| 单词 | Tomography,Emission-Computed,Single-Photon |
| 释义 | Tomography,Emission-Computed,Single-Photon《英文msh词典》Tomography,Emission-Computed,Single-Photon [主题词] Tomography,Emission-Computed,Single-Photon [同义词] Radionuclide Tomography,Single-Photon Emission-Computed [同义词] SPECT [同义词] Single-Photon Emission-Computed Tomography [同义词] Tomography,Single-Photon,Emission-Computed [入口词] Emission-Computed Tomography,Single-Photon [入口词] Radionuclide Tomography,Single Photon Emission Computed [入口词] Single Photon Emission Computed Tomography [入口词] Tomography,Single-Photon Emission-Computed [中文释义] 体层摄影术,发射型计算机,单光子 [英文释义] A method of computed tomography that uses radionuclides which emit a single photon of a given energy. The camera is rotated 180 or 360 degrees around the patient to capture images at multiple positions along the arc. The computer is then used to reconstruct the transaxial,sagittal,and coronal images from the 3-dimensional distribution of radionuclides in the organ. The advantages of SPECT are that it can be used to observe biochemical and physiological processes as well as size and volume of the organ. The disadvantage is that,unlike positron-emission tomography where the positron-electron annihilation results in the emission of 2 photons at 180 degrees from each other,SPECT requires physical collimation to line up the photons,which results in the loss of many available photons and hence degrades the image. |
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