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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=201402</link>
<language>zh-cn</language>
<copyright>An RSS feed for Chinese Journal of Magnetic Resonance Imaging</copyright>
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<title><![CDATA[Olfactory deficit detected by fMRI in vascular dementia patients]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2014.02.001</link>
<description><![CDATA[Objective: The olfactory functional MRI (fMRI) was used to investigate the olfactory deficiency in the vascular dementia (VaD). Materials and Methods:  15 normal elderly people (NC group) and 12 VaD (VaD group) patients underwent MMSE, MOCA, CDR and Hachinsk grades. All subjects were scanned by Siemens 3.0 T MRI scanner, with 32 channel head coil, all olfactory fMRI data were processed with 64 bit Matlab 7.11.0 and SPM8 softwares. The independent samples t-test was used to analyze these two groups. Results: Inter-group analysis between two samples showed that the activated voxels in the whole brain of NC group were significantly higher than the VaD group, the activated area was mainly located in the frontal lobe, temporal lobe and the medial frontal gyrus. Conclusion: The VaD patients also suffered olfactory deficit, the olfactory fMRI can evaluate the olfactory function of VaD patients, which is a potential method to the study of the neurodegenerative diseases with olfactory deficit.]]></description>
<pubDate>Thu,20 Feb 2014 00:00:00  GMT</pubDate>
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<title><![CDATA[Evaluation of combined DTI and MRS to glioblastoma before and after radiotherapy]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2014.02.002</link>
<description><![CDATA[Objective: To discuss the value of diffusion tensor imaging (DTI) in combination with magnetic resonance spectroscopy (MRS) in glioblastoma before and after radiotherapy. Materials and Methods: 8 patients with recurrent glioblastoma confirmed by pathological method were selected to receive conventional MRI, contrast-enhanced scanning, DTI and MRS sequence scan before and after radiotherapy. The fractional anisotropy (FA) value, apparent diffusion coefficient (ADC) value metabolite ratios including NAA/Cr, Cho/Cr, Lip/Cr were measured according to different regions including tumor parenchyma, peritumoral edema. All the data were analyzed by paired-samples t test. Results: The ADC value of tumor parenchyma after radiotherapy increased compared to that before radiotherapy (t=3.320, P=0.013). Cho/Cr of tumor parenchyma after radiotherapy decreased compared to that before radiotherapy (t=2.960, P=0.021). Cho/Cr of peritumoral edema after radiotherapy decreased compared to that before radiotherapy (t=2.867, P=0.024). Conclusions: Combined application of DTI and MRS contribute to reflect changes post radiotherapy and can be used to monitor and evaluate the effect of radiotherapy.]]></description>
<pubDate>Thu,20 Feb 2014 00:00:00  GMT</pubDate>
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<title><![CDATA[The comparative study of CT and MRI about brain anatomic microstructure anomalous changes on assess and predict cerebral ischemia]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2014.02.003</link>
<description><![CDATA[Objective: To observe the degree of cerebral ischemia and to predict the acute cerebral ischemia that may be happen by studying the brain anatomic microstructure anomalous. Materials and Methods: Do the systematic reviews on 1786 cases with cerebral ischemia in our hospital nearly three years. The first CT images of 385 cases present normal or suspicious, and reexamination CT and MRI within 7 days. Results:  385 cases that be diagnosised normal or suspicious by the first CT images happened new infarction after reexamination CT/MRI within 7 days. The brain anatomic microstructure anomalous on the first CT images can predict the occur of acute cerebral ischemic events. In addition, 5 patients were diagnosised abnormal on the first CT images, and presented normal on MRI (DWI) images that reexamination in 24 hours and 30 hours respectively. Conclusion: To evaluate the existence of cerebral ischemia by using of CT/MRI imaging methods.]]></description>
<pubDate>Thu,20 Feb 2014 00:00:00  GMT</pubDate>
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<title><![CDATA[Comparison of fitting degree in monoexponential and biexponential model used to assess multi b-value DWI of renal parenchyma and CCRCC]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2014.02.004</link>
<description><![CDATA[Objective:To explore a more suitable mathematical model describing the signal change of renal parenchyma and clear cell renal cell carcinoma (CCRCC) induced from DWI with several b values. Materials and Methods: The images of  32 cases with CCRCC was analyzed retrospectively. Base on the conventional sequences, the signal intensity of renal parenchyma and CCRCC were measured, and the trends of signal intensity with several b values were fitted using two methods respectively, including monoexponential model (Group 1) and biexponential model (Group 2), and the quantitative index R2 was calculated. The R2 was compared between two groups using Wilcoxon test and between two tissues using Mann-Whitney test. Results: The signal intensity of two tissues declined with increased b values. The R2 was shown as median (75% CI). In tumor, the R2 is 0.97 (0.96, 1.00) in Group 1 and 1.00 (1.00, 1.00) in Group 2, and a significant difference was found (W=-253, P=0.00). In renal parenchyma, the R2 is 0.98 (0.98, 0.99) in Group 1 and 1.00 (1.00, 1.00) in Group 2, and there is a statistical difference (W=-528, P=0.00). And there are no differences between two tissues using each exponential modal (U=301.5, P=0.26, U=253.0, P=0.05, respectively). Conclusion: The biexponential function is a more suitable mathematical model for describing the signal change of renal parenchyma and CCRCC on DW imaging with several b values.]]></description>
<pubDate>Thu,20 Feb 2014 00:00:00  GMT</pubDate>
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<title><![CDATA[Comparison of IDEAL sequences in scanning protocols of brachial plexu]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2014.02.005</link>
<description><![CDATA[Objective: To compare display performances of the 3.0 T MRI for the IDEAL, 3D-FIESTA-c, and STIR sequences of the brachial plexas, and optimize the best scanning solution. Materials and Methods: 20 healthy volunteers were recruited and underwent bilateral brachial plexus MR scan coronally through MRI, including IDEAL sequence as well as comparative 3D-FIESTA-csequence and STIR sequence. SNR and CNR of the three sequences were compared respectively by subjective observation and objective measurements. Results: IDEAL sequence has stable and reliable fat suppression effect, and can obtain multiple contrasts. Compared with the STIR sequence, images displayed by the IDEAL sequences for the postganglionic segment of the brachial plexus has higher SNR and tissue contrast against the surrounding nerves, and the images of nerves are clearer and more accurate. However, displayed images for the preganglionic nerves a little weaker in sharpness and contrast compared with the 3D-FIESTA-c sequence, but it still meets the diagnostic requirements. Conclusion: IDEAL can be used as a substitute scanning sequence of the brachial plexus to replace the STIR and 3D-FIESTA-c sequences.]]></description>
<pubDate>Thu,20 Feb 2014 00:00:00  GMT</pubDate>
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<title><![CDATA[UTE-T2*mapping quantitative evaluation of lumbar cartilage endplate]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2014.02.006</link>
<description><![CDATA[Objective: To explore the feasibility of quantitative evaluation of lumbar intervertebral cartilage endplate using 3 dimensional multi-echo ultrashort echo time pulse sequence MR imaging. Materials and Methods: The images of lumbar cartilage endplate (CEP) were obtained from twenty one young volunteers by using multi-echo ultrashort echo time pulse sequence, and the image quality were evaluated from grade I to grade III in the order from poor to excellent. The T2* values of both upper and lower CEPs were measured at the lumbar artificial color maps from L1/L2 to L5/S1. Results: The 210 CEP images were graded as grade III. The average T2* value of upper and lower CEP was (19.76±8.41) ms, and (30.17±17.25) ms, respectively. The difference of CEP T2* value between upper and lower was statistically significant (t=-5.56, P<0.01). Conclusion: Three dimensional multi-echo ultrashort echo time pulse sequence MR imaging provides an effective approach for the quantitative study of lumbar CEP.]]></description>
<pubDate>Thu,20 Feb 2014 00:00:00  GMT</pubDate>
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<title><![CDATA[Mucoid degeneration of anterior cruciate ligament: MRI features and associated signs]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2014.02.007</link>
<description><![CDATA[Objective: The purpose of our study was to describe MR appearance and associated sings of anterior cruciate ligament mucoid degeneration. Materials and Methods: We reviewed 4540 knee MRI examinations in 3 years in our practice, all the knee MRI examinations were performed by two 1.5 T magnetic resonance machines. All the MR images were evaluated by two senior musculoskeletal radiologists by consensus. The diagnostic criteria for ligament mucoid degeneration and ganglia and intraosseous cysts based on the prior MRI features and arthroscopy. The incidence of ligament mucoid degeneration, MRI features of ganglion cyst (the size, complexity, location) and associated signs were recorded. Results: Of the 4540 knee MRI examinations, 34 (34/4540, 0.7%) had ACL mucoid degeneration, 13 (13/34, 38%) had discrete mucoid degeneration, and 21 (21/34, 62%) had features of both mucoid degeneration and ganglion cysts. Ganglia were located in the proximal ligament in  18 (86%) examinations and the distal ligament in 2 (9%) and involved the both proximal and distal ligament in 1 (5%). Ganglia ranged in maximum diameter from 6 to 30 mm (mean, 16 mm). 24 (24/34, 71%) cases had intraosseous cysts. 11 (11/34, 32%) cases present with severe osteoarthritis. Conclusions: Anterior cruciate ligament mucoid degeneration demonstrated characteristic “celery stalk sign” on MR imaging and commonly associated with ganglia and intraosseous cysts.]]></description>
<pubDate>Thu,20 Feb 2014 00:00:00  GMT</pubDate>
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<title><![CDATA[Application of MR 3D-PD-SPACE sequence in evaluation of ligaments and tendon of the ankle in healthy volunteer]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2014.02.008</link>
<description><![CDATA[Objective: To assess the value of MR 3D-SPACE sequence and conventional 2D-TSE sequence in evaluation of ligaments and tendon of the ankle in healthy volunteers. Materials and Methods: The ankles in 21cases were examined with MR imaging, including at coronal, sagittal, and axial postions 2D-fast spin echo-T2 Weighted imaging (2D-T2WI-FSE) and at sagittal position 3D-PD-SPACE. The signal noise ratio (SNR) of ligaments, tendon, cartilage, joint fluid and muscle, and the contrast noise ratio (CNR) of joint fluid-cartilage, fat-ligament and muscle-tendon were calculated. 2 radiologists independently assessed depiction of ligaments cartilage, joint fluid and tendons, as well as detection and grading of abnormalities of these structures (5-point Likert scale). The ability in visualization of artifacts, signal homogenity, partial volume effects and faintness were evaluated. Results: SPASE sequence provided a significantly higher SNR for all examined structures compared with conventional 2D sequence (P<0.01). SPASE sequence provided a significantly higher CNR for joint fluid-cartilage, joint fluid-ligament, joint fluid-fat and muscle-tendon compared with conventional 2D sequence (P<0.01). In imaging quality, SPACE sequence reconstructed imaging in displaying anterior talofibular ligament, calcaneofibular ligament, medial collateral ligament and calcaneonavicular ligament was better than conventional 2D sequence (P<0.05). At the same time, SPACE sequence reconstructed imaging in displaying extensor digitorum longus tendon, extensor pollicis longus, peroneus longus tendon, peroneus brevis tendon and flexor digitorum longus tendon was better than conventional 2D sequence. There was a significant difference between SPACE and conventional 2D sequence (P<0.05). Conclusion: 3D-PD-SPASE is a valuable technique for examination of ligament and tendon of ankle with multiplanar and curved reconstruction, which can provide more information for clinic.]]></description>
<pubDate>Thu,20 Feb 2014 00:00:00  GMT</pubDate>
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<title><![CDATA[Application of three-dimensional dynamic contrast-enhanced magnetic resonance angiography in diagnosing lower extremity arterial disease in patients with diabetic foot]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2014.02.009</link>
<description><![CDATA[Objective: To investigate the diagnostic value of three- dimensional dynamic contrast enhanced magnetic resonance angiography (3D CE-MRA) in lower extremity arterial disease (LEAD) of diabetic foot (DF). Materials and Methods: Fifteen diabetic cases suspected of LEAD underwent CE-MRA using 3D FLASH automatic subtraction sequence. Satisfactory lower extremity vasculars were obtained by post progressing techniques. All cases also underwent digital subtraction angiography (DSA) within one week. Stenosis grading of each segment of vascular is divided into three levels: grade A (normal/degree of stenosis < 50%), grade B (narrowed≥50%), C (block). The comprehensive diagnostic value of CE-MRA were analyzed taking DSA as the standard. Results: (1) In 15 cases, all target arteries were well demonstrated and the diagnosis was definite. (2) LEAD examined with CE-MRA were well consistent with that of DSA in DF cases (consistency check, Kappa value 0.944>0.75, P<0.05). Two medical imaging examination techniques have well consistency in diagnosing grade A and C of vascular stenosis (Kappa value 0.94, 0.84 respectively, both>0.75, both P<0.05). Two techniques have general consistency in diagnosing grade B of vascular stenosis (Kappa value 0.608, <0.75>0.4, P<0.05). (3) The positive of CE-MRA for lower extremity arterial stenosis was 96.0%, the false positive and false negative was 3.3%, 2.0% respectively;the sensitivity and specificity was 98.0%, 96.7% respectively. (4)The sensitivity of CE-MRA in diagnosing grade A, B, C of lower extremity artery stenosis of was 96.7%, 80%, 84.6% respectively, the specificity 98.0%, 92.9%, 97.1% respectively. Conclusions: 3D CE-MRA have well agreement with DSA in the positive and classification of stenosis degree for lower extremity arterial stenosis, especially grade A, C. It is unable to avoid false positives and false negatives, but CE-MRA might be performed as a routine examination method in diagnosing  LEAD of DF patients, with high sensitivity, high specificity, noninvasive, no radiation, no renal toxicity and quick scaning.]]></description>
<pubDate>Thu,20 Feb 2014 00:00:00  GMT</pubDate>
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<title><![CDATA[Relationships between 3.0 T MRI features and prognostic factors of patients in breast invasive ductal carcinoma]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2014.02.010</link>
<description><![CDATA[Objective: The aim of the current study was to correlate Magnetic resonance features with prognostic factors in breast invasive ductal carcinoma. Materials and Methods: 128 cases with primary breast invasive ductal carcinoma underwent magnetic resonance prior to surgery. Magnetic resonance features of breast cancer were determined based on the Breast Imaging and Reporting Data System (BI-RADS). MRI characteristics of our study included tumor shape, margin, type of enhancement, time to peak (Tpeak), Signal enhancement ratio (SER), Time intensity curve (TIC) and apparent diffusion coefficient (ADC), rADC. Histological specimens were analyzed after surgery for expression of estrogen receptor (ER), expression of progesterone receptor (PR), and expression of Her-2, Ki-67. These patients were all women, the mean age of them was 49±9.6 (ranging 28 to 76 years). All the patients had exactly the same MR sequences and parameters. The MRI scans were acquired with the patient prone position in a 3.0 T scanner (Magnetom Verio, Siemens Medical Solutions, Erlangen, Germany) equipped with a dedicated surface breast coil. All images were obtained in a workstation. Two breast radiologists retrospectively analyzed the imaging findings, and any discrepancy was resolved by consensus. Correlations between the MR features and prognostic factors were analyzed using the Spearman rank correlation. Logistic regression was performed for the analysis Spearman rank correlations to identify the most significant and independent MR image findings that were correlated with the prognostic factors. The above-mentioned statistical analyses were performed with SPSS 19.0. Results: Statistical analysis showed that Lobulate was associated with the negative expression of Ki67 (P=0.014).The rim enhancement of the mass was also associated with negative expression of ER (P=0.002), negative expression of PR (P=0.016). There was a significant association between the type III of TIC and the expression of Ki67 (P=0.012). Conclusions: To a certain extent there is some correlation among the MRI features, pathology, and prognostic factors in breast invasive ductal carcinoma. The biological behavior and prognosis of breast invasive ductal carcinoma be assessed based on MRI features. Lobulate shape,rim enhancement and the type III of TIC of the breast invasive ductal carcinoma were associated with a poor prognosis.]]></description>
<pubDate>Thu,20 Feb 2014 00:00:00  GMT</pubDate>
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<title><![CDATA[Biological characteristics and MR imaging features of SPIO labeled BMSCs in vitro]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2014.02.011</link>
<description><![CDATA[Objective: To observe the biological characteristics of rat bone marrow mesenchymal stem cells (BMSCs) labeled by superparamagnetic iron oxide (SPIO) in vitro, and to observe the magnetic resonance imaging (MRI) features of labeled BMSCs in vitro. Materials and Methods: BMSCs were isolated and cultured by plastic adherence method. The BMSCs of the fourth passage were identified by specific surface antigens by flow cytometr. BMSCs were labeled with SPIO of different concentrations. Trypan blue staining and MTT test to evaluate the effects of SPIO on cell labeling efficiency, cell viability and cell proliferation. The MRI imaging features of labeled BMSCs were observed by MRI scanning. Results: The labeling efficiency of all SPIO groups was about 99%. BMSCs labeled with SPIO-PLL at the concentrations (25, 50 μg/ml SPIO, and 0.75 μg/ml PLL), Cell viability rates were about 95%. While at the concentration of SPIO (75, 100 μg/ml), cell viability rate was 92.7% and cell proliferation was significantly inhibited (P<0.05). On MRI imaging, with the concentration of SPIO increasing, signal intensity decreased gradually. When SPIO concentration ≥50 μg/ml, T2 signal intensity of labeled cells compared with normal BMSCs were significantly different (P<0.05). Conclusions: The appropriate concentration of SPIO could not influence on cells biological characteristics. MRI scanning can show the SPIO nanoparticles labeled rat BMSCs significantly and effectively.]]></description>
<pubDate>Thu,20 Feb 2014 00:00:00  GMT</pubDate>
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<title><![CDATA[Clinical application of three-dimensional MR angiography using time-resolved imaging of contrast kinetics]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2014.02.012</link>
<description><![CDATA[Objective: To investigate the value of MR angiography using time-resolved imaging of contrast kinetics (TRICKS) in clinical practice. Materials and Methods: 60 patients performed TRICKS in our hospital were enrolled in this study. Masks were scanned before TRICKS and 15-20 phases were acquired after contrast agent bonus injection. Results: All 60 patients completed TRICKS and images met diagnostic requirements. 11 cases of intracranial angiography had good image quality, including arteriovenous malformation (n=6), scalp arteriovenous malformation (n=2) and venous sinus thrombosis (n=3). 5 cases of cervical angiography displayed well including bifurcation of carotid artery stenosis (n=3), left vertebral artery stenosis (n=1) and neurofibroma (n=1). 10 cases of spinal vascular malformation showed well on TRCIKS. Upper limbs angiography displayed 5 cases hemangioma. 22 cases of lower limbs and foot angiography showed arteriovenous fistula (n=10), pseudoaneurysm (n=1), lower limbs vascular occlusion in patients with diabetes mellitus (n=3) and lower limbs arteries stenosis (n=8). 2 cases of iliac osteosarcoma, 3 cases of femur osteosarcoma and 2 cases of fibroma showed well on pelvic TRICKS (n=7). Conclusions: TRICKS is able to describe clearly vascular system and demonstrate lesions by many aspects. It plays an important role in the non-invasive diagnosis of vascular diseases, for its high temporal resolution and accuracy.]]></description>
<pubDate>Thu,20 Feb 2014 00:00:00  GMT</pubDate>
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<title><![CDATA[Marrow fat quantification by magnetic resonance technology: the aplication and prospect in bone diseases]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2014.02.014</link>
<description><![CDATA[Fat occupies a signiﬁcant portion of bone cavity and is one of the important factors which affect the bone marrow microenvironment. Various physiological or pathological changes of the bone marrow are closely related with the fat content thus we may detect the bone marrow lesions or evaluate its functional status by quantifying bone marrow fat with certain magnetic resonance methods. This paper reviewed the applicationgs in bone diseases different MR techniques for bone adipose tissue measurement in recent decades, and the application prospect of this technology is forecasted.]]></description>
<pubDate>Thu,20 Feb 2014 00:00:00  GMT</pubDate>
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<title><![CDATA[Statistical analyses most commonly used in SCI-indexed journals of radiology]]></title>
<link>http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2014.02.015</link>
<description><![CDATA[The purpose of this review article is to familiarize radiologists with most commonly used statistical analyses in studies published in science citation index (SCI)-indexed journals of radiology. The review is based on the (co-)authors’ skill of writing articles concerning prostate tumor, renal cancer, hepatic tumor, lung cancer, esophagus tumor, brain tumor and lymphoma.]]></description>
<pubDate>Thu,20 Feb 2014 00:00:00  GMT</pubDate>
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