Improved ejection fraction and flow velocity estimates with use of view sharing and uniform repetition time excitation with fast cardiac techniques.

Foo, Thomas K.F.; Bernstein, Matt A.; Aisen, Alex M.; Hernández, Ramiro J.; Collick, Brace D.; Bernstein, Tsur

doi:10.1148/radiology.195.2.7724769

Cited by 184 publications

(113 citation statements)

References 0 publications

Supporting

Mentioning

111

Contrasting

Unclassified

Order By: Relevance

“…The acquisition of additional central k-space lines between adjacent peripheral k-space data kϩ and k- (Fig. 2), however, reduces temporal blurring compared to the original simple view sharing approach (19). Phase sharing is not possible for the reconstruction of the first cine frame of the cardiac cycle (Fig.…”

Section: Discussionmentioning

confidence: 99%

“…Temporal resolution of sequences 2 and 3 (protocols B and C) is improved by a modified view sharing technique called shared phases (19,20). Eight central kspace lines, for example, are measured in sequence protocol C for each cardiac phase to be reconstructed by acquiring additional central k-space views between adjacent peripheral k-space data kϩ and k-whereas peripheral k-space data from adjacent temporal phases are combined to generate intermediate data sets (20; Fig.…”

Section: Shared Phases Techniquementioning

confidence: 99%

“…Hence, more cardiac phases than originally sampled can be calculated. This sharing of peripheral k-space data between phases for image reconstruction is similar to shifting the acquisition window for a kspace segment (19). The resulting apparent or effective temporal resolution is thus defined as the interval between the read-out of these central k-space lines (20).…”

Section: Shared Phases Techniquementioning

confidence: 99%

See 2 more Smart Citations

Assessment of left ventricular function by breath‐hold cine MR imaging: Comparison of different steady‐state free precession sequences

Kunz

Oellig

Krummenauer

et al. 2005

Magnetic Resonance Imaging

View full text Add to dashboard Cite

Purpose:To compare steady-state free precession (SSFP) sequence protocols with different acquisition times (TA) and temporal resolutions (tRes) due to the implementation of a view sharing technique called shared phases for the assessment of left ventricular (LV) function by breath-hold cine magnetic resonance (MR) imaging. Materials and Methods:End-diastolic and end-systolic volumes (EDV, ESV) were measured in contiguous shortaxis slices with a thickness of 8 mm acquired in 10 healthy male volunteers. The following true fast imaging with steady-state precession (TrueFISP) sequence protocols were compared: protocol A) internal standard of reference, segmented: tRes 34.5 msec, TA 18 beats per slice; protocol B) segmented, shared phases: tRes 34.1 msec, TA 10 beats per slice; and protocol C) real-time, shared phases, parallel acquisition technique: tRes 47.3 msec, TA 24 beats for 12 slices covering the entire left ventricle. Results:Phase sharing leads to a significant decrease in EDV, stroke volume (SV), and ejection fraction (EF) (median difference -7.0 mL [*], -9.6 mL, and -3.4%, respectively, for protocol B; -15.3 mL, -13.3 mL, and -2.4% for protocol C; P ϭ 0.002, *P ϭ 0.021). The observed median difference of real-time EDV and SV estimates is of clinical relevance. Real-time cine MR imaging shows a greater variability of EDV and SV. No relevant differences in ESV were observed. Conclusion:The true cine frame duration of both shared phases sequence protocols exceeds the period of isovolumetric contraction (IVCT) of the left ventricle resulting in a systematic and significant underestimation of EDV and consequently SV and EF. SSFP sequence protocol parameters, particularly tRes and use of view sharing techniques, should therefore be known at follow-up examinations in order to be able to assess LV remodeling in patients with heart failure. CINE MAGNETIC RESONANCE (MR) imaging has beenshown to be the most accurate and reproducible method for the evaluation of cardiac ventricular volumes, function, and mass and is therefore regarded to be the standard of reference (1-4). Two different MR sequences are commonly used to assess cardiac function parameters non-invasively: segmented k-space turbo gradient echo (TGE) and steady-state free precession (SSFP) sequences.The accuracy of segmented k-space TGE sequences has been extensively evaluated, including animal experiments (5-8). The recently introduced SSFP sequences enable shorter acquisition times, allow higher in-plane resolutions, and provide better image quality (8,9). Their accuracy in determining left ventricular (LV) mass was also evaluated in animal experiments (10). Normal values were established for left and right ventricular volumes and function for both TGE as well as SSFP sequences, with SSFP sequences yielding significantly larger end-diastolic and end-systolic volumes (EDV and ESV, respectively) than TGE sequences (7,8,(11)(12)(13)(14)(15)(16)(17).Signal intensity in images acquired with SSFP sequences relies on T2/T1 ratio and does not depend on inflow...

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Shared Phases Techniquementioning

confidence: 99%

Section: Shared Phases Techniquementioning

confidence: 99%

See 1 more Smart Citation

Assessment of left ventricular function by breath‐hold cine MR imaging: Comparison of different steady‐state free precession sequences

Kunz

Oellig

Krummenauer

et al. 2005

Magnetic Resonance Imaging

View full text Add to dashboard Cite

show abstract

“…[3]) and the associated image reconstruction (Eq. [5]) by adding an index (0 Յ Յ T -1): data acquired at time t are F ជ , and the reconstructed image at this time point is f ជ . The entire reconstruction problem for all T time samples may be written as a single matrix inversion by concatenating all image vectors.…”

Section: Dynamic Imagingmentioning

confidence: 99%

“…One well known method for increasing the number of temporal frames in cine CMRI is view sharing (5). This temporal interpolation method, which is commercially available, reconstructs intermediate frames by combining the latter-acquired half of the data for a preceding frame with the earlier half of the data for the following frame.…”

mentioning

confidence: 99%

Noquist: Reduced field‐of‐view imaging by direct Fourier inversion

Moratal-Perez

Hong

Pettigrew

et al. 2004

Magnetic Resonance in Med

View full text Add to dashboard Cite

A novel technique called "Noquist" is introduced for the acceleration of dynamic cardiac magnetic resonance imaging (CMRI). With the use of this technique, a more sparsely sampled dynamic image sequence is reconstructed correctly, without Nyquist foldover artifact. Unlike most other reduced field-ofview (rFOV) methods, Noquist does not rely on data substitution or temporal interpolation to reconstruct the dynamic image sequence. The proposed method reduces acquisition time in dynamic MRI scans by eliminating the data redundancy associated with static regions in the dynamic scene. A reduction of imaging time is achieved by a fraction asymptotically equal to the static fraction of the FOV, by omitting acquisition of an appropriate subset of phase-encoding views from a conventional equidistant Cartesian acquisition grid. The theory behind this method is presented along with sample reconstructions from real and simulated data. Noquist is compared with conventional cine imaging by retrospective selection of a reduced data set from a full-grid conventional image sequence. In addition, a comparison is presented, using real and simulated data, of our technique with an existing rFOV technique that uses temporal interpolation. The experimental results confirm the theory, and demonstrate that Noquist reduces scan time for cine MRI while fully preserving both spatial and temporal resolution, but at the cost of a reduced signal-tonoise ratio (SNR). Magn Reson Med 51:331-342, 2004.

show abstract

Assessment of myocardial function and perfusion in a canine model of non-occlusive coronary artery stenosis using fast magnetic resonance imaging

Schwitter

Saeed

Wendland

et al. 1999

J. Magn. Reson. Imaging

View full text Add to dashboard Cite

Improved ejection fraction and flow velocity estimates with use of view sharing and uniform repetition time excitation with fast cardiac techniques.

Abstract: View sharing and uniform TR RF excitation improve the accuracy of end-systolic and end-diastolic ventricular volume measurements by improving the effective temporal resolution.

Cited by 184 publications

References 0 publications

Assessment of left ventricular function by breath‐hold cine MR imaging: Comparison of different steady‐state free precession sequences

Assessment of left ventricular function by breath‐hold cine MR imaging: Comparison of different steady‐state free precession sequences

Noquist: Reduced field‐of‐view imaging by direct Fourier inversion

Assessment of myocardial function and perfusion in a canine model of non-occlusive coronary artery stenosis using fast magnetic resonance imaging

Contact Info

Product

Resources

About