Ji-Sung Jang, H. Lee, Seokhwan Yoon, Min-Cheol Jeon, S. Kim
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引用次数: 0
摘要
本研究旨在评估零填充插值(ZIP)和不同空间分辨率对质量保证(QA)的影响。评估磁共振图像质量的两个重要变量被纳入推荐的接受标准:高对比度空间分辨率和具有参考限的低对比度目标可检测性。所有获得的数据分为两组:A组(无ZIP)和B组(有ZIP)。b组t1加权和t2加权图像在两个方向上的空间分辨率均符合美国放射学会(American College of Radiology, ACR)标准,观察到的高对比度空间分辨率值在矩阵大小为320 × 320时,两组间差异有统计学意义(p < 0.05)。另一方面,当矩阵尺寸≥384 × 384时,两组在高对比度空间分辨率方面无显著差异(p > 0.05)。对于低对比度目标可检测性,所有组的测量辐条总数都满足ACR标准。而未加ZIP的低对比度目标可检测性值随着矩阵大小的减小而减小。ZIP的使用可以提高高对比度空间分辨率和低对比度目标的可检测性,同时降低图像的模糊度。
Comparison of a Zero-filling Interpolation with a Real Matrix Size at 1.5 Tesla Based on Spin-echo Weighted Imaging with Various Spatial Resolutions: An ACR Phantom Study
This study aimed to assess the effect of zero-filling interpolation (ZIP) and various spatial resolutions on quality assurance (QA). Two important variables for the assessments of magnetic resonance image quality were included with recommended acceptance criteria: high-contrast spatial resolution and low-contrast object detectability with reference limits. All acquired data were divided into two groups: group A (without ZIP) and group B (with ZIP). The spatial resolutions of both images of T1-weighted and T2-weighted imaging in both directions fulfilled the American College of Radiology (ACR) criterion in group B. The observed high-contrast spatial resolution values were significantly different between the two groups up to a matrix size of 320 × 320 (p < 0.05). On the other hand, with a matrix size ≥ 384 × 384, no significant differences between the two groups were observed in terms of high-contrast spatial resolution (p > 0.05). For low-contrast object detectability, the total number of measured spokes in all groups fulfilled the ACR criterion. However, the low-contrast object detectability values without ZIP tended to decrease as the matrix size decreased. The use of ZIP can improve high-contrast spatial resolution and low-contrast object detectability while reducing image blurriness.
期刊介绍:
The JOURNAL OF MAGNETICS provides a forum for the discussion of original papers covering the magnetic theory, magnetic materials and their properties, magnetic recording materials and technology, spin electronics, and measurements and applications. The journal covers research papers, review letters, and notes.