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At least 145 records · Page 8Linked to original sources
PubMed2002

Digital photography and 3D MRI-based multimodal imaging for individualized planning of resective neocortical epilepsy surgery.

PURPOSE: Invasive presurgical work up of pharmacoresistant epilepsies presumes integration of multiple diagnostic modalities into a comprehensive picture of seizure onset and eloquent brain areas. During resection, reliable transfer of evaluation results to the patient's individual anatomy must be made. We investigated the value of digital photography-based grid localization in combination with preoperative three-dimensional (3D) magnetic resonance imaging (MRI) for clinical routine. METHODS: Digital photographs of the exposed cortex were taken before and after grid placement. Location of electrode contacts on the cortex was identified and schematically indicated on native cortex prints. Accordingly, transfer of contact positions to a 3D MRI brain-surface rendering was carried out manually by using the rendering software. Results of the electrophysiologic evaluation were transferred to either electrode contact reproduction and co-registered with imaging-based techniques such as single-photon emission computed tomography (SPECT), positron emission tomography (PET), and functional MRI (fMRI). RESULTS: Digital photography allows precise and highly realistic documentation of electrode contact positions on the individual neocortical surface. Lesions underneath grids can be highlighted by semitransparent MRI surface rendering, and lobar boundaries can be identified. Because of integrating electrode contact positions into the postprocessed 3D MRI data set, imaging-based techniques can be codisplayed with the results of the electrophysiologic evaluation. Comparison with CT/MRI co-registration showed good accuracy of the method. However, grids not sewn to the dura at implantation can become subject to significant displacement. CONCLUSIONS: Digital photography in combination with preimplantation 3D MRI allows the generation of reliable tailored resection plans in neocortical epilepsy surgery. The method enhances surgical safety and confidence.

Adolescent↗
PubMed2002

Informed consent for clinical photography.

The question of (informed) consent to medical photography has long been a vexed one. This paper briefly considers key landmarks in the debate, and examines in detail the evolution of the Addenbrooke's NHS Trust policy Photography and Video Recordings of Patients: Confidentiality and Consent, Copyright and Storage. The impact of the 1998 Data Protection Act, the Department of Health's Model Policy on Consent, and the implications of wider access to digital photography are discussed together with their integration into the Addenbrooke's policy.

Computer Security↗
PubMed1999

Cross-polarized photography in the study of enamel defects in dental paediatrics.

An investigative trial was set up to determine the efficacy and practicality of using cross-polarized photography in the assessment of enamel defects. Twenty patients were photographed using this technique. The photography was assessed by ten clinicians, each of whom completed a questionnaire. Two calibrated examiners using the DDE Epidemiology and Screening Indices also undertook assessment. The results show overwhelming evidence to support the use of cross-polarization, with significant increase in agreement between the assessors, than that which could be obtained by conventional photography. It also enhanced the visual detail of enamel defects enabling changes in the appearance to be assessed by the DDE Indices.

Child↗
PubMed2006

Talking about hope: the use of participant photography.

Hope as a concept is commonly described in everyday life and is generally regarded as an important component of health and fulfillment. The importance of hope in relation to people who are marginalised due to illness or other social circumstances has been examined in the research literature. There is, however, a paucity of research addressing the importance of hope for people living with schizophrenia. The authors, in attempting to redress this paucity, identified that participants have difficulty articulating the concept of hope and its meaning to them as individuals. Participant photography was introduced as a research method during the course of the study. This paper presents an overview of the use of participant photography as a method to assist participants to describe their view of hope and its importance. A brief overview of findings are presented and compared with findings derived from traditional interview techniques. Participant photography proved beneficial in facilitating a discussion of hope at a very personal level. The potential ethical implications of this approach are discussed.

Adaptation, Psychological↗
PubMed1999

Evaluation of adeno-associated virus-mediated gene transfer into the rat retina by clinical fluorescence photography.

The purpose of this study was to evaluate recombinant adeno-associated virus (AAV) as an in vivo gene transfer vector for the retina and to explore the possibility of monitoring the expression of green fluorescent protein (GFP) using a noninvasive method. Rats were injected subretinally with rAAV-gfp or rAAV-lacZ. Strong expression of the reporter gene in a circular area surrounding the injection site was observed in retinal whole mounts and tissue sections. Higher magnification revealed that cells demonstrating high levels of green fluorescence were hexagonal in shape, indicating they were retinal pigment epithelium (RPE) cells. Histological observation of retinal sections demonstrated that recombinant AAV specifically transduced RPE cells. Ten animals were injected with rAAV-gfp for longitudinal studies and the fluorescence was monitored by retinal fluorescence photography. The GFP signal was detected in 100% of the animals as early as 2 weeks postinjection and remained present throughout the experimental period of 4 months. After 2 weeks, a gradual increase in the number of transduced cells occurred before reaching maximal levels of GFP expression at 8 weeks. This was followed by a small decrease over 4 weeks before reaching stable expression at 16 weeks. Our results demonstrated that rAAV efficiently transduces rat RPE cells and that retinal fluorescence photography is suitable for monitoring GFP expression. By using this noninvasive technique, we demonstrated that repetitive measurements of GFP expression in vivo in the rAAV-gfp-transduced retina are possible. This study demonstrated that retinal fluorescence photography is a potent tool for studying AAV-mediated gene delivery in the retina.

Animals↗
PubMed1999

35 mm film vs. digital photography for patient documentation: is it time to change?

35 mm photography is currently the standard method of documenting a patient's appearance and recording the post-operative changes. With rapidly advancing technology, the digital system is now capable of providing vivid pictures that have multiple advantages over conventional 35 mm photography. Namely, digital pictures are comparatively inexpensive to take, can be stored as digital information, easily retrieved, and immediate viewing and imaging are possible. For many applications in plastic surgery patient documentation, digital photography is now more affordable and flexible than the 35 mm film system. The following is a cost and quality comparison between the two systems.

Documentation↗
PubMed2001

Guidelines for standard photography in plastic surgery.

Uniform patient photographs that create permanent records are essential for any visually oriented medical specialty. These images are valuable for any plastic surgeon's practice for various reasons; thus, standards and recommendations for clinical photography should be well-known. There are several articles published on this issue, but it is still not uncommon to be exposed to medical publications and presentations that fail to satisfy clinical photography standards. This stimulated an interest in reviewing the important factors that are essential to achieve consistent, comparable clinical photographs with 35-mm single-lens reflex photography.

Guidelines as Topic↗
PubMed2002

Digital photography as a means of enhancing interconsultant communication in oncological cutaneous surgery.

Plastic surgeons have associated themselves closely with photography almost since the inception of medical photography. Photographs are used for documentation of medical records and comparison of pre- and postoperative status. Digital photography allows instant picture viewing and printing as well as Web-based mailing and, as a result, it facilitates interconsultant communication between the dermatologist, surgeon, and pathologist during the surgical treatment of cutaneous neoplasms. Moreover, it enhances patient monitoring during long-term follow-up.

Humans↗
PubMed2006

Correlation between topographic profiles of localized retinal nerve fiber layer defects as determined by optical coherence tomography and red-free fundus photography.

PURPOSE: To evaluate the topographic relationship of localized retinal nerve fiber layer (RNFL) defects as determined by optical coherence tomography (OCT) and by red-free fundus photography. METHODS: Sixty-five eyes of 65 patients with localized, wedge-shaped RNFL defects identified in red-free fundus photographs and with matching visual field defects were scanned with the Stratus OCT. On the resulting RNFL thickness report printout, segments of the line graph outside of the 95 and 99% normal limits were defined as "5% OCT defect" and "1% OCT defect," respectively. Correlations between the angular location and angular width of RNFL defects as determined by OCT (OCT defects) and by red-free fundus photography (red-free defects) were evaluated. RESULTS: Angular locations and widths of both 5 and 1% OCT defects were significantly correlated with corresponding red-free defects (all P values<0.001). CONCLUSIONS: There is a strong topographic correlation between characteristics of localized RNFL defects as determined by OCT and red-free photography.

Adult↗
PubMed2006

Fluorescence digital photography of acne using a light-emitting diode illuminator.

BACKGROUND/PURPOSE: The fluorescence findings of several dermatological diseases, such as erythrasma, tinea versicolor, and acne are helpful for diagnosis and follow-up. However, many experience difficulty taking photographic images of fluorescence. The aim of this study was to develop a 405 nm light-emitting diode (LED) system for fluorescence digital photography of acne and to determine whether such a diode can be used to evaluate acne. METHODS: Eight healthy acne patients were compared with controls by fluorescence digital photography using a digital camera equipped with a 405 nm LED illuminator. Digital photographs were taken by two different ways of exposure, i.e. appropriate exposure level and longer exposure. One side of the nose, cheek, and glabella was compared. The numbers and extents of fluorescence dots were counted and measured. As normal controls, seven individuals with apparent oiliness and no acne were enrolled. RESULTS: Red fluorescent facial dots were observed and photographed digitally using the 405 nm LED illuminator. These were more numerous and extensive on the glabella and cheeks of acne patients. CONCLUSION: Fluorescence digital photography of acne was successfully performed using a 405 nm LED illuminator. This illuminator could be used for acne evaluations.

Acne Vulgaris↗
PubMed2004

Photoscreening for diabetic retinopathy: a comparison of image quality between film photography and digital imaging.

PURPOSE: Retinal images from patients attending an urban screening centre before and after the transition from film photography to digital image acquisition were analysed for quality of image. METHODS: A total of 1946 diabetic patients, aged 12-92 years (mean 55.6 +/- 14.88 years), were included in this retrospective study of retinal screening techniques. Each imaging group was subdivided into age-matched groups. In all subjects pupils were pharmacologically dilated before photography. The images were reviewed by the same three experienced observers and graded at the time of screening from grade 1 (excellent quality) to grade 4 (unreadable). RESULTS: Of 938 patients in the film group, 31.3% had excellent images, 38.2% good, 22.7% poor and 7.8% were unreadable. Of the 1008 patients in the digital imaging group, 25.3% had excellent images, 46.3% good, 14.6% poor and 13.8% were unreadable. A significant difference was observed in patients over 65 years of age who exhibited a threefold increase in failure rate with digital imaging (33.7% v 11.3%)(P < 0.0001). CONCLUSION: In this study population a statistically significant degradation of image quality was observed in those older than 65 years following transition to digital photography. This has implications for service provision planning.

Adolescent↗
PubMed2000

Nutritional intake monitoring for nursing home residents: a comparison of staff documentation, direct observation, and photography methods.

BACKGROUND: The current approach to assessing nutritional intake requires nursing home (NH) staff to document total percentage of food and fluid consumed at each meal. Because NH staff tend to significantly overestimate total food intake, methods need to be developed to improve the accuracy of food intake measurement. OBJECTIVE: To compare three methods of assessing the nutritional intake of NH residents. RESEARCH DESIGN: Validation Study. SUBJECTS: Fifty-six NH residents in one facility. MEASURES: Total percentage of food and fluid intake of each resident for each of nine meals, or all three meals for 3 consecutive days, was assessed by: (1) Nursing home staff chart documentation, (2) Research staff documentation according to direct observations, and (3) Research staff documentation according to photographs of residents' trays before and after each meal. RESULTS: Research staff documentation of total intake and intake of all individual food and fluid items was similar for the direct observation and photography methods. In comparison with these two methods, NH staff documentation reflected a significant overestimate (22%) of residents' total intake levels. In addition, NH staff failed to identify the more than half (53%) of those residents whose intake levels were equal to or below 75% for most meals. CONCLUSIONS: The photography method of nutritional assessment yielded the same information as direct observations by research staff, and both of these methods showed the intake levels of NH residents to be significantly lower than the intake levels documented by NH staff. The photography method also has several advantages over a documentation system that relies on an observer to be present to record food and fluid intake levels.

Aged↗
PubMed2003

Digital photography and the assessment of therapeutic results after bleaching procedures.

UNLABELLED: The therapeutic outcome of tooth-bleaching procedures can be assessed by different methods, one of them being digital photography. However, none of the methods seems to be perfect. In this overview factors are discussed that have an influence on color rendition and image brightness in (digital) photography. A photographic procedure is proposed that results in comparable images. Beginning with a short description of some digital cameras currently used in dental photography, the article discusses the influence of light and camera technology on image brightness and color rendition in detail. Even if a highly standardized procedure is performed, there remain factors that affect color and brightness that cannot be excluded completely. Therefore, a photographic procedure is proposed that includes a piece of gray card in the picture as a neutral reference object. In this way, color casts can be eliminated and image brightness can be fine tuned using a standard image-editing program (Adobe Photoshop, Adobe Systems Incorporated, San Jose, CA, USA) before the relevant color values are metered by the same software. CLINICAL SIGNIFICANCE: A photographic procedure using digital cameras is proposed that is relatively simple and sufficiently precise to allow the assessment of the therapeutic outcome of tooth-bleaching procedures.

Color↗
PubMed2003

Microscopic photography for the restorative dentist.

UNLABELLED: Obtaining quality 35 mm photographs through an operating microscope challenges even the best of operators, and few clinicians have actually mastered the technique. This article discusses how to easily obtain quality high-resolution digital photographs at various magnifications using an operating microscope by adopting a technique that is easy to master and can be accomplished by any clinician who learns the skills. This review summarizes the advantages and disadvantages of microscopic photography, with a particular emphasis on digital photography. There is a discussion of the required equipment and necessary technique. The value of using digital photographic libraries at chair-side is explored. CLINICAL SIGNIFICANCE: Since the photographic skill with digital photography is easily mastered, clinicians can now more thoroughly document their cases and enhance their case-presentation skills. Teachers and lecturers can also draw upon large photographic relational databases to expand their presentation capabilities.

Dental Equipment↗
PubMed1977

Photography of the nerve fiber layer in retinal disturbances.

The diagnostic value of nerve fiber layer photography is assessed. The series comprised 39 patients with various neuro-ophthalmological diseases. Photography of the nerve fibers in the retina is time consuming and requires skill on the part of the photographer. Differences in the papillomacular nerve fiber layer are difficult to distinguish using the present methods. The wasting of nerve fibers could be documented by photography in advanced cases with bitemporal hemianopia, but not in small relative scotomas. Cases with homonymous hemianopia are interesting because lesions in the optic tract can be differentiated from affections of the second neuron on the basis of retinal nerve fiber atrophy. In demyelinating diseases inspection of the retinal nerve fiber layer is of clinical importance and diagnostic changes appear,

Adolescent↗
PubMed1996

Adding retinal photography to screening for diabetic retinopathy: a prospective study in primary care.

OBJECTIVE: To evaluate whether adding retinal photography improved community screening for diabetic retinopathy. SETTING: Mobile screening unit at rural and urban general practices in south west England. SUBJECTS: 1010 diabetic patients from primary care. DESIGN: Prospective study; patients were examined by ophthalmoscopy by general practitioners or opticians without fundal photographs and again with photographs, and assessments were compared to those of an ophthalmologist. MAIN OUTCOME MEASURES: Whether fundal photography improved the sensitivity of detection of retinopathy and referrable diabetic retinopathy, and whether this sensitivity could be improved by including a review of the films by the specialist. RESULTS: Diabetic retinopathy was detected by the ophthalmologist in 205 patients (20.5%) and referrable retinopathy in 49 (4.9%). The sensitivity of the general practitioners and opticians for referrable retinopathy with ophthalmoscopy was 65%, and improved to 84% with retinal photographs. General practitioners' sensitivity in detecting background retinopathy improved with photographs from 22% to 65%; opticians' sensitivity in detecting background retinopathy improved from 43% to 71%. The sensitivity of detecting referrable retinopathy by general practitioners improved from 56% to 80% with photographs; for opticians it improved from 75% to 88%. CONCLUSIONS: Combining modalities of screening by providing photography with specialist review of all films in addition to direct ophthalmoscopy through dilated pupils improves assessment and referral for diabetic retinopathy by general practitioners and opticians. With further training and experience, primary care screeners should be able to achieve a sensitivity that will achieve an effective, acceptable, and economical community based screening programme for this condition.

Ambulatory Care↗
PubMed2002

A randomised trial of skin photography as an aid to screening skin lesions in older males.

OBJECTIVES: We have previously shown that photographs assist in detection of change in skin lesions and designed the present randomised population based trial to assess the feasibility of photographs as an aid to management of skin cancers in older men. SETTING: 1899 men over fifty, identified from the electoral roll in two regions in New South Wales (NSW), Australia, were invited by mail to participate. METHODS: A total of 973 of 1037 respondents were photographed and randomised into intervention (participants given their photographs) or control groups (photographs withheld by investigators). At one and two years from the time of photography, all participants were advised to see their primary care practitioner for a skin examination. Those in the intervention group were examined with their photographs and those in the control group without their photographs. RESULTS: The results indicated that the practitioners were more likely to leave suspicious lesions in place for follow up observation (37% v 29%) (p=0.006) and less likely to excise benign non pigmented lesions (20 v 32%). There was little difference in excision rates for benign pigmented lesions (21% v 23%). Lesions excised were more likely to be non-melanoma skin cancer (58% v 42%) from patients who had photographs compared to those without photographs (p=0.005). The use of skin photography resulted in a substantial savings due to the reduced excision of benign lesions. CONCLUSIONS: These results suggest that it would be feasible to conduct a large scale randomised trial to evaluate the value of photography in early detection of melanoma and that such a trial could be cost effective due to the reduced excision of benign skin lesions.

Australia↗
PubMed1995

Anterior chamber angle biometry: a comparison of Scheimpflug photography and ultrasound biomicroscopy.

Scheimpflug photography and ultrasound biomicroscopy allow measurement of anterior chamber angle width. To analyze the value of both diagnostic tools, measurements of the same subjects were correlated. Anterior chamber angle width in both eyes of 20 volunteers without any ophthalmological case history was measured in eight meridians. Scheimpflug photographs were recorded on Kodak T-max 400 black-and-white film using a Topcon SL-45 camera. Measurement of chamber angle was done with the aid of a self-programmed PC software. Ultrasound biomicroscopic measurements were obtained using a Humphrey UBM 840 system with a 50-MHz transducer. The chamber angle was measured as described by Pavlin et al. The data of both methods were correlated and analysed for statistically significant differences using a paired t test (level of significance p < or = 0.05). Both methods showed similar changes in chamber angle width and were able to document a variation in angle width with regard to location. The correlation averaged at 0.64. In 4 meridians significant differences were found between the two methods. Scheimpflug photography, however, is unable to visualize directly the angle itself. Both methods are limited by the fact that the angle is defined by curvilinear structures, i.e. posterior corneal surface and anterior iris surface. Scheimpflug photography is able to document changes in angle configuration. Ultrasound biomicroscopy, however, is a more precise method, because it allows direct documentation of all structures involved in chamber angle configuration.

Anterior Chamber↗