Medical Imaging and Radiotherapy Department, Faculty of Health Sciences, University of Ljubljana, Zdravstvena pot 5, Ljubljana 1000, Slovenia.
Slovenian Radiation Protection Administration, Ljubljana, Slovenia.
Radiat Prot Dosimetry. 2020 Jul 24;189(4):420-427. doi: 10.1093/rpd/ncaa057.
To determine the influence of optimal collimation during lumbar spine radiography on radiation dose and image quality.
110 lumbar spine patients were split into two groups-the first imaged with standard collimation and the second with optimal collimation. Body mass index, image field size, exposure conditions and dose area product were measured. Effective and absorbed organ doses were calculated. Image quality was assessed.
Optimal collimation reduced the primary field by up to 40%. The effective dose was reduced by 48% for the AP projection, while no differences were found for the LAT projection due to incorrect positioning of the central beam with standard collimation. The absorbed dose to selected radiosensitive organs decreased by 41 and 10% in the AP and LAT projections, respectively. Image quality for the LAT projection improved by 24% and maintained for the AP projection.
Optimal collimation in lumbar spine imaging significantly influences patient exposure to radiation.
确定腰椎摄影时最佳准直对辐射剂量和图像质量的影响。
将 110 例腰椎患者分为两组，一组采用标准准直进行成像，另一组采用最佳准直进行成像。测量体质量指数、图像野大小、曝光条件和剂量面积产物。计算有效和吸收器官剂量。评估图像质量。
最佳准直可将原射线野缩小达 40%。AP 投影的有效剂量降低了 48%，而由于标准准直时中央射线束的定位不正确，LAT 投影没有差异。AP 和 LAT 投影中，选定的敏感器官的吸收剂量分别降低了 41%和 10%。LAT 投影的图像质量提高了 24%，AP 投影则保持不变。
腰椎成像中的最佳准直显著影响患者的辐射暴露。
