摘要
目的:探讨不同矩阵大小对一体化PET/MR图像质量的影响。方法:依据美国电器制造商协会(NEMA)NU2-2007标准,对国际电工委员会(IEC)61675-1标准规定的PET图像质量体模进行扫描;分别在像素矩阵为128×128、192×192和256×256的3种不同条件下重建PET图像,分析对比度(Q)、背景变化率(N)、信噪比(SNR)、衰减和散射矫正精度(?C)等参数。结果:以像素矩阵128×128条件下重建结果为参考,使用飞行时间(TOF)技术和非TOF技术,对比度平均值分别增长11.45%、10.1%和7.14%、7.92%;背景变化率均值分别降低了0.04%、0.22%和0.27%、0.2%;信噪比均值分别提高了3.71、3.69和2.71、3.06;衰减和散射矫正精度均值分别增加了0.28%、0.28%和1.04%、0.33%。结论:增大图像重建矩阵可提高PET图像质量,两种较大矩阵之间的图像质量差异并不明显。
Objective: To explore the effects of different matrix sizes on image quality of integrated PET/MR. Methods: According to the NU 2-2007 protocol of NEMA, the PET image quality phantom that was stipulated by(IEC)61675-1 standard was scanned. Under different sizes of matrix(128×128, 192×192, 256×256), PET image were reconstructed. And then, the contrast recovery(Q), background variability(N), signal-to-noise ratio(SNR) and correction precision of attenuation and scattering(ΔC) were further analyzed. Result: The reconstructed result of the matrix size of 128×128 was used as reference. The means of Q were increased 11.45% and 10.1% under the condition of TOF technique and means were increased 7.14% and 7.92% under the condition of non-TOF. And the means of N were decreased 0.04% and0.22% with TOF, and those were decreased 0.27% and 0.2% with non-TOF. And the means of SNR were increased 3.71 and 3.69 with TOF, and those were increased 2.71 and 3.06 with non-TOF. Besides, the means of ΔC were increased 0.28% and 0.28%with TOF and those were 1.04% and 0.33% with non-TOF. Conclusion: Through enlarges the reconstructed image matrix can enhance image quality of PET. And the difference of image quality between the two larger matrixes was no significant.
作者
吴萍
吴天棋
白玫
MR/WU Ping;WU Tian-qi;BAI Mei(Department of Medical Engineering,Xuanwu Hospital,Capital Medical University,Beijing 100053,China)
出处
《中国医学装备》
2019年第3期43-47,共5页
China Medical Equipment
基金
国家重点研发计划(2016YFC0103909)"PET/MR在神经系统疾病中的高级临床应用"
