. Even with reduced dose CT scanners, there is still damaging x-ray needed to create the images for diagnosis. January 6, - The image quality of multidetector computed tomography (MDCT) scans used for the noninvasive detection of coronary artery disease can be significantly affected by patient characteristics, such as ethnicity, body mass index (BMI), and heart rate.
OBJECTIVE: The educational objective of this evidence-based self-assessment module is to use case examples to review the current evidence and the roles of CT and MRI in evaluating and managing patients with both congenital and acquired coronary artery disease. Noninvasive cardiac imaging is a cornerstone of the diagnostic work-up in patients with suspected coronary artery disease (CAD), cardiomyopathy, heart failure, and congenital heart disease. It is essential for the assessment of CAD from functional and anatomical perspectives, and is considered the gate-keeper to invasive coronary angiography.
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Subject-specific trigger delays for LMPs at end-systole and diastasis were obtained at baseline and elevated heart rates for the proximal right coronary artery via MR imaging.
The use of ΔRT n from the RT n vs. RR n-1 relationship to correct the baseline trigger delays at elevated heart rates was evaluated. Introduction. Coronary artery diseases remain the leading cause of death in most developed countries.1 Contrast-enhanced coronary angiography is currently the gold standard imaging technique for diagnosis of coronary anatomy.
However, it is an invasive and expensive procedure that sometimes requires the hospitalization of the patient, and a small risk of major. PURPOSE: To determine the potential benefit of prospective navigator correction of image position for coronary magnetic resonance (MR) angiography.
MATERIALS AND METHODS: Two-dimensional MR angiograms were obtained with free breathing in 12 adult subjects. Additionally, the determined trigger delay may not reflect the period of minimal motion for both left and right coronary arteries or different segments.
In this work, we present a whole-heart coronary imaging approach that allows flexible selection of the trigger delay timings by performing k-space sampling over an enlarged acquisition window. Relationship of coronary artery plaque composition to coronary artery stenosis severity: results from the prospective multicenter ACCURACY trial.
Min JK(1), Edwardes M, Lin FY, Labounty T, Weinsaft JW, Choi JH, Delago A, Shaw LJ, Berman DS, Budoff MJ. Comparison of Cardiac Imaging Techniques for Diagnosing Coronary Artery Disease (PACIFIC) The safety and scientific validity of this study is the responsibility of.
A prospective study for comparison of MR and CT imaging for detection of coronary artery stenosis. Hamdan A(1), Asbach P, Wellnhofer E, Klein C, Gebker R, Kelle S, Kilian H, Huppertz A, Fleck E. Author information: (1)Department of Internal Medicine/Cardiology, Deutsches Herzzentrum Berlin, Berlin, Germany.
The PACIFIC trial (Prospective Head-to-Head Comparison of Coronary CT Angiography, Myocardial Perfusion SPECT, PET, and Hybrid Imaging for Diagnosis of Ischemic Heart Disease using Fractional Flow Reserve as Index for Functional Severity of Coronary Stenoses) is the first head-to head comparison of the most commonly used non-invasive.
To evaluate the effect of a real-time adaptive trigger delay on image quality to correct for heart rate variability in 3D whole-heart coronary MR angiography (MRA). Purpose: To prospectively evaluate breath-hold capability and patterns, coronary artery rest periods, and β-blocker use in coronary magnetic resonance (MR) imaging.
Materials and Methods: Ethics committee approval and informed consent were obtained. In consecutive patients (mean age, years ± [standard deviation]; men, 64 women), breath-hold. Inelectron beam computed tomography (EBCT) was introduced as a non-invasive imaging modality for the diagnosis of coronary artery disease (Boyd and Lipton ; Agatston et al.
; Achenbach et al.Becker et al. The temporal resolution of ms allowed for motion-free imaging of the cardiac anatomy in the diastolic heart.
Imaging Tests Detect Coronary Artery Disease Long Before it Strikes Ma — Adding two non-invasive imaging tests to traditional cardiovascular disease risk factor assessment more precisely predicts a healthy patient’s future risk of heart attack, stroke, or premature death, according to a new study.
Coronary magnetic resonance imaging (MRI) requires a correctly timed trigger delay derived from a scout cine scan to synchronize k-space acquisition with the quiescent period of the cardiac cycle. However, heart rate changes between breath-held cine and free-breathing coronary imaging may result in inaccurate timing errors.
TY - JOUR. T1 - A practical guide to pediatric coronary artery imaging with echocardiography. AU - Brown, Lynne M. AU - Duffy, Catherine E. AU - Mitchell, Carol.
Objectives In this study, we sought to describe the mode of presentation, anatomic features, diagnostic techniques, and surgical outcome in a group of patients with anomalous origin of a coronary artery from the opposite sinus with an interarterial course between the great arteries (AOCA).
Background Anomalous origin of a coronary artery from the opposite sinus with an. Coronary artery disease (CAD) is a leading cause of global mortality. 1 It results from atherosclerosis, which is a systemic and progressive disease involving the intimal layer of large- and medium-sized arteries.
Atherothrombosis, defined as atherosclerotic plaque disruption (predominantly plaque rupture) with superimposed thrombosis, can lead to arterial occlusion. The heart is a muscular pump that receives deoxygenated blood and propels oxygenated blood to different parts of the body. It is composed of four chambers; the right atrium, right ventricle, left atrium and left ventricle.
On the right side deoxygenated blood from the superior and inferior vena cava enter the atrium whilst it is relaxed. trigger delay maynot reflect theperiodofminimal motionforboth leftandrightcoronaryar- (CNR),where thelumen ROIwasprescribed onthe targeted artery regionafter the multi-planar reformat,and themyocardium ROIwasprescribed onthemyo- Whole Heart Coronary Imaging with Flexible Acquisition Window and Trigger Delay.
The use of coronary MR angiography (CMRA) in patients with coronary artery disease (CAD) remains limited due to the long scan times, unpredictable and often non-diagnostic image quality secondary to respiratory motion artifacts.
The purpose of this study was to evaluate CMRA with image-based respiratory navigation (iNAV CMRA) and compare it to gold standard. coronary artery (Figure 3). In addition, the calcified plaques can be further characterized into focal and extensive types according to the distribution of the plaques along the coronary artery (Figure 4).
Classification of plaques by cardiac CT based on Research Highlight Cardiac CT imaging in coronary artery disease: Current status and. Fig. 2 A year-old patient with stents in the left anterior descending coronary artery (LAD) and left circumflex coronary artery (LCx) is shown.
On the XCA (a,b), mild coronary stenosis was observed in the mid- right coronary artery (RCA). On the MRA(c), the proximal RCA was not clearly detected (arrow). Introduction. Coronary artery disease (CAD) is the leading cause of death in adults in the USA, accounting for approximately a third of all deaths in subjects over the age of 35 years.
 Advanced. This is a pilot study on imaging strategies for diagnosis of coronary artery disease. The pilot trial aims to answer the question "Which non-invasive test (single photon emission computed tomography (SPECT), stress echocardiography or coronary CT angiography (CCTA)) is the best first test in suspected coronary artery disease with respect to patient outcome and .