Comparison of power spectra for tomosynthesis projections and reconstructed images.
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| Title: | Comparison of power spectra for tomosynthesis projections and reconstructed images. |
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| Authors: | Engstrom, Emma1 engstrom.emma@gmail.com, Reiser, Ingrid2 ireiser@uchicago.edu, Nishikawa, Robert2 r-nishikawa@uchicago.edu |
| Source: | Medical Physics. May2009, Vol. 36 Issue 5, p1753-1758. 6p. 1 Diagram, 5 Graphs. |
| Subjects: | Mammograms, Breast exams, Medical imaging systems, Medical equipment, Patients, Medical care |
| Abstract: | Burgess et al. [Med. Phys. 28, 419–437 (2001)] showed that the power spectrum of mammographic breast background follows a power law and that lesion detectability is affected by the power-law exponent β which measures the amount of structure in the background. Following the study of Burgess et al., the authors measured and compared the power-law exponent of mammographic backgrounds in tomosynthesis projections and reconstructed slices to investigate the effect of tomosynthesis imaging on background structure. Our data set consisted of 55 patient cases. For each case, regions of interest (ROIs) were extracted from both projection images and reconstructed slices. The periodogram of each ROI was computed by taking the squared modulus of the Fourier transform of the ROI. The power-law exponent was determined for each periodogram and averaged across all ROIs extracted from all projections or reconstructed slices for each patient data set. For the projections, the mean β averaged across the 55 cases was 3.06 (standard deviation of 0.21), while it was 2.87 (0.24) for the corresponding reconstructions. The difference in β for a given patient between the projection ROIs and the reconstructed ROIs averaged across the 55 cases was 0.194, which was statistically significant (p<0.001). The 95% CI for the difference between the mean value of β for the projections and reconstructions was [0.170, 0.218]. The results are consistent with the observation that the amount of breast structure in the tomosynthesis slice is reduced compared to projection mammography and that this may lead to improved lesion detectability. [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: 38316339 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Comparison of power spectra for tomosynthesis projections and reconstructed images. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Engstrom%2C+Emma%22">Engstrom, Emma</searchLink><relatesTo>1</relatesTo><i> engstrom.emma@gmail.com</i><br /><searchLink fieldCode="AR" term="%22Reiser%2C+Ingrid%22">Reiser, Ingrid</searchLink><relatesTo>2</relatesTo><i> ireiser@uchicago.edu</i><br /><searchLink fieldCode="AR" term="%22Nishikawa%2C+Robert%22">Nishikawa, Robert</searchLink><relatesTo>2</relatesTo><i> r-nishikawa@uchicago.edu</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Medical+Physics%22">Medical Physics</searchLink>. May2009, Vol. 36 Issue 5, p1753-1758. 6p. 1 Diagram, 5 Graphs. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Mammograms%22">Mammograms</searchLink><br /><searchLink fieldCode="DE" term="%22Breast+exams%22">Breast exams</searchLink><br /><searchLink fieldCode="DE" term="%22Medical+imaging+systems%22">Medical imaging systems</searchLink><br /><searchLink fieldCode="DE" term="%22Medical+equipment%22">Medical equipment</searchLink><br /><searchLink fieldCode="DE" term="%22Patients%22">Patients</searchLink><br /><searchLink fieldCode="DE" term="%22Medical+care%22">Medical care</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Burgess et al. [Med. Phys. 28, 419–437 (2001)] showed that the power spectrum of mammographic breast background follows a power law and that lesion detectability is affected by the power-law exponent β which measures the amount of structure in the background. Following the study of Burgess et al., the authors measured and compared the power-law exponent of mammographic backgrounds in tomosynthesis projections and reconstructed slices to investigate the effect of tomosynthesis imaging on background structure. Our data set consisted of 55 patient cases. For each case, regions of interest (ROIs) were extracted from both projection images and reconstructed slices. The periodogram of each ROI was computed by taking the squared modulus of the Fourier transform of the ROI. The power-law exponent was determined for each periodogram and averaged across all ROIs extracted from all projections or reconstructed slices for each patient data set. For the projections, the mean β averaged across the 55 cases was 3.06 (standard deviation of 0.21), while it was 2.87 (0.24) for the corresponding reconstructions. The difference in β for a given patient between the projection ROIs and the reconstructed ROIs averaged across the 55 cases was 0.194, which was statistically significant (p<0.001). The 95% CI for the difference between the mean value of β for the projections and reconstructions was [0.170, 0.218]. The results are consistent with the observation that the amount of breast structure in the tomosynthesis slice is reduced compared to projection mammography and that this may lead to improved lesion detectability. [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: 10.1118/1.3116774 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 6 StartPage: 1753 Subjects: – SubjectFull: Mammograms Type: general – SubjectFull: Breast exams Type: general – SubjectFull: Medical imaging systems Type: general – SubjectFull: Medical equipment Type: general – SubjectFull: Patients Type: general – SubjectFull: Medical care Type: general Titles: – TitleFull: Comparison of power spectra for tomosynthesis projections and reconstructed images. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Engstrom, Emma – PersonEntity: Name: NameFull: Reiser, Ingrid – PersonEntity: Name: NameFull: Nishikawa, Robert IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 05 Text: May2009 Type: published Y: 2009 Identifiers: – Type: issn-print Value: 00942405 Numbering: – Type: volume Value: 36 – Type: issue Value: 5 Titles: – TitleFull: Medical Physics Type: main |
| ResultId | 1 |
