Body and Cardiovascular MR Imaging at 3.0 T

Lee, Vivian S.; Hecht, Elizabeth M.; Taouli, Bachir; Chen, Qun; Prince, Keyma; Oesingmann, Niels

doi:10.1148/radiol.2443060582

Cited by 85 publications

(50 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…MRI has been proven of clinical value for assessment of cardiac function and structure (7,8,26). The unique challenges posed by cardiac imaging such as physiological motion and position of the heart can decrease image quality, especially SNR in low filed MRI (8,27). Three tesla MRI overcomes the limitation of 1.5 T MRI and extends the capabilities of cardiac MRI.…”

Section: Discussionmentioning

confidence: 99%

Assessing Mitral Regurgitation in Patients with Dilated Cardiomyopathy Using 3.0T Cardiac Magnetic Resonance Imaging: Correlation with Morphological and Functional Abnormalities

et al. 2016

View full text Add to dashboard Cite

Background: Mitral regurgitation frequently accompanies dilated cardiomyopathy (DCM), which is associated with poor prognosis. Objectives: To evaluate morphological and functional abnormalities in DCM patients and correlate these features with the severity of coexistent mitral regurgitation using 3.0 T magnetic resonance imaging (MRI). Patients and Methods: Forty-one patients with DCM and 26 healthy control subjects underwent MRI and echocardiography examinations. The maximum and minimum mitral annulus areas (MAA), diameters of left ventricle and atrium, end-diastolic and systolic volumes, and ejection fraction were assessed with MRI and were indexed to body surface area. Mitral regurgitation severity grading was estimated by echocardiography. Results: Of the 41 patients with DCM, echocardiography examination revealed 11 patients (27%) without mitral regurgitation and 12 (29%) with mild, 11 (27%) with moderate, and seven (17%) with severe mitral regurgitation. All of the morphological and functional parameters of left ventricle, atrium and mitral valve in DCM patients were greater than those in healthy subjects (all P < 0.05), except for ejection fraction. The indexed end-systolic diameters of left ventricle (LVESD) and atrium (LAESD) and indexed minimum MAA might have the capability to distinguish no/mild mitral regurgitation patients from moderate/severe patients (areas under the receiver operating characteristic curve [AUC] = 0.876, 0.816, and 0.773, respectively; all P < 0.05). Using a combination of indexed LAESD, LVESD and minimum MAA, the specificity increased to 91.3%. Conclusion: Mitral regurgitation in DCM patients is associated with morphological and functional abnormalities of left heart and mitral valve annulus. The indexed LVESD, LAESD, and minimum MAA values can assist in predicting the severity of mitral regurgitation with a high sensitivity and specificity.

show abstract

Section: Discussionmentioning

confidence: 99%

Assessing Mitral Regurgitation in Patients with Dilated Cardiomyopathy Using 3.0T Cardiac Magnetic Resonance Imaging: Correlation with Morphological and Functional Abnormalities

et al. 2016

View full text Add to dashboard Cite

show abstract

“…Motion artifacts propagated from the contracting heart and pulsating aorta may induce substantial signal loss in diffusion-weighted images depending on the cardiac phase [19,20] and may impair reliability and reproducibility of ADC measurements of liver parenchyma and lesions. Not surprisingly, only very few articles discuss this issue or demonstrate images with pathology in the left liver lobe [4,[21][22][23]. Subjective quali- tative image analysis showed that these artifacts were even more pronounced at 3 T. This could be an effect of increased chemical-shift and susceptibility, and blooming of gas-containing bowel loops.…”

Section: Discussionmentioning

confidence: 99%

Impact of Field Strength and Respiratory Motion Control on Diffusion-Weighted MR Imaging of the Liver

Berg¹,

Månsson²,

Svensson³

et al. 2013

OJMI

View full text Add to dashboard Cite

Purpose: To evaluate the impact of field strength and respiratory motion control on diffusion-weighted MR imaging (DWI) of the liver at 1.5 and 3 T. Material and Methods: Three DWI sequences using seven b-values from 20 -400 s/mm 2 were designed with identical parameters but with different handling of respiratory motion [respiratory triggered (RT), free breathing (FB), breath hold (BH)] on 3 T and 1.5 T. Thirteen volunteers were examined at a 3 T and six of them also at a 1.5 T magnet. DW images were analyzed quantitatively and qualitatively. Regions of interest were placed in cranial, middle and caudal parts of the right liver lobe (RLL) and ADC and SNR were calculated. Results: ADC in RLL tended to be lower at 3 T MRI. Least inter-subject ADC variability was found with RT in the middle RLL at 3 T. Highest ADCs were found caudally in the RLL. Significant differences in ADC between middle and caudal RLL were calculated in FB and RT at 3 T and FB and BH at 1.5 T, respectively. No significant difference in SNR was found between 3 T and 1.5 T. There were significantly more artifacts in the left liver lobe (LLL) compared to the RLL in all sequences and in the LLL at 3 T compared to 1.5 T. Conclusion: Our study suggests that longitudinal hepatic ADC measurements should be performed using equivalent field strength, b-values, and acquisition technique, given influence of these factors on ADC measurements.

show abstract

“…[13][14][15][16] With MR imaging systems with higher gradient strengths and slew rates, T1-and T2-weighted ocular imaging with higher SNR and better temporal resolution could be obtained. 18,23 A 76-mm-diameter commercial surface coil was used, and high spatial resolution images of the eyeball were obtained. However, smaller diameter microscopy surface coils with high sensitivity could be useful for clearer delineation of the eyeball.…”

Section: Discussionmentioning

confidence: 99%