Extrinsic multiecho phase-contrast SSFP: evaluation on cardiac output measurements

Rolf, Marijn P.; Hofman, Mark B.M.; Kuijer, Joost P.A.; Pai, Vinay; Greiser, Andreas; Rossum, Albert C. van; Heethaar, R.M.

doi:10.1016/j.mri.2008.07.006

Cited by 2 publications

(4 citation statements)

References 25 publications

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“…In particular, image acquisition using a 3D technique takes longer than using a 2D technique. Many researchers have studied the problem wherein shortening the acquisition time 3D PC MRA is directly related to a decrease in temporal resolution (Markl et al, 2003;Pai, 2007;Rolf et al, 2009;Velikina et al, 2010;Chang et al, 2011). Most of these studies can be divided into two approaches, specifically modification of hardware and altering the software.…”

Section: Discussionmentioning

confidence: 99%

“…On the other hand, 3D PC MRA has a special advantage for venous observation, as the veins are slower moving than other vessels in the body, and this technique can be used to control the area values of the velocity encoding gradients. Due to this advantage, therefore, a wide variety of techniques have recently been proposed to improve the temporal resolution of 3D PC MRA (Markl et al, 2003;Pai, 2007;Rolf et al, 2009;Velikina et al, 2010;Chang et al, 2011). As a part of the pulse sequence and k-space trajectory methods, steady-state free precession (SSFP) sequence, parallel imaging, and non-Cartesian k-space trajectory are typical examples of techniques for PC MRA in which the temporal resolution has been improved (Markl et al, 2003;Pai, 2007;Rolf et al, 2009;Velikina et al, 2010;Chang et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

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Keyhole‐3D phase contrast magnetic resonance angiography: A time‐resolved reconstruction method

Lee

Hong

Lee

et al. 2014

Int J Imaging Syst Tech

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In this study, we studied the keyhole imaging technique to 3D Phase‐contrast magnetic resonance angiography (PC MRA) to improve its temporal resolution. Previously, our research group has already studied the 2D PC MRA combined with keyhole technique, and evaluated the applicability. For keyhole‐3D PC MRA, the keyhole factor was used from 12.5% to 50% of the full k‐space. With keyhole factors above 50%, the images were similar to the original image and the vessels in the brain were well observed. We believe the keyhole‐3D PC MRA will give some advantages for improving the temporal resolution of MR systems.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Keyhole‐3D phase contrast magnetic resonance angiography: A time‐resolved reconstruction method

Lee

Hong

Lee

et al. 2014

Int J Imaging Syst Tech

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“…The sequence might very well be used for other flow quantification purposes in the heart. In locations where there is enough inflow of unsaturated spins, such as the aorta, the gain in CNR is not expected to be significant (19, 39, 40).…”

Section: Discussionmentioning

confidence: 99%

“…Using this method, the increase in TR would affect temporal resolution and artifact sensitivity, as was pointed out by Santini et al (18). The method proposed by Pai (17) is not suitable due to its sensitivity to artifacts (19). Therefore, we have chosen to use the PC technique described by Overall et al (16).…”

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confidence: 99%

3D velocity quantification in the heart: Improvements by 3D PC‐SSFP

Rolf

Hofman

Kuijer

et al. 2009

Magnetic Resonance Imaging

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Purpose: To test whether a 3D imaging sequence with phase contrast (PC) velocity encoding based on steadystate free precession (SSFP) improves 3D velocity quantification in the heart compared to the currently available gradient echo (GE) approach. Materials and Methods:The 3D PC-SSFP sequence with 1D velocity encoding was compared at the mitral valve in 12 healthy subjects with 3D PC-GE at 1.5T. Velocity measurements, velocity-to-noise-ratio efficiency (VNR eff ), intra-and interobserver variability of area and velocity measurements, contrast-to-noise-ratio (CNR), and artifact sensitivity were evaluated in both long-and short-axis orientation.Results: Descending aorta mean and peak velocities correlated well (r 2 ¼ 0.79 and 0.93) between 3D PC-SSFP and 3D PC-GE. At the mitral valve, mean velocity correlation was moderate (r 2 ¼ 0.70 short axis, 0.56 long axis) and peak velocity showed good correlation (r 2 ¼ 0.94 short axis, 0.81 long axis). In some cases VNR eff was higher, in others lesser, depending on slab orientation and cardiac phase. Intra-and interobserver variability was generally better for 3D PC-SSFP. CNR improved significantly, especially at end systole. Artifact levels did not increase.Conclusion: 3D SSFP velocity quantification was successfully tested in the heart. Blood-myocardium contrast improved significantly, resulting in more reproducible velocity measurements for 3D PC-SSFP at 1.5T.

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Extrinsic multiecho phase-contrast SSFP: evaluation on cardiac output measurements

Cited by 2 publications

References 25 publications

Keyhole‐3D phase contrast magnetic resonance angiography: A time‐resolved reconstruction method

Keyhole‐3D phase contrast magnetic resonance angiography: A time‐resolved reconstruction method

3D velocity quantification in the heart: Improvements by 3D PC‐SSFP

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