Multistage three‐dimensional UTE lung imaging by image‐based self‐gating

Tibiletti, Marta; Paul, Jan; Bianchi, Andrea; Wundrak, Stefan; Rottbauer, Wolfgang; Stiller, Detlef; Rasche, Volker

doi:10.1002/mrm.25673

Cited by 41 publications

(63 citation statements)

References 35 publications

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“…However, there was substantial disagreement for subjects with irregular breathing patterns (Cases 1,2,5,6) as indicated by lower correlation coefficients. Similar results across cases were observed in the diaphragm sharpness of soft-gating L1-ESPIRiT reconstructed images, as measured by the maximum derivative metric (27). For the subjects with regular breathing patterns (Cases 4,7,8), the different respiration estimation methods resulted in similar sharpness measures.…”

Section: Resultssupporting

confidence: 71%

Motion robust high resolution 3D free‐breathing pulmonary MRI using dynamic 3D image self‐navigator

Jiang

Ong

Johnson

et al. 2017

Magnetic Resonance in Med

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Section: Resultssupporting

confidence: 71%

Motion robust high resolution 3D free‐breathing pulmonary MRI using dynamic 3D image self‐navigator

Jiang

Ong

Johnson

et al. 2017

Magnetic Resonance in Med

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“…To assess the performance of the motion suppression technique, the sharpness of the transition at the lung‐liver interface was quantified by computing the normalized maximum of the first derivative (MD) on the 4 reconstructed respiratory frames. The maximum of the first derivative was computed along 21 vertical profiles going through the lung‐liver interface and the value measured in each profile was normalized to the value measured in the corresponding profiles of the motion corrupted datasets.…”

Section: Methodsmentioning

confidence: 99%

A black‐blood ultra‐short echo time (UTE) sequence for 3D isotropic resolution imaging of the lungs

Delacoste

Feliciano

Yerly

et al. 2019

Magnetic Resonance in Med

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Purpose Ultra‐short echo time MRI is a promising alternative to chest CT for cystic fibrosis patients. Black‐blood imaging in particular could help discern small‐sized anomalies, such as mucoid plugging, which may otherwise be confused with neighboring blood vessels, particularly when contrast agent is not used. We, therefore, implemented and tested an ultra‐short echo time sequence with black‐blood preparation. Additionally, this sequence may also be used to generate bright‐blood angiograms. Methods Using this sequence, data was acquired during free breathing in 10 healthy volunteers to obtain respiratory‐motion‐resolved 3D volumes covering the entire thorax with an isotropic resolution of (1 mm)3. The magnitude of signal suppression relative to a bright‐blood reference acquisition was quantified and compared with that obtained with a turbo‐spin echo (TSE) acquisition. Bright‐blood angiograms were also generated by subtraction. Finally, an initial feasibility assessment was performed in 2 cystic fibrosis patients, and images were visually compared with contrast‐enhanced images and with CT data. Results Black‐blood preparation significantly decreased the average normalized signal intensity in the vessel lumen (−66%; P < 0.001). Similarly, blood signal was significantly lowered (−60%; P = 0.001) compared with the TSE acquisition. In patients, mucoid plugging could be emphasized in the black‐blood datasets. An intercostal artery could also be visualized in the subtraction angiograms. Conclusion Black‐blood free‐breathing ultra‐short echo time imaging was successfully implemented and motion‐resolved full volumetric coverage of the lungs with high spatial resolution was achieved, while obtaining an angiogram without contrast agent injection. Encouraging initial results in patients prompt further investigations in a larger cohort.

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“…Procedure tolerance was evaluated by the volunteers using an analog scale with the following values: 1 = inacceptable, 2 = bad, 3 = good, 4 = very good, 5 = excellent. In addition, the delineation of the lung-liver interface was quantified in the ultra-short echo time images by measuring the normalized maximum of the first derivative (MD) [11]. This measure is defined such that values greater than 1 indicate an improvement in image sharpness under prolonged thoracic stabilization relative to free breathing acquisition.…”

Section: Methodsmentioning

confidence: 99%

Chest-MRI under pulsatile flow ventilation: A new promising technique

et al. 2017

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ObjectivesMagnetic resonance imaging (MRI) of the chest has long suffered from its sensitivity to respiratory and cardiac motion with an intrinsically low signal to noise ratio and a limited spatial resolution. The purpose of this study was to perform chest MRI under an adapted non invasive pulsatile flow ventilation system (high frequency percussive ventilation, HFPV®) allowing breath hold durations 10 to 15 times longer than other existing systems.MethodsOne volunteer and one patient known for a thymic lesion underwent a chest MRI under ventilation percussion technique (VP-MR). Routinely used sequences were performed with and without the device during three sets of apnoea on inspiration.ResultsVP-MR was well tolerated in both cases. The mean duration of the thoracic stabilization was 10.5 min (range 8.5–12) and 5.8 min (range 5–6.2) for Volunteer 1 and Patient 1, respectively. An overall increased image quality was seen under VP-MR with a better delineation of the mediastinal lesion for Patient 1. Nodules discovered in Volunteer 1 were confirmed with low dose CT.ConclusionVP-MR was feasible and increased spatial resolution of chest MRI by allowing acquisition at full inspiration during thoracic stabilization approaching prolonged apnoea. This new technique could be of benefit to numerous thoracic disorders.

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Multistage three‐dimensional UTE lung imaging by image‐based self‐gating

Abstract: Image-based respiratory self gating in UTE 3D lung images allows successful retrospective respiratory gating, also enabling reconstruction of intermediate respiratory stages.

Cited by 41 publications

References 35 publications

Motion robust high resolution 3D free‐breathing pulmonary MRI using dynamic 3D image self‐navigator

Motion robust high resolution 3D free‐breathing pulmonary MRI using dynamic 3D image self‐navigator

A black‐blood ultra‐short echo time (UTE) sequence for 3D isotropic resolution imaging of the lungs

Chest-MRI under pulsatile flow ventilation: A new promising technique

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