28,628 results match your criteria Digital Photography


Color assessment of resin composite by using cellphone images compared with a spectrophotometer.

Restor Dent Endod 2021 May 5;46(2):e23. Epub 2021 Apr 5.

Department of Dentistry, Federal University of Sergipe, Aracaju, SE, Brazil.

Objectives: This study assessed the reliability of digital color measurements using images of resin composite specimens captured with a cellphone.

Materials And Methods: The reference color of cylindrical specimens built-up with the use of resin composite (shades A1, A2, A3, and A4) was measured with a portable spectrophotometer (CIELab). Images of the specimens were obtained individually or pairwise (compared shades in the same photograph) under standardized parameters. Read More

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Review of methods for animal videography using camera systems that automatically move to follow the animal.

Authors:
Andrew D Straw

Integr Comp Biol 2021 Jun 12. Epub 2021 Jun 12.

Institute of Biology I and Bernstein Center Freiburg, Faculty of Biology, Albert-Ludwigs-Universität Freiburg, Germany.

Digital photography and videography provide rich data for the study of animal behavior and are consequently widely used techniques. For fixed, unmoving cameras, the image sensor and optics govern the field of view and spatial detail. For a given sensor resolution, the optics determine a tradeoff between high magnification in which high spatial detail from a restricted field of view is obtained versus low magnification in which lower spatial detail is obtained from a larger region. Read More

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[Evaluation of digital technology for orthognathic surgery in 25 patients].

Shanghai Kou Qiang Yi Xue 2021 Apr;30(2):219-224

Department of Oral and Maxillofacial Surgery, Qingdao University Affiliated Hospital. Qingdao 266000, China.

Purpose: To use three-dimensional reconstruction measurement, preoperative diagnosis, surgical design, surgical simulation, guide plate production, navigation verification and effect evaluation of orthognathic surgery assisted by digital technology, in order to explore more scientific and reasonable programs and procedures of orthognathic surgery.

Methods: Twenty-five patients with congenital dental and maxillofacial deformity were selected as the experimental subjects, craniofacial spiral CT was conducted before surgery and CT data were imported into Mimics 20.0 software to establish a 3D head digital model. Read More

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Retinal imaging in Alzheimer's disease.

J Neurol Neurosurg Psychiatry 2021 Jun 9. Epub 2021 Jun 9.

Singapore Eye Research Institute, Singapore National Eye Centre, Singapore.

Identifying biomarkers of Alzheimer's disease (AD) will accelerate the understanding of its pathophysiology, facilitate screening and risk stratification, and aid in developing new therapies. Developments in non-invasive retinal imaging technologies, including optical coherence tomography (OCT), OCT angiography and digital retinal photography, have provided a means to study neuronal and vascular structures in the retina in people with AD. Both qualitative and quantitative measurements from these retinal imaging technologies (eg, thinning of peripapillary retinal nerve fibre layer, inner retinal layer, and choroidal layer, reduced capillary density, abnormal vasodilatory response) have been shown to be associated with cognitive function impairment and risk of AD. Read More

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Relationship of the cornea and globe dimensions to the changes in adult human crystalline lens diameter, thickness and power with age.

Exp Eye Res 2021 Jun 5;209:108653. Epub 2021 Jun 5.

Brien Holden Vision Institute Limited, Sydney, Australia; School of Optometry and Vision Science, The University of New South Wales, Sydney, NSW, Australia; Ophthalmic Biophysics Center, Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, Miami, FL, USA.

It is well known that human crystalline lens shape, dimensions and optical properties change throughout life and influence whole eye refraction. However, it is not clear if lens properties are associated with other ocular parameters. The purpose of the present study was to investigate the relationship of corneal and external globe dimensions with adult lens diameter (LD), lens thickness (LT) and lens power (LP) in order to determine if external factors influence lens properties. Read More

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Foam surfaces for preventing pressure ulcers.

Cochrane Database Syst Rev 2021 05 6;5:CD013621. Epub 2021 May 6.

Nursing Research Institute, St Vincent's Health Australia Sydney, St Vincent's Hospital Melbourne & Australian Catholic University, Fitzroy, Melbourne, Australia.

Background: Pressure ulcers (also known as pressure injuries) are localised injuries to the skin or underlying soft tissue, or both, caused by unrelieved pressure, shear or friction. Foam surfaces (beds, mattresses or overlays) are widely used with the aim of preventing pressure ulcers.

Objectives: To assess the effects of foam beds, mattresses or overlays compared with any support surface on the incidence of pressure ulcers in any population in any setting. Read More

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Alternative reactive support surfaces (non-foam and non-air-filled) for preventing pressure ulcers.

Cochrane Database Syst Rev 2021 05 6;5:CD013623. Epub 2021 May 6.

Nursing Research Institute, St Vincent's Health Australia Sydney, St Vincent's Hospital Melbourne & Australian Catholic University, Fitzroy, Melbourne, Australia.

Background: Pressure ulcers (also known as injuries, pressure sores, decubitus ulcers and bed sores) are localised injuries to the skin or underlying soft tissue, or both, caused by unrelieved pressure, shear or friction. Reactive surfaces that are not made of foam or air cells can be used for preventing pressure ulcers.

Objectives: To assess the effects of non-foam and non-air-filled reactive beds, mattresses or overlays compared with any other support surface on the incidence of pressure ulcers in any population in any setting. Read More

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Variations of bronchial artery origin in 600 patients: Systematic analysis with multidetector computed tomography and digital subtraction angiography.

Medicine (Baltimore) 2021 Jun;100(22):e26001

Department of Radiology, Seoul National University Bundang Hospital, Seongnam-si, Gyeonggi-do.

Abstract: To identify and evaluate the spectrum and prevalence of variations in bronchial artery (BA) origin by multidetector computed tomography (MDCT) and digital subtraction angiography (DSA) in a large population with hemoptysis.From July 2008 to June 2015, data from 600 individuals with hemoptysis who underwent MDCT and DSA were retrospectively analyzed. The pattern of BA origin was investigated and classified according to distribution. Read More

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The visual vernacular: embracing photographs in research.

Perspect Med Educ 2021 Jun 2. Epub 2021 Jun 2.

Division of Medical Education, Dalhousie University, Halifax, NS, Canada.

The increasing use of digital images for communication and interaction in everyday life can give a new lease of life to photographs in research. In contexts where smartphones are ubiquitous and many people are "digital natives", asking participants to share and engage with photographs aligns with their everyday activities and norms more than textual or analogue approaches to data collection. Thus, it is time to consider fully the opportunities afforded by digital images and photographs for research purposes. Read More

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Bacteria Single-Cell and Photosensitizer Interaction Revealed by Quantitative Phase Imaging.

Int J Mol Sci 2021 May 11;22(10). Epub 2021 May 11.

Department of Biomedical Engineering, Faculty of Fundamental Problems of Technology, Wrocław University of Science and Technology, 27 Wybrzeże S. Wyspiańskiego St., 50-370 Wrocław, Poland.

Quantifying changes in bacteria cells in the presence of antibacterial treatment is one of the main challenges facing contemporary medicine; it is a challenge that is relevant for tackling issues pertaining to bacterial biofilm formation that substantially decreases susceptibility to biocidal agents. Three-dimensional label-free imaging and quantitative analysis of bacteria-photosensitizer interactions, crucial for antimicrobial photodynamic therapy, is still limited due to the use of conventional imaging techniques. We present a new method for investigating the alterations in living cells and quantitatively analyzing the process of bacteria photodynamic inactivation. Read More

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Four-Flap Mammaplasty.

Aesthetic Plast Surg 2021 May 26. Epub 2021 May 26.

Cerrahpasa - Cerrahpasa Medical Faculty, Department of Plastic, Reconstructive and Aesthetic Surgery, Istanbul University, Istanbul, Fatih, Turkey.

Background: Any kind of breast shaping aims certain endpoints, and results are expected to be durable. We present a breast shaping technique with an anatomical basis, reproducible and long-lasting results.

Methods: A total of 700 patients have been operated on with this technique. Read More

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Iterative tomography with digital adaptive optics permits hour-long intravital observation of 3D subcellular dynamics at millisecond scale.

Cell 2021 Jun 25;184(12):3318-3332.e17. Epub 2021 May 25.

Department of Automation, Tsinghua University, Beijing 100084, China; Institute for Brain and Cognitive Sciences, Tsinghua University, Beijing 100084, China; Beijing Key Laboratory of Multi-dimension & Multi-scale Computational Photography (MMCP), Tsinghua University, Beijing 100084, China; IDG/McGovern Institute for Brain Research, Tsinghua University, Beijing 100084, China. Electronic address:

Long-term subcellular intravital imaging in mammals is vital to study diverse intercellular behaviors and organelle functions during native physiological processes. However, optical heterogeneity, tissue opacity, and phototoxicity pose great challenges. Here, we propose a computational imaging framework, termed digital adaptive optics scanning light-field mutual iterative tomography (DAOSLIMIT), featuring high-speed, high-resolution 3D imaging, tiled wavefront correction, and low phototoxicity with a compact system. Read More

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Digital media archive for gross pathology images based on open-source tools and Fast Healthcare Interoperability Resources (FHIR).

Mod Pathol 2021 May 25. Epub 2021 May 25.

Department of Pathology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA.

Macroscopic examination of surgical pathology and autopsy cases is a fundamental component of anatomic pathology. The photographic documentation of such clinical specimens is essential, and it may be required in certain instances. Our department began using consumer-grade digital cameras in 2005 to improve the practice of gross photography. Read More

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Cerebral venous sinus thrombosis and aneurysm in a patient with double heterozygous beta-thalassemia major: A case report.

Medicine (Baltimore) 2021 May;100(21):e26082

Department of Neurology, The Third People's Hospital of Chengdu, The Affiliated Hospital of Southwest Jiaotong University, Chengdu, Sichuan Province, China.

Rationale: Thalassemia is an inherited disease associated with thromboembolic events (TEE) and cerebral artery disease. Here, we report a patient with beta-thalassemia presenting with intracerebral hemorrhage due to cerebral venous sinus thrombosis (CVST), and intracranial aneurysms were found after examination. We believe that it is very rare for this patient to have two kinds of cerebrovascular diseases. Read More

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Free-floating and spinning thrombus of the basilar artery: A case report.

Medicine (Baltimore) 2021 May;100(21):e25696

Department of Neurology, Korea University Ansan Hospital, Korea University College of Medicine, Ansan, Republic of Korea.

Rationale: Free-floating thrombi in the intracranial artery are rare. We report a case of a free-floating and spinning thrombus caused by turbulent flow distal to the basilar artery stenosis. We compare thrombus changes in a series of images according to time and describe the approach to treatment and thrombosis resolution. Read More

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Three-Dimensional Nasolabial Changes After Nasoalveolar Molding and Primary Lip/Nose Surgery in Infants With Bilateral Cleft Lip and Palate.

Cleft Palate Craniofac J 2021 May 25:10556656211012858. Epub 2021 May 25.

Hansjorg Wyss Department of Plastic Surgery, 12297New York University Langone Health, New York, NY, USA.

Objective: Utilize 3-dimensional (3D) photography to evaluate the nasolabial changes in infants with bilateral cleft lip and palate (BCLP) who underwent nasoalveolar molding (NAM) and primary reconstructive surgery.

Design: This is a retrospective serial longitudinal study of consecutively enrolled infants from September 2012 to July 2016 with BCLP who underwent NAM before primary lip and nose reconstructive surgery. It included infants who had digital 3dMD stereophotogrammetry records at initial presentation (T1), completion of NAM (T2), and 3 weeks following primary repair (T3). Read More

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Congenital renal arteriovenous malformation with cirsoid and cavernosal-type characteristics: a case report.

J Int Med Res 2021 May;49(5):3000605211016381

Department of Urology, Affiliated Hangzhou First People's Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang, China.

Renal arteriovenous malformations (AVMs) are infrequent vascular morphological anomalies. About 20% of AVMs are congenital renal AVMs (CRAVMs). A 53-year-old female patient presented with a 5-day history of gross hematuria and right flank pain. Read More

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Safe clinical photography: best practice guidelines for risk management and mitigation.

Arch Plast Surg 2021 May 15;48(3):295-304. Epub 2021 May 15.

College of Nursing, University of Iowa, Iowa City, IA, USA.

Clinical photography is an essential component of patient care in plastic surgery. The use of unsecured smartphone cameras, digital cameras, social media, instant messaging, and commercially available cloud-based storage devices threatens patients' data safety. This paper Identifies potential risks of clinical photography and heightens awareness of safe clinical photography. Read More

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Traumatic dissecting pathology of posterior cerebral artery: a report of two cases-aneurysm and pial arteriovenous fistula.

BMJ Case Rep 2021 May 20;14(5). Epub 2021 May 20.

Radiology, Sanjay Gandhi Post Graduate Institute of Medical Sciences, Lucknow, Uttar Pradesh, India.

We present two cases of 17-year-old man and 10-year-old boy presenting with subarachnoid haemorrhage and a history of road traffic accident. One patient had dissecting aneurysm of the posterior cerebral artery (PCA), and the other patient had partially thrombosed aneurysm on CT angiography. On digital subtraction angiography of the second patient, there was formation of PCA pontomesencephalic vein pial arteriovenous fistula (PAVF). Read More

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Evaluation of microcalcification contrast in clinical images for digital mammography and synthetic mammography.

Eur J Radiol 2021 Jul 6;140:109751. Epub 2021 May 6.

Dept of Physics and Earth Sciences, University of Ferrara, via Saragat 1, 44122 Ferrara, Italy.

Purpose: The aim of this work was to compare, in a clinical study, digital mammography and synthetic mammography imaging by evaluating the contrast in microcalcifications of different sizes.

Methods: A retrospective review of microcalcifications from 46 patients was undertaken. A Hologic 3-Dimensions mammography system and a HD Combo protocol was used for simultaneous acquisition of the digital and synthetic images. Read More

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Reactive air surfaces for preventing pressure ulcers.

Cochrane Database Syst Rev 2021 05 7;5:CD013622. Epub 2021 May 7.

Nursing Research Institute, St Vincent's Health Australia Sydney, St Vincent's Hospital Melbourne & Australian Catholic University, Fitzroy, Melbourne, Australia.

Background: Pressure ulcers (also known as pressure injuries, pressure sores, decubitus ulcers and bed sores) are localised injuries to the skin or underlying soft tissue, or both, caused by unrelieved pressure, shear or friction. Reactive air surfaces (beds, mattresses or overlays) can be used for preventing pressure ulcers.

Objectives: To assess the effects of reactive air beds, mattresses or overlays compared with any support surface on the incidence of pressure ulcers in any population in any setting. Read More

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Smartphone application for wound area measurement in clinical practice.

J Vasc Surg Cases Innov Tech 2021 Jun 26;7(2):258-261. Epub 2021 Feb 26.

Division of Vascular Surgery, Hospital do Servidor Público Estadual, São Paulo, SP, Brazil.

A total of 85 consecutive patients had their wound area measured. The procedure was executed in two parts. The first was to take photographs of the wound using a smartphone and measure the area using the imitoMeasure application (imito; imito AG, Zurich, Switzerland) by two raters. Read More

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Intraprocedural cone-beam CT with parenchymal blood volume assessment for transarterial chemoembolization guidance: Impact on the effectiveness of the individual TACE sessions compared to DSA guidance alone.

Eur J Radiol 2021 Jul 8;140:109768. Epub 2021 May 8.

Department of Diagnostic and Interventional Radiology, Eberhard Karls University, Hoppe-Seyler-Strasse 3, 72076, Tübingen, Germany. Electronic address:

Purpose: The objective of this retrospective single centre study was to evaluate the impact of intraprocedural cone-beam CT with parenchymal blood volume assessment (PBV-CBCT) for guidance of transarterial chemoembolization with drug-eluting beads (DEB-TACE) in HCC patients on the effectiveness (local tumour response, survival and number of individual TACE sessions) compared to guidance solely by digital subtraction angiography (DSA).

Method: n = 179 HCC patients (mean age, 77.4 y) undergoing DEB-TACE, with (n = 28) and without (n = 151) PBV-CBCT, using 100-300 μm microspheres loaded with epirubicin were retrospectively analysed. Read More

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Digital holographic deep learning of red blood cells for field-portable, rapid COVID-19 screening.

Opt Lett 2021 May;46(10):2344-2347

Rapid screening of red blood cells for active infection of COVID-19 is presented using a compact and field-portable, 3D-printed shearing digital holographic microscope. Video holograms of thin blood smears are recorded, individual red blood cells are segmented for feature extraction, then a bi-directional long short-term memory network is used to classify between healthy and COVID positive red blood cells based on their spatiotemporal behavior. Individuals are then classified based on the simple majority of their cells' classifications. Read More

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Recently updated global diabetic retinopathy screening guidelines: commonalities, differences, and future possibilities.

Eye (Lond) 2021 May 11. Epub 2021 May 11.

Department of Research, Ophthalmic epidemiology & Low Vision, King Khalid Eye Hospital, Riyadh, Kingdom of Saudi Arabia.

Diabetic retinopathy (DR) is a global health burden. Screening for sight-threatening DR (STDR) is the first cost-effective step to decrease this burden. We analyzed the similarities and variations between the recent country-specific and the International Council of Ophthalmology (ICO) DR guideline to identify gaps and suggest possible solutions for future universal screening. Read More

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Direct patient-to-physician teledermatology: Not a flash in the pan(demic).

Clin Dermatol 2021 Jan-Feb;39(1):45-51. Epub 2020 Dec 24.

Department of Dermatology and Venereology, Medical Faculty, Medical University, Sofia, Bulgaria.

Dermatology is a clinical and visual discipline, which makes it the quintessential medical specialty for spot diagnosis and telemedicine. The COVID-19 pandemic has led to an unprecedented worldwide renaissance of teledermatology (TD). It has helped deliver high-quality medical care, while protecting the medical personnel and vulnerable patients from potential infection. Read More

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A 2D Photographic and 3D Digital Dental Model Analysis of Golden Percentage in Maxillary Anterior Teeth.

Biomed Res Int 2021 17;2021:6674400. Epub 2021 Apr 17.

Department of Preventive Dentistry, College of Dentistry, Jouf University, Sakaka, Al Jouf 72345, Saudi Arabia.

The objective of this paper was to evaluate the existence of golden percentage in natural maxillary anterior teeth with the aid of 3D digital dental models and 2D photographs. And to propose regional values of golden percentage for restoration of maxillary anterior teeth. For this purpose, one hundred and ninety dentate subjects with sound maxillary anterior teeth were selected. Read More

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Aerial survey estimates of polar bears and their tracks in the Chukchi Sea.

PLoS One 2021 6;16(5):e0251130. Epub 2021 May 6.

Alaska Fisheries Science Center, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, Seattle, Washington, United States of America.

Polar bears are of international conservation concern due to climate change but are difficult to study because of low densities and an expansive, circumpolar distribution. In a collaborative U.S. Read More

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Meal-time Smartphone Use in an Obesogenic Environment: Two Longitudinal Observational Studies.

JMIR Mhealth Uhealth 2021 05 6;9(5):e22929. Epub 2021 May 6.

Division of Social Sciences, Yale-National University of Singapore College, Singapore, Singapore.

Background: Despite a large volume of research on the impact of other digital screens (eg, televisions) on eating behavior, little is known about the nature and impact of mealtime smartphone use.

Objective: We investigated how smartphones are used in everyday meals, whether phone users differ according to mealtime phone use patterns, and whether specific phone functions (particularly food photography) would affect the amount and enjoyment of food eaten.

Methods: Across 2 studies, we used the experience sampling method to track 1780 meals in situ. Read More

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