Steyn Phillip F, Uhrig John
Department of Environmental and Radiological Health Sciences, Colorado State University, 300 W Drake, Fort Collins, CO 80523, USA.
Vet Radiol Ultrasound. 2005 Nov-Dec;46(6):529-32. doi: 10.1111/j.1740-8261.2005.00097.x.
Bone scintigraphy is often used in horses because of its sensitivity and noninvasive nature. A 99mTc labeled radiopharmaceutical is injected at a dose of between 5.7 and 7.3GBq. Images are acquired immediately postinjection and 2-4h post. People are often in the room with the horse during the acquisition process. Objectives of this study were to (a) document the radiation exposure rates at different distances from various sites of the horse at varying times post injection and (b) study the usefulness of wearing lead aprons to reduce exposure rates to personnel. Radiation exposure rates were measured in at three distances (at skin surface and at 30 and 100 cm from the skin) from three sites (shoulder, thorax, and pelvis) in 19 horses. Exposure rates were measured with and without shielding by a 0.5-mm lead equivalent apron during both the pool and delayed phases. A 0.5mm equivalent lead apron significantly decreases radiation exposure (P<0.05) at these three distances from the three sites during both image acquisition phases. Mean dose reduction factors from the lead apron range from 3.6 to 5.7.
由于骨闪烁显像具有敏感性和非侵入性，因此常用于马匹。注射剂量为5.7至7.3GBq的99mTc标记放射性药物。在注射后立即以及注射后2 - 4小时采集图像。在采集过程中，人员通常会在马匹所在的房间内。本研究的目的是：（a）记录注射后不同时间从马的不同部位起不同距离处的辐射暴露率，以及（b）研究佩戴铅围裙对降低人员暴露率的有效性。在19匹马中，从三个部位（肩部、胸部和骨盆）在三个距离（皮肤表面以及距皮肤30和100厘米处）测量辐射暴露率。在静息期和延迟期，分别在有和没有0.5毫米铅当量围裙屏蔽的情况下测量暴露率。在两个图像采集阶段，0.5毫米当量铅围裙在这三个部位的这三个距离处均显著降低了辐射暴露（P<0.05）。铅围裙的平均剂量降低系数在3.6至5.7之间。
