Christian P E, Moore J G, Sorenson J A, Coleman R E, Weich D M
J Nucl Med. 1980 Sep;21(9):883-5.
Geometric-mean correction of gastric radioactivity can be used to correct for the distribution, depth, and attenuation of the radionuclide. Anterior image counts were compared with the geometric mean of anterior and posterior counts, using a computer-assisted gamma camera. Phantom and human studies using Tc-99m and In-111 were used to evaluate the difference between anterior-only and geometric-mean data. The effect of meal size on gastric emptying was studied using Tc-99m and In-111 simultaneously as solid-phase and liquid-phase markers. Differences between the anterior data and AP-PA data corrected by geometic mean were compared in ten healthy male subjects. The average half-emptying times for solid food, with 1692-, 900-, and 300-g meals, were 277, 146, and 77 min, respectively. Average half-emptying times for liquid were 178, 81, and 38 min for the same meals.
胃放射性的几何平均校正可用于校正放射性核素的分布、深度和衰减。使用计算机辅助γ相机，将前位图像计数与前位和后位计数的几何平均值进行比较。使用锝-99m和铟-111进行的体模和人体研究用于评估仅前位数据与几何平均数据之间的差异。同时使用锝-99m和铟-111作为固相和液相标记物，研究餐量对胃排空的影响。比较了10名健康男性受试者的前位数据与经几何平均校正的前后位数据之间的差异。固体食物在餐量为1692克、900克和300克时的平均半排空时间分别为277分钟、146分钟和77分钟。相同餐量的液体平均半排空时间分别为178分钟、81分钟和38分钟。
