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Comparative Study
. 2012 Jul;41(5):385-91.
doi: 10.1259/dmfr/96188015.

MR T1 and T2 relaxations in cysts and abscesses measured by 1.5 T MRI

U N Yilmaz  1 , F Yaman, S S Atilgan
Affiliations
Comparative Study

MR T1 and T2 relaxations in cysts and abscesses measured by 1.5 T MRI

U N Yilmaz et al. Dentomaxillofac Radiol. 2012 Jul.

Abstract

Objectives: The main objective of this study was to make a comparison between the relaxation rates in jaw cysts and abscesses. Such a comparison should provide quantitative information for MR image analysis.

Methods: A phantom containing 20 odontogenic jaw cysts and 11 jaw abscesses was imaged with 1.5 T MR. T(1) measurements were performed by using a mixed sequence of inversion recovery and spin echo, while T(2) measurements were carried out by the Carr-Purcell Meiboom-Gill (CPMG) sequence. Cystic fluids and abscesses were compared statistically.

Results: In cysts and abscesses, respectively, the mean 1/T(1) was 0.9355 s(-1) and 0.8245 s(-1) and the mean 1/T(2) was 2.4575 s(-1) and 4.7073 s(-1). The 1/T(2) in cysts was very highly significantly different from that in abscesses (p = 0.0001). Both T(1) and T(2) were linearly proportional to material contents. T(2) relaxivities [26.458 ml (g s)(-1) for abscesses and 21.455 ml (g s)(-1) for cysts] were higher than T(1) relaxivities [5.4766 ml (g s)(-1) for abscesses and 10.075 ml (g s)(-1) for cysts].

Discussion: Present T(2) measurements differentiate cysts from abscesses with a confidence interval of 95%. Because in vivo and in vitro image contrasts are changed by the same parameters, the T(2) findings should present valuable information for in vivo MRI. Hence the significant difference and the relaxivities may provide quantitative information for clinicians and researchers making image analyses.

Conclusion: T(2) may differentiate cysts from abscesses. The difference in T(2) is related to the material content of samples.

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Figures

Figure 1
Figure 1
T1 map of cysts and abscesses. Top to bottom: second and third rows show abscesses and other rows show cysts
Figure 2
Figure 2
T2 map of cysts and abscesses. Top to bottom: second and third rows show abscesses and other rows show cysts
Figure 3
Figure 3
Comparison of the 1/T1 in cysts and abscesses for a confidence interval (CI) of 95%. The upper borders of the left and right boxes show the mean values of 1/T1 for cysts and abscesses, respectively. The vertical lines represent the relevant CI. A large part of the CI for cysts overlaps that of abscesses. It means that 1/T1 values of a significant amount of cysts overlap those of abscesses
Figure 4
Figure 4
Comparison of the 1/T2 in cysts and abscesses for a confidence interval (CI) of 95%. The upper borders of the left and right boxes show the mean values of 1/T2 for cysts and abscesses, respectively. The vertical lines represent the relevant CI. The CI for cysts is completely discrete from that of abscesses. This means that 1/T2 values for 95% of cysts are different to that for 95% of abscesses
Figure 5
Figure 5
The least square fits of the 1/T1 in cysts and abscesses vs dry solid content. Squares and triangles denote cysts and abscesses, respectively
Figure 6
Figure 6
The least square fits of the 1/T2 in cysts and abscesses vs dry solid content. Squares and triangles denote cysts and abscesses, respectively
See this image and copyright information in PMC

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