Alrehily F, Hogg P, Twiste M, Johansen S, Tootell A
College of Applied Medical Sciences, Taibah University, Medina, 42353, Saudi Arabia; School of Health Sciences, University of Salford, Salford, M5 4WT, United Kingdom.
School of Health Sciences, University of Salford, Salford, M5 4WT, United Kingdom.
Radiography (Lond). 2019 Aug;25(3):e68-e74. doi: 10.1016/j.radi.2019.02.005. Epub 2019 Feb 19.
Scoliosis is defined as a deformity of the spine with lateral curvature in the coronal plane. It requires regular X-ray imaging to monitor the progress of the disorder, therefore scoliotic patients are frequently exposed to radiation. It is important to lower the risk from these exposures for young patients. The aim of this work is to compare organ dose (OD) values resulting from Scan Projection Radiograph (SPR) mode in CT against projection radiography and EOS imaging system when assessing scoliosis.
A dosimetry phantom was used to represent a 10-year old child. Thermoluminescent dosimetry detectors were used for measuring OD. The phantom was imaged with CT in SPR mode using 27 imaging parameters; projection radiography and EOS machines using local scoliosis imaging procedures. Imaging was performed in anteroposterior, posteroanterior and lateral positions.
17 protocols delivered significantly lower radiation dose than projection radiography (p < 0.05). OD values from the CT SPR imaging protocols and projection radiography were statistically significant higher than the results from EOS. No statistically significant differences in OD were observed between 10 imaging protocols and those from projection radiography and EOS imaging protocols (p > 0.05).
EOS has the lowest dose. Where this technology is not available we suggest there is a potential for OD reduction in scoliosis imaging using CT SPR compared to projection radiography. Further work is required to investigate image quality in relation to the measurement of Cobb angle with CT SPR.
脊柱侧弯被定义为脊柱在冠状面出现侧弯畸形。它需要定期进行X线成像以监测病情进展，因此脊柱侧弯患者经常暴露于辐射中。降低年轻患者这些辐射暴露的风险很重要。这项工作的目的是在评估脊柱侧弯时，比较CT扫描投影射线照相（SPR）模式与投影射线照相和EOS成像系统所产生的器官剂量（OD）值。
使用一个剂量学体模来模拟一名10岁儿童。使用热释光剂量探测器测量器官剂量。使用27个成像参数，以SPR模式对体模进行CT成像；使用局部脊柱侧弯成像程序对投影射线照相和EOS机器进行成像。成像在前后位、后前位和侧位进行。
17种方案所产生的辐射剂量显著低于投影射线照相（p < 0.05）。CT的SPR成像方案和投影射线照相的器官剂量值在统计学上显著高于EOS的结果。在10种成像方案与投影射线照相和EOS成像方案之间，未观察到器官剂量有统计学上的显著差异（p > 0.05）。
EOS的剂量最低。如果没有这项技术，我们认为与投影射线照相相比，使用CT的SPR进行脊柱侧弯成像有可能降低器官剂量。需要进一步开展工作，以研究与用CT的SPR测量Cobb角相关的图像质量。
