I-Bone densitometer iyithuluzi lokuhlola lezokwelapha elikala amaminerali amathambo omuntu futhi lithole idatha ehlobene ehlukahlukene.Ama-densitometer amathambo ajwayelekile emakethe ekuqaleni kwekhulu lama-21 ahlukaniswe izigaba ezimbili: i-dual-energy X-ray absorptiometry kanye ne-ultrasonic absorptiometry.I-Dual-energy X-ray absorptiometry I-X-ray absorptiometry ithola izinhlobo ezimbili zamandla, okuyiziqongo ze-photon ezinamandla amancane nezinamandla amakhulu, ngomshini othile ngeshubhu le-X-ray.Ngemuva kokuthi isiqongo se-photon singene emzimbeni, isistimu yokuskena ithumela isignali eyamukelwe kukhompyutha ukuze icutshungulwe idatha ukuze ithole okuqukethwe kwamaminerali amathambo.Ithuluzi lingakala isisindo samathambo kunoma iyiphi ingxenye yomzimba ngokunemba okuphezulu kanye nokulimala okuncane emzimbeni womuntu.Umthamo wemisebe wokuthola ingxenye ulingana no-1/30 we-X-ray yesifuba kanye no-1% we-CT.Ayikho inkinga yokubola komthombo okhipha imisebe, futhi iye yathuthukiswa kancane kancane emadolobheni amakhulu eChina, futhi amathemba ayathembisa.
I-dual-energy X-ray absorptiometry system iqukethe ishubhu le-X-ray, i-collimator, nomtshina we-X-ray.Ama-photon e-X-ray akhiqizwa ishubhu ye-X-ray, equkethe i-cathode ne-anode, evalwe epayipini le-vacuum.Cishe u-99% wamandla eshubhu le-X-ray achithwa njengokushisa, futhi angaphansi kuka-1% wamandla abe ama-X ray.I-X-ray beam ihlanganiswa ibe yinduku emincane emise okwefeni ngaphambi kokuba ifike endaweni elinganiswayo.I-collimator isetshenziselwa ukulawula nokucindezela inkambu ye-irradiation ye-imaging beam ukuze kuqinisekiswe ukuthi i-beam ingakwazi ukumboza ngokunembile indawo yokuthwebula ephumelelayo yomtshina.I-X-ray beam idlula endaweni yesihloko bese ikhethwa ngokukhetha ithambo nezicubu ezithambile kuleyo ndawo.Lapho i-X-ray beam idlula esigulini, ishaya umtshina we-X-ray, futhi ukuqina kwemisebe ngemva kokudlula emzimbeni kuguqulwa kube amasignali kagesi futhi kuqoshwe.
Umtshina we-Whale3025/1613 owuchungechunge olushukumisayo lwephaneli eliyisicaba elithuthukiswe ngokuzimela ngu-Haobo usebenzisa ubuchwepheshe bezinto ezibonakalayo ze-amorphous silicon (a-Si), obunezici zekhwalithi ephezulu yesithombe, ububanzi obuguquguqukayo obukhulu kanye nohlu olubanzi lwezinhlelo zokusebenza zetheminali.Inamagiya okulungisa alawulwa izinhlelo eziningi, angakwazi nje kuphela ukuhlangabezana nezidingo zohlelo lokusebenza oluzwela kakhulu, kodwa futhi ahlangabezane nezidingo zezimo ezinkulu zobubanzi obuguquguqukayo, futhi angavumelaniswa kabanzi nezidingo zohlelo lokusebenza zokutholwa kwezokwelapha.
Izincomo zomkhiqizo wehadiwe
Isikhathi sokuthumela: Jul-14-2022