Comparison of Brain MR Images at 1.5T Using BLADE and Rectilinear Techniques for Patients Who Move during Data Acquisition

Nyberg, Eric; Sandhu, Gurpreet S.; Jesberger, John A.; Blackham, Kristine A; Hsu, Daniel P.; Griswold, Mark A.; Sunshine, Jeffrey L.

doi:10.3174/ajnr.a2737

Cited by 32 publications

(24 citation statements)

References 19 publications

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“…Susceptibility artifacts were most severe in DW ss‐EPI, and they were well suppressed in DW rs‐EPI. This was concordant with previous reports (Attenberger et al, ; Nyberg et al, ; Morelli et al, ). DW BLADE showed the best suppression of susceptibility artifacts but not the best CS.…”

Section: Discussionsupporting

confidence: 94%

“…Although previous reports have suggested a preference for DW BLADE over DW ss‐EPI due to the lack of bulk susceptibility artifacts (Attenberger et al, ; Fries et al, ), no benefit regarding the CS was observed for DW BLADE in our study. DW BLADE was designed to suppress susceptibility artifacts at the cost of acquisition time (Attenberger et al, ; Nyberg et al, ). Our results indicate the excellent suppression of susceptibility artifacts in DW BLADE (Table ).…”

Section: Discussionmentioning

confidence: 99%

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The usefulness of diffusion‐weighted readout‐segmented EPI and fast spin echo with BLADE (PROPELLER) k‐space sampling: A comparison with single‐shot EPI for diffusion‐weighted imaging in ischemic stroke patients

Jang

Ahn

Kim

et al. 2016

Int J Imaging Syst Tech

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We evaluated the value of diffusion-weighted readout-segmented EPI (DW rs-EPI) and diffusion-weighted fast spin echo images with BLADE (PROPELLER) k-space sampling (DW BLADE) in patients with ischemic stroke through intra-individual comparisons with diffusion-weighted single-shot EPI (DW ss-EPI). Forty-four patients with acute ischemic stroke who had undergone three different types of diffusion weighted imaging (DWI) (b = 1000 s/mm2) were included. Two reviewers assessed the three types of DWI for diagnostic confidence based on a five-point confidence score (CS). The inter- and intra-observer agreements for the CS were assessed. The DWI signal ratio to the contralateral normal area and the apparent diffusion coefficient (ADC) of DWI lesions were compared. The CSs of the three DWI methods were significantly different (P < 0.001). A post hoc analysis showed a significantly higher CS with DW rs-EPI than with DW ss-EPI (P = 0.022). There were significant increases in the CSs for DW rs-EPI compared to DW ss-EPI, for patients who underwent DWI within 24 h of symptom onset, and for patients with DWI lesions ≤ 50 mm2. The inter-observer and intra-observer agreements of the CS were good. DW rs-EPI increased the diagnostic confidence of ischemic stroke compared to DW ss-EPI, particularly for patients with small lesions and for those who underwent DWI within 24 h of symptom onset. DW BLADE showed a similar level of diagnostic confidence to DW ss-EPI

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Section: Discussionsupporting

confidence: 94%

Section: Discussionmentioning

confidence: 99%

The usefulness of diffusion‐weighted readout‐segmented EPI and fast spin echo with BLADE (PROPELLER) k‐space sampling: A comparison with single‐shot EPI for diffusion‐weighted imaging in ischemic stroke patients

Jang

Ahn

Kim

et al. 2016

Int J Imaging Syst Tech

View full text Add to dashboard Cite

show abstract

“… Within the sequences different technologies are available, for example 3D T 1 magnetization prepared rapid acquisition gradient echo (MPRAGE) or generalized autocalibrating partially parallel acquisitions (GRAPPA) (Lindholm et al, ), T 2 * gradient echo (GRE) or susceptibility weighted imaging (SWI) (de Souza et al, ), or conventional Cartesian or PROPELLER T 2 or FLAIR sequences (Nyberg ). …”

Section: Resultsmentioning

confidence: 99%

Proposal for a magnetic resonance imaging protocol for the detection of epileptogenic lesions at early outpatient stages

et al. 2013

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SUMMARYPurpose: Magnetic resonance imaging (MRI) is a key technology in the presurgical evaluation of patients with epilepsy. Already at early outpatient stages it can contribute to the identification of patients who are, in the case of pharmacoresistance, good candidates for epilepsy surgery. Yet, "standard head" MRI examinations often fail to displaying therapeutically relevant epileptogenic lesions. The purpose of this study is to identify an epilepsy-specific MRI protocol, which is likewise sensitive for even small epileptogenic lesions and economical enough to be applied outside specialized epilepsy centers. Methods: Based on a large European presurgical epilepsy program comprising 2,740 patients we identified the spectrum of common epileptogenic lesions and determine the set of MRI sequences that are required for their reliable detection. Relying on a series of small, therapeutically particularly relevant lesions we determined the required slices thickness, slice angulations, and orientations for an epilepsy-specific MRI protocol. Key Findings: Indispensable for early outpatient epilepsy specific MRI are fluid attenuated inversion recovery (FLAIR), T 2 -weighted, T 1 -weighted, and hemosiderin/calcification-sensitive sequences. Slice thickness for T 2 and FLAIR must not exceed 3 mm. The T 1 image should be acquired in three-dimensional technique at 1 mm isotropic voxels size. For T 2 and FLAIR, at least two slice orientations each must be demanded in hippocampal angulation. We suggest no adaption to a clinical focus hypothesis. The resulting "essential 6" sequence protocol allows the detection of virtually all common epileptogenic lesion entities. Significance: The creation of a broadly accepted and abundantly applied MRI protocol for epilepsy outpatients can contribute to improved and earlier identification of potential candidates for epilepsy surgery. Our systematic analysis of MRI requirements for the detection of epileptogenic lesions can serve as basis for protocol negotiations between epileptologists, radiologists, and health care funders.

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“…Given that other sequences were not affected, adaptation of motion artifact reducing techniques [16], [17] will help to further improve the value of T2-TSE-imaging at 7 T. T2-weighted TSE at 7 T exhibits high RF power deposition owing to the use of a train of refocusing RF pulses. We were able to acquire 20 slices per patient (superior-inferior [S-I] coverage: 7 cm), which can be considered sufficient, if the site of the lesion is known.…”

Section: Discussionmentioning

confidence: 99%

Ultrahigh-Field MRI in Human Ischemic Stroke – a 7 Tesla Study

et al. 2012

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IntroductionMagnetic resonance imaging (MRI) using field strengths up to 3 Tesla (T) has proven to be a powerful tool for stroke diagnosis. Recently, ultrahigh-field (UHF) MRI at 7 T has shown relevant diagnostic benefits in imaging of neurological diseases, but its value for stroke imaging has not been investigated yet. We present the first evaluation of a clinically feasible stroke imaging protocol at 7 T. For comparison an established stroke imaging protocol was applied at 3 T.MethodsIn a prospective imaging study seven patients with subacute and chronic stroke were included. Imaging at 3 T was immediately followed by 7 T imaging. Both protocols included T1-weighted 3D Magnetization-Prepared Rapid-Acquired Gradient-Echo (3D-MPRAGE), T2-weighted 2D Fluid Attenuated Inversion Recovery (2D-FLAIR), T2-weighted 2D Fluid Attenuated Inversion Recovery (2D-T2-TSE), T2* weighted 2D Fast Low Angle Shot Gradient Echo (2D-HemoFLASH) and 3D Time-of-Flight angiography (3D-TOF).ResultsThe diagnostic information relevant for clinical stroke imaging obtained at 3 T was equally available at 7 T. Higher spatial resolution at 7 T revealed more anatomical details precisely depicting ischemic lesions and periinfarct alterations. A clear benefit in anatomical resolution was also demonstrated for vessel imaging at 7 T. RF power deposition constraints induced scan time prolongation and reduced brain coverage for 2D-FLAIR, 2D-T2-TSE and 3D-TOF at 7 T versus 3 T.ConclusionsThe potential of 7 T MRI for human stroke imaging is shown. Our pilot study encourages a further evaluation of the diagnostic benefit of stroke imaging at 7 T in a larger study.

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Comparison of Brain MR Images at 1.5T Using BLADE and Rectilinear Techniques for Patients Who Move during Data Acquisition

Cited by 32 publications

References 19 publications

The usefulness of diffusion‐weighted readout‐segmented EPI and fast spin echo with BLADE (PROPELLER) k‐space sampling: A comparison with single‐shot EPI for diffusion‐weighted imaging in ischemic stroke patients

The usefulness of diffusion‐weighted readout‐segmented EPI and fast spin echo with BLADE (PROPELLER) k‐space sampling: A comparison with single‐shot EPI for diffusion‐weighted imaging in ischemic stroke patients

Proposal for a magnetic resonance imaging protocol for the detection of epileptogenic lesions at early outpatient stages

Ultrahigh-Field MRI in Human Ischemic Stroke – a 7 Tesla Study

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