Diagnostic value of maximum signal intensity on T1-weighted MRI images for differentiating parotid gland tumours along with pathological correlation

Abstract Background: Even without atherosclerosis, diabetes increases the risk of death from coronary heart disease and heart failure. Myocardial perfusion dysfunction may occur in the early stage of diabetic cardiomyopathy, but its examination method is relatively complex. It is very important to carry out targeted cardiac screening to find the factors related to diabetic myocardial perfusion in the early stage. Methods: We enrolled 77 patients with diabetes and 30 controls, performed anthropometric and laboratory tests such as blood glucose and lipids, and calculated Framingham Cardiovascular Disease 10-year-risk Score (FRS). All participants underwent cardiac magnetic resonance examinations and recorded their cardiac structure, functional indicators (such as ejection fraction (EF), end-diastolic volume (EDV), end-systolic volume (ESV), stroke volume(SV), peak filling rate (PFR),myocardial perfusion index (maximum upslope (Slope), half time to maximum signal intensity (Time50Max (s)), time to maximum signal intensity (TimeMax (s)), the maximum signal intensity (MaxSI),, basic signal intensity (Baseline),the ratio of MaxSI and Baseline ((MaxSI (BL) %), the difference value between MaxSI and Baseline (MaxSI (BL))). Results: Compared with normal group, no cardiovascular symptoms of left ventricular and right ventricular systolic function in patients with diabetes and end-diastolic and end systolic volume had no obvious difference, left ventricular PFR is lower than normal (279.65 + 57.62 vs. 322.57 + / - 78.29, p = 0.02), in the subgroup analysis we found that the FRS high-risk groups, ventricular septal thickening tend to, and Slope, MaxSI, MaxSI BL (%), MaxSI (BL) were significantly lower than the high risk group, Time50Max and TimeMax were significantly longer than the non-high-risk group, and FRS was negatively correlated with Slope, MaxSI(%BL) and positively correlated with TimeMax(s) and Time50Max(s), with statistical significance. Conclusion: Systolic function remains and diastolic function decreases in asymptomatic diabetic patients. Moreover, the patients with high risk of FRS had significant decreased perfusion function, and the quantitative indexes of perfusion function were closely related to FRS. It is of great value to pay attention to the changes of FRS score for early screening and diagnosis of diabetic heart disease.

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Comparison of Maximum Signal Intensity of Magnevist Contrast Agent in Modified T1 Weighted Spin Echo, T1 Weighted Fast Spin Echo and T1 Weighted Gradient Echo Sequences

10.31661/jbpe.v0i0.512 ◽

2019 ◽

Keyword(s):

Contrast Agent ◽

Signal Intensity ◽

Spin Echo ◽

Fast Spin Echo ◽

Gradient Echo ◽

Maximum Signal Intensity ◽

Fast Spin ◽

Maximum Signal

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Diagnostic value of dynamic contrast-enhanced MRI for unilocular cystic-type ameloblastomas with homogeneously bright high signal intensity on T2-weighted or STIR MR images

Oral Oncology ◽

10.1016/j.oraloncology.2010.11.009 ◽

2011 ◽

Vol 47 (2) ◽

pp. 147-152 ◽

Cited By ~ 16

Author(s):

Miki Hisatomi ◽

Yoshinobu Yanagi ◽

Hironobu Konouchi ◽

Hidenobu Matsuzaki ◽

Toshihiko Takenobu ◽

...

Keyword(s):

Signal Intensity ◽

Diagnostic Value ◽

High Signal Intensity ◽

High Signal ◽

Mr Images ◽

Dynamic Contrast Enhanced Mri ◽

Dynamic Contrast Enhanced ◽

Contrast Enhanced ◽

Cystic Type ◽

Contrast Enhanced Mri

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Differentiation of Benign and Malignant Parotid Gland Tumors with MRI and Diffusion Weighted Imaging

Medeniyet Medical Journal ◽

10.5222/mmj.2021.84666 ◽

2021 ◽

Author(s):

Umut Perçem Orhan Söylemez ◽

Başak Atalay

Keyword(s):

Parotid Gland ◽

Signal Intensity ◽

Perineural Spread ◽

Adc Value ◽

Parotid Gland Tumors ◽

Superficial Lobe ◽

Adjacent Structures ◽

Significant Difference ◽

Pleomorphic Adenomas ◽

Adc Values

Objective: This study investigated the effectivity of Magnetic Resonance Imaging (MRI) findings and Apparent Diffusion Coefficient (ADC) value in evaluating parotid gland tumors (PGTs), and aimed to reduce the biopsy procedure before surgery. Methods: This retrospective study included 54 PGTs of 42 patients’ (24 female, 18 male, mean age; 51.4±15.9). All of the patients had an MRI, and histopathologic diagnosis. The signal intensity [T1 and T2 Weighted (W), T1W after intravenous contrast agent injection] and mean ADC values of the PGTs were measured. Also contrast enhancement pattern (homogenous, heterogeneous, peripheral or none), margin features (well or ill-defined), sizes, location (superficial lobe/deeplobe/both), perineural spread, presence of lymphadenopathy, and extension to adjacent structures were noted. Results: The distribution of PGTs was; 21 pleomorphic adenomas, 18 Warthin tumors, 2 lymph nodes, 2 mucoepidermoid carcinomas, 5 adenoid cystic carcinoma, 1 basal cell carcinoma,2 metastases and 2 lymphomas; (13 malignant and 41 benign lesions). Morphologic parameters; ill-defined margin, perineural spread, lymphadenopathy, and extension to adjacent structures were found to be significantly associated with malign lesions (p<0.01). There was a significant difference between ADC values of malignant and benign PGTs (p<0.05). Also ADC values and T2 signal intensity was significantly lower in Warthin tumors rather than pleomorphic adenomas (p<0.05). Conclusions: Mean ADC values when considered with morphological features may be accessible methods to distinguish benign and malignant PGTs, also ADC values and T2 signal intensity may be useful for differentiating pleomorphic adenomas from Warthin tumors, thereby reducing the number of biopsies and thus complications.

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Diagnostic value of magnetic resonance imaging in the analysis of ameloblastoma: report of two cases

Brazilian Dental Science ◽

10.14295/bds.2019.v22i3.1763 ◽

2019 ◽

Vol 22 (3) ◽

pp. 425-431

Author(s):

Neiandro Santos Galvão ◽

Antonione Santos Bezerra Pinto ◽

Alan Leandro Carvalho Farias ◽

André Luiz Ferreira Costa ◽

Sérgio Lúcio Pereira de Castro Lopes ◽

...

Keyword(s):

Magnetic Resonance Imaging ◽

Differential Diagnosis ◽

Magnetic Resonance ◽

Signal Intensity ◽

Diagnostic Value ◽

Resonance Imaging ◽

Intermediate Signal Intensity ◽

Additional Information ◽

Imaging Characteristics ◽

Magnetic Resonance Imaging Mri

Ameloblastoma is an odontogenic tumor that shares clinical and imaging characteristics with other lesions of the jaws, such as odontogenic keratocyst, which makes the diagnosis difficult. However, in addition to radiographic and tomographic examinations, Magnetic Resonance Imaging (MRI) has been increasingly used, contributing with relevant additional information about the differentiation between solid and liquid components of the lesion. This case report was conducted to present two variations of ameloblastoma and discuss the radiographic, tomographic and MRI contribution in the differential diagnosis between ameloblastoma and odontogenic keratocyst.The signal intensity in T1-weighted MRI revealed internal fluid content in both cases, which was important in the differential diagnosis with other intraosseous lesions such as odontogenic keratocysts. This is probably due to the presence of keratin that increases the viscosity of the content and also for an intermediate signal intensity signal in T2-weighted MRI. Therefore, MRI revealed important internal characteristics of the reported lesions, which was very useful in the establishment of the differential diagnosis with other lesions.

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