I-X-ray computed tomography (CT) ishintshe kakhulu izithombe zezokwelapha, inikeza izithombe ezinemininingwane zomzimba womuntu. Okubalulekile ekusebenzeni kahle kwezinhlelo ze-X-ray CT kukhona i-X-ray tube, ekhiqiza ama-X-ray adingekayo ekuthwebuleni izithombe. Intuthuko yakamuva kwezobuchwepheshe yethule ama-variable focus distance detectors (ama-VFDD) ezinhlelweni ze-X-ray CT, okuthuthukisa ikhwalithi yesithombe kanye namakhono okuxilonga. Lesi sihloko sihlola izinzuzo zama-VFDD ezinhlelweni ze-X-ray CT nokuthi asebenzisana kanjani nama-X-ray tubes ukuthuthukisa imiphumela yeziguli.
Ukuqonda ibanga lokuthola ukugxila okuguquguqukayo
I-variable focus detector ibhekisela ekhonweni lesistimu ye-X-ray CT yokulungisa ibanga phakathi kwe-X-ray tube kanye ne-detector. Izinhlelo ze-CT zendabuko zivame ukusebenzisa ukugxila okugxilile, okunciphisa ukuguquguquka kwesithombe kanye nekhwalithi. Ngokusekela ukugxila okuguquguqukayo, izinhlelo ze-CT zesimanje zingathuthukisa inqubo yokuthwebula izithombe ngokusekelwe ezidingweni ezithile zeskeni ngayinye.
Thuthukisa ikhwalithi yesithombe
Enye yezinzuzo eziyinhloko ze-VFDD ezinhlelweni ze-X-ray CT ikhwalithi yesithombe ethuthukisiwe kakhulu. Ngokulungisa ubude be-focal, uhlelo lungathuthukisa ukuxazululwa kwendawo kanye nokuqhathanisa, okuholela ezithombeni ezicacile nezinemininingwane eminingi. Lokhu kuwusizo ikakhulukazi ezindaweni eziyinkimbinkimbi zomzimba, lapho ukuthwebula izithombe okunembile kubalulekile khona ukuze kutholakale ukuxilongwa okunembile. Ishubhu le-X-ray lidlala indima ebalulekile kule nqubo, njengoba lingalinganiswa ngokusekelwe ebude be-focal obulungisiwe ukuze kunikezwe umthamo wemisebe ofanele, ukuqinisekisa ukuthi ikhwalithi yesithombe igcinwa ngaphandle kokubeka engcupheni ukuphepha kwesiguli.
Ukusebenza kahle komthamo okuthuthukisiwe
Enye inzuzo yebanga lokuthola ukugxila okuguquguqukayo ukusebenza kahle komthamo. Ezinhlelweni zendabuko zokugxila okugxilile, umthamo wokukhanya uvame ukufana kungakhathaliseki indawo yokuthwebula izithombe. Lokhu kungabangela ukuchayeka okungadingekile kwezinye izindawo kanye nokuchayeka okuncane kwezinye. Nge-VFDD, ishubhu le-X-ray lingalungisa ukuphuma kwemisebe ngokusekelwe ebangeni elivela kumtholi, okwenza kube lula ukulethwa komthamo okunembe kakhudlwana. Lokhu akugcini nje ngokunciphisa ukuchayeka kwemisebe yesiguli kodwa futhi kuthuthukisa ukuphepha okuphelele kwenqubo yokuthwebula izithombe.
Izinqubo zokuthwebula izithombe eziguquguqukayo kakhudlwana
Ukwethulwa kwe-VFDD kuvumela ukuguquguquka okukhulu kwezinqubo zokuthwebula izithombe. Odokotela bangakwazi ukulungisa ubude bokugxila ngokusekelwe ezidingweni ezithile zesiguli kanye nendawo enesithakazelo. Isibonelo, ubude obude bokugxila bungaba nenzuzo kakhulu lapho kuthwebula izithombe zezingxenye zomzimba ezinkulu, kanti ubude obufushane bokugxila bungase bufaneleke kakhulu ezakhiweni ezincane neziyinkimbinkimbi. Lokhu kuvumelana nezimo kuqinisekisa ukuthi izinhlelo ze-X-ray CT zingakwazi ukuzivumelanisa nezimo ezahlukahlukene zezokwelapha, okwenza zibe ithuluzi eliguquguqukayo lokuthwebula izithombe zokuxilonga.
Ukwakhiwa kabusha kwe-3D okuthuthukisiwe
Ama-variable-focus detectors nawo anegalelo ekuthuthukiseni amakhono okwakha kabusha anezinhlangothi ezintathu (3D). Ngokuthwebula izithombe emabangeni ahlukene agxile, uhlelo lungakhiqiza amamodeli e-3D anembe kakhudlwana ezakhiwo zomzimba. Lokhu kuwusizo kakhulu ekuhleleni kokuhlinzwa nasekuhlolweni kokwelashwa, lapho izithombe ze-3D ezinembile zibalulekile emiphumeleni ephumelelayo. Ukuthembeka kwalokhu kwakhiwa kabusha kuthuthukiswa yikhono le-X-ray lokuhlinzeka ngezithombe ezihambisanayo nezisezingeni eliphezulu emabangeni ahlukahlukene.
Ekuphetheni
Ngamafuphi, ukuhlanganiswa kwe-variable focus distance detectors (VFDDs) ezinhlelweni ze-X-ray CT kumelela intuthuko enkulu kwezobuchwepheshe bokuthwebula izithombe zezokwelapha. Ngokwenza ngcono ubudlelwano phakathi kwe-X-ray tube kanye ne-detector, ama-VFDD athuthukisa ikhwalithi yesithombe, athuthukise ukusebenza kahle komthamo, futhi anikeze ukuguquguquka okukhulu kumaphrothokholi okuthwebula izithombe. Njengoba insimu ye-radiology iqhubeka nokuthuthuka, lokhu kusungula izinto ezintsha ngokungangabazeki kuzoholela emandleni okuxilonga anamandla kakhulu kanye nokunakekelwa kweziguli okuthuthukisiwe. Ikusasa lezinhlelo ze-X-ray CT liqhakazile, futhi ama-VFDD azovula indlela yezixazululo zokuthwebula izithombe ezinembile nezisebenzayo.
Isikhathi sokuthunyelwe: Septhemba 15-2025