Evaluation of Balanced Steady-State Free Precession (TrueFISP) and K-space Segmented Gradient Echo Sequences for 3D Coronary MR Angiography with Navigator Gating at 3 Tesla

Kaul, Michael; Stork, Alexander; Bansmann, P. M.; Nolte-Ernsting, C.; Lund, Gunnar; Weber, Christoph; Adam, G.

doi:10.1055/s-2004-813629

Cited by 45 publications

(34 citation statements)

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“…Another aspect is dark stripe ("banding") artefacts [11,14], which may increase with higher field strength in steady-state acquisitions [12,13] because these sequences are sensitive to off-resonance frequency effects caused by magnetic field nonuniformties. To shift those artefacts out of the main region of interest, an off-resonance frequency shift was integrated in the 3.0-T sequence without examination time prolongation.…”

Section: Discussionmentioning

confidence: 99%

“…This was done by direct visual comparison of the 1.5-T B-FFE MR images and the corresponding 3.0-T MR images. Furthermore, we introduced an off-resonance frequency shift at 3.0 T to shift dark stripe ("banding") artefacts [11][12][13][14][15] out of the anatomical region of interest (pelvic floor).…”

Section: Mr Imaging Techniquementioning

confidence: 99%

“…This enabled a reduction of TR at 3.0 T to 3.28 ms (4.1 ms at 1.5 T). At 3.0 T [11,12], an off-resonance frequency shift was applied (optimal value was 50 Hz). In addition, bandwidth was increased at 3.0 T to 1,620.2 Hz (462 Hz at 1.5 T).…”

Section: Mr Imaging Techniquementioning

confidence: 99%

“…Furthermore, both readers (JG, NM) evaluated (independent analysis) if in the clinical setting dark stripe ("banding") artefacts [11][12][13][14][15] were present in the region of the pelvic floor.…”

Section: Image Analysismentioning

confidence: 99%

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Dynamic pelvic floor MR imaging at 3 T in patients with clinical signs of urinary incontinence-preliminary results

et al. 2008

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To prospectively evaluate feasibility, image quality and diagnostic accuracy of dynamic MR imaging the pelvic floor at 3.0 T in patients with urinary incontinence and to compare these results with those of MRI performed at 1.5 T. Ten patients with the diagnosis of urinary incontinence (clinical symptoms, clinical examination, pelvic ultrasound) were examined with a dynamic balanced FFE (B-FFE) sequence at 1.5 T and 3.0 T on the same day in a randomized order. Spatial (1.5 x 1.5 x 8 mm) and temporal (0.44 s) resolution at 3.0 T were comparable to the 1.5-T B-FFE sequence. Two radiologists assessed visual signal to noise (three-point scale), artefact level (five-point scale) and final MR diagnoses with regard to pelvic floor weakness (independent analysis). The diagnoses obtained at 1.5-T field strength and the results of the clinical tests served as standard of reference. In addition, ROI-based quantitative measurements were performed to assess different tissue contrasts at both field strengths. Data were analyzed for statistical differences by using the Wilcoxon's matched pairs test and the marginal homogeneity test. Visual signal to noise was rated higher at 3.0 T for all ten studies by both radiologists. With regard to artefact level, there was no statistically significant difference between the studies obtained at 3.0 T as compared to the corresponding 1.5-T studies (marginal homogeneity test: p = 0.18 for reviewer 1 and 0.41 for reviewer 2). Mean artefact level was rated minor to moderate by both reviewers for both field strengths (excellent interobserver agreement with Kendall-W value of 0.973). Except for a higher tissue contrast between fat and urethra at 1.5 T, there were no statistically significant differences between tissue contrast at 1.5 T as compared to 3.0 T (Wilcoxon's test). Final MR diagnoses regarding pelvic floor weakness did not differ between 3.0-T and 1.5-T field strength and correlated well with the results of the clinical tests. Dynamic pelvic floor MR imaging is feasible at 3.0 T. Our preliminary data indicate that evaluation of pelvic floor disease seems to be possible with 3.0 T equally well as compared to 1.5 T.

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Section: Discussionmentioning

confidence: 99%

Section: Mr Imaging Techniquementioning

confidence: 99%

Section: Mr Imaging Techniquementioning

confidence: 99%

Section: Image Analysismentioning

confidence: 99%

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Dynamic pelvic floor MR imaging at 3 T in patients with clinical signs of urinary incontinence-preliminary results

et al. 2008

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“…Better suited for device tracking in endovascular interventions are gradient imaging techniques [steady-state fast precession (SSFP) techniques, TrueFISP, FIESTA or balanced fast field echo], which in combination with contrast enhancement provide a high SNR and increased speed with a short TR, allow improved projection of vessels and its surrounding tissue with high signal and contrast [32,33].…”

Section: Essentials Of Mr Angiography In Endovascular Interventionsmentioning

confidence: 99%

MR-guided endovascular interventions: a comprehensive review on techniques and applications

et al. 2007

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The magnetic resonance (MR) guidance of endovascular interventions is probably one of the greatest challenges of clinical MR research. MR angiography is not only an imaging tool for the vasculature but can also simultaneously depict high tissue contrast, including the differentiation of the vascular wall and perivascular tissues, as well as vascular function. Several hurdles had to be overcome to allow MR guidance for endovascular interventions. MR hardware and sequence design had to be developed to achieve acceptable patient access and to allow real-time or near real-time imaging. The development of interventional devices, both applicable and safe for MR imaging (MRI), was also mandatory. The subject of this review is to summarize the latest developments in real-time MRI hardware, MRI, visualization tools, interventional devices, endovascular tracking techniques, actual applications and safety issues.

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Coronary magnetic resonance angiography

Stuber

Weiss

2007

Magnetic Resonance Imaging

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Coronary magnetic resonance angiography (MRA) is a powerful noninvasive technique with high soft-tissue contrast for the visualization of the coronary anatomy without X-ray exposure. Due to the small dimensions and tortuous nature of the coronary arteries, a high spatial resolution and sufficient volumetric coverage have to be obtained. However, this necessitates scanning times that are typically much longer than one cardiac cycle. By collecting image data during multiple RR intervals, one can successfully acquire coronary MR angiograms. However, constant cardiac contraction and relaxation, as well as respiratory motion, adversely affect image quality. Therefore, sophisticated motion-compensation strategies are needed. Furthermore, a high contrast between the coronary arteries and the surrounding tissue is mandatory. In the present article, challenges and solutions of coronary imaging are discussed, and results obtained in both healthy and diseased states are reviewed. This includes preliminary data obtained with state-of-the-art techniques such as steady-state free precession (SSFP), whole-heart imaging, intravascular contrast agents, coronary vessel wall imaging, and high-field imaging. Simultaneously, the utility of electron beam computed tomography (EBCT) and multidetector computed tomography (MDCT) for the visualization of the coronary arteries is discussed.

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Evaluation of Balanced Steady-State Free Precession (TrueFISP) and K-space Segmented Gradient Echo Sequences for 3D Coronary MR Angiography with Navigator Gating at 3 Tesla

Abstract: The conventional TFE technique has demonstrated good feasibility for cMRA at 3T. In its operational availability at 3T, the b-TFE sequence is inferior to the TFE sequence.

Cited by 45 publications

References 0 publications

Dynamic pelvic floor MR imaging at 3 T in patients with clinical signs of urinary incontinence-preliminary results

Dynamic pelvic floor MR imaging at 3 T in patients with clinical signs of urinary incontinence-preliminary results

MR-guided endovascular interventions: a comprehensive review on techniques and applications

Coronary magnetic resonance angiography

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