Kev siv X {- ray zaj duab xis thiab lub ntsiab lus ntawm nws cov khoom yuav tsum muaj kev nkag siab zoo ntawm cov rhiab. Cov kev tshawb xyuas cov duab thaij duab ntawm zaj duab xis thiab cov hau kev rau ntsuas cov khoom no. Nyob rau hauv nruj me ntsis txhais cov xwm txheej, lub ntom ntom (lossis tsaus ntuj) ntawm cov duab thaij duab yog nyob ntawm qhov kis tau. Kev kis tau yog kev sib xyaw hluav taws xob koob tshuaj cuam tshuam ntawm cov emulsion, uas yog, kev siv (cim kuv (cim t). Hauv cov kev sib tw, kev sib raug zoo ntawm kev sib kis thiab ceev (nws) yog qhia nyob rau hauv thiaj li {6} hu ua cov yam ntxwv curves lossis densitometric nkhaus.
Qhov muag kho qhov muag tsis zoo: Thaum thaij duab zaj duab xis tau muab tso rau ntawm thaj chaw illuminated thiab pom, tus duab zoo li lub siab tawv (naj npawb ntawm cov nyiaj tau los ntawm emulsion. Qhov ceev faj (d) yog txhais raws li lub logarithm rau lub hauv paus 10 ntawm qhov sib piv ntawm qhov teeb meem teeb meem, IO, kom kis tau tus kis los ntawm kev ua yeeb yaj kiab, nws, yog li: d= cav (io} / nws). Kev ceev yog ntsuas siv ib qho Densitometer, raws li tau piav qhia hauv seem hauv qab no. Muaj cov ntsuas hluav taws xob ntsuas ntawm cov yeeb yaj kiab uas npog tau cov kev sib piv ntawm 0 txog 4, sib xws rau ib qho ntawm 10,000.
Sib piv: Cov duab sib piv yog txhais tau tias yog qhov tshwm sim kaj ntawm daim duab thiab keeb kwm nyob ib sab.
Qhov sib piv ntawm ob qhov densities D1 thiab D2 ntawm x- Windows}} Cov duab tshav kub yog qhov sib txawv ntawm lawv thiab feem ntau hu ua "radiological sib piv."
Zaj duab xis sib txawv los yog emulsion sib txawv yog qhov tsis muaj lub sijhawm tsis muaj piav qhia txog qhov ua kom muaj kev sib txawv ntawm zaj duab xis. Thaum cov qauv emulsion emulsion cov duab sib piv feem ntau, zaj yeeb yaj kiab yog hu ua "siab sib txawv" lossis "nyuaj." Txhawm rau ntsuas zaj duab xis sib piv, Lo lus "zaj duab xis gradient" yog siv, nrog lub cim GD. Cov lus qhia tau qhia txog qhov ntom ntom ntawm g yog ntsuas.