(Animal Rotating Positron Emission Tomography， AROPET) 0 ARO-PET系統有5.04 cm X4.48 cm的照野車色固 (field of view) ，可以做小動物實驗的正子造彩。系統以條列模式(listmode)儲存數據，對影像前直處理與影像 重建等程序與處理方法均可彈性異動，所以相當適合做為研究用機種。ARO-PET系統具有二維平面投影及三維斷層兩種成像功能。二維平面投影成像無需旋轉偵檢器，功能類似加馬攝影機，可獲得二維的平面投影影像。此成像模式可應用於分析示蹤藥物在體內分佈的特性。三維斷層成像模式可獲得三十一個橫切面斷層影像，此模式類似一般的環式PET系統，惟偵檢器數目較少，需轉動90。才可完成掃描。本文介紹ARO-PET系統(含偵檢器、數據擷取、成像處理)的研製及系統空間解析度的測試結果，此外假體實驗與動物實驗的結果亦將在文內討論。

A Rotating Positron Emission Tomography (ARO-PET) scanner with 2.73 mm spatial resolution was developed at the Physics Division， the Institute of Nuclear Energy Research. The field of view of this system is 5.04 cm x4.48 cm， which is fit for imaging small animals. The list-mode data storage for flexible pre- and post-reconstruction processes is suitable for research requirements also. By ARO-PET， animals can be imaged in two modes. One is similar to a gamma camera in which the detectors do not need to rotate and a 2-D planar projection imaging is obtained. This mode is used for the initial characterization of bio-distribution of tracers. For the tomographic mode， the detectors are rotated through 90°; thirty-one tomographic images can be obtained. This mode resembles a conventional 3-D PET scan using a partial detector ring. The development of the ARO-PET system (including detectors， data acquisition， imaging) and the spatial resolution performance are described in this paper. The results of the phantom tests and animal tests are presented also