Ama-Flat Panel Detactors adlala indima ebalulekile kwi-radiography yedijithali (DR), njengoba ikhwalithi yesithombe sawo ithinta ngqo ukunemba nokusebenza kahle kokuxilongwa. Izinga le-Flat Panel Detector Photoctor izithombe zivame ukukalwa ngumsebenzi wokudlulisa we-modulation (MTF) kanye nokuguqulwa kwe-Quantum (DQE). Okulandelayo ukuhlaziya okuningiliziwe kwalezi zinkomba ezimbili kanye nezici ezithinta i-DQE:
1, umsebenzi wokudlulisa we-modulant (MTF)
Umsebenzi wokudlulisa we-Modation (MTF) yikhono lohlelo lokukhiqiza kabusha uhla lwemvamisa yendawo yento ecatshangelwe. Ibonisa amandla ohlelo lokucabanga ukuhlukanisa imininingwane yesithombe. Uhlelo oluhle lokucabanga ludinga ukukhiqizwa kabusha kwe-100% yemininingwane yento ecatshangelwe, kepha empeleni, ngenxa yezici ezahlukahlukene, inani le-MTF lihlala lingaphansi kwe-1. Okwezinhlelo ze-X-ray zokucabanga zeDijithali, ukuhlola ikhwalithi yabo engokwemvelo, kuyadingeka ukubala i-MTF esetshenzisiwe yangaphambi kwesikhathi engathinteki kahle futhi ifundelwe ohlelweni.
2, Ukuguqulwa kwe-Quantum Conversion (DQE)
Ukusebenza kahle kwe-Quantum (DQE) kuyindlela yokubonisa amandla okuhambisa amasiginali we-imaging system nomsindo kokufaka kokukhipha, okuvezwe njengephesenti. Kukhombisa ukuzwela, umsindo, umthamo we-X-ray Dose, kanye nokuxazululwa kobukhulu be-Flat Panel Detector. Inani eliphakeme le-DQE, amandla okuqina umtshina wokuhlukanisa umehluko ekubuthakathaka kwezicubu.
Izici ezithinta i-DQE
Ukuhlanganiswa kwe-Scintillation Material: Ku-Amorphon Silicon Flat Panel Deteltors, ukuhlanganiswa kwezinto ezibonakalayo ze-scintillation kungenye yezinto ezibalulekile ezithinta i-DQE. Kunezinhlobo ezimbili ezivamile zezinto zokwehla kwe-Scintillator I-Cesium iodide inekhono elinamandla lokuguqula ama-X-ray ku-I-Gadiyan Oxysulfide, kepha ngezindleko eziphakeme. Icubungula i-cesium iodide esakhiweni sekholomu ingaphinde ithuthukise amandla okuthwebula ama-X-rays futhi inciphise ukukhanya okusakazekile. I-Detector ehlanganiswe neGadinium Oxysulfide inesilinganiso esisheshayo sokucabanga, ukusebenza okuzinzile, kanye nezindleko eziphansi, kepha ukusebenza kwayo okuguqukayo, kepha ukusebenza kwayo kokuguqula akuphezulu kwaleyo ye-cesium iodide coating.
AbakwaTranstors: Indlela ukukhanya okubonakalayo okwenziwe yi-scintillators kuguqulwe yaba yizimpawu zikagesi nazo zithinta i-DQE. Kuma-Flat Panel Detactors nge-CESSIUM iodide (noma i-Gadolimium Oxysulfide) + I-Tf Transistor (TFT), uhlu lwama-TFTs lungenziwa lube yi-TFT ngaphandle kokuthi i-lens ngaphandle, ngaphandle kwe-DQE ephakeme. Ku-Amorphous Selenium Flat Panel Deteltors, ukuguqulwa kwama-X-ray ku-generals amasiginali kagesi kuncike ngokuphelele kuma-elektroni umgodi okhiqizwe ungqimba lwe-amorphous Selenium, kanye nezinga le-DQE lincike emandleni wesendlalelo se-amorphous Selenium ukukhiqiza amacala.
Ngaphezu kwalokho, ngohlobo olufanayo lomtshina wephaneli wasesicaba, i-DQE yayo iyahlukahluka ngezinqumo ezihlukile zendawo. I-DQE eyeqile iphakeme, kepha akusho ukuthi i-DQE iphakeme kunoma yisiphi isinqumo sendawo. Ifomula yokubala ye-DQE yile: DQE = S ² × MTF ² / (NPS × x x × c), i-MTF yi-X-ray ukuvezwa amandla, i-C yi-X-Ray Quantum Coeffrenty.
3, Ukuqhathaniswa kwe-amorphous silicon kanye ne-amorphous Selenium Flat Panel Detel
Imiphumela yokulinganisa yezinhlangano zomhlaba wonke ezibonisa ukuthi uma iqhathaniswa ne-Amorphon Silico Flat Panel Detectors, Amorphous Selenium Flat Panel Detectors anamanani amahle e-MTF. Njengoba isixazululo sendawo sokulungiswa, i-MTF ye-Amorphous Silicon Flat Panel Detaictors esheshe yancipha, kanti imichilo ye-Amorphous Selenium Flat Panel ingagcina amanani amahle e-MTF. Lokhu kuhlobene kakhulu nomgomo wokucabanga we-Amorphous Selenium Flat Panel Detoctors aguqula ngokuqondile ama-Photons we-X-ray angenasigameko abe yizimpawu zikagesi. Ama-Amorphous Selenium Flat Panel Detoctors awakhiqizi noma ahlakaze ukukhanya okubonakalayo, ngakho-ke angakwazi ukufezekisa ukulungiswa kwendawo ephezulu kanye nekhwalithi yesithombe esingcono.
Ngamafuphi, ikhwalithi yesithombe yokutholwa kwephaneli yephaneli ithinteka yizici ezahlukahlukene, phakathi kwazo i-MTF ne-DQE ziyizinkomba ezimbili ezibalulekile zokulinganisa. Ukuqonda kanye nokwenza kahle lezi zinkomba nezici ezithinta i-DQE kungasisiza ukuthi sikhethe kangcono futhi sisebenzise izithonjana zephaneli, ngaleyo ndlela sithuthukise ikhwalithi yokucabanga nokunemba kokuxilola.
Isikhathi sePosi: Dec-17-2024