Download - 59732074 Introduction HRA2 TC
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HRA 2 introduction
© Heidelberg Engineering GmbH
Heidelberg, Germany
www.HeidelbergEngineering.com
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Heidelberg Retina Angiograph 2
Confocal Digital Alta resolución Alta sensibilidad Alto contraste Dinámica y simultánea angiografía con
fluoresceína y sistema de angiografía con verde indocianina
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Sistema de barrido láser confocal
LaserLaser
Detector
Diafragma
Divisor de hazDivisor de haz
x-y-z unidadx-y-z unidad
LenteLente Plano focalPlano focal
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LaserLaser
Detector
Diafragma
Haz divisorHaz divisor
x-y-z unidadx-y-z unidad
LenteLente Plano focalPlano focal
Sistema de barrido láser confocal
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HRA 2 Cabezal de la cámara
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Fuentes de Láser HRA 2 vs. HRA/C
HRA/CArgon Laser
andCamera Power Supply
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Fuentes de Láser HRA 2 vs. HRA/C
HRA/CArgon Laser
andCamera Power Supply
HRA 2OPSL Laser
withCamera Power Supply
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Angiografía Colorantes de fluorescencia La estimulación con luz de longitud de onda
específica provoca la emisión de luz fluorescente por parte de la fluoresceína
Fluoresceína Excitación/Emisión: Luz visible (488/530 nm)
Verde de indocianina (ICG) Excitación/Emisión: Luz infrarroja (790/830 nm)
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HRA 2 Modos de imagen
Angiografía con fluoresceína (AF) Angiografía con verde de indocianina
(ICGA) Imagen libre de rojo (reflectacia azul) (RF) Imagen de reflectancia infrarroja (IR) Simultanea AF + ICGA Simultanea AF + IR Simultanea ICGA + IR
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Heidelberg Retina Angiograph
Sistema de barrido láser: Exposición de luz baja Imagen continua Imagen digital Simultánea AF/ICGA
Sistema óptico confocal: Imagen de alto contraste Información en tres dimensiones
Alta sensibilidad y eficiencia: imagen de fases tardías
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Exposición luz baja
La fluoresceína emite fluorescencia cuando es excitada en una longitud de onda específica La línea láser es muy eficaz para la excitación
Sistema de barrido láser no necesita detector de dos dimensiones Alta sensibilidad de ‘point’-detector
La exposición de luz a la retina requiere sólo del 1% de la exposición requerida por los sistemas fotográficos.
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Imágenes continuas
Imágenes continuas permiten estudiar: Procesos dinámicos Flujo sanguíneo De especial importancia en las fases tempranas
de la angiografía
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Imagen digital
Adquisición y almacenamiento de imagen digital en vez de imagen analógica.
La imagen digital ofrece múltiples capacidades para mejorar la imagen y su procesamiento
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Simultanea AF y ICGA
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Imagen contraste
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Angiografías en tres dimensiones
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Imagen de alta calidad de fases tardías en angiografía
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Comparison HRA 2 vs. HRA/CHRA/C HRA 2
Campo de visión (grados) 10x10, 20x20, 30x30 15x15, 20x20, 30x30
Tamaño de imagen [pixels] 256x256 (std. res.)512x512 (high res.)
384x384 (15°)
(768x786) 512x512 (20°)
(1024x1024) 768x768 (30°)
(1536x1536)
Resolucion pixel [µm/pixel] 10, 20, 30 (std. res.) 5, 10, 15 (high res.)
10 (5)
Tamaño de imagen [pixels]en modo simultaneo o continuo
2x256x256 2x384x384 (15°)2x512x512 (20°)2x768x768 (30°)
max .image frequency [frames/sec]
20 (std. res.)13 (high res.)
16 (~8) (15°) 13 (~6) (20°) 9 (~4) (30°)
Line scan frequency 8 kHz (high res)
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HRA 2 Fuentes de láser
AF: Láser de bombeo
Óptico de estado sólido(OPSL)
, 488 nm RF: el mismo que AF ICGA: Láser de diodo
790 nm IR: Láser de diodo 820 nm
OPSL
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HRA 2 Angiography Characteristics
AF Longitud de onda de excitación: 488 nm, 0.2
mW/cm2
Bloqueo de la luz de excitación: 1 · 10-6
50 % transmisión en: 499 nm Emisión de detección de eficiencia: 85 %
ICGA Excitation wavelength: 790 nm, 2.0 mW/cm2
Blocking of excitation light: 3 · 10-6
50 % transmission at: 817 nm Emission detection efficiency: 66 %
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Comparison HRA 2 vs. HRA/C
HRA/C HRA 2
laser source, FA argon ion, 488 nm OPSL, 488 nm
laser source, ICGA diode, 790 nm diode, 790 nm
fixation target external (fellow eye) internal array of 3x3 targets, and external
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Laser/488 EyeNaFl
Filter/500488 nm
530 nm
Detector
Laser/ 488488
HRA2: Fluorescein Angiography
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Laser/790 EyeICG
Filter/810790 nm
830 nm
Detector
Laser/830830 nm
HRA: ICG Angiography
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intensity
wavelength800 nm 830 nm
max.excitation
max.emission
excitation emission
ICG Excitation and Emission
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intensity
wavelength790 nm 810 nm
excitationwavelength
filteredge
useful emission (>60%)
HRA: ICG Excitation and Efficiency
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HRA 2 Adquisición de imágenes
Single images “Unlimited” number of images
Temporal image sequence Up to 100 seconds of digital video (512 MB) Variable frame rate up to 16 Hz
3D confocal image sequence Variable scan depth up to 8 mm 8 images / mm depth
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HRA 2 Acquisition Modes
Stereo image pair Mean image sequence
Adjustable number of images Automatic computation of mean
Composite image sequence Guided by internal grid of 3 x 3 fixation lights Creates 60° x 60 ° image
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HRA 2 Internal Fixation Targets
Acquisition of nine 30° images
at 3 x 3 fixation target positions
creates 60° x 60° mosaic image
15°
30°
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HRA 2 Internal Fixation Targets
Acquisition of nine 30° images
at 3 x 3 fixation target positions
creates 60° x 60° mosaic image
60°
60°
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HRA 2 µP Controlled
Camera, Touch Panel, Laser, Power Supply, Computer: Integrated byµP network
[HRA 2 Camera Control Electronics]
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Sapphire Laser
Computer
Frame Grabber [FireWire / USB 2.0]
RS 232 [FireWire / USB 2.0]
HRA II Camera Head
Camera Mount
Power Supply
µC
data l/r
Operation Panel
power
image data
safety
µC
µC
power
HRA 2 Communication
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HRA 2 Touch Screen Panel Operation
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HRA 2 Touch Screen Panel Operation
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HRA 2 Touch Screen Panel Operation
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HRA 2 Touch Screen Panel Operation
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HRA 2 Touch Screen Panel Operation
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Fluorescein Angiography 30°
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Simultaneous FA / ICGA 30°
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Questions ?