The influence of initial outlines on manual segmentation.
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| Title: | The influence of initial outlines on manual segmentation. |
|---|---|
| Authors: | Sensakovic, William F.1 wfsensak@uchicago.edu, Starkey, Adam1, Roberts, Rachael1, Straus, Christopher1, Caligiuri, Philip2, Kocherginsky, Masha3, Armato, Samuel G.1 |
| Source: | Medical Physics. May2010, Vol. 37 Issue 5, p2153-2158. 6p. 2 Black and White Photographs, 4 Charts. |
| Subjects: | Tomography, Tumor growth, Medical imaging systems, Diagnostic imaging, Medical radiography |
| Abstract: | Purpose: Initial outlines are often presented as an aid to reduce the time-cost associated with manual segmentation and measurement of structures in medical images. This study evaluated the influence of initial outlines on manual segmentation intraobserver and interobserver precision. Methods: Three observers independently outlined all pleural mesothelioma tumors present in five computed tomography (CT) sections in each of 30 patient scans. After a lapse of time, each observer was presented with the same series of CT sections with the outlines of each observer superimposed as initial outlines. Each observer created altered outlines by altering the initial outlines to reflect their perception of the tumor boundary. Altered outlines were compared to original outlines using the Jaccard similarity coefficient (J). Intraobserver and interobserver precision of observer outlines were calculated by applying linear mixed effects analysis of variance models to the J values. The percent of minor alterations (alterations that resulted in only slight changes in the initial outline) was also recorded. Results: The average J value between pairs of observer original outlines was 0.371. The average J value between pairs of observer outlines when altered from an identical initial outline was 0.796, indicating increased interobserver precision. The average difference between J values of an observer’s segmentation created by altering their own initial outline and when altering a different observer’s initial outline was 0.476, indicating initial outlines strongly influence intraobserver precision. Observers made minor alterations on 74.5% of initial outlines with which they were presented. Conclusions: Intraobserver and interobserver precision were strongly dependent on the initial outline. These effects are likely due to the tendency of observers to make only minor corrections to initial outlines. This finding could impact observer study design, tumor growth assessment, computer-aided diagnosis system validation, and radiation therapy target volume definition when initial outlines are used as an observer aid. [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 |
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| Header | DbId: egs DbLabel: Engineering Source An: 50173514 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: The influence of initial outlines on manual segmentation. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Sensakovic%2C+William+F%2E%22">Sensakovic, William F.</searchLink><relatesTo>1</relatesTo><i> wfsensak@uchicago.edu</i><br /><searchLink fieldCode="AR" term="%22Starkey%2C+Adam%22">Starkey, Adam</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Roberts%2C+Rachael%22">Roberts, Rachael</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Straus%2C+Christopher%22">Straus, Christopher</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Caligiuri%2C+Philip%22">Caligiuri, Philip</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Kocherginsky%2C+Masha%22">Kocherginsky, Masha</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Armato%2C+Samuel+G%2E%22">Armato, Samuel G.</searchLink><relatesTo>1</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Medical+Physics%22">Medical Physics</searchLink>. May2010, Vol. 37 Issue 5, p2153-2158. 6p. 2 Black and White Photographs, 4 Charts. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Tomography%22">Tomography</searchLink><br /><searchLink fieldCode="DE" term="%22Tumor+growth%22">Tumor growth</searchLink><br /><searchLink fieldCode="DE" term="%22Medical+imaging+systems%22">Medical imaging systems</searchLink><br /><searchLink fieldCode="DE" term="%22Diagnostic+imaging%22">Diagnostic imaging</searchLink><br /><searchLink fieldCode="DE" term="%22Medical+radiography%22">Medical radiography</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Purpose: Initial outlines are often presented as an aid to reduce the time-cost associated with manual segmentation and measurement of structures in medical images. This study evaluated the influence of initial outlines on manual segmentation intraobserver and interobserver precision. Methods: Three observers independently outlined all pleural mesothelioma tumors present in five computed tomography (CT) sections in each of 30 patient scans. After a lapse of time, each observer was presented with the same series of CT sections with the outlines of each observer superimposed as initial outlines. Each observer created altered outlines by altering the initial outlines to reflect their perception of the tumor boundary. Altered outlines were compared to original outlines using the Jaccard similarity coefficient (J). Intraobserver and interobserver precision of observer outlines were calculated by applying linear mixed effects analysis of variance models to the J values. The percent of minor alterations (alterations that resulted in only slight changes in the initial outline) was also recorded. Results: The average J value between pairs of observer original outlines was 0.371. The average J value between pairs of observer outlines when altered from an identical initial outline was 0.796, indicating increased interobserver precision. The average difference between J values of an observer’s segmentation created by altering their own initial outline and when altering a different observer’s initial outline was 0.476, indicating initial outlines strongly influence intraobserver precision. Observers made minor alterations on 74.5% of initial outlines with which they were presented. Conclusions: Intraobserver and interobserver precision were strongly dependent on the initial outline. These effects are likely due to the tendency of observers to make only minor corrections to initial outlines. This finding could impact observer study design, tumor growth assessment, computer-aided diagnosis system validation, and radiation therapy target volume definition when initial outlines are used as an observer aid. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>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.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1118/1.3392287 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 6 StartPage: 2153 Subjects: – SubjectFull: Tomography Type: general – SubjectFull: Tumor growth Type: general – SubjectFull: Medical imaging systems Type: general – SubjectFull: Diagnostic imaging Type: general – SubjectFull: Medical radiography Type: general Titles: – TitleFull: The influence of initial outlines on manual segmentation. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Sensakovic, William F. – PersonEntity: Name: NameFull: Starkey, Adam – PersonEntity: Name: NameFull: Roberts, Rachael – PersonEntity: Name: NameFull: Straus, Christopher – PersonEntity: Name: NameFull: Caligiuri, Philip – PersonEntity: Name: NameFull: Kocherginsky, Masha – PersonEntity: Name: NameFull: Armato, Samuel G. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 05 Text: May2010 Type: published Y: 2010 Identifiers: – Type: issn-print Value: 00942405 Numbering: – Type: volume Value: 37 – Type: issue Value: 5 Titles: – TitleFull: Medical Physics Type: main |
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