The Experts below are selected from a list of 57 Experts worldwide ranked by ideXlab platform

I Whyte - One of the best experts on this subject based on the ideXlab platform.

  • Digital mobile telephones and interference of Ophthalmic equipment
    Eye, 2007
    Co-Authors: P Lian, W S Ng, I Whyte
    Abstract:

    Aim To assess the effect of mobile telephone electromagnetic interference on electronic Ophthalmic equipment. Methods Prospective audit with mobile telephones placed at distances of 3 m, 1 m, and 30 cm from, and in contact with, electronic Ophthalmic equipment. Any interruption or cessation of the function of the Ophthalmic Device was assessed with the mobile telephones in standby, and in dialling or receiving modes. Any alterations of displayed digital figures or numbers were also assessed. Results A total of 23 electronic Ophthalmic Devices in two hospital ophthalmology outpatient departments were evaluated. All six mobile telephones used, and 22 (95.7%) of the 23 Ophthalmic equipment evaluated had the Conformité Européene (CE) mark. No Device showed any interruption or cessation of function. There were no alterations of displayed digital figures or numbers. The only effect of any kind was found with four instruments (1 non-CE marked), where there was temporary flickering on the screen, and only occurred when the mobile telephones were dialling or receiving at a distance of 30 cm or less from the instruments. Conclusion This study shows that among the electronic Ophthalmic Devices tested, none suffered failure or interruption of function, from mobile telephone interference. Although not comprehensive for all Ophthalmic equipment, the results question the need for a complete ban of mobile telephones in Ophthalmic departments. It highlights the need for a controlled, objectively measured study of the clinically relevant effects of mobile telephones in the ophthalmology outpatient setting.

  • Digital mobile telephones and interference of Ophthalmic equipment
    Eye, 2005
    Co-Authors: P Lian, W S Ng, I Whyte
    Abstract:

    Aim To assess the effect of mobile telephone electromagnetic interference on electronic Ophthalmic equipment. Methods Prospective audit with mobile telephones placed at distances of 3 m, 1 m, and 30 cm from, and in contact with, electronic Ophthalmic equipment. Any interruption or cessation of the function of the Ophthalmic Device was assessed with the mobile telephones in standby, and in dialling or receiving modes. Any alterations of displayed digital figures or numbers were also assessed. Results A total of 23 electronic Ophthalmic Devices in two hospital ophthalmology outpatient departments were evaluated. All six mobile telephones used, and 22 (95.7%) of the 23 Ophthalmic equipment evaluated had the Conformite Europeene (CE) mark. No Device showed any interruption or cessation of function. There were no alterations of displayed digital figures or numbers. The only effect of any kind was found with four instruments (1 non-CE marked), where there was temporary flickering on the screen, and only occurred when the mobile telephones were dialling or receiving at a distance of 30 cm or less from the instruments. Conclusion This study shows that among the electronic Ophthalmic Devices tested, none suffered failure or interruption of function, from mobile telephone interference. Although not comprehensive for all Ophthalmic equipment, the results question the need for a complete ban of mobile telephones in Ophthalmic departments. It highlights the need for a controlled, objectively measured study of the clinically relevant effects of mobile telephones in the ophthalmology outpatient setting.

P Lian - One of the best experts on this subject based on the ideXlab platform.

  • Digital mobile telephones and interference of Ophthalmic equipment
    Eye, 2007
    Co-Authors: P Lian, W S Ng, I Whyte
    Abstract:

    Aim To assess the effect of mobile telephone electromagnetic interference on electronic Ophthalmic equipment. Methods Prospective audit with mobile telephones placed at distances of 3 m, 1 m, and 30 cm from, and in contact with, electronic Ophthalmic equipment. Any interruption or cessation of the function of the Ophthalmic Device was assessed with the mobile telephones in standby, and in dialling or receiving modes. Any alterations of displayed digital figures or numbers were also assessed. Results A total of 23 electronic Ophthalmic Devices in two hospital ophthalmology outpatient departments were evaluated. All six mobile telephones used, and 22 (95.7%) of the 23 Ophthalmic equipment evaluated had the Conformité Européene (CE) mark. No Device showed any interruption or cessation of function. There were no alterations of displayed digital figures or numbers. The only effect of any kind was found with four instruments (1 non-CE marked), where there was temporary flickering on the screen, and only occurred when the mobile telephones were dialling or receiving at a distance of 30 cm or less from the instruments. Conclusion This study shows that among the electronic Ophthalmic Devices tested, none suffered failure or interruption of function, from mobile telephone interference. Although not comprehensive for all Ophthalmic equipment, the results question the need for a complete ban of mobile telephones in Ophthalmic departments. It highlights the need for a controlled, objectively measured study of the clinically relevant effects of mobile telephones in the ophthalmology outpatient setting.

  • Digital mobile telephones and interference of Ophthalmic equipment
    Eye, 2005
    Co-Authors: P Lian, W S Ng, I Whyte
    Abstract:

    Aim To assess the effect of mobile telephone electromagnetic interference on electronic Ophthalmic equipment. Methods Prospective audit with mobile telephones placed at distances of 3 m, 1 m, and 30 cm from, and in contact with, electronic Ophthalmic equipment. Any interruption or cessation of the function of the Ophthalmic Device was assessed with the mobile telephones in standby, and in dialling or receiving modes. Any alterations of displayed digital figures or numbers were also assessed. Results A total of 23 electronic Ophthalmic Devices in two hospital ophthalmology outpatient departments were evaluated. All six mobile telephones used, and 22 (95.7%) of the 23 Ophthalmic equipment evaluated had the Conformite Europeene (CE) mark. No Device showed any interruption or cessation of function. There were no alterations of displayed digital figures or numbers. The only effect of any kind was found with four instruments (1 non-CE marked), where there was temporary flickering on the screen, and only occurred when the mobile telephones were dialling or receiving at a distance of 30 cm or less from the instruments. Conclusion This study shows that among the electronic Ophthalmic Devices tested, none suffered failure or interruption of function, from mobile telephone interference. Although not comprehensive for all Ophthalmic equipment, the results question the need for a complete ban of mobile telephones in Ophthalmic departments. It highlights the need for a controlled, objectively measured study of the clinically relevant effects of mobile telephones in the ophthalmology outpatient setting.

W S Ng - One of the best experts on this subject based on the ideXlab platform.

  • Digital mobile telephones and interference of Ophthalmic equipment
    Eye, 2007
    Co-Authors: P Lian, W S Ng, I Whyte
    Abstract:

    Aim To assess the effect of mobile telephone electromagnetic interference on electronic Ophthalmic equipment. Methods Prospective audit with mobile telephones placed at distances of 3 m, 1 m, and 30 cm from, and in contact with, electronic Ophthalmic equipment. Any interruption or cessation of the function of the Ophthalmic Device was assessed with the mobile telephones in standby, and in dialling or receiving modes. Any alterations of displayed digital figures or numbers were also assessed. Results A total of 23 electronic Ophthalmic Devices in two hospital ophthalmology outpatient departments were evaluated. All six mobile telephones used, and 22 (95.7%) of the 23 Ophthalmic equipment evaluated had the Conformité Européene (CE) mark. No Device showed any interruption or cessation of function. There were no alterations of displayed digital figures or numbers. The only effect of any kind was found with four instruments (1 non-CE marked), where there was temporary flickering on the screen, and only occurred when the mobile telephones were dialling or receiving at a distance of 30 cm or less from the instruments. Conclusion This study shows that among the electronic Ophthalmic Devices tested, none suffered failure or interruption of function, from mobile telephone interference. Although not comprehensive for all Ophthalmic equipment, the results question the need for a complete ban of mobile telephones in Ophthalmic departments. It highlights the need for a controlled, objectively measured study of the clinically relevant effects of mobile telephones in the ophthalmology outpatient setting.

  • Digital mobile telephones and interference of Ophthalmic equipment
    Eye, 2005
    Co-Authors: P Lian, W S Ng, I Whyte
    Abstract:

    Aim To assess the effect of mobile telephone electromagnetic interference on electronic Ophthalmic equipment. Methods Prospective audit with mobile telephones placed at distances of 3 m, 1 m, and 30 cm from, and in contact with, electronic Ophthalmic equipment. Any interruption or cessation of the function of the Ophthalmic Device was assessed with the mobile telephones in standby, and in dialling or receiving modes. Any alterations of displayed digital figures or numbers were also assessed. Results A total of 23 electronic Ophthalmic Devices in two hospital ophthalmology outpatient departments were evaluated. All six mobile telephones used, and 22 (95.7%) of the 23 Ophthalmic equipment evaluated had the Conformite Europeene (CE) mark. No Device showed any interruption or cessation of function. There were no alterations of displayed digital figures or numbers. The only effect of any kind was found with four instruments (1 non-CE marked), where there was temporary flickering on the screen, and only occurred when the mobile telephones were dialling or receiving at a distance of 30 cm or less from the instruments. Conclusion This study shows that among the electronic Ophthalmic Devices tested, none suffered failure or interruption of function, from mobile telephone interference. Although not comprehensive for all Ophthalmic equipment, the results question the need for a complete ban of mobile telephones in Ophthalmic departments. It highlights the need for a controlled, objectively measured study of the clinically relevant effects of mobile telephones in the ophthalmology outpatient setting.

Johannes F. De Boer - One of the best experts on this subject based on the ideXlab platform.

  • Parallel scanning laser ophthalmoscope (PSLO) for high-speed retinal imaging
    Investigative Ophthalmology & Visual Science, 2014
    Co-Authors: Kari V. Vienola, Mathivanan Damodaran, Boy Braaf, Koenraad A. Vermeer, Johannes F. De Boer
    Abstract:

    Purpose High-speed imaging of the retina is crucial for obtaining high quality images in the presence of eye motion. To improve the speed of traditional scanners, a high-speed Ophthalmic Device is presented using a digital micro-mirror Device (DMD) for confocal imaging with multiple simultaneous spots. Methods The PSLO consists of three parts: an illumination, an imaging and a detector arm (Fig. 1). The DMD is uniformly illuminated with a near-infrared (850 nm) LED. The separation between ON positioned mirror elements was made large enough to eliminate cross-talk between neighboring virtual pinholes, and therefore allowed multi-spot confocal imaging across the whole field of view (FOV). The DMD is programmed to project series of shifted point pattern configurations, effectively scanning the spots over the sample surface. The DMD was imaged onto a sample and the returning light was tapped of via a beam-splitter and imaged on a CMOS camera. Multiple point illuminated frames are combined to form one confocal wide-field image. As a proof of principle images of a resolution target were acquired with the PSLO system. Results The resolution target was imaged with a pattern with virtual pinhole size of 2x2 mirrors and the separation between two pinholes was 4 mirror elements. Figure 1B shows the results for combining 9 illumination patterns to form the final image. Conclusions It is possible to create wide-field confocal images with the PSLO system. In theory the DMD can achieve higher frame rates than traditional scanner-based systems by illuminating the sample with multiple spots. In retinal imaging, such a setup will provide better images because higher imaging speeds reduce motion artifacts.

  • Parallel scanning laser ophthalmoscope for retinal imaging
    2014
    Co-Authors: Kari V. Vienola, Mathivanan Damodaran, Boy Braaf, Mattijs De Groot, Koenraad A. Vermeer, Johannes F. De Boer
    Abstract:

    Introduction High-speed imaging of the retina is crucial for obtaining high quality images in the presence of eye motion. To improve the speed of traditional scanners, a high-speed Ophthalmic Device is presented using a digital micro-mirror Device (DMD) for confocal imaging with multiple simultaneous spots. Methods An experimental Ophthalmic imaging system was constructed based on an 850 nm LED and a DMD containing 1024 x 768 micro-mirrors. Single mirror elements are sparsely turned ON to create multiple spots over the whole field of view. The DMD is programmed to project series of shifted point pattern configurations, effectively scanning the spots over the sample surface. The backscattered light from the retina is tapped off via a beam-splitter and imaged onto a CMOS camera. A confocal image is constructed by applying an image mask of virtual pinholes to each recorded frame. A wide-field confocal image is then created by combining all frames in a single image. Results In the figure a dollar note was imaged with all mirrors ON (widefield) and with multiple spots configuration (every 100th mirror ON). In widefield mode light is detected from different planes above and below the focal plane. When using multiple spots and virtual pinholes, only light from the focal plane is detected. The image on the right shows clearly the microstructure of the bank note. Conclusions It is possible to create confocal images with the PSLO system. In theory the DMD can achieve higher frame rates than traditional scanner-based systems (> 2 kHz) by illuminating the sample with multiple spots.

Kari V. Vienola - One of the best experts on this subject based on the ideXlab platform.

  • Parallel scanning laser ophthalmoscope (PSLO) for high-speed retinal imaging
    Investigative Ophthalmology & Visual Science, 2014
    Co-Authors: Kari V. Vienola, Mathivanan Damodaran, Boy Braaf, Koenraad A. Vermeer, Johannes F. De Boer
    Abstract:

    Purpose High-speed imaging of the retina is crucial for obtaining high quality images in the presence of eye motion. To improve the speed of traditional scanners, a high-speed Ophthalmic Device is presented using a digital micro-mirror Device (DMD) for confocal imaging with multiple simultaneous spots. Methods The PSLO consists of three parts: an illumination, an imaging and a detector arm (Fig. 1). The DMD is uniformly illuminated with a near-infrared (850 nm) LED. The separation between ON positioned mirror elements was made large enough to eliminate cross-talk between neighboring virtual pinholes, and therefore allowed multi-spot confocal imaging across the whole field of view (FOV). The DMD is programmed to project series of shifted point pattern configurations, effectively scanning the spots over the sample surface. The DMD was imaged onto a sample and the returning light was tapped of via a beam-splitter and imaged on a CMOS camera. Multiple point illuminated frames are combined to form one confocal wide-field image. As a proof of principle images of a resolution target were acquired with the PSLO system. Results The resolution target was imaged with a pattern with virtual pinhole size of 2x2 mirrors and the separation between two pinholes was 4 mirror elements. Figure 1B shows the results for combining 9 illumination patterns to form the final image. Conclusions It is possible to create wide-field confocal images with the PSLO system. In theory the DMD can achieve higher frame rates than traditional scanner-based systems by illuminating the sample with multiple spots. In retinal imaging, such a setup will provide better images because higher imaging speeds reduce motion artifacts.

  • Parallel scanning laser ophthalmoscope for retinal imaging
    2014
    Co-Authors: Kari V. Vienola, Mathivanan Damodaran, Boy Braaf, Mattijs De Groot, Koenraad A. Vermeer, Johannes F. De Boer
    Abstract:

    Introduction High-speed imaging of the retina is crucial for obtaining high quality images in the presence of eye motion. To improve the speed of traditional scanners, a high-speed Ophthalmic Device is presented using a digital micro-mirror Device (DMD) for confocal imaging with multiple simultaneous spots. Methods An experimental Ophthalmic imaging system was constructed based on an 850 nm LED and a DMD containing 1024 x 768 micro-mirrors. Single mirror elements are sparsely turned ON to create multiple spots over the whole field of view. The DMD is programmed to project series of shifted point pattern configurations, effectively scanning the spots over the sample surface. The backscattered light from the retina is tapped off via a beam-splitter and imaged onto a CMOS camera. A confocal image is constructed by applying an image mask of virtual pinholes to each recorded frame. A wide-field confocal image is then created by combining all frames in a single image. Results In the figure a dollar note was imaged with all mirrors ON (widefield) and with multiple spots configuration (every 100th mirror ON). In widefield mode light is detected from different planes above and below the focal plane. When using multiple spots and virtual pinholes, only light from the focal plane is detected. The image on the right shows clearly the microstructure of the bank note. Conclusions It is possible to create confocal images with the PSLO system. In theory the DMD can achieve higher frame rates than traditional scanner-based systems (> 2 kHz) by illuminating the sample with multiple spots.