Towards Routine Clinical Use of Radial Stack-of-Stars 3D Gradient-Echo Sequences for Reducing Motion Sensitivity

Block, Kai Tobias; Chandarana, Hersh; Milla, Sarah Sarvis; Bruno, Mary; Mulholland, Tom; Fatterpekar, Girish M.; Hagiwara, Mari; Grimm, Robert; Geppert, Christian; Kiefer, Berthold; Sodickson, Daniel K.

doi:10.13104/jksmrm.2014.18.2.87

Cited by 151 publications

(182 citation statements)

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“…A stack-of-stars technique is performed for in-plane sampling and Cartesian sampling is performed in the slice direction. 8 Due to the overlap of spokes in the centre, the distribution of k-space data along individual spokes is averaged out. Although robust in minimising aliasing, ghosting and motion artefacts, radial trajectories are prone to blurring and radial streak artefacts inherent to the sampling scheme.…”

Section: Discussionmentioning

confidence: 99%

“…5 Due to its lower motion sensitivity radial stack-ofstars acquisition allows a free-breathing T1W sequence that can aid in accurate tumour volume identification and delineation. 8 However, with the higher sampling requirement of k-space data, the stack-of-stars technique is limited by temporal resolution. Whilst a conventional T1W GRE sequence allows the entire thorax to be imaged in a 20 second (s) breath-hold, a radial GRE sequence requires a longer acquisition time to acquire the equivalent anatomical coverage.…”

Section: Discussionmentioning

confidence: 99%

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Feasibility of free breathing Lung MRI for Radiotherapy using non-Cartesian k-space acquisition schemes

Kumar

Rai

Stemmer

et al. 2017

BJR

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Objective:To test a free-breathing MRI protocol for anatomical and functional assessment during lung cancer radiotherapy by assessing two non-Cartesian acquisition schemes based on T 1 weighted 3D gradient recall echo sequence: (i) stack-of stars (StarVIBE) and (ii) spiral (SpiralVIBE) trajectories. Methods:MR images on five healthy volunteers were acquired on a wide bore 3T scanner (MAGNETOM Skyra, Siemens Healthcare, Erlangen, Germany). Anatomical image quality was assessed on: (1) free breathing (StarVIBE), (2) the standard clinical sequence (volumetric interpolated breath-hold examination, VIBE) acquired in a 20 second (s) compliant breath-hold and (3) 20 s non-compliant breath-hold. For functional assessment, StarVIBE and the current standard breath-hold time-resolved angiography with stochastic trajectories (TWIST) sequence were run as multiphase acquisitions to replicate dynamic contrast enhancement (DCE) in one healthy volunteer. The potential application of the SpiralVIBE sequence for lung parenchymal imaging was assessed on one healthy volunteer. Ten patients with lung cancer were subsequently imaged with the StarVIBE and SpiralVIBE sequences for anatomical and structural assessment. For functional assessment, free-breathing StarVIBE DCE protocol was compared with breath-hold TWIST sequences on four prior lung cancer patients with similar tumour locations. Image quality was evaluated independently and blinded to sequence information by an experienced thoracic radiologist. Results:For anatomical assessment, the compliant breath-hold VIBE sequence was better than free-breathing StarVIBE. However, in the presence of a non-compliant breath-hold, StarVIBE was superior. For functional assessment, StarVIBE outperformed the standard sequence and was shown to provide robust DCE data in the presence of motion. The ultrashort echo of the SpiralVIBE sequence enabled visualisation of lung parenchyma. Conclusion:The two non-Cartesian acquisition sequences, StarVIBE and SpiralVIBE, provide a free-breathing imaging protocol of the lung with sufficient image quality to permit anatomical, structural and functional assessment during radiotherapy. Advances in knowledge:Novel application of non-Cartesian MRI sequences for lung cancer imaging for radiotherapy. Illustration of SpiralVIBE UTE sequence as a promising sequence for lung structural imaging during lung radiotherapy. To test a free-breathing MRI protocol for anatomical and functional assessment during lung cancer radiotherapy by assessing two non-Cartesian acquisition schemes based on T 1 weighted 3D gradient recall echo sequence: (i) stack-of stars (StarVIBE) and (ii) spiral (SpiralVIBE) trajectories. Methods: MR images on five healthy volunteers were acquired on a wide bore 3T scanner (MAGNETOM Skyra, Siemens Healthcare, Erlangen, Germany). Anatomical image quality was assessed on: (1) free breathing (StarVIBE), (2) the standard clinical sequence (volumetric interpolated breath-hold examination, VIBE) acquired in a 20 second (s) compliant breath-hold and ...

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Feasibility of free breathing Lung MRI for Radiotherapy using non-Cartesian k-space acquisition schemes

Kumar

Rai

Stemmer

et al. 2017

BJR

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“…While motion can lead to ghosting artifacts in Cartesian acquisitions, radial acquisitions show lower sensitivity to motion and artifacts appear as more benign streaks. 25 Another origin of streaking is undersampling of k-space, which could be observed for some patients.…”

Section: Discussionmentioning

confidence: 99%

Comprehensive Dynamic Contrast-Enhanced 3D Magnetic Resonance Imaging of the Breast With Fat/Water Separation and High Spatiotemporal Resolution Using Radial Sampling, Compressed Sensing, and Parallel Imaging

et al. 2017

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Objectives To assess the applicability of Dixon RAdial Volumetric Encoding (Dixon-RAVE) for comprehensive dynamic contrast-enhanced 3D MR imaging of the breast using a combination of radial sampling, model-based fat/water separation, compressed sensing, and parallel imaging. Materials and Methods In this Health Insurance Portability and Accountability Act (HIPAA)-compliant prospective study, 24 consecutive patients underwent bilateral breast MRI, including both conventional fat-suppressed and non-fat-suppressed pre-contrast T1-weighted Volumetric Interpolated Breath-hold Examination (VIBE). Afterwards, one continuous Dixon-RAVE scan was performed with the proposed approach while the contrast agent was injected. This scan was immediately followed by the acquisition of four conventional fat-saturated VIBE scans. From the comprehensive Dixon-RAVE dataset, different image contrasts were reconstructed that are comparable to the separate conventional VIBE scans. Two radiologists independently rated image quality (IQ), conspicuity of fibroglandular tissue from fat (FG), and degree of fat suppression (FS) on a 5-point Likert-type scale for the following three comparisons: pre-contrast fat-suppressed (pre-FS), pre-contrast non-fat-suppressed (pre-NFS), and dynamic fat-suppressed (dyn-FS) images. Results When scores were averaged over readers, Dixon-RAVE achieved significantly higher (p < 0.001) degree of fat suppression compared to VIBE, for both pre-FS (4.25 vs. 3.67) and dyn-FS (4.10 vs. 3.46) images. Although Dixon-RAVE had lower IQ score compared to VIBE for the pre-FS (3.56 vs. 3.67, p = 0.490), the pre-NFS (3.54 vs. 3.88, p = 0.009), and the dyn-FS images (3.06 vs. 3.67, p < 0.001), acceptable or better diagnostic quality was achieved (score ≥ 3). The FG score for Dixon-RAVE in comparison to VIBE was significantly higher for the pre-FS image (4.23 vs. 3.85, p = 0.044), lower for the pre-NFS image (3.98 vs. 4.25, p = 0.054), and higher for the dynamic fat-suppressed image (3.90 vs. 3.85, p = 0.845). Conclusions Dixon-RAVE can serve as one-stop-shop approach for comprehensive T1-weighted breast MRI with diagnostic image quality, high spatiotemporal resolution, reduced overall scan time, and improved fat suppression compared to conventional imaging.

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“…Kim et al [24] reported that decreasing the number of radial views leads to an increase in streaking artifacts. Block et al [25] reported that the rVIBE sequence should be used with radial view numbers of 400-800 when using matrix sizes of 224-384 in free-breathing abdominal MR imaging. In our study using the matrix size of 256 × 256, motion artifacts were remarkable on the image with the radial view number of 256 (rVIBE 256 ), and these artifacts improved when using the radial view numbers of 512 (rVIBE 512 ) or 1024 (rVIBE 1024 ).…”

Section: Discussionmentioning

confidence: 99%

Free-Breathing Hepatobiliary Phase Gd-EOB-DTPA-Enhanced MR Imaging with Radial VIBE Sequence: Comparison with Conventional Cartesian VIBE Sequence

Sasaki¹,

Fukukura²,

Kumagae³

et al. 2017

OMICS J Radiol

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Towards Routine Clinical Use of Radial Stack-of-Stars 3D Gradient-Echo Sequences for Reducing Motion Sensitivity

Cited by 151 publications

References 28 publications

Feasibility of free breathing Lung MRI for Radiotherapy using non-Cartesian k-space acquisition schemes

Feasibility of free breathing Lung MRI for Radiotherapy using non-Cartesian k-space acquisition schemes

Comprehensive Dynamic Contrast-Enhanced 3D Magnetic Resonance Imaging of the Breast With Fat/Water Separation and High Spatiotemporal Resolution Using Radial Sampling, Compressed Sensing, and Parallel Imaging

Free-Breathing Hepatobiliary Phase Gd-EOB-DTPA-Enhanced MR Imaging with Radial VIBE Sequence: Comparison with Conventional Cartesian VIBE Sequence

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