X RAY:X-ray lub hauv paus ntsiab lus ntawm kev ntsuam xyuas yog nkag mus rau tib neeg lub cev, raws li lub cev sib txawv thiab qhov sib txawv ntawm tib neeg lub cev, X-ray yuav muaj ntau theem ntawm attenuation, tsim cov xim dub thiab dawb sib txawv hauv daim duab. Yog li ntawd, qhov contour thiab ntom ntawm lub cev tuaj yeem txiav txim siab los ntawm kev kos duab.
CT:Lub hauv paus ntsiab lus ntawm kev soj ntsuam CT yog qhov paub daws teeb meem, tej zaum yuav qhia txhua leej txhua tus rau kev suav tomography (CT) yog siv x hlau hlua, theem ntawm qhov tuab ntawm qhov chaw soj ntsuam yuav tsum tau muab tshuaj ntsuam xyuas rau tib neeg lub cev, los ntawm lub tshuab kuaj pom los ntawm qib. X-ray tom qab hloov mus rau pom lub teeb los ntawm photoelectric converter rau hauv hluav taws xob cov teeb liab, ces los ntawm cov analog rau digital converter, hloov mus rau cov teeb liab digital, input computer ua, duab tsim ua raws li qib xaiv, muab faib ua ntau lub duab plaub tib qhov loj me, hu ua voxel, luam theej duab cov ntaub ntawv tau los ntawm kev suav rau txhua tus neeg lub hauv paus ntawm X-ray, attenuation coefficient thiab absorption coefficient, thiab tom qab ntawd muab tso rau hauv matrix, uas yog digital matrix, digital matrix, tuaj yeem khaws cia rau hauv disk lossis CD. Los ntawm digital mus rau analog converter, cov matrix digital ntawm txhua tus lej, CT duab tau hloov mus rau hauv cov xim dub rau dawb, cov squares me me ntawm cov nplai grey sib txawv, uas yog pixe ls, teem nyob rau hauv ib tug matrix.
B ultrasound:Tsis muaj hluav taws xob, tab sis lub hauv paus ntsiab lus ntawm kev nkag mus ntawm B ultrasound tsis muaj zog nrog ultrasound.Penetrating tib neeg lub cev, thaum lub suab yoj raws li tib neeg cov ntaub so ntswg yuav tsim yoj yoj, los ntawm kev xam cov reflected yoj duab.
MRI:Koj tuaj yeem txiav cov khaubncaws sab nraud povtseg ntawm txhua lub kaum sab xis yam tsis muaj hluav taws xob.Lub cev nqaij daim tawv thiab qhov txhab ntawm lub hlwb, qaum thiab qaum qaum yog zoo dua li CT.MRI txoj kev loj hlob tsuas yog sib npaug rau co cov dej molecules kom vibrate, ces calming down thiab hnov lub vibrations sab hauv. , MRI kuj tseem hu ua kev kuaj wobbly.
