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Magnetic Resonance Materials in Physics, Biology and Medicine

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25.07.2017 | Research Article

Utilization of MR angiography in perfusion imaging for identifying arterial input function

verfasst von: Bora Buyuksarac, Mehmed Ozkan

Erschienen in: Magnetic Resonance Materials in Physics, Biology and Medicine | Ausgabe 6/2017

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Abstract

Objective

This research utilizes magnetic resonance angiography (MRA) to identify arterial locations during the parametric evaluation of concentration time curves (CTCs), and to prevent shape distortions in arterial input function (AIF).

Materials and methods

We carried out cluster analysis with the CTC parameters of voxels located within and around the middle cerebral artery (MCA). Through MRA, we located voxels that meet the AIF criteria and those with distorted CTCs. To minimize partial volume effect, we re-scaled the time integral of CTCs by the time integral of venous output function (VOF). We calculated the steady-state value to area under curve ratio (SS:AUC) of VOF and used it as a reference in selecting AIF. CTCs close to this reference value (selected AIF) and those far from it were used (eliminated AIF) to compute cerebral blood flow (CBF).

Results

Eliminated AIFs were found to be either on or anterior to MCA, whereas selected AIFs were located superior, inferior, posterior, or anterior to MCA. If the SS:AUC of AIF was far from the reference value, CBF was either under- or over-estimated by a maximum of 41.1 ± 14.3 and 36.6 ± 19.2%, respectively.

Conclusion

MRA enables excluding voxels on the MCA during cluster analysis, and avoiding the risk of shape distortions.

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Titel: Utilization of MR angiography in perfusion imaging for identifying arterial input function
verfasst von: Bora Buyuksarac
Mehmed Ozkan
Publikationsdatum: 25.07.2017
Verlag: Springer Berlin Heidelberg
Erschienen in: Magnetic Resonance Materials in Physics, Biology and Medicine / Ausgabe 6/2017
Print ISSN: 0968-5243
Elektronische ISSN: 1352-8661
DOI: https://doi.org/10.1007/s10334-017-0643-y

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Utilization of MR angiography in perfusion imaging for identifying arterial input function

Abstract

Objective

Materials and methods

Results

Conclusion

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Live-Webinar: Aktuelle Leitlinien bei Herz-Kreislauf-Erkrankungen

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Abstract

Objective

Materials and methods

Results

Conclusion

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