3M和5M液晶显示器对不同分辨率乳腺体模图影像显示质量的研究

Imaging quality comparison of 3- and 5-megapixel liquid crystal display monitors on high-and low-resolution breast phantom images

目的比较不同分辨率乳腺机获得的专用模体测试结果,评估3M与5M医用专业显示器对乳腺影像显示质量的影响。方法使用70μm和100μm分辨率乳腺机分别拍摄对比度细节乳腺摄影(CDMAM)。由4名放射诊断医师和2名技师在标准和放大显示模式下,评估2种显示器所能显示的最小圆盘直径(Di)与厚度(Ci,th),并计算出影像质量因子反数值(IQFinv)。2种显示器及2种显示模式的比较均采用配对t检验。结果在使用100μm分辨率乳腺影像数据时,无论是标准显示模式还是放大显示模式,2种显示器的影像细节显示能力相仿(P>0.05);使用70μm分辨率乳腺影像数据时,在标准显示模式下,5M显示器可识别最小直径为(0.130±0.000)mm,小于3M显示器的(0.155±0.012)mm(P=0.004)。5M显示器的IQFinv值显著高于3M显示器(P=0.036)。在放大显示模式下,3M与5M显示器的可识别最小直径相同[(0.125±0.012)mm],5M显示器的IQFinv值高于3M显示器,但差异无统计学意义(P>0.05)。无论哪种分辨率图像与显示器组合,在放大模式下阅片的影像质量均优于标准模式(P=0.010)。结论 70μm分辨率数据配备5M显示器可获得高质量图像,利用阅读时的放大模式在一定程度上可改善3M显示器对各种细节的显示。

Objective To Compare the imaging quality of 3- and 5-megapixel liquid crystal display （LCD） monitors on high- and low-resolution breast phantom images. Methods The contrast detail mammography （CDMAM） phantom was exposed at 70 IX m and 100 IX m resolution digital mammography respectively. Pour radiologists and two technicians evaluated the X-ray phantom in standard and magnification modes by recording the minimum diameter （mm） of every row （thickness, μ m）, and calculating imaging quality figure inversion （IQPinv）. Results The display capability of breast imaging at 100 μm resolution was similar in 3M and 5M LCD monitors, whether in standard or magnification mode （P〉0.05）. On breast imaging at 70 μ m resolution, the minimum diameter observed by 5M monitor was （0.130 ± 0.000） mm, less than that of （0.155 ± 0.012） mm by 3M monitor （P=0.004）. 5M monitor＇s IQPinv value was significantly higher than 3M monitor＇s （P=0.036） in standard mode. In magnification mode, the minimum diameter observed by both 5M and 3M monitors were equal [（0.125 ± 0.012） ram]. 5M monitor＇s IQPinv value was higher than 3M monitor＇s, but there was no significant difference （P〉0.05）. Whatever the image resolution, the imaging quality in magnification mode was superior to standard mode （P=0.010）. Conclusion The breast imaging at 70 μm resolution combined with 5M monitor can obtain high-quality images. The magnification mode can improve the display capabilities.