1
40
2
-
Text
A resource consisting primarily of words for reading. Examples include books, letters, dissertations, poems, newspapers, articles, archives of mailing lists. Note that facsimiles or images of texts are still of the genre Text.
URL Address
<a href="http://doi.org/10.7863/jum.2012.31.6.895" target="_blank" rel="noreferrer noopener">http://doi.org/10.7863/jum.2012.31.6.895</a>
Pages
895–902
Issue
6
Volume
31
Dublin Core
The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
A name given to the resource
Effects of precompression on elasticity imaging of the breast: development of a clinically useful semiquantitative method of precompression assessment.
Publisher
An entity responsible for making the resource available
Journal of ultrasound in medicine : official journal of the American Institute of Ultrasound in Medicine
Date
A point or period of time associated with an event in the lifecycle of the resource
2012
2012-06
Subject
The topic of the resource
Adult; Female; Humans; Middle Aged; Young Adult; Ultrasonography; Sensitivity and Specificity; Breast Neoplasms/*diagnostic imaging; Reproducibility of Results; Elasticity Imaging Techniques/*methods; *Algorithms; Artifacts; Image Enhancement/methods; Palpation/*methods; Image Interpretation; Mammary/*methods; Computer-Assisted/*methods
Creator
An entity primarily responsible for making the resource
Barr Richard G; Zhang Zheng
Description
An account of the resource
OBJECTIVES: Elastography of the breast is a new technique for characterization of breast lesions. The reproducibility of elastographic techniques has been questioned. Precompression is known to effect elastographic results. This study determined the effect of precompression on clinical images and proposes a method to semiquantify the amount of precompression applied. METHODS: Ten patients with different breast tissue types were evaluated with shear wave and strain elastography with varying amounts of precompression. The changes in the shear wave speed and images were documented. A semiquantitative method for determining the amount of precompression applied is presented. The reproducibility of the technique was determine by repeated measurements by 3 sonographers. RESULTS: Precompression substantially changes the elastographic results of patient images on both strain and shear wave elastography. Fat can have the same elasticity as cancer with clinically possible amounts of precompression. The proposed method for determining the amount of precompression applied has variability of less than 10%, which is within the error of the technique and would not affect clinical results. Four zones of precompression are identified, which are useful for explaining the effects of precompression on both strain and shear wave imaging. CONCLUSIONS: Precompression is a substantial factor in obtaining accurate results with elastography. A proposed simple, easily applied technique can be used to semiquantify the amount of precompression applied. Precompression should be minimized in obtaining breast clinical images.
Identifier
An unambiguous reference to the resource within a given context
<a href="http://doi.org/10.7863/jum.2012.31.6.895" target="_blank" rel="noreferrer noopener">10.7863/jum.2012.31.6.895</a>
Rights
Information about rights held in and over the resource
Article information provided for research and reference use only. All rights are retained by the journal listed under publisher and/or the creator(s).
*Algorithms
2012
Adult
Artifacts
Barr Richard G
Breast Neoplasms/*diagnostic imaging
Computer-Assisted/*methods
Elasticity Imaging Techniques/*methods
Female
Humans
Image Enhancement/methods
Image Interpretation
Journal of ultrasound in medicine : official journal of the American Institute of Ultrasound in Medicine
Mammary/*methods
Middle Aged
Palpation/*methods
Reproducibility of Results
Sensitivity and Specificity
Ultrasonography
Young Adult
Zhang Zheng
-
Text
A resource consisting primarily of words for reading. Examples include books, letters, dissertations, poems, newspapers, articles, archives of mailing lists. Note that facsimiles or images of texts are still of the genre Text.
URL Address
<a href="http://doi.org/10.1148/radiol.14132404" target="_blank" rel="noreferrer noopener">http://doi.org/10.1148/radiol.14132404</a>
Pages
45–53
Issue
1
Volume
275
Dublin Core
The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
A name given to the resource
Shear-wave elastography of the breast: value of a quality measure and comparison with strain elastography.
Publisher
An entity responsible for making the resource available
Radiology
Date
A point or period of time associated with an event in the lifecycle of the resource
2015
2015-04
Subject
The topic of the resource
80 and over; 80 and Over; Adolescence; Adolescent; Adult; Aged; Biopsy; Breast Neoplasms – Pathology; Breast Neoplasms – Radiography; Breast Neoplasms – Ultrasonography; Breast Neoplasms/*diagnostic imaging/pathology; Elasticity Imaging Techniques/*methods; Female; Human; Humans; Mammary/*methods; Mammography; Middle Age; Middle Aged; Needle; Predictive Value of Tests; Sensitivity and Specificity; Signal-To-Noise Ratio; Ultrasonography; Ultrasonography – Methods
Creator
An entity primarily responsible for making the resource
Barr Richard G; Zhang Zheng
Description
An account of the resource
PURPOSE: To determine whether addition of quality measure (QM) of shear-wave (SW) velocity (Vs) estimation can increase SW elastography sensitivity for breast cancer. MATERIALS AND METHODS: With written informed consent, this institutional review board-approved, HIPAA-compliant study included 143 women (mean age, 48.5 years +/- 8.7) scheduled for breast biopsy. Mean lesion size was 16.4 mm +/- 11.8; 95 (66%) lesions were benign; 48 (34%), malignant. If more than one lesion was present, lesion with highest Breast Imaging Reporting and Data System (BI-RADS) category was chosen. If there were more than one with highest BI-RADS category, a lesion was randomly selected. Conventional ultrasonography (US), strain elastography, and SW elastography were performed with QM. QM assesses SW quality to provide accurate Vs. Lesions were evaluated for Vs and QM (high or low). Lesions with Vs of less than 4.5 m/sec were classified benign; lesions with Vs of 4.5 m/sec or greater, malignant. Results were correlated with pathologic findings. Vs data with or without incorporating QM were used to determine SW elastography diagnostic performance. Binomial proportions and exact 95% confidence intervals (CIs) were calculated. RESULTS: In 95 benign lesions, 13 (14%) had no SW elastography signal; 77 (81%), Vs of less than 4.5 m/sec; and five (5%), Vs of 4.5 m/sec or greater. In 48 malignant lesions, eight (17%) had no SW elastography signal; 20 (42%), Vs of less than 4.5 m/sec; and 20 (42%), V of 4.5 m/sec or greater. QM was low in 17 of 20 (85%) malignant lesions with Vs of less than 4.5 m/sec. Without QM, using Vs of 4.5 m/sec or greater as test positive, SW elastography had lesion-level sensitivity of 50% (95% CI: 34%, 66%); specificity, 94% (95% CI: 86%, 98%); positive predictive value (PPV), 80% (95% CI: 59%, 93%); and negative predictive value (NPV), 79% (95% CI: 70%, 87%). Using QM where additional lesions with both low Vs and low QM were treated as test positive, SW elastography had lesion-level sensitivity of 93% (95% CI: 80%, 98%); specificity, 89% (95% CI: 80%, 95%); PPV, 80% (95% CI: 66%, 91%); and NPV, 96% (95% CI: 89%, 99%). CONCLUSION: Addition of QM can improve SW elastography sensitivity, with no significant change in specificity.
Identifier
An unambiguous reference to the resource within a given context
<a href="http://doi.org/10.1148/radiol.14132404" target="_blank" rel="noreferrer noopener">10.1148/radiol.14132404</a>
Rights
Information about rights held in and over the resource
Article information provided for research and reference use only. All rights are retained by the journal listed under publisher and/or the creator(s).
2015
80 and over
Adolescence
Adolescent
Adult
Aged
Barr Richard G
Biopsy
Breast Neoplasms – Pathology
Breast Neoplasms – Radiography
Breast Neoplasms – Ultrasonography
Breast Neoplasms/*diagnostic imaging/pathology
Elasticity Imaging Techniques/*methods
Female
Human
Humans
Mammary/*methods
Mammography
Middle Age
Middle Aged
Needle
Predictive Value of Tests
Radiology
Sensitivity and Specificity
Signal-To-Noise Ratio
Ultrasonography
Ultrasonography – Methods
Zhang Zheng