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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
Journal of Magnetics, Volume 27, Number 2, 30 Jun 2022, Pages 217-222
Abstract
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.
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.
Keywords: zero filling interpolation; ACR phantom; quality assurance; spatial resolution; matrix size
DOI: https://doi.org/10.4283/JMAG.2022.27.2.217
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