scholarly journals The way we were (and how we got here): fifty years of technology changes in dental and maxillofacial radiology

2020 ◽  
pp. 20200133 ◽  
Author(s):  
Roberto Molteni
Keyword(s):  
Cone Beam Ct ◽  
Cone Beam ◽  
Maxillofacial Radiology ◽  
Technological Changes ◽  
X Ray ◽  
Technology Changes ◽  
The World ◽  
History Of ◽  
Phosphor Plates ◽  
Different Parts

The history of the last 50 years (1970–2020) of technological changes and progresses for equipment and procedures in dental and maxillofacial radiology is related from the insider perspective of an industrial physicist and technologist who has been instrumental at innovating and developing medical equipment in different parts of the world. The onset and improvement of all major categories of dental and maxillofacial radiographic equipment is presented, from the standpoint of their practical acceptance and impact among common dentists and maxillofacial radiologists: X-ray sources and detectors for intraoral radiography, and panoramic systems, both film-based and digital (including photo-stimulated phosphor plates); and cone beam CT.

Christianity in the Twentieth Century

2019 ◽  
Author(s):  
Brian Stanley
Keyword(s):  
Latin America ◽  
Racial Identity ◽  
Sub Saharan Africa ◽  
Central Importance ◽  
Regional Survey ◽  
History Of Christianity ◽  
The World ◽  
History Of ◽  
Sub Saharan ◽  
Different Parts

This book charts the transformation of one of the world's great religions during an age marked by world wars, genocide, nationalism, decolonization, and powerful ideological currents, many of them hostile to Christianity. The book traces how Christianity evolved from a religion defined by the culture and politics of Europe to the expanding polycentric and multicultural faith it is today—one whose growing popular support is strongest in sub-Saharan Africa, Latin America, China, and other parts of Asia. The book sheds critical light on themes of central importance for understanding the global contours of modern Christianity, illustrating each one with contrasting case studies, usually taken from different parts of the world. Unlike other books on world Christianity, this one is not a regional survey or chronological narrative, nor does it focus on theology or ecclesiastical institutions. The book provides a history of Christianity as a popular faith experienced and lived by its adherents, telling a compelling and multifaceted story of Christendom's fortunes in Europe, North America, and across the rest of the globe. It demonstrates how Christianity has had less to fear from the onslaughts of secularism than from the readiness of Christians themselves to accommodate their faith to ideologies that privilege racial identity or radical individualism.

scholarly journals A Method to Improve Electron Density Measurement of Cone-Beam CT Using Dual Energy Technique

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Kuo Men ◽  
Jian-Rong Dai ◽  
Ming-Hui Li ◽  
Xin-Yuan Chen ◽  
Ke Zhang ◽  
...  
Keyword(s):  
Electron Density ◽  
Cone Beam Ct ◽  
Density Measurement ◽  
Dual Energy ◽  
Cone Beam ◽  
Imaging Method ◽  
Basis Material ◽  
X Ray ◽  
Dual Energy Imaging ◽  
Set Up

Purpose. To develop a dual energy imaging method to improve the accuracy of electron density measurement with a cone-beam CT (CBCT) device.Materials and Methods. The imaging system is the XVI CBCT system on Elekta Synergy linac. Projection data were acquired with the high and low energy X-ray, respectively, to set up a basis material decomposition model. Virtual phantom simulation and phantoms experiments were carried out for quantitative evaluation of the method. Phantoms were also scanned twice with the high and low energy X-ray, respectively. The data were decomposed into projections of the two basis material coefficients according to the model set up earlier. The two sets of decomposed projections were used to reconstruct CBCT images of the basis material coefficients. Then, the images of electron densities were calculated with these CBCT images.Results. The difference between the calculated and theoretical values was within 2% and the correlation coefficient of them was about 1.0. The dual energy imaging method obtained more accurate electron density values and reduced the beam hardening artifacts obviously.Conclusion. A novel dual energy CBCT imaging method to calculate the electron densities was developed. It can acquire more accurate values and provide a platform potentially for dose calculation.

Dental cone-beam CT reconstruction from limited-angle view data based on compressed-sensing (CS) theory for fast, low-dose X-ray imaging

2014 ◽  
Vol 64 (12) ◽  
pp. 1907-1911
Author(s):  
Uikyu Je ◽  
Hyosung Cho ◽  
Minsik Lee ◽  
Jieun Oh ◽  
Yeonok Park ◽  
...  
Keyword(s):  
Compressed Sensing ◽  
Low Dose ◽  
Cone Beam Ct ◽  
Cone Beam ◽  
Ct Reconstruction ◽  
X Ray ◽  
X Ray Imaging ◽  
Limited Angle

X-ray scatter correction algorithm for cone beam CT imaging

2004 ◽  
Vol 31 (5) ◽  
pp. 1195-1202 ◽  
Author(s):  
Ruola Ning ◽  
Xiangyang Tang ◽  
David Conover
Keyword(s):  
Cone Beam Ct ◽  
Scatter Correction ◽  
Ct Imaging ◽  
Cone Beam ◽  
Correction Algorithm ◽  
X Ray

Access to Internet and Internet Shutdown: A Rights Perspective

2021 ◽  
Vol 08 (1&2) ◽  
pp. 7-14
Author(s):  
Ajay Kumar ◽  
Keyword(s):  
Human Rights ◽  
The Internet ◽  
Important Concern ◽  
The World ◽  
Current Scenario ◽  
History Of ◽  
Internet Freedom ◽  
Source Of Information ◽  
Union Territory ◽  
Different Parts

Access to the internet is fast becoming a basic right given the plethora of information available on the net these days. In the current scenario, the issue of internet shutdown has become an important concern in India. Internet shutdown affects people socially, psychologically and economically. On one hand, many democratic countries of the world are discussing about digital freedom and human rights, while on the other hand, some countries including India are continuously practicing Internet shutdowns in different parts of their countries. India has become the top country of the world in terms of the numbers of Internet shutdowns. The Internet has become such a prominent source of information for all of us that when Internet connectivity is suspended, many people are affected as they depend on the Internet services for various purposes. Internet shutdown is not only harmful to democracy and governance but also to the economy of the country. Internet shutdowns are direct violations of digital freedom and human rights. The main objective of this paper is to argue that access to internet is a basic right and highlight the problem of Internet shutdown in India and its adverse impact on the lives of Indians. In addition, this paper attempts to highlight a brief history of Internet shutdowns in India. The paper shows how frequent clampdowns on internet affects the economy, as has been the case of Union Territory of Jammu & Kashmir thereby highlighting the case for internet freedom for the survival of the economy especially in Digital India.

Video Democracies

2016 ◽  
Author(s):  
Blake Atwood
Keyword(s):  
21St Century ◽  
Digital Video ◽  
Cultural Value ◽  
Technological Changes ◽  
Video Technology ◽  
The World ◽  
Widespread Acceptance ◽  
History Of

This chapter speaks to the ways in which reform cinema was wrapped up in the technological changes during Khatami’s presidency. In particular, video technology, which was banned in Iran between 1982 and 1993, gained widespread acceptance during Khatami’s presidency. Meanwhile, the proliferation of digital video at the beginning of the 21st century was changing what it meant to make and watch movies around the world. Abbas Kiarostami’s Taste of Cherry (1997) and Ten (2002) and Bahman Farmanara’s The Smell of Camphor, the Scent of Jasmine (2001) speak to this changing technology, and they play with video in order to show how this technology was democratizing filmmaking in Iran. This chapter contextualizes Kiarostami’s and Farmanara’s films by suggesting a history of video technology in Iran, one which demonstrates that the changing cultural value of video developed in tandem with Khatami’s discourse of reform.

scholarly journals Dimensional accuracy of cone beam CT with varying angulation of the jaw to the X-ray beam

2019 ◽  
Vol 48 (4) ◽  
pp. 20180319
Author(s):  
George K. Koch ◽  
Adam Hamilton ◽  
Kelly Wang ◽  
Laura Herschdorfer ◽  
Kyu Ha Lee ◽  
...  
Keyword(s):  
Cone Beam Ct ◽  
Dimensional Accuracy ◽  
Cone Beam ◽  
X Ray

scholarly journals Patient Knowledge Regarding Radiation Exposure from Orthopaedic Foot and Ankle Imaging

2018 ◽  
Vol 3 (3) ◽  
pp. 2473011418S0015
Author(s):  
Daniel Bohl ◽  
Blaine Manning ◽  
George Holmes ◽  
Simon Lee ◽  
Johnny Lin ◽  
...  
Keyword(s):  
Ionizing Radiation ◽  
Ct Scan ◽  
Radiation Exposure ◽  
Cone Beam Ct ◽  
Plain Film ◽  
Ct Scans ◽  
Cone Beam ◽  
X Rays ◽  
Foot And Ankle ◽  
X Ray

Category: Other Introduction/Purpose: Foot and ankle surgeons routinely prescribe diagnostic imaging that exposes patients to potentially harmful ionizing radiation. The purpose of this study is to characterize patients’ knowledge regarding radiation exposure associated with common forms of foot and ankle imaging. Methods: A survey was administered to all new patients prior to their first foot and ankle clinic appointments. Patients were asked to compare the amount of harmful radiation associated with chest x-rays to that associated with various types of foot and ankle imaging. Results were tabulated and compared to actual values of radiation exposure from the published literature. Results: A total of 890 patients were invited to participate, of whom 791 (88.9%) completed the survey. The majority of patients believed that a foot x-ray, an ankle x-ray, a “low dose” CT scan of the foot and ankle (alluding to cone-beam CT), and a traditional CT scan of the foot and ankle all contain similar amounts of harmful ionizing radiation to a chest x-ray (Table 1). This is in contrast to the published literature, which suggests that foot x-rays, ankle x-rays, cone beam CT scans of the foot and ankle, and traditional CT scans of the foot and ankle expose patients to 0.006, 0.006, 0.127, and 0.833 chest x-rays worth of radiation. Conclusion: The results of the present study suggest that patients greatly over-estimate the amount of harmful ionizing radiation associated with plain film and cone-beam CT scans of the foot and ankle. Interestingly, their estimates of radiation associated with traditional CT scans of the foot and ankle were relatively accurate. Results suggest that patients may benefit from increased counseling by surgeons regarding the relatively low risk of radiation exposure associated with plain film and cone-beam CT imaging of the foot and ankle.

Covenants

2017 ◽  
Author(s):  
Gillian Kingston
Keyword(s):  
World Council Of Churches ◽  
Methodist Church ◽  
The Road ◽  
Church Of Ireland ◽  
The World ◽  
World Council ◽  
History Of ◽  
On The Road ◽  
The Church ◽  
Different Parts

This chapter explores the notion of covenant as an instrument which may facilitate closer and more binding relationships between or among churches wanting to commit to each other in a further step on the road to complete unity. The history of the term is outlined, noting its origin with the World Council of Churches. Several recent covenant relationships in different parts of the world are examined, with comments on their development and documentation. It is observed that a leading motivation in the establishment of covenants has been that of mission, while a significant challenge has been varying theologies of ministry. Particular note is taken of the covenant between the Methodist Church in Ireland and the Church of Ireland (Anglican), in which these churches are formulating legislation to facilitate interchangeability of ministries.

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