View in EDS PDF Full Text

Evaluation of patient‐specific MR distortion correction schemes for improved target localization accuracy in SRS.

Saved in:
Bibliographic Details
Title: Evaluation of patient‐specific MR distortion correction schemes for improved target localization accuracy in SRS.
Authors: Dellios, Dimitrios1 (AUTHOR), Pappas, Eleftherios P.1 (AUTHOR), Seimenis, Ioannis1 (AUTHOR), Paraskevopoulou, Chryssa2 (AUTHOR), Lampropoulos, Kostas I.2 (AUTHOR), Lymperopoulou, Georgia3 (AUTHOR), Karaiskos, Pantelis1,2 (AUTHOR) pkaraisk@med.uoa.gr
Source: Medical Physics. Apr2021, Vol. 48 Issue 4, p1661-1672. 12p.
Subjects: Dosimeters, Magnetic resonance imaging, Stereotactic radiosurgery, Brain metastasis, Magnetic resonance, Medical protocols
Abstract: Purpose: This work aims at promoting target localization accuracy in cranial stereotactic radiosurgery (SRS) applications by focusing on the correction of sequence‐dependent (also patient induced) magnetic resonance (MR) distortions at the lesion locations. A phantom‐based quality assurance (QA) methodology was developed and implemented for the evaluation of three distortion correction techniques. The same approach was also adapted to cranial MR images used for SRS treatment planning purposes in single or multiple brain metastases cases. Methods: A three‐dimensional (3D)‐printed head phantom was filled with a 3D polymer gel dosimeter. Following treatment planning and dose delivery, volumes of radiation‐induced polymerization served as hypothetical lesions, offering adequate MR contrast with respect to the surrounding unirradiated areas. T1‐weighted (T1w) MR imaging was performed at 1.5 T using the clinical scanning protocol for SRS. Additional images were acquired to implement three distortion correction methods; the field mapping (FM), mean image (MI) and signal integration (SI) techniques. Reference lesion locations were calculated as the averaged centroid positions of each target identified in the forward and reverse read gradient polarity MRI scans. The same techniques and workflows were implemented for the correction of contrast‐enhanced T1w MR images of 10 patients with a total of 27 brain metastases. Results: All methods employed in the phantom study diminished spatial distortion. Median and maximum distortion magnitude decreased from 0.7 mm (2.10 ppm) and 0.8 mm (2.36 ppm), respectively, to <0.2 mm (0.61 ppm) at all target locations, using any of the three techniques. Image quality of the corrected images was acceptable, while contrast‐to‐noise ratio slightly increased. Results of the patient study were in accordance with the findings of the phantom study. Residual distortion in corrected patient images was found to be <0.3 mm in the vast majority of targets. Overall, the MI approach appears to be the most efficient correction method from the three investigated. Conclusions: In cranial SRS applications, patient‐specific distortion correction at the target location(s) is feasible and effective, despite the expense of longer imaging time since additional MRI scan(s) need to be performed. A phantom‐based QA methodology was developed and presented to reassure efficient implementation of correction techniques for sequence‐dependent spatial distortion. [ABSTRACT FROM AUTHOR]
Copyright of Medical Physics is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
FullText Links:
  – Type: pdflink
Text:
  Availability: 0
Header DbId: egs
DbLabel: Engineering Source
An: 149900944
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
IllustrationInfo
Items – Name: Title
  Label: Title
  Group: Ti
  Data: Evaluation of patient‐specific MR distortion correction schemes for improved target localization accuracy in SRS.
– Name: Author
  Label: Authors
  Group: Au
  Data: &lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Dellios%2C+Dimitrios%22&quot;&gt;Dellios, Dimitrios&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Pappas%2C+Eleftherios+P%2E%22&quot;&gt;Pappas, Eleftherios P.&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Seimenis%2C+Ioannis%22&quot;&gt;Seimenis, Ioannis&lt;/searchLink&gt;&lt;relatesTo&gt;1&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Paraskevopoulou%2C+Chryssa%22&quot;&gt;Paraskevopoulou, Chryssa&lt;/searchLink&gt;&lt;relatesTo&gt;2&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Lampropoulos%2C+Kostas+I%2E%22&quot;&gt;Lampropoulos, Kostas I.&lt;/searchLink&gt;&lt;relatesTo&gt;2&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Lymperopoulou%2C+Georgia%22&quot;&gt;Lymperopoulou, Georgia&lt;/searchLink&gt;&lt;relatesTo&gt;3&lt;/relatesTo&gt; (AUTHOR)&lt;br /&gt;&lt;searchLink fieldCode=&quot;AR&quot; term=&quot;%22Karaiskos%2C+Pantelis%22&quot;&gt;Karaiskos, Pantelis&lt;/searchLink&gt;&lt;relatesTo&gt;1,2&lt;/relatesTo&gt; (AUTHOR)&lt;i&gt; pkaraisk@med.uoa.gr&lt;/i&gt;
– Name: TitleSource
  Label: Source
  Group: Src
  Data: &lt;searchLink fieldCode=&quot;JN&quot; term=&quot;%22Medical+Physics%22&quot;&gt;Medical Physics&lt;/searchLink&gt;. Apr2021, Vol. 48 Issue 4, p1661-1672. 12p.
– Name: Subject
  Label: Subjects
  Group: Su
  Data: &lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Dosimeters%22&quot;&gt;Dosimeters&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Magnetic+resonance+imaging%22&quot;&gt;Magnetic resonance imaging&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Stereotactic+radiosurgery%22&quot;&gt;Stereotactic radiosurgery&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Brain+metastasis%22&quot;&gt;Brain metastasis&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Magnetic+resonance%22&quot;&gt;Magnetic resonance&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Medical+protocols%22&quot;&gt;Medical protocols&lt;/searchLink&gt;
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Purpose: This work aims at promoting target localization accuracy in cranial stereotactic radiosurgery (SRS) applications by focusing on the correction of sequence‐dependent (also patient induced) magnetic resonance (MR) distortions at the lesion locations. A phantom‐based quality assurance (QA) methodology was developed and implemented for the evaluation of three distortion correction techniques. The same approach was also adapted to cranial MR images used for SRS treatment planning purposes in single or multiple brain metastases cases. Methods: A three‐dimensional (3D)‐printed head phantom was filled with a 3D polymer gel dosimeter. Following treatment planning and dose delivery, volumes of radiation‐induced polymerization served as hypothetical lesions, offering adequate MR contrast with respect to the surrounding unirradiated areas. T1‐weighted (T1w) MR imaging was performed at 1.5 T using the clinical scanning protocol for SRS. Additional images were acquired to implement three distortion correction methods; the field mapping (FM), mean image (MI) and signal integration (SI) techniques. Reference lesion locations were calculated as the averaged centroid positions of each target identified in the forward and reverse read gradient polarity MRI scans. The same techniques and workflows were implemented for the correction of contrast‐enhanced T1w MR images of 10 patients with a total of 27 brain metastases. Results: All methods employed in the phantom study diminished spatial distortion. Median and maximum distortion magnitude decreased from 0.7 mm (2.10 ppm) and 0.8 mm (2.36 ppm), respectively, to &lt;0.2 mm (0.61 ppm) at all target locations, using any of the three techniques. Image quality of the corrected images was acceptable, while contrast‐to‐noise ratio slightly increased. Results of the patient study were in accordance with the findings of the phantom study. Residual distortion in corrected patient images was found to be &lt;0.3 mm in the vast majority of targets. Overall, the MI approach appears to be the most efficient correction method from the three investigated. Conclusions: In cranial SRS applications, patient‐specific distortion correction at the target location(s) is feasible and effective, despite the expense of longer imaging time since additional MRI scan(s) need to be performed. A phantom‐based QA methodology was developed and presented to reassure efficient implementation of correction techniques for sequence‐dependent spatial distortion. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: &lt;i&gt;Copyright of Medical Physics is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder&#39;s express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.&lt;/i&gt; (Copyright applies to all Abstracts.)
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=egs&AN=149900944
RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1002/mp.14615
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 12
        StartPage: 1661
    Subjects:
      – SubjectFull: Dosimeters
        Type: general
      – SubjectFull: Magnetic resonance imaging
        Type: general
      – SubjectFull: Stereotactic radiosurgery
        Type: general
      – SubjectFull: Brain metastasis
        Type: general
      – SubjectFull: Magnetic resonance
        Type: general
      – SubjectFull: Medical protocols
        Type: general
    Titles:
      – TitleFull: Evaluation of patient‐specific MR distortion correction schemes for improved target localization accuracy in SRS.
        Type: main
  BibRelationships:
    HasContributorRelationships:
      – PersonEntity:
          Name:
            NameFull: Dellios, Dimitrios
      – PersonEntity:
          Name:
            NameFull: Pappas, Eleftherios P.
      – PersonEntity:
          Name:
            NameFull: Seimenis, Ioannis
      – PersonEntity:
          Name:
            NameFull: Paraskevopoulou, Chryssa
      – PersonEntity:
          Name:
            NameFull: Lampropoulos, Kostas I.
      – PersonEntity:
          Name:
            NameFull: Lymperopoulou, Georgia
      – PersonEntity:
          Name:
            NameFull: Karaiskos, Pantelis
    IsPartOfRelationships:
      – BibEntity:
          Dates:
            – D: 01
              M: 04
              Text: Apr2021
              Type: published
              Y: 2021
          Identifiers:
            – Type: issn-print
              Value: 00942405
          Numbering:
            – Type: volume
              Value: 48
            – Type: issue
              Value: 4
          Titles:
            – TitleFull: Medical Physics
              Type: main
ResultId 1