Handheld camera lets cancer surgeons see radioactive cells

2021 ◽  
Vol 250 (3329) ◽  
pp. 16
Author(s):  
Clare Wilson
Keyword(s):  
1996 ◽  
Author(s):  
Sarath D. Gunapala ◽  
John K. Liu ◽  
Mani Sundaram ◽  
Sumith V. Bandara ◽  
C. A. Shott ◽  
...  

BMJ Open ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. e040196
Author(s):  
Baixiang Xiao ◽  
Qinghua Liao ◽  
Yanping Li ◽  
Fan Weng ◽  
Ling Jin ◽  
...  

ObjectivesTo investigate the clinical validity of using a handheld fundus camera to detect diabetic retinopathy (DR) in China.Design and settingsProspective comparison study of the handheld fundus camera with a standard validated instrument in detection of DR in hospital and a community screening clinic in Guangdong Province, China.ParticipantsParticipants aged 18 years and over with diabetes who were able to provide informed consent and agreed to attend the dilated eye examination with handheld tests and a standard desktop camera.Primary and secondary outcome measuresPrimary outcome was the proportion of those with referable DR (R2 and above) identified by the handheld fundus camera (the index test) compared with the standard camera. Secondary outcome was the comparison of proportion of gradable images obtained from each test.ResultsIn this study, we examined 304 people (608 eyes) with each of the two cameras under mydriasis. The handheld camera detected 119 eyes (19.5%) with some level of DR, 81 (13.3%) of them were referable, while the standard camera detected 132 eyes (21.7%) with some level of DR and 83 (13.7%) were referable. It seems that the standard camera found more eyes with referable DR, although McNemar’s test detected no significant difference between the two cameras.Of the 608 eyes with images obtained by desktop camera, 598 (98.4%) images were of sufficient quality for grading, 12 (1.9%) images were not gradable. By the handheld camera, 590 (97.0%) were gradable and 20 (3.2%) images were not gradable.The two cameras reached high agreement on diagnosis of retinopathy and maculopathy at all the levels of retinopathy.ConclusionAlthough it could not take the place of standard desktop camera on clinic fundus examination, the handheld fundus camera showed promising role on preliminary DR screening at primary level in China. To ensure quality images, mydriasis is required.


Author(s):  
William L. Stefanov ◽  
Cynthia A. Evans ◽  
Susan K. Runco ◽  
M. Justin Wilkinson ◽  
Melissa D. Higgins ◽  
...  

1997 ◽  
Author(s):  
Sarath D. Gunapala ◽  
Timothy N. Krabach ◽  
Sumith V. Bandara ◽  
John K. Liu ◽  
Mani Sundaram

Author(s):  
Kristian Pandža

This paper aims, based on the method of case study, to investigate how the handheld camera affects narration and ocularization in the Dogme 95 film. The Dogme 95 (hereafter ‘Dogme’) film is a relatively recent filmmaking movement, which has its own set of strict rules – one of which requires shooting the film with a handheld camera. Regardless of the fact that the utilization of a handheld camera causes specific and recognizable image and movement aesthetics, which can be described as a specific handheld camera style, it is also an indispensable theoretical fact that it very much ‘speaks’ through narration, in particular through focalization and ocularization, which is also theoretically confirmed by theoreticians of the Dogme film. The two most representative, and most prominent films of the Dogme filmmaking movement are Idiots [Idioterne] by Lars von Trier and The Celebration [Festen] by Thomas Vinterberg. The Dogme movement, famous for its inescapable and apparent pseudo-documentary filming style – which enables one to ask the question what is here and how is the reality of reality here – raises additional questions, but also provides answers through thoroughly studying the way in which the handheld camera narrates audiovisually and how narration flows in the two aforementioned films. Additionally, it asks whether there is a difference in narration and ocularization, or if it is disabled, and how the handheld camera becomes the narrator, in symbiosis with the character. Article received: December 28, 2017; Article accepted: January 10, 2018; Published online: April 15, 2018; Original scholarly paper How to cite this article: Pandža, Kristian. "The Effect of the Handheld Camera on Narration and Ocularization in the Dogme 95 Film." AM Journal of Art and Media Studies 15 (2018): . doi: 10.25038/am.v0i15.232


Author(s):  
V. L. B. de Jesus ◽  
D. G. G. Sasaki

To perform a reliable video analysis, it is mandatory to avoid shaking the camera while taking the video, normally using a tripod for smartphones/cameras. But there are some situations which the only chance to make the video is using your hands and it is almost impossible to avoid shaking the camera even trying your best. Imagine the following situation: a volleyball is obliquely launched, and the video is filmed by hand. Then, a point that is fixed in relation to the ground is chosen as the origin of a ground fixed reference frame. Despite being a ground fixed point, it will appear shaky in images captured by the handheld camera. Thereby, two standard video analyses are performed, one from the ground fixed point random shaking and one from the ball’s trajectory, both in relation to the default reference frame of the video analysis software. Lastly, to implement the video analysis of the relative ball movement it is enough to subtract the position coordinates of the ball’s movement by the position coordinates of the ground fixed point tremble, at each instant of time. The graphs of the position and velocity components versus time are presented, and the results are discussed.


Author(s):  
William L. Stefanov ◽  
Cynthia A. Evans ◽  
Susan K. Runco ◽  
M. Justin Wilkinson ◽  
Kimberly Willis

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