Quantitative Assessment of the Apparent Diffusion Coefficient Values of the Inflammatory Connective Tissue Around the Mandibular Condyle in Rheumatoid Arthritis

Kaneda

Kondo

et al. 2023

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ObjectiveThis retrospective study aimed to assess the parotid glands in diabetes mellitus (DM) using diffusion‐weighted magnetic resonance imaging (DW‐MRI).MethodsWe investigated 54 patients aged between 38 and 83 years, with DM (DM group) and without DM (control group), who underwent magnetic resonance imaging (MRI) in the facility between November 2006 and January 2021. We calculated the median apparent diffusion coefficients (ADCs) of the parotid glands in the control group and DM group. These groups were compared using the Mann–Whitney U tests. A receiver operating characteristic (ROC) curve analysis was performed to assess the ability of the ADC to predict DM. Statistical significance was set at p < 0.05.ResultsThe median ADCs of parotid grands in the control group and DM group were 0.83 × 10−3 mm2/s and 0.74 × 10−3 mm2/s, respectively (p < 0.01). ROC analysis revealed a cut‐off ADC value of 0.81 to distinguish between the control and DM group. Sensitivity, specificity, accuracy, and area under the ROC curve were 0.7, 0.67, 0.69, and 0.71, respectively.ConclusionThe ADC was significantly higher in DM groups than in the control group. This suggests that DW‐MRI may be able to quantitatively distinguish parotid glands between normal and DM patients.

Section: Discussionmentioning

confidence: 99%

Diffusion‐weighted magnetic resonance imaging of parotid glands in diabetes mellitus: A preliminary study

Kaneda

Kondo

et al. 2023

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“…Several studies have evaluated the apparent diffusion coefficient values calculated from DWI (e.g., osteomyelitis malignancy, osteoporosis, normal bone marrow, and trauma). [9][10][11][12][13] Moreover, there are studies that noninvasively imaged the muscle structure of the tongue using MRI. 14 Furthermore, oral frailty has been considered an important problem in recent years and has been reported to affect oral function and mortality.…”

Section: Introductionmentioning

confidence: 99%

“…Quantitative evaluation is possible by acquiring the ADC calculated from diffusion weighted images with multiple b values. Several studies have evaluated the apparent diffusion coefficient values calculated from DWI (e.g., osteomyelitis malignancy, osteoporosis, normal bone marrow, and trauma) 9–13 . Moreover, there are studies that noninvasively imaged the muscle structure of the tongue using MRI 14 …”

Section: Introductionmentioning

confidence: 99%

Quantitative analysis of tongue changes with aging using diffusion‐weighted magnetic resonance imaging

Kondo

Ito

et al. 2022

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ObjectiveThis study aimed to quantitatively assess the changes in the apparent diffusion coefficient (ADC) value of the tongue with aging using diffusion‐weighted imaging (DWI).MethodsIn this retrospective study, we analyzed the ADC map of 480 patients (230 men, 250 women; mean age, 53.66 years; age range, 20–89 years) with the tongue not affected by disease, between January 2018, and February 2020. The Mann–Whitney U test was performed with the ADC value as the explanatory variable and the sex as the criterion variable. Moreover, we calculated the Spearman's correlation coefficient with age as the criterion variable and ADC value as the explanatory variable.ResultsA significantly positive correlation was found between age and ADC values of the tongue in the men and women groups (P < 0.001). However, no significant differences were observed between the sex and the ADC values of the tongue (P = 0.19).ConclusionsThese findings suggest that age should be taken into consideration when making a differential diagnosis of the tongue using ADC values.

“…Among them, MRI, an excellent aid for evaluating soft tissues, is frequently used to evaluate articular disk displacement and joint effusion in the TMJs 4,5 . Furthermore, in recent years, quantitative evaluation of TMDs has been performed using diffusion‐weighted MRI 6,7 . These studies suggest that the diagnostic accuracy of MRI for TMDs is very high 8 …”

Section: Introductionmentioning

confidence: 99%

“…4,5 Furthermore, in recent years, quantitative evaluation of TMDs has been performed using diffusion-weighted MRI. 6,7 These studies suggest that the diagnostic accuracy of MRI for TMDs is very high. 8 In contrast, the mandibular gonial angle is a quantitative indicator used to explain the mandibular growth pattern.…”

mentioning

confidence: 97%

Relationship between gonial angle and articular disk position of the temporomandibular joints: A retrospective study

Hirahara

Tokunaga

et al. 2022

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PurposeMagnetic resonance imaging (MRI) is frequently used to diagnose temporomandibular joint disease. However, very few studies have assessed the relationship between the mandibular gonial angle and temporomandibular joint (TMJ) disorders using panoramic radiography and MRI. The aim of this study was to assess the relationship between the gonial angle and articular disk position of the TMJs using panoramic radiography and MRI.Material and methodThe patients underwent panoramic radiography and MRI simultaneously at a university hospital between April 2017 and March 2018. We analyzed the records of 109 patients with and without disc displacement. Among these, 88 patients had disc displacement of the TMJ, while 21 patients were normal. The variable “mean mandibular gonial angle” was evaluated as a predictor. The primary outcome was the presence or absence of disc displacement in the TMJs. The other variables included sex and age. Data were analyzed using Spearman's rank correlation coefficient, the Mann–Whitney U test, and receiver operating characteristic (ROC) curves. Statistical significance was set at P < 0.05.ResultsThere was no significant difference between men and women in mean gonial angle, and there was no correlation with age (P > 0.05). Moreover, the mean mandibular gonial angle in the disc displacement group was significantly higher than that in the nondisc displacement group (P < 0.01). ROC analysis revealed a cutoff mandibular gonial angle of 120.23° for predicting the development of disc displacement.ConclusionsMandibular gonial angle is a useful parameter for predicting disc displacement of the TMJs.