bSSFP phase correction and its use in magnetic resonance electrical properties tomography

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buir.contributor.authorÖzdemir, Safa
buir.contributor.authorİder, Yusuf Ziya
dc.citation.epage946en_US
dc.citation.issueNumber2en_US
dc.citation.spage934en_US
dc.citation.volumeNumber81en_US
dc.contributor.authorÖzdemir, Safaen_US
dc.contributor.authorİder, Yusuf Ziyaen_US
dc.date.accessioned2020-02-11T11:24:09Z
dc.date.available2020-02-11T11:24:09Z
dc.date.issued2019
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.description.abstractPurpose Balanced steady‐state free precession (bSSFP) sequence is widely used because of its high SNR and high speed. However, bSSFP images suffer from “banding artifact” caused by B0 inhomogeneity. In this article, we propose a method to remove this artifact in bSSFP phase images and investigate the usage of the corrected phase images in phase‐based magnetic resonance electrical properties tomography (MREPT). Theory and Methods Two bSSFP phase images, obtained with different excitation frequencies, are collaged to get rid of the regions containing banding artifacts. Phase of the collaged bSSFP image is the sum of the transceive phase of the RF system and an error term that depends on B0 and T2. By using B0 and T2 maps, this error is eliminated from bSSFP phase images by using pixel‐wise corrections. Conductivity maps are obtained from the uncorrected and the corrected phase images using the phase‐based cr‐MREPT method. Results Phantom and human experiment results of the proposed method are illustrated for both phase images and conductivity maps. It is shown that uncorrected phase images yield unacceptable conductivity images. When only B0 information is used for phase correction conductivity, reconstructions are substantially improved, and yet T2 information is still needed to fully recover accurate and undistorted conductivity images. Conclusions With the proposed technique, B0 sensitivity of the bSSFP phase images can be removed by using B0 and T2 maps. It is also shown that corrected bSSFP phase images are of sufficient quality to be used in conductivity imaging.en_US
dc.description.provenanceSubmitted by Onur Emek (onur.emek@bilkent.edu.tr) on 2020-02-11T11:24:09Z No. of bitstreams: 1 bSSFP_phase_correction_and_its_use_in_magnetic_resonance_electrical_properties_tomography.pdf: 1396584 bytes, checksum: bb86d0a7f39f394af60bcf2ef0eb632f (MD5)en
dc.description.provenanceMade available in DSpace on 2020-02-11T11:24:09Z (GMT). No. of bitstreams: 1 bSSFP_phase_correction_and_its_use_in_magnetic_resonance_electrical_properties_tomography.pdf: 1396584 bytes, checksum: bb86d0a7f39f394af60bcf2ef0eb632f (MD5) Previous issue date: 2019en
dc.description.sponsorshipTUBITAK. Grant Number: 114E522,UMRAM, Bilkent University, Ankaraen_US
dc.embargo.release2020-02-01
dc.identifier.doi10.1002/mrm.27446en_US
dc.identifier.issn0740-3194
dc.identifier.urihttp://hdl.handle.net/11693/53271
dc.language.isoEnglishen_US
dc.publisherInternational Society for Magnetic Resonance in Medicineen_US
dc.relation.isversionofhttps://doi.org/10.1002/mrm.27446en_US
dc.source.titleMagnetic Resonance in Medicineen_US
dc.subjectBanding artifacten_US
dc.subjectbSSFPen_US
dc.subjectConductivityen_US
dc.subjectMREPTen_US
dc.subjectPhase‐baseden_US
dc.titlebSSFP phase correction and its use in magnetic resonance electrical properties tomographyen_US
dc.typeArticleen_US

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