Kodi pitch mu CT ndi chiyani?
Kodi pitch mu CT ndi chiyani?
Anonim

(p) Ndi phula (mu computed tomography) ndi chiŵerengero cha kuchuluka kwa tebulo la odwala mpaka kukula kwa mtengo wonse kwadzina la CT sikani. The phula factor imagwirizana ndi liwiro la kuphimba kwa voliyumu ku magawo a thinnest omwe amatha kumangidwanso. Phokoso = kusuntha kwa tebulo pozungulira / kugundana kwagawo.

Chifukwa chake, helical pitch ndi chiyani?

Mphamvu ya Helical ndi muyeso wa mtunda woyima (ogwirizana ndi helical axis) kulekanitsa mfundo ziwiri pa a helix pambuyo pa "kutembenuka" kokwanira (kutengera 2pi radians) [1]. The phula pafupifupi 3.6-helix (alpha helix ndi zotsalira 3.6 pa "kutembenuka") pafupifupi 5.4 angstroms [2].

Kupatula pamwambapa, makulidwe a magawo mu CT ndi chiyani? Kagawo makulidwe ndi kagawo increment ndi mfundo zapakati zomwe zimazungulira CT/ Kujambula kwa MRI. Kagawo makulidwe amatanthauza (nthawi zambiri axial) kusamvana kwa sikani (2 mm mu fanizo). Kagawo Kuwonjezeka kumatanthauza kuyenda kwa tebulo/sikani kuti mufufuze chotsatira kagawo (kuchokera ku 1 mm mpaka 4 mm mu fanizo).

Pambuyo pake, wina angafunsenso, kodi phula limawerengedwa bwanji mu CT?

Chigawo chimodzi CT (SSCT) Mawu akuti detector phula imagwiritsidwa ntchito ndipo imatanthauzidwa ngati mtunda wa tebulo womwe umayenda munjira imodzi ya 360 ° gantry yogawidwa ndi kuwombana kwamitengo. 2. Mwachitsanzo, ngati tebulo anayenda 5 mamilimita mu kasinthasintha mmodzi ndi mtengo kugundana anali 5 mm ndiye phula 5 mm / 5 mm = 1.0.

Kodi Sinogram mu CT ndi chiyani?

A sinogram ndi njira yapadera ya x-ray yomwe imachitika kuti muwone m'maganizo kutseguka kulikonse kwachilendo (sinus) m'thupi, kutsatira kubayidwa kwamitundu yosiyanasiyana (utoto wa x-ray) potsegula. Palibe zoletsa zakudya pamaso a sinogram.

Yotchuka ndi mutu