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https://www.readbyqxmd.com/read/28075622/imaging-surveillance-after-primary-breast-cancer-treatment
#1
Diana L Lam, Nehmat Houssami, Janie M Lee
OBJECTIVE: Current clinical guidelines are consistent in supporting annual mammography for women after treatment of primary breast cancer. Surveillance imaging beyond standard digital mammography, including digital breast tomosynthesis (DBT), breast ultrasound, and MRI, may improve outcomes. This article reviews the evidence on the performance and effectiveness of breast imaging modalities available for surveillance after treatment of sporadic unilateral primary breast cancer and identifies additional factors to be considered when selecting an imaging surveillance regimen...
January 11, 2017: AJR. American Journal of Roentgenology
https://www.readbyqxmd.com/read/28075335/towards-standardization-of-x-ray-beam-filters-in-digital-mammography-and-digital-breast-tomosynthesis-monte-carlo-simulations-and-analytical-modelling
#2
Suman Shrestha, Srinivasan Vedantham, Andrew Karellas
In digital breast tomosynthesis and digital mammography, the x-ray beam filter material and thickness vary between systems. Replacing K-edge filters with Al was investigated with the intent to reduce exposure duration and to simplify system design. Tungsten target x-ray spectra were simulated with K-edge filters (50��m Rh; 50��m Ag) and Al filters of varying thickness. Monte Carlo simulations were conducted to quantify the x-ray scatter from various filters alone, scatter-to-primary ratio (SPR) with compressed breasts, and to determine the radiation dose to the breast...
January 11, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28072582/the-effect-of-system-geometry-and-dose-on-the-threshold-detectable-calcification-diameter-in-2d-mammography-and-digital-breast-tomosynthesis
#3
Andria Hadjipanteli, Premkumar Elangovan, Alistair Mackenzie, Padraig T Looney, Kevin Wells, David R Dance, Kenneth C Young
Digital breast tomosynthesis (DBT) is under consideration to replace or to be used in combination with 2D-mammography in breast screening. The aim of this study was the comparison of the detection of microcalcification clusters by human observers in simulated breast images using 2D-mammography, narrow angle (15°/15 projections) and wide angle (50°/25 projections) DBT. The effects of the cluster height in the breast and the dose to the breast on calcification detection were also tested. Simulated images of 6 cm thick compressed breasts were produced with and without microcalcification clusters inserted, using a set of image modelling tools for 2D-mammography and DBT...
February 7, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28072573/design-and-application-of-a-structured-phantom-for-detection-performance-comparison-between-breast-tomosynthesis-and-digital-mammography
#4
L Cockmartin, N W Marshall, G Zhang, K Lemmens, E Shaheen, C Van Ongeval, E Fredenberg, D R Dance, E Salvagnini, K Michielsen, H Bosmans
This paper introduces and applies a structured phantom with inserted target objects for the comparison of detection performance of digital breast tomosynthesis (DBT) against 2D full field digital mammography (FFDM). The phantom consists of a 48 mm thick breast-shaped polymethyl methacrylate (PMMA) container filled with water and PMMA spheres of different diameters. Three-dimensionally (3D) printed spiculated masses (diameter range: 3.8-9.7 mm) and non-spiculated masses (1.6-6.2 mm) along with microcalcifications (90-250 µm) were inserted as targets...
January 10, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28064435/3d-volume-reconstruction-from-serial-breast-specimen-radiographs-for-mapping-between-histology-and-3d-whole-specimen-imaging
#5
Thomy Mertzanidou, John H Hipwell, Sara Reis, David J Hawkes, Babak Ehteshami Bejnordi, Mehmet Dalmis, Suzan Vreemann, Bram Platel, Jeroen van der Laak, Nico Karssemeijer, Meyke Hermsen, Peter Bult, Ritse Mann
PURPOSE: In breast imaging, radiological in-vivo images, such as X-ray mammography and Magnetic Resonance Imaging (MRI), are used for tumour detection, diagnosis and size determination. After excision, the specimen is typically sliced into slabs and a small subset is sampled. Histopathological imaging of the stained samples is used as the gold standard for characterisation of the tumour microenvironment. A 3D volume reconstruction of the whole specimen from the 2D slabs could facilitate bridging the gap between histology and in-vivo radiological imaging...
January 8, 2017: Medical Physics
https://www.readbyqxmd.com/read/28055247/-staging-of-breast-cancer-and-the-advanced-applications-of-digital-mammogram-what-the-physician-needs-to-know
#6
Maha Hussien Helal, Sahar Mahmoud Mansour, Mai Zaglol, Lamia Adel Salaleldin, Omniya Mokhtar Nada, Marwa Anas Haggag
OBJECTIVE: To study the role of advanced applications of digital mammogram whether contrast enhanced spectral mammography (CESM) or digital breast tomosynthesis (DBT) in the "T" staging of histologically proven breast cancer prior management planning. METHODS: This prospective analysis, we evaluated 98 proved malignant breast masses regarding their size, multiplicity and presence of associated clusters of microcalcifications. Evaluation methods included digital mammography, 3-D tomosynthesis and contrast enhanced spectral mammography...
January 5, 2017: British Journal of Radiology
https://www.readbyqxmd.com/read/28053633/addition-of-digital-breast-tomosynthesis-to-full-field-digital-mammography-in-the-diagnostic-setting-additional-value-and-cancer-detectability
#7
Mirinae Seo, Jung Min Chang, Sun Ah Kim, Won Hwa Kim, Ji He Lim, Su Hyun Lee, Min Sun Bae, Hye Ryoung Koo, Nariya Cho, Woo Kyung Moon
PURPOSE: The purpose of this study was to assess the value of adding digital breast tomosynthesis (DBT) to full-field digital mammography (FFDM) in the diagnostic workup of breast cancer and to determine which lesion variables affect cancer detectability in the combined modality. METHODS: Between March and May 2012, paired FFDM and DBT images were obtained from 203 women as part of a diagnostic workup for breast cancer. Images from FFDM alone, DBT alone, and DBT combined with FFDM were reviewed in separate sessions by six blinded readers...
December 2016: Journal of Breast Cancer
https://www.readbyqxmd.com/read/28048893/mo-de-209-01-primer-on-tomosynthesis
#8
A Maidment
: Digital Breast Tomosynthesis (DBT) is rapidly replacing mammography as the standard of care in breast cancer screening and diagnosis. DBT is a form of computed tomography, in which a limited set of projection images are acquired over a small angular range and reconstructed into tomographic data. The angular range varies from 15° to 50° and the number of projections varies between 9 and 25 projections, as determined by the equipment manufacturer. It is equally valid to treat DBT as the digital analog of classical tomography - that is, linear tomography...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048364/we-fg-207a-01-introduction-to-dedicated-breast-ct-early-studies
#9
S Vedantham
: Mammography-based screening has been a valuable imaging tool for the early detection of non-palpable lesions and has contributed to significant reduction in breast cancer associated mortality. However, the breast imaging community recognizes that mammography is not ideal, and in particular is inferior for women with dense breasts. Also, the 2-D projection of a 3-D organ results in tissue superposition contributing to false-positives. The sensitivity of mammography is breast-density dependent...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048241/mo-de-209-02-tomosynthesis-reconstruction-methods
#10
J Mainprize
: Digital Breast Tomosynthesis (DBT) is rapidly replacing mammography as the standard of care in breast cancer screening and diagnosis. DBT is a form of computed tomography, in which a limited set of projection images are acquired over a small angular range and reconstructed into tomographic data. The angular range varies from 15° to 50° and the number of projections varies between 9 and 25 projections, as determined by the equipment manufacturer. It is equally valid to treat DBT as the digital analog of classical tomography - that is, linear tomography...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048058/mo-de-209-04-radiation-dosimetry-in-breast-tomosynthesis
#11
I Sechopoulos
: Digital Breast Tomosynthesis (DBT) is rapidly replacing mammography as the standard of care in breast cancer screening and diagnosis. DBT is a form of computed tomography, in which a limited set of projection images are acquired over a small angular range and reconstructed into tomographic data. The angular range varies from 15° to 50° and the number of projections varies between 9 and 25 projections, as determined by the equipment manufacturer. It is equally valid to treat DBT as the digital analog of classical tomography - that is, linear tomography...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047850/we-de-207b-08-towards-standardization-of-x-ray-filters-in-digital-mammography-enabled-breast-tomosynthesis-systems
#12
S Shrestha, S Vedantham, A Karellas
PURPOSE: In digital breast tomosynthesis (DBT) systems capable of digital mammography (DM), Al filters are used during DBT and K-edge filters during DM. The potential for standardizing the x-ray filters with Al, instead of K-edge filters, was investigated with intent to reduce exposure duration and to promote a simpler system design. METHODS: Analytical computations of the half-value thickness (HVT) and the photon fluence per mAs (photons/mm2/mAs) for K-edge filters (50µm Rh; 50µm Ag) were compared with Al filters of varying thickness...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047717/we-fg-207a-02-why-we-need-breast-ct-clinical-perspective
#13
A O'Connell
: Mammography-based screening has been a valuable imaging tool for the early detection of non-palpable lesions and has contributed to significant reduction in breast cancer associated mortality. However, the breast imaging community recognizes that mammography is not ideal, and in particular is inferior for women with dense breasts. Also, the 2-D projection of a 3-D organ results in tissue superposition contributing to false-positives. The sensitivity of mammography is breast-density dependent...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047595/mo-de-209-03-assessing-image-quality
#14
W Zhao
: Digital Breast Tomosynthesis (DBT) is rapidly replacing mammography as the standard of care in breast cancer screening and diagnosis. DBT is a form of computed tomography, in which a limited set of projection images are acquired over a small angular range and reconstructed into tomographic data. The angular range varies from 15° to 50° and the number of projections varies between 9 and 25 projections, as determined by the equipment manufacturer. It is equally valid to treat DBT as the digital analog of classical tomography - that is, linear tomography...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047520/we-fg-207a-05-dedicated-breast-ct-as-a-diagnostic-imaging-tool-physics-and-clinical-feasibility
#15
A Karellas
: Mammography-based screening has been a valuable imaging tool for the early detection of non-palpable lesions and has contributed to significant reduction in breast cancer associated mortality. However, the breast imaging community recognizes that mammography is not ideal, and in particular is inferior for women with dense breasts. Also, the 2-D projection of a 3-D organ results in tissue superposition contributing to false-positives. The sensitivity of mammography is breast-density dependent...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047248/tu-fg-209-01-a-model-of-noise-anisotropy-in-amorphous-selenium-digital-detectors
#16
R Acciavatti, A Maidment
PURPOSE: One of the main advantages of amorphous selenium (a-Se) photoconductors is high spatial resolution. It has also been shown that the noise power spectra (NPS) is effectively white (frequency-independent) at various angles of x-ray incidence. One limitation of previous studies on NPS is that the effect of digitization has not been modeled. This work demonstrates that the NPS becomes colored (frequency-dependent) once digitization is taken into account. METHODS: A mammography system is modeled by tracing rays between the focal spot and the detector...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047068/we-fg-207a-03-low-dose-cone-beam-breast-ct-physics-and-technology-development
#17
J Boone
: Mammography-based screening has been a valuable imaging tool for the early detection of non-palpable lesions and has contributed to significant reduction in breast cancer associated mortality. However, the breast imaging community recognizes that mammography is not ideal, and in particular is inferior for women with dense breasts. Also, the 2-D projection of a 3-D organ results in tissue superposition contributing to false-positives. The sensitivity of mammography is breast-density dependent...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046829/mo-de-209-00-dbt-physics-basic-to-advanced
#18
Andrew D Maidment
: Digital Breast Tomosynthesis (DBT) is rapidly replacing mammography as the standard of care in breast cancer screening and diagnosis. DBT is a form of computed tomography, in which a limited set of projection images are acquired over a small angular range and reconstructed into tomographic data. The angular range varies from 15° to 50° and the number of projections varies between 9 and 25 projections, as determined by the equipment manufacturer. It is equally valid to treat DBT as the digital analog of classical tomography - that is, linear tomography...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046738/su-f-i-53-coded-aperture-coherent-scatter-spectral-imaging-of-the-breast-a-monte-carlo-evaluation-of-absorbed-dose
#19
R Morris, M Lakshmanan, G Fong, A Kapadia, J Greenberg
PURPOSE: Coherent scatter based imaging has shown improved contrast and molecular specificity over conventional digital mammography however the biological risks have not been quantified due to a lack of accurate information on absorbed dose. This study intends to characterize the dose distribution and average glandular dose from coded aperture coherent scatter spectral imaging of the breast. The dose deposited in the breast from this new diagnostic imaging modality has not yet been quantitatively evaluated...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046698/mo-fg-campus-iep1-02-dose-reduction-in-contrast-enhanced-digital-mammography-using-a-photon-counting-detector
#20
S Lee, S Kang, J Eom
PURPOSE: Photon-counting detectors (PCDs) allow multi-energy X-ray imaging without additional exposures and spectral overlap. This capability results in the improvement of accuracy of material decomposition for dual-energy X-ray imaging and the reduction of radiation dose. In this study, the PCD-based contrast-enhanced dual-energy mammography (CEDM) was compared with the conventional CDEM in terms of radiation dose, image quality and accuracy of material decomposition. METHODS: A dual-energy model was designed by using Beer-Lambert's law and rational inverse fitting function for decomposing materials from a polychromatic X-ray source...
June 2016: Medical Physics
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