scholarly journals Characterization of Breast Lesions: Comparison between Three-dimensional Ultrasound and Automated Volume Breast Ultrasound

2021 ◽  
Vol 5 (3) ◽  
pp. 204
Author(s):  
Jia, MD Wanru ◽  
Zhang, MD Jingwen, ◽  
Dong, MD Yijie ◽  
Zhu, MD Ying ◽  
Jia, MD Xiaohong ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Breast Ultrasound ◽  
Breast Lesions

scholarly journals The impact of contrast-enhanced spectral mammogram (CESM) and three-dimensional breast ultrasound (3DUS) on the characterization of the disease extend in cancer patients

2018 ◽  
pp. 20170977 ◽  
Author(s):  
Maha Hussien Helal ◽  
Sahar Mahmoud Mansour ◽  
Lamia Adel Salaleldin ◽  
Basma Mohamed Alkalaawy ◽  
Dorria Saleh Salem ◽  
...  
Keyword(s):  
Cancer Patients ◽  
Three Dimensional ◽  
Breast Ultrasound ◽  
Contrast Enhanced ◽  
The Impact

Dynamic three-dimensional imaging with partial k-space sampling: initial application for gadolinium-enhanced rate characterization of breast lesions.

Radiology ◽  
1995 ◽  
Vol 196 (1) ◽  
pp. 135-142 ◽  
Author(s):  
T L Chenevert ◽  
M A Helvie ◽  
A M Aisen ◽  
I R Francis ◽  
D D Adler ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Breast Lesions ◽  
Three Dimensional Imaging ◽  
Initial Application

scholarly journals Three-dimensional tomosynthesis versus two-dimensional mammography in detection and characterization of different breast lesions

2021 ◽  
Vol 52 (1) ◽  
Author(s):  
Samia Aboelnour Abdeltwab Abdelattef ◽  
Suzan Farouk Ibrahim ◽  
Wafaa Raft Abdelhamid ◽  
Fatten Mohamed Mahmoud
Keyword(s):  
Breast Cancer ◽  
Three Dimensional ◽  
Digital Breast Tomosynthesis ◽  
Final Diagnosis ◽  
Recall Rate ◽  
Architectural Distortion ◽  
Breast Lesions ◽  
Predictive Values ◽  
Sensitivity Specificity

Abstract Background Breast cancer is considered the most serious lesion among different breast lesions. Mammography is the corner stone for screening for detection of breast cancer. It has been modified to digital mammography (DM) and then to digital breast tomosynthesis (DBT). Tomosynthesis is an emerging technique for diagnosis and screening of breast lesions. The aim of this study is to interrogate whether the addition of DBT to DM helps in better detection and characterization of different breast lesions. Methods This is a prospective study carried on 38 female patients according to our inclusion criteria. All patients were evaluated by using DM alone and thereafter with the addition of DBT to DM. Recall rate was calculated, and the imaging findings of each case were correlated with the final diagnosis and follow-up. Results DM identified 32 lesions while DBT with DM identified 37 lesions. On DM alone, 17 lesions were characterized as masses, 5 as focal asymmetry, 2 as architectural distortion, 7 as microcalcification and 1 as macrocalcification. With the addition of DBT, 27 lesions were characterized as masses, 1 as focal asymmetry, 1 as architectural distortion, 7 as microcalcification and 1 as macrocalcification. So, there were better detection and characterization of lesions with the addition of DBT than DM alone. The sensitivity, specificity, AUC, positive and negative predictive values were significantly higher with the addition of DBT to DM (100%, 90.5%, 0.952, 90% and 100%, respectively) than with DM (77.8%, 80.9%, 0.794, 77.8% and 80.9%, respectively) for all breast lesions. Conclusions The addition of DBT to DM helps in better detection and characterization of different breast lesions. This leads to early detection of breast cancer, improvement of the performance of radiologists and saving time by reduction of recall rate.

scholarly journals Role of Tomosynthesis with correlation to 2D Mammography in characterization of breast lesions in dense breast

QJM ◽  
2020 ◽  
Vol 113 (Supplement_1) ◽  
Author(s):  
A M Elshibiny ◽  
M E Abdelrahman ◽  
L M Abdelrahman
Keyword(s):  
Digital Mammography ◽  
New Technology ◽  
Malignant Lesion ◽  
Three Dimensional ◽  
Digital Breast Tomosynthesis ◽  
Individual Performance ◽  
Dense Breast ◽  
P Value ◽  
Breast Lesions

Abstract Background Digital Breast Tomosythesis is a new technology of digital mammography that enables the acquisition of three dimensional volume of thin section data, and thus reduces or eliminates tissue overlap especially in dense breast, such ability allow visualization of cancers not apparent by digital mammography and differentiate between benign and malignant lesion. Objectives to compare the efficacy of digital breast Tomosynthesis (BDT) to digital Mammography (DM) in diagnosis of different breast lesions in dense breast. Patients and Method in this prospective study 30 patients with breast density ACR/C and ACR/D were assessed by Digital Mammography and Digital Breast Tomsynthesis. Each lesion was assigned a blinded category in an individual performance for each modality. The resultant BI-RADS categories were correlated with report of the pathology specimens or outcome follow up. Results Both modalities were compared regarding characterization, using Chi Square test (p value:0.035).The sensitivity, specificity and accuracy of digital mammography was 62.5%, 68.75% and 66% have significantly increase with tomosynthesis to be 100%,91% and 97% respectively. Conclusion Digital breast tomosythesis significantly enhanced characterization of breast lesions than digital mammography in dense breast parenchyma (ACR/C and ACR/D).

scholarly journals Does automated breast ultrasound (ABUS) add to breast tomosynthesis (DBT) in assessment of lesions in dense breasts?

2021 ◽  
Vol 52 (1) ◽  
Author(s):  
Rania Mohamed Hegazy ◽  
Omnia Mokhtar Nada ◽  
Engy A. Ali
Keyword(s):  
Digital Mammography ◽  
Breast Ultrasound ◽  
Architectural Distortion ◽  
Breast Lesions ◽  
Breast Tomosynthesis ◽  
Full Field ◽  
Dense Breasts ◽  
The Masses ◽  
Automated Breast Ultrasound

Abstract Background As mammography has its known limitations in dense breast, additional imaging is usually needed. We aimed to evaluate the role of automated breast ultrasound in addition to tomosynthesis in detection and diagnosis of breast lesions in dense breasts. Seventy patients with dense breasts subjected to full-field digital mammography (FFDM) including digital breast tomosynthesis (DBT) and automated breast ultrasound (ABUS). Both studies were evaluated by two experienced radiologists to assess breast composition, mass characterization, asymmetry, calcification, axillary lymphadenopathy, extent of disease (EOD), skin thickening, retraction, architectural distortion, and BIRADS classification. All breast masses were interpreted as above described and then correlated with final pathological diagnosis. Results Study included 70 females presenting with different types of breast lesions. Eighty-two masses were detected: 53 benign (n = 53/82), 29 malignant (n = 29/82). Histopathology of the masses was reached by core biopsy (n = 30), FNAC (n = 14), and excisional biopsy (n = 11). The rest of the masses (n = 27/82) were confirmed by their characteristic sonographic appearances; 20 cases of multiple bilateral anechoic simple cysts, 7 typical fibroadenomas showed stationary course on follow-up. As regards the final BIRADS score given for both modalities, tomosynthesis showed accuracy of 93.1% in characterization of malignant masses with accuracy of 94.3% in benign masses, on the other hand automated ultrasound showed 100% accuracy in characterization of malignant masses with 98.1% accuracy in benign masses. Conclusion Adding ABUS to tomosynthesis has proven a valuable imaging tool for characterization of breast lesions in dense breasts both as screening and diagnostic tool. They proved to be more sensitive and specific than digital mammography alone in showing tissue overlap, tumor characterization, lesion margins, extent, and multiplicity of malignant lesions.

Characterization of photosystem II with the atomic-force microscope

1992 ◽  
Vol 50 (2) ◽  
pp. 1146-1147
Author(s):  
Kathleen M. Marr ◽  
Mary K. Lyon
Keyword(s):  
Photosystem Ii ◽  
Atomic Force Microscope ◽  
Three Dimensional ◽  
Biologically Active ◽  
Atomic Force ◽  
Freeze Etching ◽  
Image Averaging ◽  
Oxygen Evolving ◽  
Averaging Techniques

Photosystem II (PSII) is different from all other reaction centers in that it splits water to evolve oxygen and hydrogen ions. This unique ability to evolve oxygen is partly due to three oxygen evolving polypeptides (OEPs) associated with the PSII complex. Freeze etching on grana derived insideout membranes revealed that the OEPs contribute to the observed tetrameric nature of the PSIl particle; when the OEPs are removed, a distinct dimer emerges. Thus, the surface of the PSII complex changes dramatically upon removal of these polypeptides. The atomic force microscope (AFM) is ideal for examining surface topography. The instrument provides a topographical view of individual PSII complexes, giving relatively high resolution three-dimensional information without image averaging techniques. In addition, the use of a fluid cell allows a biologically active sample to be maintained under fully hydrated and physiologically buffered conditions. The OEPs associated with PSII may be sequentially removed, thereby changing the surface of the complex by one polypeptide at a time.

convergent-beam diffraction from surfaces

1987 ◽  
Vol 45 ◽  
pp. 30-33
Author(s):  
J. A. Eades ◽  
A. E. Smith ◽  
D. F. Lynch
Keyword(s):  
Reciprocal Lattice ◽  
Three Dimensional ◽  
Grazing Incidence ◽  
Three Dimensions ◽  
Plane Figure ◽  
Transmission Electron ◽  
Convergent Beam ◽  
Beam Patterns ◽  
Beam Diffraction

It is quite simple (in the transmission electron microscope) to obtain convergent-beam patterns from the surface of a bulk crystal. The beam is focussed onto the surface at near grazing incidence (figure 1) and if the surface is flat the appropriate pattern is obtained in the diffraction plane (figure 2). Such patterns are potentially valuable for the characterization of surfaces just as normal convergent-beam patterns are valuable for the characterization of crystals.There are, however, several important ways in which reflection diffraction from surfaces differs from the more familiar electron diffraction in transmission.GeometryIn reflection diffraction, because of the surface, it is not possible to describe the specimen as periodic in three dimensions, nor is it possible to associate diffraction with a conventional three-dimensional reciprocal lattice.

Construction of plastic contact deformation maps on ceramics: a case study on aluminum nitride

1996 ◽  
Vol 54 ◽  
pp. 636-637
Author(s):  
D. L. Callahan
Keyword(s):  
Plastic Deformation ◽  
Aluminum Nitride ◽  
Mechanical Response ◽  
Three Dimensional ◽  
Bright Field Image ◽  
Perfectly Plastic ◽  
Contrast Analysis ◽  
Deformation Patterns

Modern polishing, precision machining and microindentation techniques allow the processing and mechanical characterization of ceramics at nanometric scales and within entirely plastic deformation regimes. The mechanical response of most ceramics to such highly constrained contact is not predictable from macroscopic properties and the microstructural deformation patterns have proven difficult to characterize by the application of any individual technique. In this study, TEM techniques of contrast analysis and CBED are combined with stereographic analysis to construct a three-dimensional microstructure deformation map of the surface of a perfectly plastic microindentation on macroscopically brittle aluminum nitride.The bright field image in Figure 1 shows a lg Vickers microindentation contained within a single AlN grain far from any boundaries. High densities of dislocations are evident, particularly near facet edges but are not individually resolvable. The prominent bend contours also indicate the severity of plastic deformation. Figure 2 is a selected area diffraction pattern covering the entire indentation area.

Characterization of a monolayer graphitic structure

1994 ◽  
Vol 52 ◽  
pp. 760-761
Author(s):  
X. Lin ◽  
X. K. Wang ◽  
V. P. Dravid ◽  
J. B. Ketterson ◽  
R. P. H. Chang
Keyword(s):  
Three Dimensional ◽  
Single Layer ◽  
Synthesis Process ◽  
Graphitic Structure ◽  
Positive Gaussian Curvature ◽  
Graphitic Sheet ◽  
Structural And Electronic Properties ◽  
New Material ◽  
Hexagonal Network

For small curvatures of a graphitic sheet, carbon atoms can maintain their preferred sp2 bonding while allowing the sheet to have various three-dimensional geometries, which may have exotic structural and electronic properties. In addition the fivefold rings will lead to a positive Gaussian curvature in the hexagonal network, and the sevenfold rings cause a negative one. By combining these sevenfold and fivefold rings with sixfold rings, it is possible to construct complicated carbon sp2 networks. Because it is much easier to introduce pentagons and heptagons into the single-layer hexagonal network than into the multilayer network, the complicated morphologies would be more common in the single-layer graphite structures. In this contribution, we report the observation and characterization of a new material of monolayer graphitic structure by electron diffraction, HREM, EELS.The synthesis process used in this study is reported early. We utilized a composite anode of graphite and copper for arc evaporation in helium.

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