MR-imaging of the thoracic aorta: 3D-ECG- and respiratory-gated bSSFP imaging using the CLAWS algorithm versus contrast-enhanced 3D-MRA

Kawel, Nadine; Jhooti, Permi; Dashti, David; Haas, Tanja; Winter, Leopold; Zellweger, Michael J.; Buser, Peter; Keegan, Jennifer; Scheffler, Klaus; Bremerich, Jens

doi:10.1016/j.ejrad.2010.12.040

Cited by 12 publications

(10 citation statements)

References 14 publications

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“…Further limitations in 3D estimations of LAV include the inability to distinguish epicardial fat and adjacent tissue from the left atrium, which leads to systematic overestimation compared to the Simpson's method. Therefore, these differences should be overcome using better software and an ECG-gated 3D method with respiratory navigator (19). In addition, in several studies of normal volunteers and patients with a sinus rhythm, it has been observed that the measurement of LAV by echocardiography underestimates the results obtained by cardiac computed tomography or MRI, which is most likely due to suboptimal limited acoustic windows of the specific study (6,7,12).…”

Section: Discussionmentioning

confidence: 99%

Left atrial volume quantification using cardiac MRI in atrial fibrillation: comparison of the Simpson’s method with biplane area-length, ellipse, and three-dimensional methods

Nacif

Barranhas²,

Türkbey³

et al. 2012

Diagn Interv Radiol

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Section: Discussionmentioning

confidence: 99%

Left atrial volume quantification using cardiac MRI in atrial fibrillation: comparison of the Simpson’s method with biplane area-length, ellipse, and three-dimensional methods

Nacif

Barranhas²,

Türkbey³

et al. 2012

Diagn Interv Radiol

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“…As a result of this recent discovery, there has been an increasing demand for non-contrast enhanced MRA especially for the patients who require multiple follow up studies. Unenhanced MRA including 3D ECG gated and respiratory navigated balanced steady-state free precision (SSFP) techniques obviate the need of contrast in these patients and the image quality here is also more acceptable as compared to contrast enhanced MRA (11)(12)(13)(14). The patients with renal failure may also benefit from unenhanced MRA since they cannot receive gadolinium due to risk of nephrogenic systemic fibrosis.…”

Section: Imagingmentioning

confidence: 99%

Congenital anomalies of the aortic arch

Priya

Thomas

Nagpal

et al. 2018

Cardiovasc. Diagn. Ther.

101

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Congenital anomalies of the aortic arch include diverse subgroups of malformations that may be clinically silent or may present with severe respiratory or esophageal symptoms especially when associated with complete vascular rings. These anomalies may be isolated or may be associated with other congenital heart diseases. Volume rendered computed tomography (CT) and magnetic resonance angiography (MRA) help in preoperative surgical planning by providing information about the complex relationship of aortic arch and its branches to the trachea and esophagus. Three dimensional capabilities of both computed tomography angiography (CTA) and MRA are helpful in determining evidence of tracheal or esophageal compression or other high-risk features in patients with a complete vascular ring.

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“…This algorithm automatically provides the fastest possible acquisition regardless of changes in the respiratory pattern and has been previously described in detail (12). A study to determine the effectiveness of the CLAWS algorithm implemented with a 3D balanced steady‐state free precession (bSSFP) sequence against conventional contrast‐enhanced 3D angiography demonstrated significantly superior image quality (13). However, although the respiratory efficiency of the CLAWS algorithm was the best possible for each breathing pattern, the scan time is still long, with a mean time of 7 min 16 s for a high‐resolution 3D image.…”

mentioning

confidence: 99%

Use of respiratory biofeedback and CLAWS for increased navigator efficiency for imaging the thoracic aorta

Jhooti

Haas

Kawel

et al. 2011

Magnetic Resonance in Med

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A novel technique to guide a subjects' breathing pattern using a respiratory biofeedback (rBF) “game” to improve respiratory efficiency is presented. The continuously adaptive windowing strategy, a fully automatic and highly efficient free-breathing navigator gated technique, is used to acquire the data as it ensures that all potential navigator acceptance windows are possible. This enables the rBF to be fully adaptable to a subject's respiratory pattern. Images of the thoracic aorta acquired using balanced steady-state free precession with continuously adaptive windowing strategy respiratory motion control, with and without rBF, were compared in 10 healthy subjects. Total scan time was reduced by using rBF. The mean scan time was reduced from 7 min 44 s (463 cardiac cycles, ±127cc) without rBF to 5 min 43 s (380 cardiac cycles, ±118cc) with the use of rBF (P < 0.05). Respiratory efficiency was increased from 45 without rBF to 56 with rBF (P < 0.01). Image quality was the same for both techniques (P = ns). In conclusion, rBF significantly improved respiratory efficiency and reduced acquisition duration without affecting image quality

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MR-imaging of the thoracic aorta: 3D-ECG- and respiratory-gated bSSFP imaging using the CLAWS algorithm versus contrast-enhanced 3D-MRA

Cited by 12 publications

References 14 publications

Left atrial volume quantification using cardiac MRI in atrial fibrillation: comparison of the Simpson’s method with biplane area-length, ellipse, and three-dimensional methods

Left atrial volume quantification using cardiac MRI in atrial fibrillation: comparison of the Simpson’s method with biplane area-length, ellipse, and three-dimensional methods

Congenital anomalies of the aortic arch

Use of respiratory biofeedback and CLAWS for increased navigator efficiency for imaging the thoracic aorta

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