Results 31 to 40 of about 921,622 (398)

Deep learning based approach for optic disc and optic cup semantic segmentation for glaucoma analysis in retinal fundus images [PDF]

, 2020
Optic disc and optic cup are one of the most recognized retinal landmarks, and there are numerous methods for their automatic detection. Segmented optic disc and optic cup are useful in providing the contextual information about the retinal image that ...
Darko Stipaničev, Dunja Božić-Štulić, Maja Braović   +2 more
core   +2 more sources

Image quality comparisons of coil setups in 3T MRI for brain and head and neck radiotherapy simulations

Journal of Applied Clinical Medical Physics, Volume 23, Issue 12, December 2022., 2022
Abstract Purpose MRI is increasingly used for brain and head and neck radiotherapy treatment planning due to its superior soft tissue contrast. Flexible array coils can be arranged to encompass treatment immobilization devices, which do not fit in diagnostic head/neck coils. Selecting a flexible coil arrangement to replace a diagnostic coil should rely
Evangelia Kaza, Jeffrey P. Guenette, Christian V. Guthier, Steven Hatch, Alexander Marques, Lisa Singer, Jonathan D. Schoenfeld   +6 more
wiley   +1 more source

Optic Disc Abnormalities – Diagnosis, Evolution and Influence on Visual Acuity

Biomolecules & Biomedicine, 2010
Congenital abnormalities of the optic disc are not so rare. The etiology for the most of them is unknown. Visual acuity of affected eye may be minimally or severely affected, depending on the extent of lesion. All of these conditions can be unilateral or
Sonja Cekić, Gordana Stanković-Babić, Zlatica Višnjić, Ivan Jovanović, Dijana Risimić   +4 more
doaj   +1 more source

Evaluation of intrafraction couch shifts for proton treatment delivery in head‐and‐neck cancer patients: Toward optimal imaging frequency

Journal of Applied Clinical Medical Physics, Volume 23, Issue 12, December 2022., 2022
Abstract Purpose Treatment planning for head‐and‐neck (H&N) cancer, in particular oropharynx, nasopharynx, and paranasal sinus cases, at our center requires noncoplanar proton beams due to the complexity of the anatomy and target location. Targeting accuracy for all beams is carefully evaluated by using image guidance before delivering proton beam ...
Nrusingh C. Biswal, Dario B. Rodrigues, Weiguang Yao, Jason K. Molitoris, Matthew E. Witek, Shifeng Chen   +5 more
wiley   +1 more source

Progression Over 5 Years of Prelaminar Hyperreflective Lines to Optic Disc Drusen in the Copenhagen Child Cohort 2000 Eye Study.

Journal of neuro-ophthalmology, 2020
BACKGROUND The purpose of the study was to examine 5-year changes in eyes with optic disc drusen at baseline on optical coherence tomography (OCT) scans and the relation of incident drusen to hyperreflective prelaminar lines. METHODS The study included
L. Malmqvist, X. Li, M. H. Hansen, Alexander K Thomsen, A. M. Skovgaard, E. Olsen, M. Larsen, I. C. Munch, S. Hamann   +8 more
semanticscholar   +1 more source

Age effect on retina and optic disc normal values [PDF]

, 2005
Purpose: To investigate retinal thickness and optic disc parameters by the Retinal Thickness Analyzer (RTA) glaucoma program in older normal subjects and to determine any age effect.
Aljoscha S. Neubauer, Anselm Kampik, Azuara-Blanco A, Bozkurt B, Christoph Hirneiss, Christos Chryssafis, Emi K, Garway-Heath DF, Harwerth RS, Hee MR, Huang D, Ioannis Tsinopoulos, Jonas JB, Jonas JB, Jonas JB, Kerrigan-Baumrind LA, Mardin CY, Martin Thiel, Neubauer AS, Pires I, Sanchez-Tocino H, Saruhan A, Vijaya L, Zeimer R, Zeimer RC   +24 more
core   +1 more source

Volume staging for arteriovenous malformation SRS treatment using VMAT

Journal of Applied Clinical Medical Physics, Volume 23, Issue 12, December 2022., 2022
Abstract Volume staging involves dividing the target volume into smaller parts and treating each part separately. In this study, the feasibility of volume‐staged stereotactic radiosurgery (VS‐SRS) on a linear accelerator using volumetric modulated arc therapy (VMAT) and a frameless patient positioning system is investigated.
Claudia Mendez, Ermias Gete
wiley   +1 more source

Familial Disorders of the Optic Disc: Presentation of a Mother and Daughter and Review of the Literature

Case Reports in Ophthalmology, 2015
Optic disc pit and optic nerve coloboma are examples of congenital optic disc abnormalities. Although optic nerve coloboma can be inherited in an autosomal dominant fashion, no conclusive link has been found in the case of optic disc pit as an autosomal ...
Chia Lee Hsu, Christopher J. Layton
doaj   +1 more source

The relation between the thickness of retrobulbar part of the optic nerve, measured by ultrasound, and the degree of prominence of the optic disc in stasis of the optic nerve [PDF]

Srpski Arhiv za Celokupno Lekarstvo, 2006
Introduction: The etiology of the noninflamed edema of the optic disc, or the stasis of the same, is related to a large number of various illnesses which result in the increased intracranial pressure.
Stefanović Ivan, Stanojević-Paović Anka, Antunović Vaso   +2 more
doaj   +1 more source

Digital radiography image quality evaluation using various phantoms and software

Journal of Applied Clinical Medical Physics, Volume 23, Issue 12, December 2022., 2022
Abstract Purpose To investigate the effect of the exposure parameters on image quality (IQ) metrics of phantom images, obtained automatically using software or from visual evaluation. Methods Three commercial phantoms and a homemade phantom constructed according to the instructions given in the IAEA Human Health Series No.
Ioannis A. Tsalafoutas, Shady AlKhazzam, Virginia Tsapaki, Huda AlNaemi, Mohammed Hassan Kharita   +4 more
wiley   +1 more source