Download Retinal Angiography and Optical Coherence Tomography by Thomas M. Clark BSc, CRA (auth.), J. Fernando Arevalo MD, PDF
By Thomas M. Clark BSc, CRA (auth.), J. Fernando Arevalo MD, FACS (eds.)
OCT is a comparatively new imaging procedure that's turning into more and more well known between ophthalmologists in either inner most and educational settings. Imaging has been a gradual relocating sector in ophthalmology for it slow, yet now OCT is offering one other, extra specific resource of demonstrable switch within the eye, in diagnostic, healing or post-surgical surroundings. OCT and ultrasound either degree advancing sickness states and submit surgical therapeutic. the adaptation is that OCT indicates extra sophisticated alterations, really post-surgically.
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18. (A,B) The hyperfluorescence of clinically significant diabetic macular edema results from leakage of dye from microaneurysms. R. D. Regillo Fig. 19. The petaloid pattern of hyperfluorescence seen in this patient with cystoid macular edema following cataract extraction. Fig. 20. (A–D) Leakage of dye from a macroaneurysm. 2 Fluorescein Angiography: General Principles and Interpretation 41 Fig. 21. Pooling of fluorescein dye, as seen in a case of central serous chorioretinopathy that exhibits the classic smokestack appearance as the dye pools (A–D), a pigment epithelial defect (E,F), and an in intraocular tumors as seen in this melanoma (G).
13). Fig. 13. Hypofluorescence results in capillary nonperfusion in retinal vein occlusion (A,B) and diabetic retinopathy (C). R. D. Regillo Fig. 14. (A–B) Optic nerve pit resulting in hypofluorescence of the optic nerve head. Blockage of choroidal filling is less apparent in the angiogram because of the attenuation of the choroidal signal by the normal retinal pigment epithelium. Choroidal hypofluorescence may result from a variety of causes including malignant hypertension, toxemia of pregnancy, and vasculitis such as lupus.
Finally, after the patient is properly positioned, the camera controls have been mastered, the patient’s eye and camera have been adjusted for the proper field of view, and a critical focus has been achieved, the image can be taken. Operational Specifics We have looked at areas of patient management and image acquisition. We conclude this chapter by looking at some operational specifics associated with the various imaging systems. These include the production of various types of hardcopy with which the clinician evaluates the patient’s condition and maps out the treatment strategies.