scholarly journals A comparative study of promising filter materials for neutron imaging facilities

2021 ◽  
Vol 5 (4) ◽  
pp. 169-180
Author(s):  
K. M. Nazarov ◽  
S. E. Kichanov ◽  
E. V. Lukin ◽  
I. Yu. Zel ◽  
D. P. Kozlenko ◽  
...  
Keyword(s):  
Single Crystal ◽  
Gamma Rays ◽  
Neutron Imaging ◽  
Radiographic Images ◽  
Filter Materials ◽  
Bismuth Single Crystal ◽  
Thermal Neutron Beam ◽  
Single Crystal Sapphire ◽  
Tomography Data

The effect of sapphire and bismuth single-crystal filters and their combinations on the quality of neutron radiographic images and neutron tomography data has been studied. The parameters of the contrast of the neutron image were analyzed depending on the monocrystalline filters. Neutron transmission spectra were obtained for sapphire and bismuth single crystals. Additionally, the effect of filters on the overall intensity of the thermal neutron beam and the background of gamma-rays was investigated. Based on the obtained data, we assume that a single-crystal sapphire filter can be most effectively used for radiographic and tomographic installations using thermal neutrons.

scholarly journals Focused Ion Beam Milling of Single-Crystal Sapphire with A-, C-, and M-Orientations

Materials ◽  
2020 ◽  
Vol 13 (12) ◽  
pp. 2871
Author(s):  
Qiuling Wen ◽  
Xinyu Wei ◽  
Feng Jiang ◽  
Jing Lu ◽  
Xipeng Xu
Keyword(s):  
Single Crystal ◽  
Surface Quality ◽  
Material Removal ◽  
Focused Ion Beam ◽  
Removal Rate ◽  
Ion Beam ◽  
Crystal Orientations ◽  
Aluminum Ions ◽  
Single Crystal Sapphire

Sapphire substrates with different crystal orientations are widely used in optoelectronic applications. In this work, focused ion beam (FIB) milling of single-crystal sapphire with A-, C-, and M-orientations was performed. The material removal rate (MRR) and surface roughness (Sa) of sapphire with the three crystal orientations after FIB etching were derived. The experimental results show that: The MRR of A-plane sapphire is slightly higher than that of C-plane and M-plane sapphires; the Sa of A-plane sapphire after FIB treatment is the smallest among the three different crystal orientations. These results imply that A-plane sapphire allows easier material removal during FIB milling compared with C-plane and M-plane sapphires. Moreover, the surface quality of A-plane sapphire after FIB milling is better than that of C-plane and M-plane sapphires. The theoretical calculation results show that the removal energy of aluminum ions and oxygen ions per square nanometer on the outermost surface of A-plane sapphire is the smallest. This also implies that material is more easily removed from the surface of A-plane sapphire than the surface of C-plane and M-plane sapphires by FIB milling. In addition, it is also found that higher MRR leads to lower Sa and better surface quality of sapphire for FIB etching.

Effect of Image Display on the Quality of Multiplanar Reconstruction of Computed Tomography Data

1993 ◽  
Vol 28 (2) ◽  
pp. 146-149 ◽  
Author(s):  
ELLIOT K. FISHMAN ◽  
DEREK R. NEY ◽  
AKIRA KAWASHIMA ◽  
WILLIAM W. SCOTT ◽  
DOUGLAS D. ROBERTSON
Keyword(s):  
Computed Tomography ◽  
Image Display ◽  
Multiplanar Reconstruction ◽  
Tomography Data

Initial bone-implant interfaces of submergible and supramergible endosseous single-crystal sapphire implants

1986 ◽  
Vol 55 (1) ◽  
pp. 96-100 ◽  
Author(s):  
Yasumasa Akagawa ◽  
Masaki Hashimoto ◽  
Noriaki Kondo ◽  
Keiichi Satomi ◽  
Takashi Takata ◽  
...  
Keyword(s):  
Single Crystal ◽  
Bone Implant ◽  
Single Crystal Sapphire

Initial Stages of Growth of Barium Zirconate Titanate and Barium Stannate Titanate Films on Single-Crystal Sapphire and Silicon Carbide

2018 ◽  
Vol 60 (10) ◽  
pp. 2091-2096
Author(s):  
A. V. Tumarkin ◽  
M. V. Zlygostov ◽  
I. T. Serenkov ◽  
V. I. Sakharov ◽  
V. V. Afrosimov ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Single Crystal ◽  
Barium Zirconate ◽  
Stages Of Growth ◽  
Barium Zirconate Titanate ◽  
Barium Stannate ◽  
Zirconate Titanate ◽  
Single Crystal Sapphire

Development of laboratory x-ray fluorescence holography equipment

2003 ◽  
Vol 18 (6) ◽  
pp. 1471-1473 ◽  
Author(s):  
Yukio Takahashi ◽  
Kouichi Hayashi ◽  
Kimio Wakoh ◽  
Naomi Nishiki ◽  
Eiichiro Matsubara
Keyword(s):  
Single Crystal ◽  
Count Rate ◽  
Detection System ◽  
High Count ◽  
Synchrotron Source ◽  
High Count Rate ◽  
X Ray ◽  
Graphite Monochromator ◽  
Time Required

Laboratory x-ray fluorescence holography equipment was developed. A single-bent graphite monochromator with a large curvature and a high-count-rate x-ray detection system were applied in this equipment. To evaluate the performance of this equipment, a hologram pattern of a gold single crystal was measured. It took two days, which was about one-third the time required for the previous measurements using the conventional x-ray source and several times that using the synchrotron source. The quality of the hologram pattern is as good as that obtained using the synchrotrons. Clear atomic images on (002) are reconstructed.

scholarly journals Odontomas and imaging diagnosis: the concise systematic review

2021 ◽  
Vol 2 (5) ◽  
Author(s):  
João Paulo Dessy Millan ◽  
Bárbara Castelli Gutinik ◽  
Lucas Louzada Mendes de Lima ◽  
Ana Katharina Gomes Teles ◽  
Tagnã Aparecido Martins ◽  
...  
Keyword(s):  
Systematic Review ◽  
Risk Of Bias ◽  
Radiographic Examination ◽  
Radiographic Images ◽  
Radiographic Appearance ◽  
Tooth Impaction ◽  
Complex Odontoma ◽  
Odontogenic Origin ◽  
Bone Structures

Introduction: Odontomas are tumors of odontogenic origin. They represent on average 70% of all odontogenic tumors found. Early diagnosis and treatment prevent the loss of tissue element, tooth impaction, bone malformations, and displacement of bone structures, differentiating their types through panoramic radiographic images. Objective: To carry out a concise systematic review of the characteristics of odontomas, differentiating their types through panoramic radiographic images. Methods: The research was carried out from May 2021 to June 2021 and developed based on Scopus, PubMed, Science Direct, Scielo, and Google Scholar, following the Systematic Review-PRISMA rules. The quality of the studies was based on the GRADE instrument and the risk of bias was analyzed according to the Cochrane instrument. Results: A total of 84 articles were found. A total of 36 articles were evaluated in full and 17 were included and evaluated in the present study. A total of 3 Studies with a High Risk of Bias and 1 Study with Uncertain Risk. Radiographic examination is extremely important for the study and diagnosis of odontomas. Odontomas present a characteristic radiographic appearance. In complex odontomas, radiopacity is not specifically determined, showing itself as an irregular and disorganized mass surrounded by a narrow radiolucent zone. In the composite type, the radiographic image is pathognomonic. In the radiopaque image, dozens of denticles simulate small teeth surrounded by a thin radiolucent area. Composite odontoma, on the other hand, consists of the same calcified structures arranged in an orderly and related manner, similar to normal teeth contained in a fibrous capsule. The differential diagnosis of complex odontoma includes osteomas and condensing osteitis. Conclusion: Radiographic and/or tomographic examination is the best way to obtain an accurate diagnosis, precisely delimiting the lesion and nearby and involved structures.

Sign in / Sign up

Export Citation Format

Share Document