HIGH-RESOLUTION COMPUTED TOMOGRAPHY OF POSITRON EMITTERS
HIGH-RESOLUTION COMPUTED TOMOGRAPHY OF POSITRON EMITTERS
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DOI：
10.1109/tns.1977.4328738
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发表时间：
1977-01-01
影响因子：
1.8
通讯作者：
JACKSON, HG
中科院分区：
文献类型：
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作者：
DERENZO, SE;BUDINGER, TF;JACKSON, HG
高分辨率的计算机跨轴断层扫描已经在含有正电子发射同位素的幻影上进行了。成像系统由两组相对的8个8mm × 30mm × 50mm深的NaI（T1）晶体组成，并旋转幻影沿8960投影积分测量重合事件，因为它们将被正在建造的280晶体环系统测量。重建图像的空间分辨率在环中心为7.5 mm FWHM，在半径为10 cm处约为11 mm FWHM。我们提出了在各种操作条件下的成像和背景速率的测量。基于这些测量，完整的280晶体系统将以400 #x003BC每秒成像10,000个事件；Ci在1厘米厚，直径20厘米的截面上。我们发现，150万次事件足以可靠地成像3.5毫米的热点，中心到中心间距为14毫米，在直径为15-20厘米的幻影中孤立的9毫米直径的冷点。
High resolution computed transaxial tomography has been performed on phantoms containing positron-emitting isotopes. The imaging system consisted of two opposing groups of eight NaI(T1) crystals 8 mm × 30 mm × 50 mm deep and the phantoms were rotated to measure coincident events along 8960 projection integrals as they would be measured by a 280 crystal ring system now under construction. The spatial resolution in the reconstructed images is 7.5 mm FWHM at the center of the ring and approximately 11 mm FWHM at a radius of 10 cm. We present measurements of imaging and background rates under various operating conditions. Based on these measurements, the full 280 crystal system will image 10,000 events per sec with 400 #x003BC;Ci in a section 1 cm thick and 20 cm in diameter. We show that 1.5 million events are sufficient to reliably image 3.5 mm hot spots with 14 mm center-to-center spacing and isolated 9 mm diameter cold spots in phantoms 15-20 cm in diameter.