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Temporally constrained respiratory gating improves continuously moving table MRI during free breathing.
J Magn Reson Imaging. 2013 Jul; 38(1):198-205.JM

Abstract

PURPOSE

To evaluate a novel breathing motion correction algorithm for continuously moving table magnetic resonance imaging (CMT-MRI) that optimizes motion consistency in a fixed time span.

MATERIALS AND METHODS

In 22 patients CMT-MRI was performed during free breathing. During a preparatory phase (constant) or continuously during the scan (adaptive) gating thresholds were computed from breathing states that should allow for motion consistent k-space sampling. After data from a first k-space traversal was acquired irrespective of breathing motion, subsequently k-space lines with discordant breathing states were reacquired below the gating threshold. Time constraints of CMT-MRI were respected, because a fixed time was allocated for reacquisition. Image quality and lesion depiction were evaluated on images reconstructed from the first traversal and motion-corrected images.

RESULTS

Compared to constant thresholds, gating with adaptive thresholds led to a higher number of reacquired k-space lines (60.1%/41.7%) and a larger fraction of motion consistent final k-space lines (96.6%/78.8%). Adaptive gating induced a significant increase in image quality for all regions affected by breathing motion. Only one of 22 lesions was not depicted on the adaptively corrected images, whereas 15 were readily appreciable.

CONCLUSION

Temporally constrained respiratory gating with adaptive thresholds allows for fully sampled, motion-corrected CMT-MRI acquisitions during free breathing.

Authors+Show Affiliations

Department of Diagnostic Radiology, University Hospital Freiburg, Germany. tobias.baumann@uniklinik-freiburg.deNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

23239532

Citation

Baumann, Tobias, et al. "Temporally Constrained Respiratory Gating Improves Continuously Moving Table MRI During Free Breathing." Journal of Magnetic Resonance Imaging : JMRI, vol. 38, no. 1, 2013, pp. 198-205.
Baumann T, Kannengiesser SA, Honal M. Temporally constrained respiratory gating improves continuously moving table MRI during free breathing. J Magn Reson Imaging. 2013;38(1):198-205.
Baumann, T., Kannengiesser, S. A., & Honal, M. (2013). Temporally constrained respiratory gating improves continuously moving table MRI during free breathing. Journal of Magnetic Resonance Imaging : JMRI, 38(1), 198-205. https://doi.org/10.1002/jmri.23964
Baumann T, Kannengiesser SA, Honal M. Temporally Constrained Respiratory Gating Improves Continuously Moving Table MRI During Free Breathing. J Magn Reson Imaging. 2013;38(1):198-205. PubMed PMID: 23239532.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Temporally constrained respiratory gating improves continuously moving table MRI during free breathing. AU - Baumann,Tobias, AU - Kannengiesser,Stefan A R, AU - Honal,Matthias, Y1 - 2012/12/12/ PY - 2012/07/09/received PY - 2012/10/23/accepted PY - 2012/12/15/entrez PY - 2012/12/15/pubmed PY - 2014/2/4/medline KW - continuously moving table MRI KW - motion correction KW - respiratory gating SP - 198 EP - 205 JF - Journal of magnetic resonance imaging : JMRI JO - J Magn Reson Imaging VL - 38 IS - 1 N2 - PURPOSE: To evaluate a novel breathing motion correction algorithm for continuously moving table magnetic resonance imaging (CMT-MRI) that optimizes motion consistency in a fixed time span. MATERIALS AND METHODS: In 22 patients CMT-MRI was performed during free breathing. During a preparatory phase (constant) or continuously during the scan (adaptive) gating thresholds were computed from breathing states that should allow for motion consistent k-space sampling. After data from a first k-space traversal was acquired irrespective of breathing motion, subsequently k-space lines with discordant breathing states were reacquired below the gating threshold. Time constraints of CMT-MRI were respected, because a fixed time was allocated for reacquisition. Image quality and lesion depiction were evaluated on images reconstructed from the first traversal and motion-corrected images. RESULTS: Compared to constant thresholds, gating with adaptive thresholds led to a higher number of reacquired k-space lines (60.1%/41.7%) and a larger fraction of motion consistent final k-space lines (96.6%/78.8%). Adaptive gating induced a significant increase in image quality for all regions affected by breathing motion. Only one of 22 lesions was not depicted on the adaptively corrected images, whereas 15 were readily appreciable. CONCLUSION: Temporally constrained respiratory gating with adaptive thresholds allows for fully sampled, motion-corrected CMT-MRI acquisitions during free breathing. SN - 1522-2586 UR - https://www.unboundmedicine.com/medline/citation/23239532/Temporally_constrained_respiratory_gating_improves_continuously_moving_table_MRI_during_free_breathing_ L2 - https://doi.org/10.1002/jmri.23964 DB - PRIME DP - Unbound Medicine ER -