Sezvo isu tose tinoziva kuti kujekesa kwemufananidzo we ultrasound kunotarisa kana kuongorora kwedu kwakarurama, Pamusoro pekushanda kwemuchina, isu tine dzimwe nzira dzekuvandudza kujekesa kwechifananidzo.
Mukuwedzera kune zvatakataura munyaya yapfuura, zvinotevera zvinokanganisa mifananidzo ye ultrasound.
1. Chisarudzo
Pane matatu makuru magadzirirwo e ultrasound: kugadziriswa kwenzvimbo, kugadzirisa nguva, uye kusiyanisa kugadzirisa.
● Kugadziriswa kwenzvimbo
Spatial resolution ndiko kugona kwe ultrasound kusiyanisa mapoinzi maviri pahupamhi chaihwo, akakamurwa kuita axial resolution uye lateral resolution.
Axial resolution kugona kusiyanisa pakati pemapoinzi maviri munzira inofambirana neiyo ultrasound beam (longitudinal), uye inoenzana neiyo transducer frequency.
Kugadziriswa kweaxial ye-high-frequency probe yakakwirira, asi panguva imwe chete kuderedzwa kwezwi rinonzwika munyama yakakurawo, izvo zvinozoita kuti pave nepamusoro axial kugadziriswa kwechimiro chisina kudzika, nepo axial kugadziriswa kwepakadzika. chimiro chakaderera, saka ndinoda kuvandudza Axial resolution yezvimiro zvakadzika, kungave nekuunza ma-high-frequency transducers padhuze nechinangwa (eg, transesophageal echocardiography) kana nekuchinja kune yakaderera-frequency transducers.Ndosaka zvichikurudzirwa kushandisa ma-high-frequency probes epamusoro-soro tishu ultrasound uye yakaderera-frequency probes kune yakadzika tishu ultrasound.
Lateral resolution ndiko kugona kusiyanisa mapoinzi maviri perpendicular kune kutungamira kweiyo ultrasonic beam (yakatwasuka).Pamusoro pekuenzana nekuwanda kweiyo probe, zvakare yakabatana zvakanyanya nekumisikidza kwekutarisa.Iyo hupamhi hweiyo ultrasonic beam ndiyo yakamanikana munzvimbo yekutarisa, saka Lateral resolution ndiyo yakanakisa pakutarisa.Pamusoro tinogona kuona kuti kuwanda uye kutarisisa kweprobe kunoenderana zvakanyanya nekugadziriswa kwenzvimbo ye ultrasound.1
Mufananidzo 1
● Chisarudzo chenguva
Temporal resolution, inozivikanwawo seye frame rate, inoreva huwandu hwemafuremu pasekondi yekufungidzira.Ultrasound inotapurirwa nenzira yemapulses, uye iyo inotevera pulse inogona kutapurirwa chete mushure mekunge pulse yapfuura yadzokera kune ultrasound probe.
Kugadziriswa kwenguva kwakabatana zvisina kunaka nekudzika uye huwandu hwenzvimbo dzakatariswa.Iyo yakakura kudzika uye yakanyanya kutarisisa nzvimbo, inodzika iyo pulse repetition frequency uye yakaderera furemu rate.Iyo inononoka yekufungidzira, iyo shoma ruzivo rwakatorwa munguva pfupi.Kazhinji kana furemu chiyero chiri pazasi 24 mafuremu/s, mufananidzo unopenya.
Panguva yekuvhiyiwa kweanesthesia yekiriniki, apo tsono inofamba nekukurumidza kana kuti mushonga wakabaiwa nekukurumidza, iyo yakaderera furemu rate inokonzeresa mapikicha asina kujeka, saka kugadzirisa kwechinguva kwakakosha pakuonekwa kwetsono panguva yekubaya.
Contrast resolution inoreva diki grey chiyero musiyano unogona kusiyanisa chiridzwa.Dynamic range yakanyatsoenderana nekugadzirisa mutsauko, iyo yakakura iyo ine simba renji, iyo yakaderera mutsauko, inotsvedzerera mufananidzo, uye yakakwirira kugona kuziva maviri maviri akafanana matishu kana zvinhu (Mufananidzo 2).
Mufananidzo 2
2.Frequency
Frequency inoenderana zvakananga nekugadziriswa kwenzvimbo uye inversely proportional kune ultrasound kupinda (Mufananidzo 3).Yakakwirira frequency, pfupi wavelength, hombe attenuation, kusapinda zvakanaka, uye yakakwirira spatial resolution.
Mufananidzo 3
Mubasa rekiriniki, zvinonangwa zvemaoparesheni mazhinji ndezvepamusoro, saka high-frequency linear array probes inogona kusangana nezvinodiwa zvemazuva ese zvechiremba, asi kana uchinge wasangana nevarwere vakafuta kana zvakadzika zvinangwa (senge lumbar plexus), A low frequency convex array. kuongorora kunokosha zvakare.
Mazhinji ezvino ultrasonic probes ndeye Broadband, inova hwaro hwekuona frequency kutendeuka tekinoroji.Frequency conversion inoreva kuti kuwanda kwekushanda kweprobe kunogona kuchinjwa kana uchishandisa probe imwechete.Kana chinangwa chiri chepamusoro, sarudza frequency yakakwirira;kana chinangwa chakadzika, sarudza yakaderera frequency.
Kutora Sonosite ultrasound semuenzaniso, iyo frequency kutendeuka kwayo ine 3 modes, iyo Res (chisarudzo, ichapa yakanakisa kugadzirisa), Gen (general, ichapa yakanakisa chiyero pakati pekugadzirisa uye kupinda), Peni (kupinza, ichapa yakanakisa kupinda. )Nokudaro, mubasa chairo, rinoda kugadziriswa maererano nekudzika kwenzvimbo inotarirwa.
Nguva yekutumira: Jul-10-2023
