34 Result(s)
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Article
Open AccessDevelopment and validation of AI-derived segmentation of four-chamber cine cardiac magnetic resonance
Cardiac magnetic resonance (CMR) in the four-chamber plane offers comprehensive insight into the volumetrics of the heart. We aimed to develop an artificial intelligence (AI) model of time-resolved segmentatio...
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Article
Open AccessPulmonary transit time is a predictor of outcomes in heart failure: a cardiovascular magnetic resonance first-pass perfusion study
Pulmonary transit time (PTT) can be measured automatically from arterial input function (AIF) images of dual sequence first-pass perfusion imaging. PTT has been validated against invasive cardiac catheterisati...
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Article
Open AccessAn acute increase in Left Atrial volume and left ventricular filling pressure during Adenosine administered myocardial hyperaemia: CMR First-Pass Perfusion Study
To investigate whether left atrial (LA) volume and left ventricular filling pressure (LVFP) assessed by cardiovascular magnetic resonance (CMR) change during adenosine delivered myocardial hyperaemia as part o...
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Article
Open AccessSafety and efficacy of interrupting dual antiplatelet therapy one month following percutaneous coronary intervention: a meta-analysis of randomized controlled trials
Very short duration of dual antiplatelet therapy (DAPT) following percutaneous coronary intervention (PCI) has recently attracted a lot of attention with the introduction of newer generations stents. This is a...
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Article
Open AccessShort-term adverse remodeling progression in asymptomatic aortic stenosis
Aortic stenosis (AS) is characterised by a long and variable asymptomatic course. Our objective was to use cardiovascular magnetic resonance imaging (MRI) to assess progression of adverse remodeling in asympto...
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Article
Open AccessAortic stiffness in aortic stenosis assessed by cardiovascular MRI: a comparison between bicuspid and tricuspid valves
To compare aortic size and stiffness parameters on MRI between bicuspid aortic valve (BAV) and tricuspid aortic valve (TAV) patients with aortic stenosis (AS).
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Chapter
Cardiac Masses
1. To confirm or refute the presence of a mass identified on CXR or Echo 2. To establish the tumor location, size and relationship to surrounding cardiac structures 3. To assist with tissue characterization 4....
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Chapter
Protons and Spins: The Origin of the MRI Signal
The primary origin of the MR signal is from water and fat within the patient’s tissue; specifically, it is from the hydrogen nuclei (consisting of a single proton) contained within free water and lipid molecules ...
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Chapter
Relaxation Times, Gradient Echoes, and Spin Echoes
Immediately after the rf pulse, the spin system starts to return back to its original state, that is, equilibrium. This process is known as relaxation. In fact, there are two distinct relaxation processes that re...
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Chapter
Pulmonary Vein Assessment
1. Anatomy module (Section 19.3.1) 2. LV function module (Section 19.4) 3. Breath-hold non-gated contrast-enhanced MRA performed in the coronal projection encompassing the pulmonary veins and left atrium (Sect...
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Chapter
Image Space and k-Space
The way that the MR signals are generated and encoded by the use of magnetic field gradients gives rise to a particular relationship between the data points in the signal and those in the image. A single data ...
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Chapter
Improving SNR with Surface Coils and Array Coils
Perhaps the most important aspect of MR in optimizing SNR is the choice of receiver coil. The integral body coil has a large field of view (Fig. 9.1a), but for imaging a smaller region of interest, it is much mor...
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Chapter
Pulse Sequences and Image Contrast
The MR signal intensity at a particular location is represented by the image pixel intensity. In Chaps. 8 and 9 it was shown that the strength of the MR signal relative to the background noise (SNR) depends on a ...
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Chapter
Black Blood Versus Bright Blood Imaging
The spin echo pulse sequence generates images that have intrinsic black blood contrast. This is because it uses two pulses, the 90° and 180° pulses, to produce the spin echo signal (Fig. 12.1). Both of these p...
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Chapter
Dealing with Respiratory Motion
Respiratory Compensation methods (Respiratory Gating)
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Chapter
The Basics of a CMR Study
A good referral is a key prerequisite for a clinically useful CMR study, providing relevant clinical background information, placing the scan in the appropriate context, and allowing the CMR department to opti...
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Chapter
Diseases of the aorta
To establish the location, size and patency of the aorta and its major branches
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Chapter
Pericardial Disease
Anatomy module including T1 and T2 weighting (page X)
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Chapter
The MRI Environment
The examination room contains the magnet assembly and patient table (Fig. 2.1). To prevent environmental electrical noise from interfering with the MRI signal, this room is enclosed within a rf shield (or Faraday...
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Chapter
Valvular Heart Disease
Echocardiography still plays a pivotal role in the evaluation of valvular heart disease. CMR can be useful in case of inadequate echocardiographic examination, in particular for the assessment of valvular regu...
