Gated cardiac magnetic resonance structural imaging: optimization by electronic axial rotation.

Feiglin, D H; George, C. R. P.; MacIntyre, W.J.; O'Donnell, J K; Go, Raymundo T.; Pavlicek, William; Meaney, T F

doi:10.1148/radiology.154.1.3155478

Cited by 53 publications

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“…The recent advances of MRI have enabled us to exactly obtain short-axis images of the left ventricle at the apical level [12,13]. The present study disclosed that hypertrophy was not necessarily circumferential at the apical level, and was frequently localized in the septum or anterior or lateral wall at the apical level.…”

Section: Intraobserver and Interobserver Variabilitiesmentioning

confidence: 50%

“…And recent advances of electrocar diogram (ECG)-gated MRI with gradient angle rotation have enabled us to obtain the true short-axis images of the left ventricle at the various levels and to measure precisely the wall thicknesses of the whole left ventricle [12,13]. In the present study, we utilized MRI to evalu ate the degrees and distributions of hypertrophied myo cardium at the apical level in the patients with AH, and studied the relationships between the distributions of hypertrophy at the apical level and the distributions of negative T waves on ECG.…”

Section: Introduction Right Ventriclementioning

confidence: 99%

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Diversity of the Localization of Myocardial Hypertrophy at the Apical Level in Patients with Apical Hypertrophy Evaluated by Magnetic Resonance Imaging

Suzuki¹,

Sugimoto²,

Sakamoto³

et al. 1990

Am J Noninvas Cardiol

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To evaluate the distributions of hypertrophy at the apical level in 20 patients with apical hypertrophy, end-diastolic wall thicknesses were measured on the left ventricular short axis image using magnetic resonance imaging. Distributions of hypertrophy with wall thickness equal to or more than 1.5 cm at the apical level were circumferential in 2 patients, septal-anterior-lateral in 7, septal-anterior in 2, anterior-lateral in 2, septal in 1, anterior in 3 and lateral in 3. Apical hypertrophy could not be diagnosed in 6 of 20 patients on left ventriculograms in right anterior oblique view nor on magnetic resonance long axis images corresponding to left ventriculogram, because the septal and lateral walls could not be evaluated on this view. Localized apical hypertrophy whose hypertrophied muscles are confined to the apical septum or the apical anterior wall or the apical lateral wall has been discovered. Although ‘spade like’ configuration on left ventriculography is considered as the diagnostic criterion, circumferential evaluations of the apex using short axis image are mandatory for the diagnosis.

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Section: Intraobserver and Interobserver Variabilitiesmentioning

confidence: 50%

Section: Introduction Right Ventriclementioning

confidence: 99%

Diversity of the Localization of Myocardial Hypertrophy at the Apical Level in Patients with Apical Hypertrophy Evaluated by Magnetic Resonance Imaging

Suzuki¹,

Sugimoto²,

Sakamoto³

et al. 1990

Am J Noninvas Cardiol

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“…2). The appropriate angulation for short axis views is obtained by electronic axial rotation [2]. Alternatively, a combination of electronic axis rotation and patient positioning can be employed [3].…”

Section: Determination Of Ejection Fraction By Spin-echo Mrimentioning

confidence: 99%

Cardiac function by magnetic resonance imaging

et al. 1988

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Gated magnetic resonance imaging of the heart displays cardiac structures with excellent resolution. This ability should be useful for assessment of cardiac physiology where acquisition of systolic and diastolic images is required. In this study, left ventricular ejection fraction was determined in 50 patients from oblique long axis views of the left ventricle using the area length formula. Angulated views were obtained by electronic gradient angulation. For comparison, all patients had monoplane angiocardiography in the RAO position. Forty-five patients were also studied by radionuclide ventriculography. Ejection fractions determined by MRI and angiocardiography were closely correlated (r = 0.90). Correlation between MRI and radionuclide ventriculography was also acceptable (r = 0.79). In addition to global left ventricular function, MR images provide information about regional wall motion. In order to acquire a three-dimensional set of images at various phases of the cardiac cycle, shorter imaging times are mandatory. A new imaging technique with potential for functional studies uses low flip angles, short repetition times and gradient refocused echoes. Up to 40 images can be obtained within one cardiac cycle. When displayed in a looped fashion, visual assessment of cardiac motion, intracardiac blood flow, and systolic wall thickening is possible. Potential advantages of functional studies by MRI are the concomitant acquisition of anatomical information and the three dimensional frame of reference.

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“…Multiple imaging planes, e.g., transverse, sagittal or coronal, can be obtained in a direct signal acquisition. Tomograms can also be obtained in nonorthogonal planes which conform more closely to the long and short axis of the heart of left ventricle (10).…”

Section: Instrumentationmentioning

confidence: 99%

Magnetic resonance imaging of the heart

Tscholakoff

Higgins

1985

Int J Cardiac Imag

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SummaryMagnetic resonance imaging (MRI) is a completely noninvasive technique for the evaluation of the cardiovascular system. With a multi-section technique and the spin echo pulse sequence the entire heart can be examined within six to ten minutes. All our cardiac MR studies were performed with electrocardiographic (ECG) gating, to obtain adequate resolution of the cardiac structures. With this technique, patients and animals with a variety of cardiac abnormalities were studied. The examined pathologic conditions included acute and chronic myocardial infarctions and their complications, hypertrophic and congestive cardiomyopathies, congenital heart diseases and pericardial diseases. MRI offers an enormous potential for cardiovascular diagnosis, even beyond the demonstration of pathoanatomy, because of the capability for direct tissue characterization and blood flow measurements.

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Gated cardiac magnetic resonance structural imaging: optimization by electronic axial rotation.

Cited by 53 publications

References 0 publications

Diversity of the Localization of Myocardial Hypertrophy at the Apical Level in Patients with Apical Hypertrophy Evaluated by Magnetic Resonance Imaging

Diversity of the Localization of Myocardial Hypertrophy at the Apical Level in Patients with Apical Hypertrophy Evaluated by Magnetic Resonance Imaging

Cardiac function by magnetic resonance imaging

Magnetic resonance imaging of the heart

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