I-X-ray computed tomography (CT) iguqule izithombe zezokwelapha, ihlinzeka ngezithombe ezinemininingwane yezingxenye ezihlukene zomzimba womuntu. Okubalulekile ekusebenzeni kahle kwezinhlelo ze-X-ray CT yithubhu ye-X-ray, ekhiqiza imisebe ye-X edingekayo ukuze kuthathwe izithombe. Intuthuko yakamuva yezobuchwepheshe yethule izithonjana zebanga lokugxila (VFDDs) ezinhlelweni ze-X-ray CT, ezithuthukisa ikhwalithi yesithombe namandla okuxilonga. Lesi sihloko sihlola izinzuzo zama-VFDD ezinhlelweni ze-X-ray CT nokuthi asebenzisana kanjani namashubhu e-X-ray ukuze athuthukise imiphumela yesiguli.
Ukuqonda ibanga le-variable focus detector
Umtshina wokugxila oguquguqukayo ubhekisela ekhonweni lesistimu ye-X-ray CT ukulungisa ngokushintshashintshayo ibanga phakathi kweshubhu le-X-ray nomtshina. Amasistimu e-CT endabuko ngokuvamile asebenzisa ukugxila okugxilile, okukhawulela ukuhlukahluka kwesithombe nekhwalithi. Ngokusekela ukugxila okuguquguqukayo, izinhlelo zesimanje ze-CT zingakwazi ukuthuthukisa inqubo yokuthatha izithombe ngokusekelwe ezidingweni ezithile zokuskena ngakunye.
Thuthukisa ikhwalithi yesithombe
Enye yezinzuzo eziyinhloko ze-VFDD ezinhlelweni ze-X-ray CT ikhwalithi yesithombe ethuthuke kakhulu. Ngokulungisa ubude bokugxila, isistimu ingathuthukisa ukulungiswa kwendawo kanye nokugqama, okuholela ezithombeni ezicacile, ezinemininingwane eyengeziwe. Lokhu kunenzuzo ikakhulukazi ezindaweni eziyinkimbinkimbi ze-anatomical, lapho ukuthwebula okunembayo kubalulekile ekuxilongweni okunembile. Ishubhu ye-X-ray idlala indima ebalulekile kule nqubo, njengoba ingalinganiswa ngokusekelwe kubude obugxilile obulungisiwe ukuze ilethe umthamo ophelele wemisebe, iqinisekise ikhwalithi yesithombe igcinwa ngaphandle kokubeka engcupheni ukuphepha kwesiguli.
Ukusebenza kwesilinganiso esithuthukisiwe
Enye inzuzo yebanga le-variable focus detector ukuthuthukiswa kokusebenza kahle komthamo. Kuzinhlelo zendabuko ezigxilile, umthamo wemisebe uvamise ukufana ngokunganaki indawo yokuthwebula. Lokhu kungaholela ekuchayekeni okungadingekile kwezinye izindawo kanye nokuchayeka kancane kwezinye. Nge-VFDD, ishubhu le-X-ray lingalungisa ukuphuma kwemisebe ngokusekelwe ebangeni elisuka kumtshina, linikeze amandla ukulethwa komthamo onembe kakhudlwana. Lokhu akugcini nje ngokunciphisa ukuchayeka emisebeni yesiguli kodwa futhi kuthuthukisa ukuphepha okuphelele kwenqubo yokuthwebula izithombe.
Amaphrothokholi ezithombe avumelana nezimo
Ukwethulwa kwe-VFDD kuvumela ukuguquguquka okukhulu kumaphrothokholi we-imaging. Odokotela bangalungisa ubude bokugxila ngokusekelwe ezidingweni ezithile zesiguli kanye nendawo enentshisekelo kuyo. Isibonelo, ubude befocal ende bungase bube nenzuzo enkulu lapho uthwebula izingxenye zomzimba ezinkulu, kuyilapho ubude befocal obufushane bungase bufaneleke kakhulu izakhiwo ezincane, eziyinkimbinkimbi. Lokhu kuvumelana nezimo kuqinisekisa ukuthi amasistimu e-X-ray CT angakwazi ukuzivumelanisa nezimo ezihlukahlukene zomtholampilo, okuwenza abe yithuluzi eliguquguqukayo lokuthwebula izithombe zokuxilonga.
Ukwakhiwa kabusha kwe-3D okuthuthukisiwe
Izitholi zokugxilisa okuguquguqukayo nazo zifaka isandla ekwakhiweni kabusha kwamakhono amathathu-ntathu (3D) athuthukisiwe. Ngokuthwebula izithombe kumabanga ahlukene okugxilwe kuwo, isistimu ingakhiqiza amamodeli anembe kakhudlwana e-3D yezakhiwo ze-anatomical. Lokhu kubaluleke kakhulu ekuhleleni ukuhlinzwa nokuhlola ukwelashwa, lapho izithombe ezinembile ze-3D zibalulekile ukuze kube nemiphumela eyimpumelelo. Ukuthembeka kwalokhu kwakhiwa kabusha kuthuthukiswa ikhono leshubhu le-X-ray lokuhlinzeka ngezithombe ezingaguquki, zekhwalithi ephezulu emabangeni ahlukahlukene.
Ekuphetheni
Kafushane, ukuhlanganiswa kwama-variable focus distance detectors (VFDDs) ezinhlelweni ze-X-ray CT kumelela intuthuko enkulu kubuchwepheshe be-imaging yezokwelapha. Ngokuthuthukisa ubudlelwano phakathi kweshubhu le-X-ray nomtshina, ama-VFDD athuthukisa ikhwalithi yesithombe, athuthukise ukusebenza kahle komthamo, futhi anikeze ukuguquguquka okukhulu kumaphrothokholi wokucabanga. Njengoba umkhakha we-radiology uqhubeka nokuthuthuka, lezi zinqubo ezintsha ngokungangabazeki zizoholela emandleni okuxilonga anamandla kanye nokunakekelwa kwesiguli okuthuthukisiwe. Ikusasa lezinhlelo ze-X-ray CT liqhakazile, futhi ama-VFDD azovula indlela yezixazululo zezithombe ezinembayo nezisebenza ngempumelelo.
Isikhathi sokuthumela: Sep-15-2025