ABSTRACT
[Abstract] Objective To investigate the high field MRI performance of uterus and its periodical changes in bearing aged women for providing a diagnostic evidence for the uterus diseases. Methods Thirty volunteers with normal menstrual cycle underwent high field-intensity MRI scanning twice within one menstrual cycle (proliferative and secretive phase) with GE3.0T MRI in the Sixth Medical Center of Chinese PLA General Hospital from Oct. 2014 to Dec. 2017. The sagittal position of T2 weighted images (T2WI) was considered as the main rank to observe the MRI performances of uterus, and the signal intensity and thickness of each part of uterus in the two different phases were measured and compared. Results Uterus demonstrated four layers with different signal intensity on a sagittal T2WI as, from inside to outside, endometrium with high intensity, junction-zone with hypointensity, myometrium with mild hyperintensity, and serosa with hypointensity, respectively. The thickness and the signal intensity in each layer of uterus changed with the menstrual cycle: the thickness of endometrium was thicker in secretive phase than in proliferative phase [(12.2±1.6)mm vs. (5.4±1.2)mm] with significant difference (P<0.01). The T2WI signal intensity of the myometrium was higher in secretive phase than in proliferative phase (281.3±22.4 vs. 205.9±19.7) with statistical significance (P<0.01). Conclusion High field MRI may finely discriminate the four layers of uterus and their periodical changes, so can evaluate the lesions of the uterus.
ABSTRACT
Objective To investigate the diagnostic value of MRI in hypertrophic pachymeningitis (HP). Methods MRI images of 11 patients with HP were analyzed retrospectively. The characteristic signs of the MRI images, and the relationship between the MRI features and pathology of HP were reviewed. Results In the 11 cases of HP, involvement of cerebral dura mater accounted for 8 cases, with spinal dura mater involvement in 2, both cerebral and spinal dura mater involvement in the other one case. The main sign of HP in MRI was an increased thickness of the dura mater, which showed iso-or hypointensity on T1WI without significant difference as compared with the brain parenchyma and spinal cord. The thickened dura mater showed obviously low signal on T2WI, and it was recognized easily as compared with the brain parenchyma and the spinal cord. On the DWI of 9 cases who had cerebral dura mater involvement, increased dura mater showed lower signal, but it was not so distinct as shown on T2WI. On the post-contrast T1WI, the thickened dura mater showed obvious enhancement, displaying better images than that of preenhancement image. Conclusion Among the different MRI techniques, T2-weighted imaging and post-enhanced T1WI have their advantages in the diagnosis of HP, and other MR imaging techniques could be complementary in increasing diagnostic accuracy and comprehensiveness.
ABSTRACT
No abstract available.
ABSTRACT
OBJECTIVE: To compare the iterative decomposition of water and fat with echo asymmetry and the least-squares estimation (IDEAL) method with a fat-saturated T2-weighted (T2W) fast recovery fast spin-echo (FRFSE) imaging of the spine. MATERIALS AND METHODS: Images acquired at 3.0 Tesla (T) in 35 patients with different spine lesions using fat-saturated T2W FRFSE imaging were compared with T2W IDEAL FRFSE images. Signal-to-noise ratio (SNR)-efficiencies measurements were made in the vertebral bodies and spinal cord in the mid-sagittal plane or nearest to the mid-sagittal plane. Images were scored with the consensus of two experienced radiologists on a four-point grading scale for fat suppression and overall image quality. Statistical analysis of SNR-efficiency, fat suppression and image quality scores was performed with a paired Student's t test and Wilcoxon's signed rank test. RESULTS: Signal-to-noise ratio-efficiency for both vertebral body and spinal cord was higher with T2W IDEAL FRFSE imaging (p < 0.05) than with T2W FRFSE imaging. T2W IDEAL FRFSE demonstrated superior fat suppression (p < 0.01) and image quality (p < 0.01) compared to fat-saturated T2W FRFSE. CONCLUSION: As compared with fat-saturated T2W FRFSE, IDEAL can provide a higher image quality, higher SNR-efficiency, and consistent, robust and uniform fat suppression. T2W IDEAL FRFSE is a promising technique for MR imaging of the spine at 3.0T.
Subject(s)
Adult , Aged , Aged, 80 and over , Female , Humans , Male , Middle Aged , Image Interpretation, Computer-Assisted , Magnetic Resonance Imaging/methods , Signal-To-Noise Ratio , Spinal Diseases/diagnosis , Statistics, NonparametricABSTRACT
<p><b>OBJECTIVE</b>To research the value of hepatic perfusion with multi-slice spiral CT in the diagnosis of liver diseases.</p><p><b>METHODS</b>Among the 48 patients undergone dynamic CT of the liver, 20 were volunteers without hepatic disorder, 17 with cirrhosis, 11 suffered from hepatic cancer. The perfusion indexes were calculated and compared.</p><p><b>RESULTS</b>(1) Compared with the control group, HPP (ml/min/ml), PPI and HPP/HAP of patients with cirrhosis were significant lower (HPP: 0.49+/-0.19 vs 0.60+/-0.16, P=0.038; PPI: 0.58+/-0.14 vs 0.67+/-0.06, P=0.015; HPP/HAP: 1.63+/-0.87 vs 2.12+/-0.65, P=0.04), whereas HPI was higher (0.42+/-0.14 vs 0.33+/-0.06, P= 0.015), which indicated the decrease of portal inflow and the increase of arterial inflow in cirrhosis patients. (2) Patients with hepatic cancer got a significant higher average HAP than that in volunteers and cirrhosis patients (F=11.71, P<0.001), while their HPP and HPP/HAP showed significant declining (F=22.84, P=0.0001; F=20.67, P<0.0001, respectively), which implied that hepatic cancer was mainly supplied by artery.</p><p><b>CONCLUSIONS</b>Hepatic perfusion with multi-slice spiral CT is an non-invasive technique to evaluate the arterial and portal inflow separately, which can inflect the hemodynamic change of the lesion by the perfusion indexes, and identify the condition of the tissue round the lesion prior to morphologic change. This method shows important value of diagnosis and differential diagnosis in hepatic diseases.</p>