Cardiac MR Imaging

Haacke, E. Mark; Li, D; Kaushikkar, S

doi:10.1097/00002142-199500740-00002

Cited by 40 publications

(17 citation statements)

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“…CARDIAC MR IMAGING has been used as a non‐invasive method for the assessment of ventricular function for over a decade (1–5). The segmented k‐space fast gradient echo (GRE) sequence is commonly accepted as an accurate and reproducible technique for measuring ventricular volumes and masses (6–10). With recent advances in MRI hardware and software, fast imaging employing steady‐state acquisition (FIESTA) cine technique, also known as balanced fast field echo (FFE), true fast imaging with steady‐state precession (TrueFISP), or steady‐state free precession (SSFP) cine technique by different manufacturers, has been increasingly applied for the assessment of ventricular function, because FIESTA techniques provide better blood‐myocardial contrast, higher image quality, and shorter acquisition time (11–16).…”

mentioning

confidence: 99%

MR assessment of left ventricular function: Quantitative comparison of fast imaging employing steady‐state acquisition (FIESTA) with fast gradient echo cine technique

Stern

et al. 2002

Magnetic Resonance Imaging

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Purpose:To evaluate the agreement of fast imaging employing steady-state acquisition (FIESTA) cine technique with segmented k-space fast gradient echo (GRE) cine technique when using them for assessment of cardiac function. Materials and Methods:Eleven MR cine studies were performed on six healthy volunteers and five patients, using FIESTA and fast GRE techniques. The quantitative measurements of ventricular function obtained from the two techniques were compared. The data analysis was performed by two observers independently.Results: Compared to fast GRE cine technique, FIESTA cine technique consistently resulted in higher end-diastolic volume (10.2%) and end-systolic volume (21.6%), but lower myocardial mass of left ventricle (19.2%) and ejection fraction (9.9%). The stroke volume obtained from the two techniques was very close. The primary explanation for this variability is that the two techniques have different mechanisms on establishing signal contrast. Conclusion:Compared to fast GRE technique, FIESTA provides significantly different results when using it for assessment of left ventricular function. It is important to consider this difference in the assessment of cardiac function. CARDIAC MR IMAGING has been used as a non-invasive method for the assessment of ventricular function for over a decade (1-5). The segmented k-space fast gradient echo (GRE) sequence is commonly accepted as an accurate and reproducible technique for measuring ventricular volumes and masses (6 -10). With recent advances in MRI hardware and software, fast imaging employing steady-state acquisition (FIESTA) cine technique, also known as balanced fast field echo (FFE), true fast imaging with steady-state precession (True-FISP), or steady-state free precession (SSFP) cine technique by different manufacturers, has been increasingly applied for the assessment of ventricular function, because FIESTA techniques provide better blood-myocardial contrast, higher image quality, and shorter acquisition time (11-16). However, in selecting a new technique for measurement of LV volume and mass, it is crucial to compare the new technique with an established one to determine whether they agree sufficiently. If they do not agree, we need to assess how much the two methods differ. In this study, we compared the quantitative measurements of ventricular function obtained using FIESTA and fast GRE cine techniques to evaluate the agreement of the two. Five parameters, including end-diastolic volume (EDV), end-systolic volume (ESV), myocardial mass of left ventricle at enddiastole, stroke volume (SV), and ejection fraction (EF) were analyzed. MATERIALS AND METHODSEleven MR studies were performed on six healthy volunteers (three men, three women, average age 29.3, ranging from 20 to 42 years of age) and five patients (two men, three women, average age 59.2, ranging from 30 to 81 years of age). In the five patients, one with known atrial septal defect was imaged prior to surgical operation, two had known coronary artery disease, one had a suspected cardiac ...

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confidence: 99%

MR assessment of left ventricular function: Quantitative comparison of fast imaging employing steady‐state acquisition (FIESTA) with fast gradient echo cine technique

Stern

et al. 2002

Magnetic Resonance Imaging

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“…In a dynamic MRI experiment, the signal, S(t), in a voxel at time t caused by N chemical species each with relative intensity, ρ n , and chemical shift frequency, Δf n , can be modeled by where R * 2 is the effective transverse relaxivity constant and φ is a phase shift caused by static field inhomogeneity. 26 The pervoxel R * 2 and φ maps can be estimated using a method such as direct phase estimation, 27,28 and after applying these maps as corrections to the acquired images, Equation (1) can be written in the matrix form as where x is the unknown vector of the intensities of the species…”

Section: Data Modelmentioning

confidence: 99%

Dynamic volumetric hyperpolarized ¹³C imaging with multi‐echo EPI

Deh

Granlund

Eskandari

et al. 2020

Magnetic Resonance in Med

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Purpose To generate dynamic, volumetric maps of hyperpolarized [1‐13C]pyruvate and its metabolic products in vivo. Methods Maps of chemical species were generated with iterative least squares (IDEAL) reconstruction from multiecho echo‐planar imaging (EPI) of phantoms of thermally polarized 13C‐labeled chemicals and mice injected with hyperpolarized [1‐13C]pyruvate on a preclinical 3T scanner. The quality of the IDEAL decomposition of single‐shot and multishot phantom images was evaluated using quantitative results from a simple pulse‐and‐acquire sequence as the gold standard. Time course and area‐under‐the‐curve plots were created to analyze the distribution of metabolites in vivo. Results Improved separation of chemical species by IDEAL, evaluated by the amount of residual signal measured for chemicals not present in the phantoms, was observed as the number of EPI shots was increased from one to four. Dynamic three‐dimensional metabolite maps of [1‐13C]pyruvate,[1‐13C]pyruvatehydrate, [1‐13C]lactate, [1‐13C]bicarbonate, and [1‐13C]alanine generated by IDEAL from interleaved multishot multiecho EPI of live mice were used to construct time course and area‐under‐the‐curve graphs for the heart, kidneys, and liver, which showed good agreement with previously published results. Conclusions IDEAL decomposition of multishot multiecho 13C EPI images is a simple, yet robust method for generating high‐quality dynamic volumetric maps of hyperpolarized [1‐13C]pyruvate and its products in vivo and has potential applications for the assessment of multiorgan metabolic phenomena.

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“…25). In clinically approved CMR procedures, electrocardiography (ECG) or pulse oximetry are used for cardiac gating and breath holding is applied for freezing respiratory motion [61], [62]. However, there are unmet needs of clinical CMR, particularly for high (≥ 3 T) and ultra-high (≥ 7 T) field MRI.…”

Section: Cardiac Magnetic Resonance Imagingmentioning

confidence: 99%