Muaj ntau hom kev kuaj mob acoustic, uas feem ntau tuaj yeem faib ua hom A, hom B, hom D, thiab hom M. Nyob rau tam sim no, peb qhov kev kuaj mob ua ntej (ultrasound) feem ntau ua ke nrog ntau hom. Ob leeg A-ultrasound thiab M-ultrasound yog ib qho kev ntsuas ib qho. Ntxiv nrog rau nws cov ntawv thov hauv ophthalmology, A-ultrasound tau raug tshem tawm nyob hauv lwm daim teb. M-ultrasound yog siv rau kev mob plawv ultrasound.
B-hom ultrasound yog lub hauv paus ntawm txhua qhov kev kuaj mob ultrasound tam sim no. Nws tuaj yeem ncaj qha qhia ob-seem ntawm cov duab, yog li nws tseem hu ua ob-kab hluav taws xob ultrasound. D-hom ultrasound tseem hu ua Doppler hom. Doppler zaus ua haujlwm teeb liab ntawm cov ntshav txaus thiab cov haujlwm hauv lub cev yog superimposed ntawm ob daim duab ntawm B-hom ultrasound tom qab ua tiav los ntawm kev siv tshuab-kho cov tshuab thiab xim coding. Qhov no yog lub ntsiab lus dav dav Xim Doppler ultrasound. Coob leej xav tias xim Doppler ultrasound yog xim TV. Txhua tus duab koj pom yuav tsum yog xim. Txawm li cas los xij, xim Doppler ultrasound yog los ntawm tsis muaj txhais tau tias cov xim puv npo. Tsuas yog thaum pom cov cim ntshav ntws, nws yuav pom ib nrab liab lossis xiav. Yog li no, xim Doppler ultrasound tuaj yeem muab tsis tau tsuas yog cov ntaub ntawv morphological ntawm ob lub duab, tab sis kuj muaj cov ntaub ntawv hemodynamic, uas yog cov ntsiab ntawm cov kev kuaj mob niaj hnub no.
