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	Occlusion - Wikipedia, the free encyclopedia
		Occlusion is a term indicating that the state of something, which is normally open, is now totally closed.
		In dentistry, the term is used to refer to the manner in which the teeth from upper and lower arches come together when the mouth is closed.
		In computer graphics and image processing, occlusion is the effect of one object in 3-D space blocking another object from view.
	en.wikipedia.org /wiki/Occlusion (127 words)

	Punctal and intra-canalicular occlusion - a guide for the practitioner
		However, punctum and intracanalicular occlusion are only appropriate for certain patients with aqueous abnormalities, and it is important that a correct diagnosis is made to allow selection of suitable patients for the procedure.
		In a retrospective examination of the effect of punctal occlusion on dry eye disorders using Freeman silicone plug insertion, a significant decrease in tear osmolarity was found together with a reduction in rose bengal staining in 75% of the eyes examined (Gilbard et al, 1989).
		They suggest that occlusion of one punctum on one or both sides should be reserved for cases when insertion in the upper punctum is difficult.
	www.academy.org.uk /tutorials/pplugs.htm (3301 words)

	Dr. Koop - Retinal Vein Occlusion- Health Encyclopedia and Reference
		Retinal vein occlusion is a common form of retinal vascular disease, especially in middle-aged and older individuals.
		Central retinal vein occlusion can be associated with the proliferation of new vessels on the surface of the iris, which can lead to a form of recalcitrant, blinding glaucoma.
		The major risk factors for retinal vein occlusion are age, hypertension, atherosclerotic vascular disease, and diabetes mellitus.
	www.drkoop.com /encyclopedia/43/265.html (708 words)

	Occlusion
		Thus courses in dental school that dealt with occlusion were most concerned with such concepts as which cusp of an upper molar occluded (came together) with which particular groove in the lower molar that it touched when the patient closed his teeth together.
		In fact, occlusion is one of the most important factors in dentistry because the success or failure of practically everything a dentist does in a patient's mouth depends upon its ability to operate within the boundaries of the patient's physiologic occlusion.
		The brain is important in the concept of occlusion because it is the source of both the voluntary muscular activity which operates the system, as well as unconscious habits such as bruxing (grinding and clenching) which can lead to some of the most serious disease states of occlusion.
	www.doctorspiller.com /occlusion.htm (5579 words)

	Retinal artery occlusion
		Retinal artery occlusion refers to the closure of the central retinal artery and usually results in complete loss of vision in one eye.
		Occlusion of its branches causes loss of vision in only a portion of the field of vision.
		RAO is diagnosed by examination of the retina with an ophtalmoscope.
	www.lifesteps.com /gm/Atoz/ency/retinal_artery_occlusion.jsp (891 words)

	Gamasutra - Features - "Occlusion Culling Algorithms" [11.09.99]
		The Z-pyramid is thus the occlusion representation of this algorithm.
		The HV algorithm performs occlusion culling very efficiently because it only traverses visible octree nodes and their children, and it only renders the primitives in visible nodes.
		is the Z-pyramid that is the occlusion representation of this algorithm.
	www.gamasutra.com /features/19991109/moller_haines_02.htm (1735 words)

	Gamasutra - Features - "Occlusion Culling Algorithms" [11.09.99]
		In the book, the occlusion culling section is preceded by sections on backface and clustered culling, hierarchical view-frustum culling, portal culling, and detail culling.
		Such approaches go under the name of occlusion culling algorithms, since they try to cull away (avoid drawing) objects that are occluded, that is, inside the view frustum but not visible in the final image.
		The idea behind efficient occlusion culling algorithms is to perform some simple tests early on and so avoid sending data through much of the pipeline.
	www.gamasutra.com /features/19991109/moller_haines_01.htm (899 words)

	Renal artery occlusion
		Renal artery occlusion is a blockage of the major arteries that supply blood to the kidneys caused by thrombosis or embolism.
		Renal artery occlusion occurs when the flow of blood from the arteries leading to the kidneys becomes blocked by a blood clot or cholesterol emboli.
		Renal arterial occlusion is a serious and potentially life-threatening condition, and should always be treated by a healthcare professional familiar with the disorder.
	www.healthatoz.com /healthatoz/Atoz/ency/renal_artery_occlusion.jsp (696 words)

	Lung perfusion studies after detachable coil occlusion of persistent arterial duct -- Sreeram et al. 81 (6): 642 -- ...
		Complete ductal occlusion was confirmed by echocardiography 24 hours after the procedure in all patients.
		Transcatheter occlusion of a persistent arterial duct can be achieved with the use of several devices.
		Transcatheter occlusion of the persistently patent ductus arteriosus: forty-month follow-up and prevalence of residual shunting.
	www.heartjnl.com /cgi/content/full/81/6/642 (2070 words)

	[No title]
		The application begins an occlusion test and ends it; then, at some later point, it asks for the result, at which point the driver must stop and wait until the result from the previous test is back before the application can even begin the next one.
		If occlusion test X occurred before occlusion query Y, and the driver informs the app that occlusion query Y is done, the app can infer that occlusion query X is also done.
		Occlusion queries can be used to track the exact number of fragments that pass the depth test.
	oss.sgi.com /projects/ogl-sample/registry/NV/occlusion_query.txt (3423 words)

	Retinal Vein Occlusion
		Branch retinal vein occlusion typically occurs after age 50 with peak incidence between ages 50 and 70.
		An increased risk for development of branch retinal vein occlusion is demonstrated in individuals with a history of systemic hypertension, history of stroke or coronary artery disease, history of smoking, and history of glaucoma.
		Almost 10% of patients with branch retinal vein occlusion develop a central retinal vein occlusion or branch retinal vein occlusion in the other eye.
	www.retinamd.com /disorders/branch.htm (479 words)

	Ambient Occlusion
		While this could be used as a portion of a bigger shader, ambient occlusion tends to be very computationally expensive.
		Consequently, would be smarter to do a single ambient occlusion pass and then either bake it in as a texture or composite it in in post.
		The ambient color pass either screens or overlays the diffuse pass, which in turn is multiplied by the occlusion pass.
	www-viz.tamu.edu /students/bmoyer/617/ambocc (845 words)

	Everflow Tutorials: Max 7: Ambient Occlusion
		There are many uses for the Ambient Occlusion shader, one being to accentuate details/edges and increase the realism of 3d renders.
		This occlusion is also known as the 'dirtpass' or 'dirtmap'.
		I will not go into the details of the science behind the magic, simply put; ambient occlusion fires rays into the scene at various angles from various points on the geometry, and determines which rays are blocked by other geometry, and creates a visual representation of the occlusion.
	everflow.com /support/tutorials/AO/Everflow_AmbientOcclusion1.html (543 words)

	Central retinal vein occlusion: what's the story? -- WILLIAMSON 81 (8): 698 -- British Journal of Ophthalmology
		Retinal vein occlusion and the prevalence of lipoprotein abnormalities.
		Incidence of ocular neovascularization with retinal vein occlusion.
		Behaviour of the iris vasculature in central retinal vein occlusion:a fluorescein angiographic study of the vascular response of the retina and the iris.
	bjo.bmjjournals.com /cgi/content/full/81/8/698 (5354 words)

	Handbook of Ocular Disease Management - RETINAL ARTERY OCCLUSION
		The main cause of retinal arterial occlusions is an embolism lodging in the central retinal artery where it constricts to pass through the lamina cribrosa, or in a smaller branch arteriole.
		The embolism may be comprised of aggregated fibrin and platelets arising from an ulcerated vessel wall thrombus, cholesterol from an ulcerated carotid artery plaque, or calcium from cardiac valvular disease.
		Neovascularization is not common with either central or branch artery occlusions, but if it does occur, it will do so rapidly, with rubeosis forming approximately four weeks after the occlusion.
	www.revoptom.com /handbook/sect5g.htm (597 words)

	OCCLUSION
		Centric occlusion is typically slightly anterior to centric relation.
		Protrusive excursion is the forward movement of the mandible from centric occlusion until the anterior teeth are edge to edge.Ideally there should be no contact between posterior teeth.
		Lateral excursion is the movement of the mandible from centric occlusion or centric relation to the right or left until the cuspids are in a cusp to cusp relationship.
	www.gpc.edu /~jweir/1902/occlusion.htm (603 words)

	Changes in occlusion pressure (P0.1) and breathing pattern during pressure support ventilation -- Perrigault et al. 54 ...
		The breathing pattern and occlusion pressure data are summarised in table 2.
		Occlusion pressure has been shown to be a predictor of the success of weaning in patients with or without obstructive lung
		Tracheal occlusion pressure: a simple index to monitor respiratory muscle fatigue during acute respiratory failure in patients with chronic obstructive pulmonary disease.
	www.thoraxjnl.com /cgi/content/full/54/2/119 (2476 words)

	Traumatic occlusion of the renal artery: helical CT diagnosis -- Nunez et al. 167 (3): 777 -- American Journal of ...
		Traumatic occlusion of the renal artery: helical CT diagnosis -- Nunez et al.
		Traumatic occlusion of the renal artery: helical CT diagnosis
		occlusion as depicted by helical CT and angiography, whether a CT nephrogram was obtained, the presence of a peripheral rim effect, and the
	www.ajronline.org /cgi/content/abstract/167/3/777 (391 words)

	Clinical features associated with internal carotid artery occlusion do not correlate with MRA cerebropetal flow ...
		absence of an ICA occlusion and the ipsilateral NAA/Cho ratio.
		Flow in the contralateral ICA and BA was 359 and 225 ml/min respectively, the ipsilateral NAA/Cho ratio was not significantly decreased.
		The role of the circle of Willis in carotid occlusion: assessment with phase contrast MR angiography and transcranial duplex.
	www.jnnp.com /cgi/content/full/70/3/333 (4325 words)

	Ambient Occlusion
		Ambient occlusion is a lighting technique used to give models a global illumination-like effect, as if it were lit from the entire hemisphere (rather than a point light).
		Since this requires computing occlusion at every triangle, this approach is in general O(N^2), although with efficiency structures (such as bounding volume hierarchies) it can be reduced to O(NlogN).
		Interestingly enough, this gives you a cosine-weighted ambient occlusion (because nTotalFragments is larger when you face the polygon straight-on than at an oblique angle).
	www.cs.unc.edu /~coombe/research/ao (555 words)

	Retinal artery occlusion
		The occlusion decreases the oxygen supply to the area of the retina nourished by the affected artery, causing permanent vision loss.
		In this photograph, the affected area of the retina is the pale, whitish-yellow region (blue arrows) that is normally supplied by the blocked artery (white arrow).
		Artery occlusion is diagnosed by examining the retina with an ophthalmoscope.
	www.stlukeseye.com /Conditions/ArteryOcclusion.asp (287 words)

	Lung Reperfusion Injury after Chronic or Acute Unilateral Pulmonary Artery Occlusion -- FADEL et al. 157 (4): 1294 -- ... (Site not responding. Last check: 2007-10-08)
		Lung reperfusion after a period of pulmonary artery occlusion is associated with pulmonary edema, fever, and leukopenia (22).
		Pulmonary artery occlusion is sufficient to increase pulmonary vascular permeability in rabbits.
		Bronchial circulation in pulmonary artery occlusion and reperfusion.
	www.ajrccm.org /cgi/content/full/157/4/1294 (3423 words)

	MedlinePlus Medical Encyclopedia: Retinal vessel occlusion
		Retinal vessel occlusion is a blockage of the blood supply to the retina, the light sensitive membrane in the back of the eye.
		In retinal artery occlusion, the cause of the blockage should be investigated.
		Patients with retinal artery occlusions should be evaluated by their primary care provider for the presence of hypertension, valvular heart disease, or carotid artery blockage.
	www.nlm.nih.gov /medlineplus/ency/article/001028.htm (554 words)

	Temporary Endovascular Balloon Occlusion of the Internal Carotid Artery with a Nondetachable Silicone Balloon Catheter: ...
		Balloon occlusion of the internal carotid artery in 40 cases of giant intracavernous aneurysms: technical aspects, cerebral monitoring and results.
		Gonzales CF, Moret J. Balloon occlusion of the carotid artery prior to surgery for neck tumors.
		Thromboembolic occlusion of the middle cerebral artery due to angiography and endovascular procedures: safety and efficacy of local intra-arterial fibrinolysis.
	www.ajnr.org /cgi/content/full/20/4/559 (3253 words)

	nV News - NVIDIA GeForce3 Preview - Occlusion Culling
		As discussed in the section on Lightspeed Memory Architecture, occlusion culling is a feature of the GeForce3, which is used to reduce the amount of memory and processing required by a 3D graphics application.
		The idea behind occlusion culling using the Z-buffer is to test whether on object is located closer to the camera (player viewport) than the current depth buffer value.
		The implementation of occlusion culling in the GeForce3 is a step in the right direction in order to maximize frame rates.
	www.nvnews.net /previews/geforce3/occlusion_culling.shtml (955 words)

	Myogenic and scalp signals evoked by midinspiratory airway occlusion -- Garden 89 (2): 422 -- Journal of Applied ...
		the onset of the occlusion was manually adjusted to occur at midinspiration.
		Experimental data were acquired from 250 consecutive breaths with midinspiratory occlusion and from 250 unoccluded control breaths.
		The onset and offset of the masseter EMG response coincided with the occlusion, as recorded in the Pm, in nine subjects.
	www.jap.org /cgi/content/full/89/2/422 (4419 words)

	Retinal vein occlusion
		Retinal vein occlusion refers to the closure of the central retinal vein that drains the retina or to that of one of its branches.
		Retinal vein occlusion (RVO) occurs when the central retinal vein, the blood vessel that drains the retina, or one of its branches becomes blocked.
		Retinal vein occlusion is difficult to prevent because the exact cause is still uncertain.
	www.healthatoz.com /healthatoz/Atoz/ency/retinal_vein_occlusion.jsp (878 words)

	Depth Map based Ambient Occlusion
		If you are studying ambient occlusion then this tutorial might still have some value by way of instruction on the reasoning and methodology of ambient occlusion but beyond that I think its time has past.
		Once the ambient occlusion pass has been rendered, the indirect lighting contribution to the scene is then calculated by applying an environment map of the scene into which the object is to be integrated.
		This shading model is attached to the objects in order to apply the ambient occlusion data during the environmental light pass.
	www.andrew-whitehurst.net /amb_occlude.html (1633 words)

	MedlinePlus Medical Encyclopedia: Acute arterial occlusion - kidney
		Acute renal arterial thrombosis; Renal artery embolism; Acute renal artery occlusion; Embolism - renal artery
		Acute arterial occlusion of the kidney may occur after injury or trauma to the abdomen, side, or occasionally the back.
		Damage caused by arterial occlusion may be temporary, but it is usually permanent.
	www.nlm.nih.gov /medlineplus/ency/article/001272.htm (717 words)

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