29,839 results match your criteria Digital Photography


Bridge Crack Inspection Efficiency of an Unmanned Aerial Vehicle System with a Laser Ranging Module.

Sensors (Basel) 2022 Jun 13;22(12). Epub 2022 Jun 13.

Department of Land Management, Feng Chia University, Taichung 407301, Taiwan.

In this study, an unmanned aerial vehicle (UAV) with a camera and laser ranging module was developed to inspect bridge cracks. Four laser ranging units were installed adjacent to the camera to measure the distance from the camera to the object to calculate the object's projection plane and overcome the limitation of vertical photography. The image processing method was adopted to extract crack information and calculate crack sizes. Read More

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Optics and Utility of Low-Cost Smartphone-Based Portable Digital Fundus Camera System for Screening of Retinal Diseases.

Diagnostics (Basel) 2022 Jun 20;12(6). Epub 2022 Jun 20.

Department of Ophthalmology, Loma Linda University School of Medicine, Loma Linda, CA 92354, USA.

Purpose: To describe optical principles and utility of inexpensive, portable, non-contact digital smartphone-based camera for the acquisition of fundus photographs for the evaluation of retinal disorders.

Methods: The digital camera has a high-quality glass 25 D condensing lens attached to a 21.4-megapixel smartphone camera. Read More

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Comparison of the clinical value of transcranial Doppler ultrasound and computed tomography angiography for diagnosing ischemic cerebrovascular disease.

J Int Med Res 2022 Jun;50(6):3000605211047718

Department of Diagnostic Ultrasound, Second Affiliated Hospital of Dalian Medical University, Dalian, Liaoning, China.

Objective: To compare the clinical value of transcranial Doppler (TCD) ultrasound and computed tomography angiography (CTA) for diagnosing ischemic cerebrovascular disease.

Methods: A retrospective clinical study was conducted in 142 patients with ischemic cerebrovascular disease who were initially diagnosed by digital subtraction angiography. Under the single-blind condition, the patients were diagnosed by using TCD ultrasound and CTA independently. Read More

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Deep Learning-Based Magnetic Resonance Imaging in Diagnosis and Treatment of Intracranial Aneurysm.

Comput Math Methods Med 2022 13;2022:1683475. Epub 2022 Jun 13.

Clinical Medical College of Panzhihua University, Panzhihua, 617000 Sichuan, China.

This study was focused on the positioning of the intracranial aneurysm in the magnetic resonance imaging (MRI) images using the deep learning-based U-Net model, to realize the computer-aided diagnosis of the intracranial aneurysm. First, a network was established based on the three-dimensional (3D) U-Net model, and the collected image data were input into the network to realize the automatic location and segmentation of the aneurysm. The 3D convolutional neural network (CNN) network can extract the aneurysm blood vessels to locate and identify the areas of possible aneurysms. Read More

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A Pilot Study to Assess the Reliability of Digital Image-Based PASI Scores Across Patient Skin Tones and Provider Training Levels.

Dermatol Ther (Heidelb) 2022 Jun 21. Epub 2022 Jun 21.

Department of Dermatology, University of California, 2340 Sutter Street, Box 0808, San Francisco, CA, 94143, USA.

Introduction: The ability to perform psoriasis skin assessments remotely through digital image-based psoriasis area and severity index (DIB-PASI) would be a valuable tool for psoriasis clinical trials. An ideal teledermatological assessment would be robust across patients of diverse skin tones as well as across assessors of varying experience levels. In this pilot study, we evaluated the reliability of face-to-face (FTF) versus DIB-PASI scores determined by trained clinical assessors with a spectrum of experience and with patients of different skin tones. Read More

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Multimedia Tilt Photography-Assisted Remote Sensing Technology in Mine Ecological Restoration.

Comput Intell Neurosci 2022 10;2022:1442738. Epub 2022 Jun 10.

Lijiahao Coal Mine, National Energy Baotou Energy Co., Ltd, Ordos, Inner Mongolia Autonomous Region 017000, China.

Ecological restoration with the assistance of certain artificial measures is to restore the original ecological function and productivity of the ecosystem or to make the ecosystem develop to a virtuous circle, which is a complex systematic project. Based on this, combined with the actual needs of a mine ecological restoration project, this paper puts forward the technical process and method of quickly acquiring the geographic information of abandoned mines by using the oblique photography technology of unmanned aerial vehicles. The verification results show that the maximum plane/elevation residual error of the checkpoints measured in the field is 0. Read More

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Simple and automatic monitoring of cancer cell invasion into an epithelial monolayer using label-free holographic microscopy.

Sci Rep 2022 Jun 16;12(1):10111. Epub 2022 Jun 16.

Nanobiosensorics Laboratory, Institute of Technical Physics and Materials Science, Centre for Energy Research, Budapest, Hungary.

The invasiveness of cancer cells describes the metastasizing capability of a primary tumor. The straightforward detection and quantification of cancer cell invasion are important to predict the survival rate of a cancer patient and to test how anti-cancer compounds influence cancer progression. Digital holographic microscopy based M4 Holomonitor (HM) is a technique that allows the label-free monitoring of cell morphological and kinetical parameters in real-time. Read More

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Modern Diagnostic Imaging Technique Applications and Risk Factors in the Medical Field: A Review.

Biomed Res Int 2022 6;2022:5164970. Epub 2022 Jun 6.

Department of Pharmacy, Faculty of Medical Sciences, Aljanad University for Science and Technology, Taiz, Yemen.

Medical imaging is the process of visual representation of different tissues and organs of the human body to monitor the normal and abnormal anatomy and physiology of the body. There are many medical imaging techniques used for this purpose such as X-ray, computed tomography (CT), positron emission tomography (PET), magnetic resonance imaging (MRI), single-photon emission computed tomography (SPECT), digital mammography, and diagnostic sonography. These advanced medical imaging techniques have many applications in the diagnosis of myocardial diseases, cancer of different tissues, neurological disorders, congenital heart disease, abdominal illnesses, complex bone fractures, and other serious medical conditions. Read More

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A case study in citizen environmental humanities: creating a participatory plant story website.

J Environ Stud Sci 2022 10;12(2):327-340. Epub 2022 Feb 10.

Department of Thematic Studies, Unit of Gender Studies, Linköping University, Linköping, Sweden.

Public engagement in crowd-sourced science projects such as iNaturalist or the Audubon Christmas Bird Count is a long-established practice within environmental studies and sciences. As a corollary to these "citizen science" efforts, "citizen humanities" engages public participation in humanities research and/or with humanities tools such as creative writing, photography, art-making, or conducting and recording interviews. In this essay, we outline our work creating a citizen environmental humanities website, , including our motivations, process, and theoretical underpinnings. Read More

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February 2022

Development of a Digital Photographic Food Atlas as a Portion Size Estimation Aid in Japan.

Nutrients 2022 May 26;14(11). Epub 2022 May 26.

Department of Social and Preventive Epidemiology, School of Public Health, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.

This study aimed to develop a digital photographic food atlas as a portion size estimation aid. Commonly consumed foods were identified from the 5512-day weighed dietary records of 644 Japanese adults. Portion sizes were determined based on the market research and distribution of food consumption in the dietary records. Read More

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Corrosion Cast and 3D Reconstruction of the Murine Biliary Tree After Biliary Obstruction: Quantitative Assessment and Comparison With 2D Histology.

J Clin Exp Hepatol 2022 May-Jun;12(3):755-766. Epub 2021 Dec 20.

Department of General, Visceral and Vascular Surgery, Experimental Transplantation Surgery, University Hospital Jena, Drackendorfer Strasse 1, 07747, Jena, Germany.

Background: Obstructive cholestasis can lead to significant alterations of the biliary tree depending on the extent and duration of the biliary occlusion. Current experimental studies reported about advanced techniques for corrosion cast and 3D reconstruction (3D-reco) visualizing delicate microvascular structures in animals. We compared these two different techniques for visualization and quantitative assessment of the obstructed murine biliary tree with classical 2D histology. Read More

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December 2021

Efficacy of smartphone-based retinal photography by undergraduate students in screening and early diagnosing diabetic retinopathy.

Int J Retina Vitreous 2022 Jun 7;8(1):35. Epub 2022 Jun 7.

Division of Ophthalmology, Ribeirão Preto Medical School, University of São Paulo, 3900, Bandeirantes Ave, Ribeirão Preto, SP, 14049-900, Brazil.

Background: To evaluate the efficacy of retinal photography obtained by undergraduate students using a smartphone-based device in screening and early diagnosing diabetic retinopathy (DR).

Methods: We carried out an open prospective study with ninety-nine diabetic patients (194 eyes), who were submitted to an ophthalmological examination in which undergraduate students registered images of the fundus using a smartphone-based device. At the same occasion, an experienced nurse captured fundus photographs from the same patients using a gold standard tabletop camera system (Canon CR-2 Digital Non-Mydriatic Retinal Camera), with a 45º field of view. Read More

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Differential Subsampling with Cartesian Ordering-MRA for Classifying Residual Treated Aneurysms.

AJNR Am J Neuroradiol 2022 06;43(6):887-892

From the Department of Radiological Sciences (P.S., A.C., K.N.), University of California Los Angeles, Los Angeles, California

Background And Purpose: Differential Subsampling with Cartesian Ordering (DISCO), an ultrafast high-spatial-resolution head MRA, has been introduced. We aimed to determine the diagnostic performance of DISCO-MRA in grading residual aneurysm in comparison with TOF-MRA in patients with treated intracranial aneurysms.

Materials And Methods: Patients with endovascular treatment and having undergone DISCO-MRA, TOF-MRA, and DSA were included for review. Read More

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Nonlinear micro finite element models based on digital volume correlation measurements predict early microdamage in newly formed bone.

J Mech Behav Biomed Mater 2022 Aug 1;132:105303. Epub 2022 Jun 1.

School of Engineering and Physical Sciences, Institute of Mechanical, Process and Energy Engineering, Heriot-Watt University, EH14 4AS, UK. Electronic address:

Bone regeneration in critical-sized defects is a clinical challenge, with biomaterials under constant development aiming at enhancing the natural bone healing process. The delivery of bone morphogenetic proteins (BMPs) in appropriate carriers represents a promising strategy for bone defect treatment but optimisation of the spatial-temporal release is still needed for the regeneration of bone with biological, structural, and mechanical properties comparable to the native tissue. Nonlinear micro finite element (μFE) models can address some of these challenges by providing a tool able to predict the biomechanical strength and microdamage onset in newly formed bone when subjected to physiological or supraphysiological loads. Read More

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Accuracy assessment of UAV-post-processing kinematic (PPK) and UAV-traditional (with ground control points) georeferencing methods.

Environ Monit Assess 2022 Jun 4;194(7):476. Epub 2022 Jun 4.

Department of Geomatic Engineering, Civil Engineering Faculty, Yildiz Technical University, 34220, Davutpasa, Istanbul, Türkiye.

The use of unmanned aerial vehicles (UAV) in photogrammetric mapping/surveying facilities has increased recently due to the developments on photogrammetric instruments and algorithms that enhance high-quality final products (orthoimages, digital surface model-DSM, etc.) in fast, accurate, and economical way. The aim of this study was to assess the accuracy of a UAV-based post-processing kinematic (PPK) solution. Read More

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[Role of CT and MRI image fusion and computer assisted simulation technique in guiding type Ⅲ and Ⅳ primary pelvic sarcoma surgeries].

Zhonghua Wai Ke Za Zhi 2022 Jun;60(6):567-572

Department of Bone and Soft Tissue,Zhenghzhou University Affiliated Cancer Hospital,Henan Cancer Hospital,Key Laboratory for Digital Assessment of Spinal-pelvic Tumor and Surgical Aid Tools Design (Zhengzhou),Key Laboratory for Perioperative Digital Assessment of Bone Tumors (Henan),Zhengzhou 450003, China.

To explore the possible clinical benefits of CT/MRI image fusion and computer-assisted simulation techniques in guiding type Ⅲ and Ⅳ primary pelvic bone tumor surgeries. The clinic data of primary bone sarcomas patients treated at Department of Bone and Soft Tissue,Zhenghzhou University Affiliated Cancer Hospital from January 2019 to December 2021 were retrospectively analyzed. Based on whether the CT and MRI image fusion technique was utilized for tumor evaluation and surgical planning,the patients were divided into image fusion group (=21) or control group (=27). Read More

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[Clinical study of digital six-axis external fixation frame based on CT data for tibiofibular fractures].

Zhonghua Wai Ke Za Zhi 2022 Jun;60(6):552-557

Integrated Orthopedic Department of Traditional Chinese Medicine (TCM) and Western Medicine,HongHui Hospital, Xi'an Jiaotong University, Xi'an 710054, China.

To investigate the clinical effect of applying the digital six-axis external fixation frame based on CT data in the treatment of tibiofibular fractures. The clinical data of 43 patients with tibiofibular fractures treated by the self-developed digital six-axis external fixation frame based on CT data at Integrated Orthopedic Department of Traditional Chinese Medicine (TCM) and Western Medicine,HongHui Hospital from January 2018 to January 2021 were retrospective analysis.There were 27 males and 16 females,aged (36. Read More

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Iodinated Contrast Material Shortage: Perspectives from the Cancer Imaging Community.

Authors:
Gary D Luker

Radiol Imaging Cancer 2022 Jun;4(4):e220077

University of Michigan Ringgold standard institution - Radiology 109 Zina Pitcher Place A524 BSRB, Ann Arbor, Michigan 48109-2200 United States.

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3D Printing of Subclavian Artery: Utility for Preprocedural Planning and Correlation With Subclavian Artery Percutaneous Vascular Interventions.

J Invasive Cardiol 2022 Jun;34(6):E455-E461

Pennsylvania Hospital, University of Pennsylvania Health System, Philadelphia, PA 19130 USA.

Background: Three-dimensional (3D) printing for subclavian artery (SA) percutaneous vascular interventions (PVI) may allow superior understanding of patient specific complex anatomy and aid with preprocedural planning.

Methods: Five patients with computed tomography angiography (CTA) of the neck who underwent SA PVI were queried retrospectively. 3D printing of aortic arch and great vessels was accomplished with 3D slicer software and painted with acrylic paint to highlight anatomic features. Read More

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Holographic point source for digital lensless holographic microscopy.

Opt Lett 2022 Jun;47(11):2862-2865

A holographic point source (HPS) developed for digital lensless holographic microscopy (HPS-DLHM) is presented. The HPS is an off-axis phase transmission hologram of an experimental micrometer pinhole recorded on a photopolymer holographic film. An amplitude division interferometer, adjusted to operate at maximum diffraction efficiency, has been employed to record the hologram. Read More

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Transformation of coherence-dependent bokeh for incoherent digital holography.

Opt Lett 2022 Jun;47(11):2774-2777

Incoherent digital holography (IDH) enables the recording of holograms with incoherent light. However, there is unnatural bokeh with ringing on reconstructed 2D images, owing to the diffraction calculation based on the coherent nature of the light. Thus, we propose a transformation method that converts it into incoherent bokeh. Read More

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Light-field focusing and modulation through scattering media based on dual-polarization-encoded digital optical phase conjugation.

Opt Lett 2022 Jun;47(11):2738-2741

Digital optical phase conjugation (DOPC) can be applied for light-field focusing and imaging through or within scattering media. Traditional DOPC only recovers the phase but loses the polarization information of the original incident beam. In this Letter, we propose a dual-polarization-encoded DOPC to recover the full information (both phase and polarization) of the incident beam. Read More

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Diagnostic Accuracy of Chest Digital Tomosynthesis in Patients Recovering after COVID-19 Pneumonia.

Tomography 2022 04 24;8(3):1221-1227. Epub 2022 Apr 24.

Department of Radiology, Cattinara Hospital, University of Trieste, 34127 Trieste, Italy.

Purpose: To assess the diagnostic accuracy of traditional chest X-ray (CXR) and digital tomosynthesis (DTS) compared to computed tomography (CT) in detecting pulmonary interstitial changes in patients having recovered from severe COVID-19.

Materials And Methods: This was a retrospective observational study, and received local ethics committee approval. Patients suspected of having COVID-19 pneumonia upon emergency department admission between 1 March and 31 August 2020, and who underwent CXR followed by DTS and CT, were considered. Read More

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[Hematoma Segmentation of Spontaneous Intracerebral Hemorrhage Based on Watershed and Region-Growing Algorithm].

Sichuan Da Xue Xue Bao Yi Xue Ban 2022 May;53(3):511-516

West China-PUMC C.C.Chen Institute of Health, West China School of Public Health and West China Fourth Hospital, Sichuan University, Chengdu 610041, China.

Objective: To establish a brain hematoma CT image segmentation method based on watershed and region-growing algorithm so as to measure hematoma volume quickly and accurately, to explore the consistency between the results of this segmentation method and those of manual segmentation, the clinical gold standard, and to compare the results of this method with the calculation of the two Tada formulas commonly used in clinical practice.

Methods: The preoperative CT images of 152 patients who were treated for spontaneous cerebral hemorrhage at the Department of Neurosurgery, West China Hospital, Sichuan University between January 2018 and June 2019 were retrospectively collected. The CT images were randomly assigned, by using a random number table, to the training set, the test set and the validation set, which contained 100 patients, 22 patients and 30 patients, respectively. Read More

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Detection Rate of Ga-PSMA PET/CT . mpMRI Targeted Biopsy for Clinically Significant Prostate Cancer.

Anticancer Res 2022 Jun;42(6):3011-3015

Pathology Unit, Cannizzaro Hospital, Catania, Italy.

Background/aim: To evaluate the diagnostic accuracy of Ga-prostate-specific membrane antigen (PSMA) positron emission tomography/computed tomography (PET/CT) vs. multiparametric magnetic resonance imaging (mpMRI) targeted biopsy (TPBx) in the diagnosis of clinically significant prostate cancer (csPCa: Grade Group ≥2).

Patients And Methods: From January 2021 to January 2022, 45 patients (median age: 67 years) with negative digital rectal examination underwent transperineal prostate biopsy for abnormal PSA values (median 7. Read More

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Single-Shot 3D Topography of Transmissive and Reflective Samples with a Dual-Mode Telecentric-Based Digital Holographic Microscope.

Sensors (Basel) 2022 May 17;22(10). Epub 2022 May 17.

Material Science Laboratory, Integrated Microscopy Center, The University of Memphis, Memphis, TN 38152, USA.

Common path DHM systems are the most robust DHM systems as they are based on self-interference and are thus less prone to external fluctuations. A common issue amongst these DHM systems is that the two replicas of the sample's information overlay due to self-interference, making them only suitable for imaging sparse samples. This overlay has restricted the use of common-path DHM systems in material science. Read More

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Prevalence of diabetic retinopathy and self-reported barriers to eye care among patients with diabetes in the emergency department: the diabetic retinopathy screening in the emergency department (DRS-ED) study.

BMC Ophthalmol 2022 May 27;22(1):237. Epub 2022 May 27.

Department of Ophthalmology, University of Pittsburgh Medical Center, 203 Lothrop Street, 8th floor, Pittsburgh, PA, 15213, USA.

Background: Screening for diabetic retinopathy (DR) is suboptimal, and patients with diabetes who present to the emergency department (ED) may be at particularly high risk of undiagnosed DR. The purpose of this study is to determine the prevalence of DR among diabetic patients who present to the ED of our tertiary medical center using teleophthalmology and to assess self-reported barriers to eye care.

Methods: This cross-sectional, single-institution study recruited clinically stable diabetic patients who presented to the ED during daytime hours over 29 total weekdays across 2 months in 2018 and 2019. Read More

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The progress in quantitative evaluation of callus during distraction osteogenesis.

BMC Musculoskelet Disord 2022 May 24;23(1):490. Epub 2022 May 24.

Department of Orthopaedics, Xiangya Hospital, Central South University, Hunan Province, Changsha, 410008, China.

The manual monitoring of callus with digital radiography (X-ray) is the primary bone healing evaluation, assessing the number of bridged callus formations. However, this method is subjective and nonquantitative. Recently, several quantitative monitoring methods, which could assess the recovery of the structure and biomechanical properties of the callus at different stages and the process of bone healing, have been extensively investigated. Read More

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Quality control in PET/CT and PET/MRI: Results of a survey amongst European countries.

Phys Med 2022 Jul 20;99:16-21. Epub 2022 May 20.

University Hospital Maggiore della Carità, Novara, Italy. Electronic address:

Purpose: An EFOMP Working Group (WG) was created in 2020 to establish recommendations for PET/CT/MRI Quality Control (QC). The WG's intention was to create a document containing a set of measurements suitable for routine practice. In order to map the current situation in PET facilities, the WG prepared a survey addressed to European Medical Physics Experts (MPE). Read More

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Research on detection method of bleeding point in two-dimensional DSA image based on parametric color imaging.

Comput Biol Med 2022 Jul 13;146:105496. Epub 2022 Apr 13.

College of Electronic Information Engineering, Beihang University, 100191, Beijing, China; College of Computer Science and Technology, Jilin University, Changchun, 130012, China. Electronic address:

Digital Subtraction Angiography (DSA) has become an essential method in diagnosing and detecting vascular bleeding points. According to the frame number sequence, doctors subjectively analyze gray-black DSA data to diagnose vascular bleeding points. This study carried out parametric color imaging processing on the original two-dimensional DSA image sequence to assist doctors in judging blood vessel bleeding more accurately and quickly on angiography results and obtain quantitative standards. Read More

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