Fast phase‐contrast velocity measurement in the steady state

Overall, William R.; Nishimura, Dwight G.; Hu, B. L.

doi:10.1002/mrm.10285

Cited by 23 publications

(38 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…They are being used for different applications and have replaced older GRE sequences. Numerous studies have reported the advantageous applications of SSFP in cardiac imaging [13,14,15,23,24,25,26]. Newer developments also allow for the use of SSFP in viability diagnostics.…”

Section: Clinical Impact Of Mri First-pass Perfusionmentioning

confidence: 95%

Steady-state free precession sequences in myocardial first-pass perfusion MR imaging: comparison with TurboFLASH imaging

et al. 2004

View full text Add to dashboard Cite

The aim of this study was to compare the image quality of a saturation-recovery gradient-recalled echo (GRE; TurboFLASH) and a saturation-recovery SSFP (SR-TrueFISP) sequence for myocardial first-pass perfusion MRI. Eight patients with chronic myocardial infarction and 8 volunteers were examined with a TurboFLASH (TR 2.1 ms, TE 1 ms, FA 8 degrees ) and a SR-TrueFISP sequence (TR 2.1 ms, TE 0.9 ms, FA, 50 degrees ) on a 1.5 T scanner. During injection of 0.05 mmol/kg BW Gd-DTPA at 4 ml/s, three short axis slices (8 mm) of the left ventricle (LV) were simultaneously scanned during breath-hold. Maximum signal-to-noise ratio (SNR), contrast-to-noise ratio (CNR) between infarcted and normal myocardium, and percentage signal intensity change (PSIC) were measured within the LV lumen and in four regions of the LV myocardium for the three slices separately. For the LV lumen, SR-TrueFISP was superior in SNR and PSIC (factor 3.2 and 1.6, respectively). Mean maximum SNR, PSIC, and CNR during peak enhancement in the LV myocardium were higher for SR-TrueFISP compared with TurboFLASH (factor 2.4, 1.25, and 1.24, respectively). The SNR was higher in the septal portion of the ventricle than in anterior/posterior and lateral regions. The SR-TrueFISP provides higher SNR and improves image quality compared with TurboFLASH in first-pass myocardial perfusion MRI.

show abstract

Section: Clinical Impact Of Mri First-pass Perfusionmentioning

confidence: 95%

Steady-state free precession sequences in myocardial first-pass perfusion MR imaging: comparison with TurboFLASH imaging

et al. 2004

View full text Add to dashboard Cite

show abstract

“…Nevertheless, if these higher harmonics are clinically significant, they could be obtained either by reducing to twofold acceleration or by decreasing the TR. Because standard CINE PC measurements with TR as low as 6 ms can be made with a reasonable SNR (14), the fourfold acceleration approach could be performed with a cutoff frequency as high as 10.4 Hz, allowing approximately 10 harmonics to be obtained. Alternatively, if only four harmonics are of interest, a TR of 6 ms could conceivably be used in a 10-fold-accelerated protocol.…”

Section: Discussionmentioning

confidence: 99%

“…In terms of M and HR, this yields a Ͻ 1/͑4 TR M HR). [14] which reflects the maximum acceleration factor for obtaining M harmonics. Alternatively, a larger acceleration factor can be used if high-frequency velocity components occupy only a portion of space.…”

Section: Hp-lp Combined With Unfoldmentioning

confidence: 99%

High‐pass‐low‐pass (HP‐LP) reconstruction of CINE phase‐contrast MRI

Kerwin

2004

Magnetic Resonance in Med

View full text Add to dashboard Cite

A new interpretation of CINE phase-contrast (PC) MRI is presented in which flowing blood is shown to induce separate high-and low-temporal-frequency components in the resulting image sequence. The flow velocities can then be extracted from the ratio of these two components, independently of any unknown phase offset. This interpretation leads to new insights into improving temporal resolution, eliminating noise, and reducing acquisition time in PC imaging. A specific example explored in this article uses a technique related to unaliasing by Fourier-encoding the overlaps using the temporal dimension (UNFOLD) to acquire PC velocity measurements at 54 -68 time points in the cardiac cycle, all within a single breath-hold of <20 s. In experimental studies, these techniques were shown to yield improved signal-to-noise ratios (

show abstract

“…The conventional approach to flow quantification utilizes spoiled gradient echo (GE) imaging technique, which inherently has a limited signal-to-noise ratio (SNR) when applied with short repetition times. With the advent of faster gradient systems flow quantification with steady-state free precession (SSFP) sequences has become feasible, three different approaches were published by Overall et al [5], Markl et al [6] and Pai [7]. Advantages of SSFP are shorter acquisition times and higher SNR [8,9].…”

Section: Introductionmentioning

confidence: 97%