Bone densitometer ndi chida choyesera chachipatala chomwe chimayesa mchere wa mafupa aumunthu ndikupeza zambiri zokhudzana nazo.Ma densitometer a fupa omwe amapezeka pamsika kumayambiriro kwa zaka za zana la 21 adagawidwa m'magulu awiri: mphamvu ziwiri za X-ray absorptiometry ndi ultrasonic absorptiometry.Mphamvu ziwiri za X-ray absorptiometry X-ray absorptiometry imapeza mitundu iwiri ya mphamvu, nsonga za photon zotsika mphamvu komanso zamphamvu kwambiri, kudzera pa chipangizo china kudzera mu chubu cha X-ray.Pambuyo pa chithunzi cha photon chimalowa m'thupi, makina ojambulira amatumiza chizindikiro cholandirira ku kompyuta kuti akonze deta kuti apeze fupa la mchere.Chidacho chimatha kuyeza mafupa m'mbali iliyonse ya thupi molondola kwambiri komanso kuvulaza thupi la munthu.Mlingo wa radiation wozindikira gawo ndi wofanana ndi 1/30 ya X-ray pachifuwa ndi 1% ya CT.Palibe vuto la kuwonongeka kwa magwero a radioactive, ndipo lapangidwa pang’onopang’ono m’mizinda ikuluikulu ya ku China, ndipo ziyembekezo zikudzadi.
Dongosolo la mphamvu ziwiri za X-ray absorptiometry lili ndi chubu cha X-ray, collimator, ndi chowunikira cha X-ray.Zithunzi za X-ray zimapangidwa ndi chubu cha X-ray, chomwe chili ndi cathode ndi anode, zomwe zimatsekedwa mu chubu cha vacuum.Pafupifupi 99% ya mphamvu ya X-ray chubu imatayidwa ngati kutentha, ndipo mphamvu zosakwana 1% zimakhala X-ray.Mtengo wa X-ray umakulungidwa kukhala mtengo wopapatiza wooneka ngati fan usanafike pamalo omwe akuyezedwa.Collimator imagwiritsidwa ntchito poyang'anira ndi kukakamiza malo owunikira a mtengo wojambula kuti awonetsetse kuti mtengowo ukhoza kuphimba molondola malo owonetsera bwino a detector.Mtsinje wa X-ray umadutsa m'derali ndipo umasankhidwa mosankhidwa ndi fupa ndi minofu yofewa m'deralo.Pamene mtanda wa X-ray umadutsa mwa wodwalayo, umagunda chowunikira cha X-ray, ndipo mphamvu ya kuwala ikadutsa m'thupi imasandulika kukhala zizindikiro zamagetsi ndikujambulidwa.
Whale3025/1613 mndandanda wa dynamic flat panel detector wodziyimira pawokha ndi Haobo umatenga ukadaulo wa amorphous silicon (a-Si), womwe uli ndi mawonekedwe apamwamba kwambiri, mawonekedwe akulu osinthika komanso mitundu ingapo yamapulogalamu.Ili ndi zida zosinthira zomwe zimayendetsedwa ndi mapulogalamu ambiri, zomwe sizingangokwaniritsa zofunikira pakukhudzidwa kwakukulu, komanso zimakwaniritsa zofunikira pazochitika zazikulu zamitundu yosiyanasiyana, ndipo zimatha kusinthidwa mosiyanasiyana malinga ndi zofunikira zachipatala.
Malingaliro azinthu za Hardware
Nthawi yotumiza: Jul-14-2022