The Wright Center for Graduate Medical Education, Scranton, Pennsylvania.
Eberly School of Sciences, Penn-State University, State College, Pennsylvania.
Catheter Cardiovasc Interv. 2021 May 1;97(6):E810-E816. doi: 10.1002/ccd.29223. Epub 2020 Sep 3.
The study evaluated the association between distance from radiation source and radiation exposure.
Radiation exposure during medical procedures is associated with increased risk of cancer and other adverse effects.
An American National Standards Institute phantom was used to study the relationship between measured entrance surface exposure (MESE) and distance from the X-ray source in postero-anterior, left anterior oblique, and right anterior oblique projections. Three distance settings for table height were evaluated with "low" defined as 52 cm, "mid" 66 cm, and "high" 80 cm from the focal point of the X-ray source. Air-kerma and dose-area product measurements were recorded. Operator exposure with each of these conditions was measured, in a short operator (150 cm) as well as in a tall operator (190 cm).
Aggregate results for the three projections were as follows. MESE (μGy/frame) significantly decreased as table-height increases (median, interquartile range, p-value) (low table-height 192.5 [122.4-201.2], mid table-height 105.8 [82.7-115.8], and high table-height 71.7 [58.4-75], p < .0005). The operator exposure (μGy/frame), significantly increased as the table-height increased (low table-height 0.0943 [0.0598-0.1157], medium table-height 0.1128 [0.0919-0.1397], and high table-height 0.158 [0.1339-0.2165], p < .0005). A shorter operator received higher radiation exposure compared to a taller operator (short operator 0.1405 [0.1155-0.1758] and tall operator 0.0995 [0.0798-0.1212], p < .0005).
Increasing table-height is associated with a significant decrease in MESE. Operator radiation exposure increases with increasing table-height and shorter operators receive greater radiation exposure compared to taller operators.
本研究评估了距放射源距离与辐射暴露之间的关系。
医学操作过程中的辐射暴露与癌症和其他不良反应风险增加有关。
使用美国国家标准协会（American National Standards Institute）体模研究了后前位、左前斜位和右前斜位投照中，测量的体表入射剂量（measured entrance surface exposure，MESE）与 X 射线源距离之间的关系。评估了三种台面高度的距离设置，“低”定义为距 X 射线源焦点 52cm，“中”为 66cm，“高”为 80cm。记录空气比释动能和剂量面积产品的测量值。在短操作员（150cm）和高操作员（190cm）中测量了每种条件下的操作员暴露情况。
三种投照的综合结果如下。随着台面高度的增加，MESE（μGy/帧）显著降低（中位数，四分位间距，p 值）（低台面高度 192.5 [122.4-201.2]，中台面高度 105.8 [82.7-115.8]，高台面高度 71.7 [58.4-75]，p<.0005）。随着台面高度的增加，操作员暴露（μGy/帧）显著增加（低台面高度 0.0943 [0.0598-0.1157]，中台面高度 0.1128 [0.0919-0.1397]，高台面高度 0.158 [0.1339-0.2165]，p<.0005）。与高操作员相比，短操作员接受的辐射暴露更高（短操作员 0.1405 [0.1155-0.1758]和高操作员 0.0995 [0.0798-0.1212]，p<.0005）。
增加台面高度与 MESE 显著降低相关。随着台面高度的增加，操作员的辐射暴露增加，与高操作员相比，短操作员接受的辐射暴露更大。
