Intensifying screens are used in the x-ray cassette to intensify the effect of the x-ray photon by produce a lot of light photons. Nws txo qis MAS yuav tsum tau ua ib qho tuab thiab li no txo qis tus neeg mob dose loj heev.
Lub hom phiaj ntawm kev ua kom lub vijtsam yog dab tsi?
Intensifying cov ntxaij vab tshaus yog siv kom luv lub sij hawm raug thiab, qee lub sij hawm, ua kom cov duab sib piv. Xav tias roentgen hluav taws xob tau pom los ntawm nws qhov kev ua fluorescent (ntawm barium plati- nocyanide), nws tsis yog qhov txawv txav uas roentgen kuaj pom sai sai pom kev siv rau cov ntxaij vab tshaus.
Lub vijtsam ua kom muaj zog yog dab tsi yog nws tsim los ntawm?
Ib qho tshuaj tiv thaiv muaj zog muaj txheej tiv thaiv, txheej phosphor, txheej hauv qab, thiab txheej txheej(Fig. 1-32). Cov txheej tiv thaiv sab nrauv pab txo qhov kev puas tsuaj ntawm cov txheej phosphor rhiab heev. Cov txheej phosphor yog txheej txheej txheej txheej txheej ntawm lub vijtsam.
Tus lej twg yuav qhia qhov screen qeeb tshaj plaws?
Cov ntxaij vab tshaus siab ceev tau ntsuas 400 nrawm lossis ntau dua, txhais tau tias lawv yog 400 zaug "ceev dua", lossis ntau dua hauv kev tsim lub teeb dua li tsis muaj lub vijtsam; nruab nrab ceev tshuab tau ntsuas ntawm 200 thiab cov ntxaij vab tshaus qeeb yog 100 lossis tsawg dua.
Yuav ua li cas qhov sib xws ntawm kev siv tshuaj ntsuam yuav cuam tshuam rau cov duab tsim?
Lub thickness ntawm ibintensifying screen yog hais txog 0.4 mm. Lub thickness ntawm lub vijtsam cuam tshuam rau lub vijtsam nrawm thiab qhov kev daws teeb meem spatial: thicker npo txhim kho nrawmtab sis txo qhov kev daws teeb meem spatial (nce diffusion ntawm lub teeb ua ntej tsim duab).
