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A typical patient scan on the Discovery ST scanner begins with a scout scan that is used for defining the tomographic scan range. Helical CT is then performed. As the ct images become available , they are automatically processed foe use as PET attenuation conrection data. CT attenuation correction is performed by... 顯示更多 A typical patient scan on the Discovery ST scanner begins with a scout scan that is used for defining the tomographic scan range. Helical CT is then performed. As the ct images become available , they are automatically processed foe use as PET attenuation conrection data. CT attenuation correction is performed by first converting the CT Hounsfield units to 511-keV attenuation coefficients with a trilinear lookup table. The CT attenuation image is then blurred to match the PET system’s resolution characteristics and is then forward projected into sonogram space for application during the reconstruction process . Upon completion of the helical scan the PET acquisition can be initiated. As each FOV of the PET scan is completed , the reconstruction will automatically proceed with user-defined prescriptions. Therefore, the full PET image volume is available for review shortly after the scan completes. Automatic networking of PET and CT data is supported to remote review workstations and picture archiving and communication systems.

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Discovery ST scanner (GE所出品的正子電腦斷層攝影儀)對病患典型的掃描作業是先以偵查掃描 (scout scan) 開始；偵查掃描的目的是定義斷層掃描範圍。接者就是進行快速螺旋電腦斷層檢查(Helical CT)。 當電腦斷層(CT)的影像產出後，就自動被處理作為正子放射斷層掃描儀(PET)所用到的衰減校正資料(attenuation correction data) 電腦斷層衰減校正是先對照一個"三線對照表" (trilinear lookup table)，將CT Hounsfield 單位轉換成511-keV 的衰減係數(Attenuation coefficients)。如此一來，衰減後電腦斷層影像才能被模糊化( 即解析度降低 ) 至能符合正子放射斷層掃描儀系統(所能處理)的影像解析度特性。而且再進一步的被投射至超音波空間 (sonogram space)，以使用於(影像)重新建構的過程。 在完成 快速螺旋電腦斷層之後，正子放射斷層掃描儀接者可以開始影像擷取。當正子掃描儀每個視角(FOV, Field Of View)的掃描作業完畢，(影像)重新建構將根據使用者所定義的規定，自動處理。 因此當掃描作業完成， 所有影像的集合可即刻被檢閱。電腦斷層攝影儀和正子放射斷層掃描儀的網路自動化，可以支援在遠端的(影像)檢閱工作站、影像儲存庫和通訊等系統。

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