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<title>Chinese Journal of Magnetic Resonance Imaging RSS feed</title>
<link>http://med-sci.cn/cgzcx/en/contents_list.asp?issue=201106</link>
<language>zh-cn</language>
<copyright>An RSS feed for Chinese Journal of Magnetic Resonance Imaging</copyright>
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<title><![CDATA[Attention to clinical application of MRI in liver diseases]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2011.06.001</link>
<description><![CDATA[Epidemiological survey indicates around 130 million people in China are carriers of hepatitis B virus (HBV), nearly half the world total HBV carriers. And about one fourth would progress into chronic hepatitis, liver cirrhosis or primary liver cancer. Consequently, early prevention and diagnosis is critical for patients of hepatic diseases to improve outcomes and quality of life. As MRI offers a high resolution for the soft tissue, it is capable of localization and qualitative diagnosis for inflammation, edema and carcinomas. In addition, it is sensitive to the changes of metabolites. Therefore, its proper application is of great significance for early diagnosis, outcomes evaluation and following up of liver diseases.]]></description>
<pubDate>Mon,20 Jun 2011 00:00:00  GMT</pubDate>
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<title><![CDATA[Detection of focal liver lesions: comparison of DWI and BLADE-T2-SPAIR sequence]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2011.06.002</link>
<description><![CDATA[Objective: To compare the efficacy of DWI and BLADE-T2-SPAIR in detection of focal liver lesions. Materials and Methods:  Thirty-ﬁve patients with 51 focal hepatic lesions (31 malignant and 20 benign) were included in the study. Both BLADE-T2-SPAIR and DWI were performed on each patient. One radiologist interpreted BLADE-T2-SPAIR and DWI images and measured the signal intensity (SI) of the lesions and adjacent liver parenchyma on BLADE-T2-SPAIR and DWI, and the contrast ratios (CR, the ratio of SI of lesion/liver) were calculated. The detecting rates of the lesions and the mean CRs were compared between the two sequences. Results: There were no signiﬁcant difference in the detecting rate of cyst, hemangioma, metastatic tumor by BLADE-T2-SPAIR and DWI, the detecting rates of hepatocellular carcinoma (HCC) by BLADE-T2-SPAIR were higher (P <0.05) than those by DWI. CR was calculated for all lesions. The CRs of cyst on BLADE-T2-SPAIR were higher than those on DWI (P <0.05), and no signiﬁcant differences were found between the two sequences as for the CRs of hemangioma, HCC, metastatic tumor. Conclusions: DWI is not superior to T2WI in detection of HCC.]]></description>
<pubDate>Mon,20 Jun 2011 00:00:00  GMT</pubDate>
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<title><![CDATA[Thickened gallbladder wall on MR imaging in patients with liver cirrhotic infected by hepatitis B: correlation with clinical and laboratory results]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2011.06.003</link>
<description><![CDATA[Objective: To explore the correlative factors with thickened gallbladder wall in patients with liver cirrhosis caused by hepatitis B. Materials and Methods: The thickness of gallbladder wall, the diameter of portal vein, splenic vein, and superior mesenteric vein were measured on MRI with the laboratory results and virus replication collected. After divided into 2 groups with a threshold of 3 mm in gallbladder wall, the data were compared. Results: The 2 group showed signiﬁcant difference in serum albumin (P=0.004)and Child-pugh grading(P=0.002), with no difference in total bilirubin (P=0.066), total bile acids (P=0.841), virus replication (P=0.352), or diameter of portal vein (P=0.917), splenic vein (P=0.230), and superior mesenteric vein (P=0.322). Conclusions: The thickness of gallbladder wall in patients with liver cirrhosis infected by hepatitis B maybe associated with serum albumin level and Child-pugh grading. It maybe not correlative with total bilirubin, total bile acids, virus replication, diameter of portal vein, splenic vein and superior mesenteric vein.]]></description>
<pubDate>Mon,20 Jun 2011 00:00:00  GMT</pubDate>
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<title><![CDATA[Preliminary study of MR diffusion weighted imaging in evaluating the degree of liver cirrhosis]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2011.06.004</link>
<description><![CDATA[Objective: To investigate the value of MR diffusion weighted imaging (DWI) in patients with liver cirrhosis. Materials and Methods:  Ninety-ﬁve cases (35 healthy volunteers and 60 patients with liver cirrhosis) were recruited with their apparent diffusion coefficients (ADC) of liver analyzed. According to liver Child-Pugh classification, 60 patients with liver cirrhosis were classified into group AB (28 cases) and group C (32 cases) with their ADC measured and compared intra-group and with that of the volunteers. Results: The ADC values of the control group, group AB and group C were (1.28±0.14)×10-3 mm2/s, (1.18±0.17)×10-3 mm2/s,  and (0.91±0.34)×10-3 mm2/s, respectively. The difference was signiﬁcant between group C and group AB and group C and control group (P＝0.000, P＝0.000), respectively. There was no statistical signiﬁcance between group AB and control group (P=0.069). Conclusions: The value of ADC decreased as the aggravation of the hepatic cirrhosis. To some extent, the ADC value may reﬂect the degree of liver cirrhosis.]]></description>
<pubDate>Mon,20 Jun 2011 00:00:00  GMT</pubDate>
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<title><![CDATA[Imaging findings in four patients with hepatic veno-occlusive disease]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2011.06.005</link>
<description><![CDATA[Objective: To discuss the imaging characteristics of the hepatic veno-occlusive disease (HVOD). Materials and Methods: Four cases of HVOD were retrospectively analyzed. Each of the case was scanned by MRI in 3 dynamic phases after contrast enhancement and ultrasound. Three of the 4 cases were also dynamically scanned CT. The analysis was focused on the dynamic change of the parenchyma and the vasculature system and compared with that of pre-contrast images.  Results: Two cases were diagnosed by biopsy with the other 2 confirmed by clinical signs. On pre-contrast MR images, enlarged liver, seroperitoneum, and heterogenous signal intensities of the parenchyma were revealed. On post-contrast images, the liver demonstrated nonhomogenous enhancement in arterial phase, patchy enhancement and low-perfusion in portal vein phase, and slow wash-out in delayed phase. The dynamic change on CT images was similar with that of MRI. All of the cases revealed non-obstructive hepatic veins and inferior vena cava in ultrasound examination.    Conclusions: The findings of HVOD were non-specific in ultrasound, pre-contrast MR images, and pre-contrast CT. The signs of dynamic contrast images were more valuable for the diagnosis.]]></description>
<pubDate>Mon,20 Jun 2011 00:00:00  GMT</pubDate>
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<title><![CDATA[Clinic value of susceptibility weighted imaging in the detection of cerebral microbleeds]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2011.06.006</link>
<description><![CDATA[Objective: To evaluate the clinic value of cerebrovasccular in susceptibility weighted imaging (SWI) in the detection of cerebral microbleeds (CMBs). Materials and Methods: The study sample consisted of 172 patients. SWI was used to detect the CMBs number, location and investigate their association with clinic parameter, lacunar infarction and white mattet change. Results: Signiﬁcant correlations between microbleeds and age, hypertension, blood pressure, lacunar infarction, white matter change were observed. Systolic pressure was found closely associated with CMBs in patients with and without hypertension. In addition, a signiﬁcant correlation between the severity of CMBs and that of lacunar infarction, as well as white matter changes was noted. Conclusion: SWI is a valuable tool in detecting microbleeds for the prevention and treatment of cerebrovasccular diseases.]]></description>
<pubDate>Mon,20 Jun 2011 00:00:00  GMT</pubDate>
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<title><![CDATA[MR diffusion imaging of femoral head and neck in healthy adults]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2011.06.007</link>
<description><![CDATA[Objective: To study the imaging appearance and measure the ADC value with MR diffusion weighted imaging in healthy adult femoral head and neck. To provide normal reference rules to evaluate femoral diseases with MR-DWI. Materials and Methods: DWI was performed in 90 healthy volunteers. Forty-two males and 48 patients with age between 24 and 78 years (mean age of 57.3 years). These volunteers have no clinical symptoms, no any disease, surgery and trauma affecting hip joint and pelvic. Conventional MR imagings show normal hip joint. EPI-DWI were performed in GE 1.5 T MR unit, b values were 300, 500 and 700 s/mm2. The ADC of femoral head and neck of each volunteers were measured and compared among different positions. Then analyzed statistically.  Results: In different b values 300 s/mm2, 500 s/mm2, 700 s/mm2, the mean ADC value of femoral heads were (3.63±1.34)×10-4 mm2/s, (1.87±0.76)×10-4 mm2/s, (1.49±0.53)×10-4 mm2/s, the mean ADC value of femoral necks was (5.36±1.50)×10-4 mm2/s, (3.75±1.03)×10-4 mm2/s, (3.54±0.93)×10-4 mm2/s. There were signiﬁcant statistical differences in ADC values of femoral head and femoral neck in different b values (P <0.05). Conclusion: This study obtained the ADC values ranges of femoral head and neck in normal adult. The results is useful for clinical application of DWI and provide a valuable reference value in scientiﬁc research work of femoral head diseases．]]></description>
<pubDate>Mon,20 Jun 2011 00:00:00  GMT</pubDate>
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<title><![CDATA[Extraction methods optimization in high-field MRS study of the human umbilical cord mesenchymal stem cells]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2011.06.008</link>
<description><![CDATA[Objective: To explore the suitable cell extraction methods that most ﬁt in vitro MRS study by analyzing the extraction efﬁciencies and detecting sensitivity, and to make some optimizations to the choice of different extraction procedures. Materials and Methods: Human umbilical cord mesenchymal stem cells were cultured and collected. The water-soluble metabolites were extracted by perchloric acid (PCA) and the lipid-soluble metabolites were extracted by methanol-chloroform (M/C), and we employed a dual phase extraction (DPE) procedure by methanol-chloroform-water to get both fractions from the same cell batch. The net weights from different extraction methods were compared and analyzed using Student paired t-test. Results: Compared with the net yields from DPE, the PCA extraction procedure has a higher efﬁciency in extracting water-soluble metabolites while M/C is efficient in extracting lipid-soluble metabolites. MRS is highly sensitive in detecting extremely small quantity of lipid-soluble metabolites. Conclusion: We can employ PCA combined with M/C to obtain both water- and lipid-soluble metabolites for the efﬁcient use of cells in MRS analysis.]]></description>
<pubDate>Mon,20 Jun 2011 00:00:00  GMT</pubDate>
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<title><![CDATA[Application of DWI for early diagnosis of spinal tuberculosis in Rabbits]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2011.06.009</link>
<description><![CDATA[Objective: To evaluate the renal oxygenation changes during acute unilateral ureteral obstruction in rats using blood oxygen level-dependent MR imaging (BOLD MRI) in 3.0 T MR. Materials and Methods: Sixteen healthy SD rats, 3 rats died because of anesthesia, 13 rats were performed kidney T2WI and coronal BOLD imaging respectively before UUO, 1 hour after UUO and 1 hour after release of UUO. Observed the signal and anatomical structure changes among the different groups of renal cortex and medulla, compared the SNR of renal parenchyma among three groups. BOLD images were reconstructed on 4.4 workstation, R2* values were determined in the cortex and medulla of the obstructed and the contralateral nonobstructed kidneys, then comparative analysis of R2*values of renal cortex and medulla among different groups. Compared with the rate of R2* values changes between the mild obstruction and severe obstruction; Analyze the relationship of relief group and no relief group with obstructions and R2* changes. Results: The SNR between left and right renal were the same, and renal anatomy was showed clearly before UUO. After UUO the SNR of 13 rats affected side renal was signiﬁcantly higher than before, the boundaries of cortex and medulla show blurry, and the pelviectasis in varying degrees. After release of UUO, the SNR higher than the obstruction former group, lower than the obstruction group, the boundaries got clearly, and the renal pelvis recovery in varying degrees. Before UUO, the R2* values of medulla was signiﬁcantly higher than that of renal cortex, but during the UUO was associated with a decreased R2* in medulla, and after release of obstruction the medulla R2* were increased slowly. The R2* showed no statistical difference in the cortex and nonobstructed kidneys among three groups. The rates of R2* change in mild obstruction slightly less than in severe obstruction. The obstruction and the R2* changes in relief group were lower than those in no relief group. Conclusions: 3.0 T BOLD MRI provides a useful tool in UUO which is associated with altered renal oxygen consumption.]]></description>
<pubDate>Mon,20 Jun 2011 00:00:00  GMT</pubDate>
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<title><![CDATA[Whole-Body MR/PET hybrid imaging: technical considerations, clinical workflow, and initial results]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2011.06.011</link>
<description><![CDATA[Researchers, radiologists, and nuclear medicine physicians have actively been working on the advent of the MR/PET hybrid imaging modality for a long time. Combined the excellent soft tissue contrast, high spatial and temporal resolution, and functional tissue parameters that MR provides with the high sensitivity of PET, this new imaging modality holds the promising application prospect for the clinical diagnosis. Recently, Siemens has launched a 3.0 Tesla whole-body MR hybrid system that hosts in its isocenter a fully integrated PET detector, which enables whole-body simultaneous MR/PET imaging. In this article, the integration techniques for the Biograph mMR system is shown, the workflow of a MR/PET whole-body hybrid exam and the first image examples from clinical findings are presented.]]></description>
<pubDate>Mon,20 Jun 2011 00:00:00  GMT</pubDate>
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<title><![CDATA[MR imaging of the common shoulder abnormalities]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2011.06.012</link>
<description><![CDATA[Shoulder disorders mainly involve rotator cuff diseases and shoulder instability. For rotator cuff diseases, routine shoulder MR imaging as the first choice can solve most of the problems in practice. For shoulder instability and related glenoid labrum lesions, shoulder MR arthrography is the first selection for evaluation. The purpose of this article is to illustrate the MR appearances of several common shoulder abnormalities, including the sub-acromial shoulder impingement syndrome, rotator cuff degeneration, partial-thickness and full-thickness rotator cuff tears, anterior instability, superior labrum antero-posterior tears, biceps related disorders, calcific tendinitis and bursitis, and adhesive capsulitis.]]></description>
<pubDate>Mon,20 Jun 2011 00:00:00  GMT</pubDate>
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<title><![CDATA[Iron overload measured by using T2* magnetic resonance imaging]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2011.06.013</link>
<description><![CDATA[Patients who had transfusion-dependent anemia can have substantial iron overload. Uncontrolled iron overload is association with significant mortality and disease complications. The accurate measurement of iron content is critical for clinical strategy. In this study, we detail current method of T2* weighted Magnetic Resonance Imaging (T2*-MRI) for quantifying iron in different organs or tissues. T2*-MRI increasingly and routinely is performed in clinical applications as a non-invasive method at present. However, there are still some remaining challenges and unsolved problems, such as artifacts, various measurements etc. With continuously and deeply exploring, T2*-MRI will have wide clinical applications in the future.]]></description>
<pubDate>Mon,20 Jun 2011 00:00:00  GMT</pubDate>
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