Looping Star

Menini, Anne; Solana, Ana Beatriz

doi:10.1002/mrm.27440

Cited by 30 publications

(43 citation statements)

References 76 publications

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“…Previous studies have used RUFIS for silent imaging including

T_{2}

‐prepared fMRI, and structural imaging at 3T and 7T . Another silent ZTE sequence is Looping Star which uses gradient echoes for

T_{2}^{*}

weighted imaging . Our acoustic noise measurement showed no measurable increase in the sound pressure levels during RUFIS scanning compared to background noise levels, similar to Alibek et al However, the quoted decibel values will differ depending on the scan room environment and are not necessarily what the subject would experience inside the scanner.…”

Section: Discussionsupporting

confidence: 76%

Silent T₁ mapping using the variable flip angle method with B₁ correction

Ljungberg

Wood

Solana

et al. 2020

Magnetic Resonance in Med

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Purpose: To compare the silent rotating ultrafast imaging sequence (RUFIS) to a traditional Cartesian spoiled gradient-echo (SPGR) acquisition scheme for variable flip angle (VFA) T 1 mapping. Methods: A two-point VFA measurement was performed using RUFIS and Cartesian SPGR in a quantitative phantom and healthy volunteers. To correct for B 1 errors, a novel silent magnetization prepared B 1 map acquisition (SIMBA) was developed, which combined with RUFIS VFA allows for a completely silent T 1 mapping protocol. Results: The silent protocol was found to have comparable repeatability but higher reproducibility in vivo compared to the standard SPGR protocol, and showed no increase in acoustic noise levels above background noise levels compared to a 33 dBA increase for the SPGR acquisition. Conclusions: VFA T 1 mapping using RUFIS is a feasible alternative to SPGR, achieving silent T 1 mapping with comparable acquisition time. K E Y W O R D ST 1 , MRI, quantitative, silent, ZTE

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“…Previous studies have used RUFIS for silent imaging including

T_{2}

‐prepared fMRI, and structural imaging at 3T and 7T . Another silent ZTE sequence is Looping Star which uses gradient echoes for

T_{2}^{*}

Section: Discussionsupporting

confidence: 76%

Silent T₁ mapping using the variable flip angle method with B₁ correction

Ljungberg

Wood

Solana

et al. 2020

Magnetic Resonance in Med

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“…This way, the ipZTE method inherits the advantages of standard ZTE. The segmented structure is also compatible with adding additional magnetization preparation pulses like inversion‐recovery preparation or T 2 preparation and novel

T_{2}^{*}

refocusing methods …”

Section: Discussionmentioning

confidence: 99%

“…The segmented structure is also compatible with adding additional magnetization preparation pulses like inversion-recovery preparation or T 2 preparation and novel T * 2 refocusing methods. [20][21][22][23][24]33,34…”

Section: Discussionmentioning

confidence: 99%

In‐phase zero TE musculoskeletal imaging

Engström

McKinnon²,

Cozzini

2019

Magnetic Resonance in Med

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Purpose To introduce a new method for in‐phase zero TE (ipZTE) musculoskeletal MR imaging. Methods ZTE is a 3D radial imaging method, which is sensitive to chemical shift off‐resonance signal interference, especially around fat–water tissue interfaces. The ipZTE method addresses this fat–water chemical shift artifact by acquiring each 3D radial spoke at least twice with varying readout gradient amplitude and hence varying effective sampling time. Using k‐space‐based chemical shift decomposition, the acquired data is then reconstructed into an in‐phase ZTE image and an out‐of‐phase disturbance. Results The ipZTE method was tested for knee, pelvis, brain, and whole‐body. The obtained images demonstrate exceptional soft‐tissue uniformity free from out‐of‐phase disturbances apparent in the original ZTE images. The chemical shift decomposition was found to improve SNR at the cost of reduced image resolution. Conclusion The ipZTE method can be used as an averaging mechanism to eliminate fat–water chemical shift artifacts and improve SNR. The method is expected to improve ZTE‐based musculoskeletal imaging and pseudo CT conversion as required for PET/MR attenuation correction and MR‐guided radiation therapy planning.

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“…To address these issues, we present the application of a recently developed silent pulse sequence known as Looping Star (Wiesinger, Menini, & Solana, 2019). This technique could mitigate the need for earplugs, improve accessibility to the scanning environment and remove the acoustic noise confound.…”

Section: Introductionmentioning

confidence: 99%

“…Looping Star (LS) is based on a technique known as Rotating Ultra‐Fast Imaging Sequence (RUFIS) (Madio & Lowe, 1995), which reduces the effect of vibrations induced by gradient switching by making small incremental changes in the direction (but not the amplitude) of the frequency encoding gradients of the readout. Looping Star is a modification of RUFIS in which a temporal‐multiplexed gradient refocusing mechanism is employed (Wiesinger et al, 2019), allowing the transverse component of the magnetisation to evolve by returning periodically to the centre of k‐space. As a result, it remains sensitive to static T 2 * dephasing as in GRE‐EPI and can achieve multi‐echo acquisition without the need for magnetisation preparation pulses (Solana, Menini, Sacolick, Hehn, & Wiesinger, 2016).…”

Section: Introductionmentioning

confidence: 99%

Revealing the mechanisms behind novel auditory stimuli discrimination: An evaluation of silent functional MRI using looping star

Damestani

O’Daly

Solana

et al. 2021

Human Brain Mapping

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Looping Star is a near‐silent, multi‐echo, 3D functional magnetic resonance imaging (fMRI) technique. It reduces acoustic noise by at least 25dBA, with respect to gradient‐recalled echo echo‐planar imaging (GRE‐EPI)‐based fMRI. Looping Star has successfully demonstrated sensitivity to the cerebral blood‐oxygen‐level‐dependent (BOLD) response during block design paradigms but has not been applied to event‐related auditory perception tasks. Demonstrating Looping Star's sensitivity to such tasks could (a) provide new insights into auditory processing studies, (b) minimise the need for invasive ear protection, and (c) facilitate the translation of numerous fMRI studies to investigations in sound‐averse patients. We aimed to demonstrate, for the first time, that multi‐echo Looping Star has sufficient sensitivity to the BOLD response, compared to that of GRE‐EPI, during a well‐established event‐related auditory discrimination paradigm: the “oddball” task. We also present the first quantitative evaluation of Looping Star's test–retest reliability using the intra‐class correlation coefficient. Twelve participants were scanned using single‐echo GRE‐EPI and multi‐echo Looping Star fMRI in two sessions. Random‐effects analyses were performed, evaluating the overall response to tones and differential tone recognition, and intermodality analyses were computed. We found that multi‐echo Looping Star exhibited consistent sensitivity to auditory stimulation relative to GRE‐EPI. However, Looping Star demonstrated lower test–retest reliability in comparison with GRE‐EPI. This could reflect differences in functional sensitivity between the techniques, though further study is necessary with additional cognitive paradigms as varying cognitive strategies between sessions may arise from elimination of acoustic scanner noise.

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Looping Star

Abstract: Looping Star imaging provides new and exciting opportunities for fast, robust and yet quiet T2* MR imaging. Potential applications include T2-weighted imaging, T2 mapping, QSM, and fMRI.

Cited by 30 publications

References 76 publications

Silent T₁ mapping using the variable flip angle method with B₁ correction

Silent T₁ mapping using the variable flip angle method with B₁ correction

In‐phase zero TE musculoskeletal imaging

Revealing the mechanisms behind novel auditory stimuli discrimination: An evaluation of silent functional MRI using looping star

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Looping Star

Abstract: Looping Star imaging provides new and exciting opportunities for fast, robust and yet quiet T2* MR imaging. Potential applications include T2*-weighted imaging, T2* mapping, QSM, and fMRI.

Cited by 30 publications

References 76 publications

Silent T1 mapping using the variable flip angle method with B1 correction

Silent T1 mapping using the variable flip angle method with B1 correction

In‐phase zero TE musculoskeletal imaging

Revealing the mechanisms behind novel auditory stimuli discrimination: An evaluation of silent functional MRI using looping star

Contact Info

Product

Resources

About

Abstract: Looping Star imaging provides new and exciting opportunities for fast, robust and yet quiet T2* MR imaging. Potential applications include T2-weighted imaging, T2 mapping, QSM, and fMRI.

Silent T₁ mapping using the variable flip angle method with B₁ correction

Silent T₁ mapping using the variable flip angle method with B₁ correction