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 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

Three-dimensional imaging and characterization of the oxide scale formed on a polycrystalline nickel-based superalloy

2019 ◽  
Vol 167 ◽  
pp. 16-20 ◽  
Author(s):  
Sebastian Lech ◽  
Adam Kruk ◽  
Aleksander Gil ◽  
Grzegorz Cempura ◽  
Alina Agüero ◽  
...  
Keyword(s):  
Oxide Scale ◽  
Three Dimensional ◽  
Polycrystalline Nickel ◽  
Three Dimensional Imaging ◽  
Nickel Based Superalloy

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).

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.

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