Pediatric digital chest radiography, comparison of grid versus non-grid techniques

Borgny Ween , Marte Olstad , Jarl Å. Jakobsen , Dag R. Olsen
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引用次数: 9

Abstract

Introduction

The usefulness of anti-scatter grid in digital pediatric chest radiography was investigated by a phantom study assessing image quality using subjective evaluations and dose measurements.

Method

A contrast detail study was undertaken. Images were taken with and without anti-scatter grids (grid ratio 15:1), for PMMA phantom thickness ranging from 1 to 15 cm. Fourteen radiographers, experienced in digital pediatric and/or skeletal radiography, read 96 images. At each thickness, the image with and without grid technique was read three times, and in random order. Correct Observation Ratio (COR) and Image Quality Figures (IQF) were calculated. Dose Area Products were measured with DAP-meter.

Results

The COR and IQF values indicated statistically significant (p < 0.05) enhanced image quality when using anti-scatter grid for all thicknesses 5 cm and more. The DAP values increased significantly by grid techniques (p = 0.01).

Conclusions

Grid techniques may be beneficial to image quality for PMMA objects over 5 cm, but this leads to a higher dose. Although the magnitude of dose may be low, the dose should be kept at a minimum. In conclusion, improving image quality should be based on optimizing post-processing settings and image evaluation conditions.

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儿科数字胸片,网格与非网格技术的比较
通过一项使用主观评价和剂量测量评估图像质量的幻影研究,研究了反散射网格在数字化儿童胸部x线摄影中的实用性。方法采用对比细部研究。采用抗散射网格(网格比例15:1)和不采用抗散射网格进行图像采集,PMMA模体厚度范围为1 ~ 15 cm。14名在数字化儿科和/或骨骼放射照相方面经验丰富的放射技师阅读了96张图像。在每个厚度下,采用网格技术和不采用网格技术的图像按随机顺序读取三次。计算正确的观测比(COR)和图像质量数字(IQF)。剂量面积积用dap仪测定。结果COR、IQF值差异有统计学意义(p <0.05)增强图像质量时,使用反散射网格所有厚度5厘米及以上。网格技术显著提高DAP值(p = 0.01)。结论网格技术可能有利于5 cm以上PMMA物体的成像质量,但这会导致更高的剂量。虽然剂量的大小可能很低,但剂量应保持在最低限度。综上所述,提高图像质量应基于优化后处理设置和图像评价条件。
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