Spectral Domain Optical Coherence Tomography (SD-OCT) Analicia Behnke November 27, 2012
SD-OCT SD OCT screens for retinopathy of prematurity in babies eyes Uses narrow beams of light to penetrate deep layers of tissue and produce a 3 -D image of posterior section of an infants eye
What is retinopathy of prematurity? Eye disorder effecting premature infants › Weighing less than 2. 75 pounds › Born earlier than 31 weeks ROP is caused by abnormal growth of blood vessels in the retina, causing the retina to be pulled out of position and even become detached › Five stages, ranging from mild abnormal growth to detached cornea
Cause of ROP Abnormal growth happens because normal retinal development doesn’t complete until a few weeks after birth › Before blood vessels reach edge of retina, growth stops. › The edge of the retina doesn’t receive enough oxygen so it sends out signals to other areas of the retina for nourishment, resulting in abnormal growth of vessels. › New blood vessels are fragile and can break easily causing bleeding and scaring, which pulls on the retina when they shrink, causing a detached retina
Testing for ROP Usually tested about 46 weeks after birth › Eyelid speculum is used to keep the eyes open › Lens with a light will be used to look in the babies eyes › Use a scleral depressor to move the eye into different positions o OCT- Optical Coherence Tomography Ø Reflects light to create 2 D and 3 D images of the eye Ø Used moving reference mirror to measure the time it took for light to be reflected • Lengthy process • Limited image quality
SD-OCT Developed at Duke University Measures multiple wavelengths of reflected light › 100 times faster › 40, 000 pictures per second for clearer images Tru. Tack technology. Tracks eye movement during imaging › Detect changes during the scan
Benefits Hand-held probe allows the baby to stay in the incubator during testing Allows for cross-sectional images of the retina, allowing for better visualization Reduces time spent on diagnosis › Faster diagnosis, faster treatment, less damage to an infants vision
Sources "New Device To Detect Blindness In Babies | Biomedical Engineering & Biotechnology News. " New Device To Detect Blindness In Babies | Biomedical Engineering & Biotechnology News. N. p. , 16 Aug. 2012. Web. 17 Nov. 2012. <http: //www. biomedicalblog. com/new-device-to-detect-blindness-inbabies/22000/>. Facts About Retinopathy of Prematurity (ROP). " Facts About Retinopathy of Prematurity [NEI]. N. p. , n. d. Web. 24 Nov. 2012. <http: //www. nei. nih. gov/health/rop. asp>. "Eye Exam for Retinopathy of Prematurity by Alexandra Howson, Ph. D. " Eye Exam for Retinopathy of Prematurity. Beth Israel Deaconess Medical Center, 2008. Web. 25 Nov. 2012. <http: //www. bidmc. org/Your. Health/Medical. Procedures. aspx? Chunk. ID=588196>. "Spectral-Domain Optical Coherence Tomography (SD-OCT). " Heidelbergengineeringcom RSS. Heidelberg Engineering, 2012. Web. 25 Nov. 2012. <http: //www. heidelbergengineering. com/us/products/spectralismodels/technology/spectral-domain-oct/>. Lee AC, Maldonado RS, Sarin N, O'Connell RV, Wallace DK, Freedman SF, Cotten M, Toth CA. "National Center for Biotechnology Information. " (2011): n. pag. Print.
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