Loss of labelling efficiency caused by carotid stent in pseudocontinuous arterial spin labelling perfusion study

Chen, D.Y.-T.; Kuo, Ying Sheng; Hsu, Hui-Ling; Yan, Feng; Liu, H.-L.; Chen, C.-J.; Tseng, Yi‐Ping

doi:10.1016/j.crad.2015.10.004

Cited by 7 publications

(5 citation statements)

References 22 publications

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“…This mainly can be explained by the compromised labeling efficiency in pCASL imaging caused by the presence of carotid stent in many of the subjects. In future studies, an additional scan to identify the extent of field inhomogeneity induced by the stent can be performed, and the labeling plane can thus be placed away from the inhomogeneous region [10]. Besides, the labeling efficiency might be also improved by performing f0 correction and shimming at the labeling plane, which was not done in this study.…”

Section: Discussionmentioning

confidence: 99%

“…Nevertheless, studies have shown that the accuracy of pCASL may be compromised by several factors, such as field inhomogeneity and large blood velocity variations [7][8][9]. This issue may become particularly significant in the presence of carotid stents that can induce large local field inhomogeneity [10], or severe stenosis and artery tortuosity that may greatly disturb luminal blood flow.…”

Section: Introductionmentioning

confidence: 99%

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Intracranial vascular feature changes in time of flight MR angiography in patients undergoing carotid revascularization surgery

Chen

Shirakawa

et al. 2021

Magnetic Resonance Imaging

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Purpose: To characterize the intracranial vascular features extracted from time of flight (TOF) images and their changes from baseline to follow-up in patients undergoing carotid revascularization, using arterial spin labeling (ASL) cerebral blood flow (CBF) measurement as a reference. Methods:In this retrospective study, brain TOF and ASL images of 99 subjects, acquired before, within 48 h, and/or 6 months after, carotid revascularization surgery were analyzed. TOF images were analyzed using a custom software (iCafe) to quantify intracranial vascular features, including total vessel length, total vessel volume, and number of branches. Mean whole-brain CBF was calculated from ASL images. ASL scans showing low ASL signal in the entire flow territory of an internal carotid artery (ICA), which may be caused by labeling failure, were excluded. Changes and correlations between time points were analyzed separately for TOF intracranial vascular features and ASL CBF.Results: Similar to ASL CBF, TOF vascular features (i.e. total vessel length, total vessel volume and number of branches) increased dramatically from baseline to post-surgery, then returned to a level slightly higher than the baseline in long-term follow-up (All P < 0.05). Correlation between time points was observed for all three TOF vascular features but not for ASL CBF. Conclusion:Intracranial vascular features, including total vessel length, total vessel volume and number of branches, extracted from TOF images are useful in detecting brain blood flow changes induced by carotid revascularization surgery.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Intracranial vascular feature changes in time of flight MR angiography in patients undergoing carotid revascularization surgery

Chen

Shirakawa

et al. 2021

Magnetic Resonance Imaging

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“…repeated with perfusion imaging performed above the carotid stent [1], which then demonstrated symmetric blood flow in both hemispheres (Fig. 2).…”

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confidence: 88%

Perfusion confusion after carotid artery stenting: Answer

Shah

Jadhav

2020

Journal of Clinical Neuroscience

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“…• Labeling: In ASL, the problem can lie outside the field of view, for example, labeling may be degraded in patients with dental implants and/or carotid stents and can lead to misinterpretation. 136 On single-delay ASL scans, a unilateral fetal variant of the posterior cerebral artery (PCA) can create the image of apparent (or pseudo-) hypoperfusion in the contralateral PCA territory. Similarly, when both PCAs have a regular (non-hypoplastic) P1 segment and there is not a significant contribution of the posterior communicating artery blood flow, both posterior cerebral artery territories can demonstrate pseudo-hypoperfusion relative to the anterior circulation territories.…”

Section: Standard Interpretation and Reportingmentioning

confidence: 99%

“…Does the asymmetry follow a vascular territory, which could reflect a true perfusion abnormality or related to asymmetric labeling efficiency (very common between the cervical internal carotid and vertebral arteries) ? When performing PCASL it can be valuable to plan the ASL on sagittal and coronal angiography surveys (e.g., if the patient has already had an MRA) such that the labeling plane is roughly perpendicular to both the internal carotid and vertebral arteries. Labeling: In ASL, the problem can lie outside the field of view, for example, labeling may be degraded in patients with dental implants and/or carotid stents and can lead to misinterpretation 136 . On single‐delay ASL scans, a unilateral fetal variant of the posterior cerebral artery (PCA) can create the image of apparent (or pseudo‐) hypoperfusion in the contralateral PCA territory.…”

Section: Standard Interpretation and Reportingmentioning

confidence: 99%

Current state and guidance on arterial spin labeling perfusion MRI in clinical neuroimaging

Lindner

Bolar

Achten

et al. 2023

Magnetic Resonance in Med

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This article focuses on clinical applications of arterial spin labeling (ASL) and is part of a wider effort from the International Society for Magnetic Resonance in Medicine (ISMRM) Perfusion Study Group to update and expand on the recommendations provided in the 2015 ASL consensus paper. Although the 2015 consensus paper provided general guidelines for clinical applications of ASL MRI, there was a lack of guidance on disease-specific parameters. Since that time, the clinical availability and clinical demand for ASL MRI has increased. This position paper provides guidance on using ASL in specific clinical scenarios, including acute ischemic stroke and steno-occlusive disease, arteriovenous malformations and fistulas, brain tumors, neurodegenerative disease, seizures/epilepsy, and pediatric neuroradiology applications, focusing on disease-specific considerations for sequence optimization and interpretation. We present several neuroradiological applications in which ASL provides unique information essential for making the diagnosis. This guidance is intended for anyone interested in using ASL in a routine clinical setting (i.e., on a single-subject basis rather than in cohort studies) building on the previous ASL consensus review.

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Loss of labelling efficiency caused by carotid stent in pseudocontinuous arterial spin labelling perfusion study

Cited by 7 publications

References 22 publications

Intracranial vascular feature changes in time of flight MR angiography in patients undergoing carotid revascularization surgery

Intracranial vascular feature changes in time of flight MR angiography in patients undergoing carotid revascularization surgery

Perfusion confusion after carotid artery stenting: Answer

Current state and guidance on arterial spin labeling perfusion MRI in clinical neuroimaging

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