Abstract：
Imaging of the cervical spine in general radiography is most frequently performed using an anti-scatter grid. The purpose of this study was to investigate the effects of a gridless setting on image quality and radiation dose during digital radiography of the anteroposterior (AP) and lateral (LAT) cervical spine.
A phantom study was performed with a variety of tube voltages (63-75 kV) with and without an anti-scatter grid. The tube current time product (mAs) and dose area product (DAP) were recorded and used to calculate effective dose (ED) and individual organ dose using PCXMC 2.0 software, as well as entrance surface dose (ESD) and objective image quality: signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR). Subjective visual image quality grading characteristics (VGC) was performed by five qualified radiographers.
In a gridless setting, the AP and LAT positions showed significantly lower DAP (1.6 μGym2; 61.3 % and 1.6 μGym2; 51.2%), ESD (27.6 μGy; 57.3% and 77.2 μGy; 47.2%) and ED (4.2 μSv; 61.3% and 2.3 μSv; 48.9%). In a gridless setting in the AP position, there is a slight significant deterioration in image quality. In the lateral projection, on the other hand, the image quality without the use of grid was only significantly reduced in three of six criteria and there was no difference in the objective image quality between the two settings examined.
The results of this study show that gridless setting significantly decreases radiation dose and image quality, but the quality in the lateral projection is still acceptable for diagnostic purpose.
The protocol without the use of the anti-scatter grid in cervical spine radiography leads to a reduction in the radiation dose in both projections, but the image quality in the AP is significantly reduced for all criteria examined, with a slight deterioration in image quality in the lateral projection.
A phantom study was performed with a variety of tube voltages (63-75 kV) with and without an anti-scatter grid. The tube current time product (mAs) and dose area product (DAP) were recorded and used to calculate effective dose (ED) and individual organ dose using PCXMC 2.0 software, as well as entrance surface dose (ESD) and objective image quality: signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR). Subjective visual image quality grading characteristics (VGC) was performed by five qualified radiographers.
In a gridless setting, the AP and LAT positions showed significantly lower DAP (1.6 μGym2; 61.3 % and 1.6 μGym2; 51.2%), ESD (27.6 μGy; 57.3% and 77.2 μGy; 47.2%) and ED (4.2 μSv; 61.3% and 2.3 μSv; 48.9%). In a gridless setting in the AP position, there is a slight significant deterioration in image quality. In the lateral projection, on the other hand, the image quality without the use of grid was only significantly reduced in three of six criteria and there was no difference in the objective image quality between the two settings examined.
The results of this study show that gridless setting significantly decreases radiation dose and image quality, but the quality in the lateral projection is still acceptable for diagnostic purpose.
The protocol without the use of the anti-scatter grid in cervical spine radiography leads to a reduction in the radiation dose in both projections, but the image quality in the AP is significantly reduced for all criteria examined, with a slight deterioration in image quality in the lateral projection.
摘要：
背景：在普通射线照相术中，颈椎成像最常使用抗散射网格进行。这项研究的目的是研究在前后位（AP）和外侧（LAT）颈椎的数字X线摄影过程中，无网格设置对图像质量和辐射剂量的影响。
方法：在有和没有防散射网格的情况下，对各种管电压（63-75kV）进行了体模研究。记录管电流时间乘积（mAs）和剂量面积乘积（DAP），并使用PCXMC2.0软件计算有效剂量（ED）和单个器官剂量。以及入射表面剂量（ESD）和客观图像质量：信噪比（SNR）和对比噪声比（CNR）。主观视觉图像质量分级特征（VGC）由五名合格的射线技师进行。
结果：在无网格设置中，AP和LAT位置显示出显着较低的DAP（1.6μGym2;61.3％和1.6μGym2;51.2％），ESD(27.6μGy;57.3%和77.2μGy;47.2%)和ED(4.2μSv;61.3%和2.3μSv;48.9%)。在AP位置的无网格设置中，图像质量有轻微的显著恶化。在横向投影中，另一方面,没有使用网格的图像质量仅在六个标准中的三个标准中显著降低，并且所检查的两个设置之间的客观图像质量没有差异。
结论：这项研究的结果表明，无网格设置显着降低了辐射剂量和图像质量，但是横向投影的质量对于诊断目的仍然可以接受。
结论：在颈椎X线摄影中不使用抗散射网格的方案导致两个投影中的辐射剂量减少，但是对于所有检查的标准，AP中的图像质量显着降低，在横向投影的图像质量略有恶化。
方法：在有和没有防散射网格的情况下，对各种管电压（63-75kV）进行了体模研究。记录管电流时间乘积（mAs）和剂量面积乘积（DAP），并使用PCXMC2.0软件计算有效剂量（ED）和单个器官剂量。以及入射表面剂量（ESD）和客观图像质量：信噪比（SNR）和对比噪声比（CNR）。主观视觉图像质量分级特征（VGC）由五名合格的射线技师进行。
结果：在无网格设置中，AP和LAT位置显示出显着较低的DAP（1.6μGym2;61.3％和1.6μGym2;51.2％），ESD(27.6μGy;57.3%和77.2μGy;47.2%)和ED(4.2μSv;61.3%和2.3μSv;48.9%)。在AP位置的无网格设置中，图像质量有轻微的显著恶化。在横向投影中，另一方面,没有使用网格的图像质量仅在六个标准中的三个标准中显著降低，并且所检查的两个设置之间的客观图像质量没有差异。
结论：这项研究的结果表明，无网格设置显着降低了辐射剂量和图像质量，但是横向投影的质量对于诊断目的仍然可以接受。
结论：在颈椎X线摄影中不使用抗散射网格的方案导致两个投影中的辐射剂量减少，但是对于所有检查的标准，AP中的图像质量显着降低，在横向投影的图像质量略有恶化。
