Kanno I, Miura S, Yamamoto S, Iida H, Murakami M, Takahashi K, Uemura K
J Comput Assist Tomogr. 1985 Sep-Oct;9(5):931-9. doi: 10.1097/00004728-198509000-00017.
A high performance positron emission tomograph, HEADTOME III, with 480 bismuth germanate oxide detectors (13.4 X 25.0 X 40.0 mm), arranged in three rings of 750 mm diameter, with independent shadow masks and septa, is described. Image plane resolution at the center of the field of view (FOV) is 7.9 and 6.5 mm full width at half maximum (FWHM) in low resolution (LR) and high resolution (HR) mode, respectively. Axial resolution is 13.1, 11.3, and 9.1 mm FWHM at the center of FOV for direct planes of low quantitation (LQ), cross planes of LQ, and high quantitation (HQ) mode, respectively. Sensitivities evaluated by true events for a 68Ga 20 cm diameter cyclindrical pool were 34.5 (56.7), 16.4 (27.5), 19.4 and 9.5 kcps (muCi/ml)-1 with the direct (cross) planes of LQLR, direct (cross) planes of LQHR, and direct planes of HQLR and HQHR, respectively. The fraction of scattered coincidence in a cold spot phantom after software correction is 2.5% in LRLQ mode. Count rate linearity after software correction is within 1% up to 50 X 10(3) true events per second per plane with LRLQ mode.
描述了一台高性能正电子发射断层扫描仪HEADTOME III，它配备480个锗酸铋探测器（13.4×25.0×40.0毫米），排列在三个直径750毫米的环中，带有独立的准直器和隔板。在低分辨率（LR）和高分辨率（HR）模式下，视野（FOV）中心的图像平面分辨率分别为半高宽（FWHM）7.9毫米和6.5毫米。对于低定量（LQ）直接平面、LQ交叉平面和高定量（HQ）模式，在FOV中心的轴向分辨率分别为FWHM 13.1毫米、11.3毫米和9.1毫米。对于直径20厘米的68Ga圆柱形水池，通过真事件评估的灵敏度分别为：LQ-LR直接（交叉）平面为34.5（56.7）kcps（μCi/ml）-1，LQ-HR直接（交叉）平面为16.4（27.5）kcps（μCi/ml）-1，HQ-LR和HQ-HR直接平面分别为19.4和9.5 kcps（μCi/ml）-1。在LRLQ模式下软件校正后，冷点模型中散射符合事件的比例为2.5%。在LRLQ模式下，软件校正后的计数率线性在每秒每平面高达50×10(3)个真事件时在1%以内。
