I-Optical coherence tomography (OCT) ubuchwepheshe bokucabanga bokungabonakali obusetshenziselwa ukuthola izithombe eziphezulu zokuxazulula izithombe ze- retina . I-OCT ifana nokuhlolwa kwe-ultrasound, ngaphandle kokuthi ukucabangela kwenziwa ngokulinganisa ukukhanya kunokuba umsindo. I-OCT inquma ububanzi bokungqimba kwe-fibre nerve fibre ku- glaucoma nezinye izifo zensimbi ye-optic.
I-OCT Phakathi Nokuhlolwa Kwamehlo
Ukubumbana okubonakalayo kwe-Tomography kuthiwa yi-OCT, kuyindlela yama-optometrists kanye nama-ophthalmologists ukufanekisela ngemuva kweso kuhlanganise i-macula, i-optic nererve, i-retina, ne-choroid. Phakathi nokuhlolwa kwamehlo, ama-optometrists kanye ne-ophthalmologist bangabuka emuva kwehlo nesimo sawo semvelo. Kodwa-ke, ngezinye izikhathi odokotela badinga imininingwane eminingi noma badinga ukuhlola imininingwane ngezansi kwendawo okulukhuni ukuyibuka ngamasu ajwayelekile. Ngandlela-thile, ingafaniswa nokwenza i- "MRI ye-retina." Abanye bayichaza ngokuthi i-ultrasound ye-optical ngoba izithombe zibukeka phakathi kwezicubu ukuze zinikeze odokotela ngezithombe ezihamba phambili.
Imininingwane engabonwa nge-OCT isinqumo esiphezulu sokuthi odokotela babona izinto ezingakaze zibonwe ngaphambili ngeso lengqondo eliphilayo. Ngempela imininingwane yemifanekiso ingcono kunamamitha ayi-10, okungcono kune-MRI noma i-ultrasound.
Ngenxa yalokho, esikhundleni sokubheka iso nokuqagela ukuthi kungenzeka ukuthi i-retinal ukuvuvukala nje ngendlela ebukeka ngayo, i-OCT izosinika ulwazi oluningiliziwe futhi empeleni ikhombise ukuthi yiyiphi ingqimba ye-retina iqoqa i-edema edala uketshezi noma ukuvuvukala. Ingasetshenziselwa ukulandela ukuphulukiswa noma ukuxazulula lokho kuvuvukala.
Ukubumbana okubhekayo kwe-tomography kusebenza ngokusebenzisa i-interferometry. I-Interferometry ihlinzeka ochwepheshe bokunakekelwa kwezilwane ukuba babone izicubu ngokukhanya ngaphandle kwe-X ray, umsindo noma umsakazo we-radio. Isebenza ngokukhanyisa isibani sokukhanya esweni. Ingxenye yalokhu kukhanya kubonakala ngezicubu ezahlukene. Izithombe zakhiwe ngokusekelwe kuloluhlu lokwehlukanisa kwangaphakathi. Imifanekiso ye-OCT kuya cishe ngu-2-3 mm ngaphansi kwezingcubu. Izithombe zitholakala ngokucacile ngefasitela elibonakalayo, njenge-cornea. Ukukhanya okukhishwe esweni kuphephile. Okukhiphayo kuseduze nokukhanya kwe-infrared ngakho akukho ukulimala iso.
Kwenzekani Phakathi ne-OCT?
I-OCT ingase ibe yinto elula kakhulu yokuhlola izithombe zezokwelapha oyoke uthathe. Ukuhlolwa kuthatha imizuzu engaba ngu-5 kuphela ukwenza. Ngemishini eminingi ye-OCT, umane ubeke ikhanda lakho esihlokweni sekhanda. Uchwepheshe uzolungisa ithuluzi. Uzokwaziswa ukuthi ubheke ukukhanya okukhanyayo ngaphakathi komshini. Uchwepheshe uzothola isithombe. Uma abafundi bakho bebancane kakhulu noma uma udokotela efuna isithombe endaweni ekhetheke kakhulu, abafundi bakho bazohlanjululwa ngamaconsi ejoka. Iningi labantu alidingi ukuhlenga.
I-OCT isetshenziswa kakhulu ekuhloleni izimo eziningi zamehlo, kuhlanganise:
- I-Central serous retinopathy
- I-retinopathy yesifo sikashukela
- I-glaucoma
- Ukwehla kwemvelo
- Izimbobo ezinama-macular
- I-pre-retinal macular fibrosis (i-cellophane maculopathy)
I-OCT imelela ezinye zezinguquko zamuva kwezobuchwepheshe ekunakekelweni kwamehlo ezingakhululwa ngezindleko eziphansi kakhulu kumguli.