scholarly journals The Value of CT Three-Dimensional Reconstruction in Nursing and Diagnosis of Senile Hip Fracture

2021 ◽  
Vol 2021 ◽  
pp. 1-4
Author(s):  
Yuanyuan Shi ◽  
Si Chen ◽  
Xue Chen ◽  
Pan Xue
Keyword(s):  
Hip Fracture ◽  
3D Reconstruction ◽  
Ct Scan ◽  
Three Dimensional ◽  
The Elderly ◽  
Three Dimensional Reconstruction ◽  
X Ray ◽  
Dimensional Reconstruction ◽  
Bone Fragments ◽  
Conventional Ct

Aim. To study the diagnostic effect of hip fracture in the elderly. In this paper, a total of 100 elderly patients with hip fracture from January 2020 to May 2021 were selected for X-ray and CT examination after admission. The operation was taken as the final criteria for determining hip fracture type, and the diagnosis of hip fracture by CT three-dimensional reconstruction was analyzed and studied. The results showed that the diagnostic rate of CT 3D reconstruction for various types of hip fracture in the elderly was higher than that of CT plain scan and X-ray ( P < 0.05 ). For the diagnosis of intra-articular small bone fragments, the rate of missed diagnosis was 2% (2/100) with CT 3D reconstruction, 10% (10/100) with conventional CT scan, and 20% (20/100) with X-ray. The rate of misdiagnosis was 5.0% (5/100) with CT 3D reconstruction. Routine CT scan was 15% (15/100), X-ray was 30% (30/100), and CT 3D reconstruction was significantly lower than other examinations ( P < 0.05 ). Conclusion. CT 3D reconstruction has high accuracy in the diagnosis of various types of hip fractures in the elderly.

scholarly journals Online Measurement of Deposit Surface in Electron Beam Freeform Fabrication

Sensors ◽  
2019 ◽  
Vol 19 (18) ◽  
pp. 4001 ◽  
Author(s):  
Shuhe Chang ◽  
Haoyu Zhang ◽  
Haiying Xu ◽  
Xinghua Sang ◽  
Li Wang ◽  
...  
Keyword(s):  
Electron Beam ◽  
3D Reconstruction ◽  
Three Dimensional ◽  
Thermal Conditions ◽  
Online Measurement ◽  
Three Dimensional Reconstruction ◽  
Continuous Change ◽  
Position Information ◽  
Freeform Fabrication ◽  
Dimensional Reconstruction

In the process of electron beam freeform fabrication (EBF3), due to the continuous change of thermal conditions and variability in wire feeding in the deposition process, geometric deviations are generated in the deposition of each layer. In order to prevent the layer-by-layer accumulation of the deviation, it is necessary to perform online geometry measurement for each deposition layer, based on which the error compensation can be done for the previous deposition layer in the next deposition layer. However, the traditional three-dimensional reconstruction method that employs structured laser cannot meet the requirements of long-term stable operation in the manufacturing process of EBF3. Therefore, this paper proposes a method to measure the deposit surfaces based on the position information of electron beam speckle, in which an electron beam is used to bombard the surface of the deposit to generate the speckle. Based on the structured information of the electron beam in the vacuum chamber, the three-dimensional reconstruction of the surface of the deposited parts is realized without need of additional structured laser sensor. In order to improve the detection accuracy, the detection error is theoretically analyzed and compensated. The absolute error after compensation is smaller than 0.1 mm, and the precision can reach 0.1%, which satisfies the requirements of 3D reconstruction of the deposited parts. An online measurement system is built for the surface of deposited parts in the process of electron beam freeform fabrication, which realizes the online 3D reconstruction of the surface of the deposited layer. In addition, in order to improve the detection stability of the whole system, the image processing algorithm suitable for this scene is designed. The reliability and speed of the algorithm are improved by ROI extraction, threshold segmentation, and expansion corrosion. In addition, the speckle size information can also reflect the thermal conditions of the surface of the deposited parts. Hence, it can be used for online detection of defects such as infusion and voids.

Three dimensional reconstruction of CT scan images to aid the cardiac surgeon

2004 ◽  
Vol 16 (3) ◽  
pp. 249-254 ◽  
Author(s):  
Francis D. Ferdinand ◽  
Mark Heiman ◽  
Sharon Ben-Or ◽  
Andrew J. Curtain ◽  
Scott M. Goldman
Keyword(s):  
Ct Scan ◽  
Three Dimensional ◽  
Three Dimensional Reconstruction ◽  
Dimensional Reconstruction ◽  
Cardiac Surgeon

scholarly journals Three-dimensional reconstruction of human nipple using refraction-contrast x-ray computed Tomography

2019 ◽  
Author(s):  
Naoki Sunaguchi ◽  
Daisuke Shimao ◽  
Shu Ichihara ◽  
Kensaku Mori ◽  
Tetsuya Yuasa ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Three Dimensional ◽  
Three Dimensional Reconstruction ◽  
X Ray ◽  
Dimensional Reconstruction ◽  
X Ray Computed

scholarly journals A feasibility study of full-field X-ray orientation microscopy at the onset of deformation twinning

2016 ◽  
Vol 49 (2) ◽  
pp. 544-555 ◽  
Author(s):  
Nicola Viganò ◽  
Laura Nervo ◽  
Lorenzo Valzania ◽  
Gaurav Singh ◽  
Michael Preuss ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Deformation Twinning ◽  
Diffraction Spot ◽  
Al Alloy ◽  
Three Dimensional Reconstruction ◽  
Full Field ◽  
X Ray ◽  
Orientation Microscopy ◽  
Simultaneous Reconstruction ◽  
Dimensional Reconstruction

Three-dimensional X-ray orientation microscopy based on X-ray full-field imaging techniques such as diffraction contrast tomography is a challenging task when it comes to materials displaying non-negligible intragranular orientation spread and/or intricate grain microstructures as a result of plastic deformation and deformation twinning. As shown in this article, the optimization of the experimental conditions and a number of modifications of the data analysis routines enable detection and three-dimensional reconstruction of twin lamellae down to micrometre thickness, as well as more accurate three-dimensional reconstruction of grains displaying intragranular orientation spreads of up to a few degrees. The reconstruction of spatially resolved orientation maps becomes possible through the use of a recently introduced six-dimensional reconstruction framework, which has been further extended in order to enable simultaneous reconstruction of parent and twin orientations and to account for the finite impulse response of the X-ray imaging detector. The simultaneous reconstruction of disjoint orientation domains requires appropriate scaling of the scattering intensities based on structure and Lorentz factors and yields three-dimensional reconstructions with comparable density values for all the grains. This in turn enables the use of a global intensity-guided assembly procedure and avoids problems related to the single-grain thresholding procedure used previously. Last but not least, carrying out a systematic search over the list of known twin variants (forward modelling) for each of the indexed parent grains, it is possible to identify additional twins which have been left undetected at the previous stage of grain indexing based on diffraction spot peak positions. The enhanced procedure has been tested on a 1% deformed specimen made from a Ti–4% Al alloy and the result has been cross-validated against a two-dimensional electron backscatter diffraction orientation map acquired on one of the lateral sample surfaces.

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