Camera-based respiratory triggering improves the image quality of 3D magnetic resonance cholangiopancreatography

Harder, F; Lohöfer, Fabian; Kaissis, Georgios; Zoellner, Christoph; Kamal, Omar; Katemann, Christoph; Höck, A.; Sénégas, Julien; Peeters, Johannes M.; Rummeny, Ernst J.; Karampinos, Dimitrios C.; Braren, Rickmer

doi:10.1016/j.ejrad.2019.108675

Cited by 11 publications

(10 citation statements)

References 24 publications

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“…Certain limitations of this study should be acknowledged: Firstly, the sample size was quite small yet comparable to that of other studies assessing the clinical feasibility of sequences [1,19,21,22,30,31]. Specifically, due to the limited sample size, certain pathologies only appeared very rarely (i.e.…”

Section: Plos Onementioning

confidence: 83%

“…Two sequences had an identical geometric resolution (voxel size: 0.82 x 0.82 x 1.2 mm 3 ); First the Cartesian CS 3.5 sequence (used routinely at our and other institutions [9]) relying on the Compressed SENSE acceleration technique with a variable density Poisson disk-sampling scheme followed by iterative reconstruction (Compressed SENSE factor 3.5, scan duration 03:06 min). Details concerning the Compressed SENSE technique can be found elsewhere [13,19,20,21,22,23]. Second a prototypical non-Cartesian Spiral-TOF (abbreviated Spiral) based on a stack of spirals with an in-plane spiral-out readout scheme (spiral interleaves 27, spiral acquisition window 10 ms, scan duration 01:32 min).…”

Section: Mr Imagingmentioning

confidence: 99%

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Clinical feasibility of ultrafast intracranial vessel imaging with non-Cartesian spiral 3D time-of-flight MR angiography at 1.5T: An intra-individual comparison study

Sartoretti

Schwenk

et al. 2020

PLoS ONE

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Section: Plos Onementioning

confidence: 83%

Section: Mr Imagingmentioning

confidence: 99%

Clinical feasibility of ultrafast intracranial vessel imaging with non-Cartesian spiral 3D time-of-flight MR angiography at 1.5T: An intra-individual comparison study

Sartoretti

Schwenk

et al. 2020

PLoS ONE

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“…Harder et al compared the same camera type and setup (abdominal imaging) to existing respiratory gating methods and reported that camera-based respiratory triggering (prospective gating) significantly improved image quality of 3D cholangiopancreatography images compared to conventional respiratory belt triggering. 21 Limitations Firstly, this study was retrospective and did not include other respiratory gating techniques or flow measurement references as additional comparisons. A simultaneous signal acquisition of a respiratory belt in combination with self-gating would have provided additional information on optimal respiratory gating.…”

Section: Discussionmentioning

confidence: 99%

“…Harder et al compared the same camera type and setup (abdominal imaging) to existing respiratory gating methods and reported that camera‐based respiratory triggering (prospective gating) significantly improved image quality of 3D cholangiopancreatography images compared to conventional respiratory belt triggering. 21 …”

Section: Discussionmentioning

confidence: 99%

“…This gating technique is easy to use as it requires no additional manual steps such as belt placement or sequence planning and can be used for prospective or retrospective triggering. Harder et al have demonstrated improved image quality in abdominal MRI with prospective camera‐based respiratory gating compared to belt‐based respiratory gating, 21 which evoked the questions of how this technique performs in 4D flow MRI.…”

mentioning

confidence: 99%

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Retrospective Camera‐Based Respiratory Gating in Clinical Whole‐Heart 4D Flow MRI

Gottwald

Blanken

Tourais

et al. 2021

Magnetic Resonance Imaging

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Background: Respiratory gating is generally recommended in 4D flow MRI of the heart to avoid blurring and motion artifacts. Recently, a novel automated contact-less camera-based respiratory motion sensor has been introduced. Purpose: To compare camera-based respiratory gating (CAM) with liver-lung-navigator-based gating (NAV) and no gating (NO) for whole-heart 4D flow MRI. Study Type: Retrospective. Subjects: Thirty two patients with a spectrum of cardiovascular diseases. Field Strength/Sequence: A 3T, 3D-cine spoiled-gradient-echo-T1-weighted-sequence with flow-encoding in three spatial directions. Assessment: Respiratory phases were derived and compared against each other by cross-correlation. Three radiologists/ cardiologist scored images reconstructed with camera-based, navigator-based, and no respiratory gating with a 4-point Likert scale (qualitative analysis). Quantitative image quality analysis, in form of signal-to-noise ratio (SNR) and liver-lungedge (LLE) for sharpness and quantitative flow analysis of the valves were performed semi-automatically. Statistical Tests: One-way repeated measured analysis of variance (ANOVA) with Wilks's lambda testing and follow-up pairwise comparisons. Significance level of P ≤ 0.05. Krippendorff's-alpha-test for inter-rater reliability. Results: The respiratory signal analysis revealed that CAM and NAV phases were highly correlated (C = 0.93 ± 0.09, P < 0.01). Image scoring showed poor inter-rater reliability and no significant differences were observed (P ≥ 0.16). The image quality comparison showed that NAV and CAM were superior to NO with higher SNR (P = 0.02) and smaller LLE (P < 0.01). The quantitative flow analysis showed significant differences between the three respiratory-gated reconstructions in the tricuspid and pulmonary valves (P ≤ 0.05), but not in the mitral and aortic valves (P > 0.05). Pairwise comparisons showed that reconstructions without respiratory gating were different in flow measurements to either CAM or NAV or both, but no differences were found between CAM and NAV reconstructions. Data Conclusion: Camera-based respiratory gating performed as well as conventional liver-lung-navigator-based respiratory gating. Quantitative image quality analysis showed that both techniques were equivalent and superior to no-gatingreconstructions. Quantitative flow analysis revealed local flow differences (tricuspid/pulmonary valves) in images of no-gating-reconstructions, but no differences were found between images reconstructed with camera-based and navigatorbased respiratory gating. Level of Evidence: 3 Technical Efficacy: Stage 2

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Recent Advances in Radio‐Frequency Coil Technologies: Flexible, Wireless, and Integrated Coil Arrays

Darnell

Truong

Song

2021

Magnetic Resonance Imaging

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Radio-frequency (RF) coils are to magnetic resonance imaging (MRI) scanners what eyes are to the human body. Because of their critical importance, there have been constant innovations driving the rapid development of RF coil technologies. Over the past four decades, the breadth and depth of the RF coil technology evolution have far exceeded the space allowed for this review article. However, these past developments have laid the very foundation on which some of the recent technical breakthroughs are built upon. Here, we narrow our focus on some of the most recent RF coil advances, specifically, on flexible, wireless, and integrated coil arrays. To provide a detailed review, we discuss the theoretical underpinnings, experimental implementations, promising results, as well as future outlooks covering these exciting topics. These recent innovations have greatly improved patient comfort and ease of scan, while also increasing the signal-to-noise ratio, image resolution, temporal throughput, and diagnostic and treatment accuracy. Together with advances in other MRI subfields, they will undoubtedly continue to drive the field forward and lead us to an ever more exciting future. Level of Evidence: 5 Technical Efficacy: Stage 1

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Camera-based respiratory triggering improves the image quality of 3D magnetic resonance cholangiopancreatography

Cited by 11 publications

References 24 publications

Clinical feasibility of ultrafast intracranial vessel imaging with non-Cartesian spiral 3D time-of-flight MR angiography at 1.5T: An intra-individual comparison study

Clinical feasibility of ultrafast intracranial vessel imaging with non-Cartesian spiral 3D time-of-flight MR angiography at 1.5T: An intra-individual comparison study

Retrospective Camera‐Based Respiratory Gating in Clinical Whole‐Heart 4D Flow MRI

Recent Advances in Radio‐Frequency Coil Technologies: Flexible, Wireless, and Integrated Coil Arrays

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