Comparison of ZOOMit-DWI sequence and conventional DWI sequence in endometrial cancer / 中南大学学报(医学版)

OBJECTIVES@#Magnetic resonance diffusion-weighted imaging (DWI) has important clinical value in diagnosis and curative effect evaluation on endometrial carcinoma. How to improve the detection rate of endometrial small lesions by DWI is the research focus of MRI technology. This study aims to analyze the image quality of small field MRI ZOOMit-DWI sequence and conventional single-shot echo-planar imaging (SS-EPI) DWI sequence in the scanning of endometrial carcinoma, and to explore the clinical value of ZOOMit-DWI sequence.@*METHODS@#A total of 37 patients with endometrial carcinoma diagnosed by operation and pathology in the Second Xiangya Hospital of Central South University from July 2019 to May 2021 were collected. All patients were scanned with MRI ZOOMit-DWI sequence and SS-EPI DWI sequence before operation. Two radiologists subjectively evaluated the anatomical details, artifacts, geometric deformation and focus definition of the 2 groups of DWI images. At the same time, the signal intensity were measured and the signal-to-noise ratio (SNR), contrast to noise ratio (CNR), and apparent diffusion coefficient (ADC) of the 2 DWI sequences were calculated for objective evaluation. The differences of subjective score, objective score and ADC value of the 2 DWI sequences were analyzed.@*RESULTS@#The SNR of the ZOOMit-DWI group was significantly higher than that of the SS-EPI DWI group (301.96±141.85 vs 94.66±41.26), and the CNR of the ZOOMit-DWI group was significantly higher than that of the SS-EPI DWI group (185.05±105.45 vs 57.91±31.54, P<0.05). There was no significant difference in noise standard deviation between the ZOOMit-DWI group and the SS-EPI DWI group (P>0.05). The subjective score of anatomical detail and focus definition in the ZOOMit-DWI group was significantly higher than that of the SS-EPI DWI group (both P<0.05). The subjective score of artifacts and geometric deformation of ZOOMit-DWI group was significantly lower than that of the SS-EPI DWI group (both P<0.05). ADC had no significant difference between the ZOOMit-DWI group and the SS-EPI DWI group (P>0.05).@*CONCLUSIONS@#The image quality of ZOOMit-DWI is significantly higher than that of conventional SS-EPI DWI. In the MRI DWI examination of endometrial carcinoma, ZOOMit-DWI can effectively reduce the geometric deformation and artifacts of the image, which is more conducive to clinical diagnosis and treatment.

Renal angiomyolipoma with inferior vena cava and right atrial embolism: A case report and literature review / 中南大学学报(医学版)

Renal angiomyolipoma (AML) with renal vein, inferior vena cava (IVC), and right atrial embolism is a rare solid tumor, whose etiology and pathogenesis are still unclear. Moreover, it is often misdiagnosed. One patient with renal AML complicated with renal vein, IVC, and right atrial embolism was admitted to the Second Xiangya Hospital of Central South University, who was a 35-year-old female, without any previous medical history, presented with right low back pain for more than 3 years. Computed tomography (CT) scan showed irregular lobulated fatty density mass in the right kidney, renal vein, IVC, and right atrium. The contrast-enhanced scan showed no enhancement of fat components at each phase and mild enhancement of solid components. Radical resection of the right kidney and removal of tumor thrombus were performed, and there was no recurrence 1 year after the operation. It is rare for renal AML to grow along the renal vein, IVC, and extend to the right atrium. Imaging examination is extremely important, and the CT findings of this case are characteristic, but the diagnosis eventually depends on pathological and immunohistochemical examinations.

EvaluationoftheneoadjuvantchemotherapyforlocallyadvancedcervicalcancerusinghighresolutionRESOLVEDWI / 实用放射学杂志

Objective Toevaluatetheefficacyofneoadjuvantchemotherapy(NACT)forlocallyadvancedcervicalcancer(LACC) byusinghighresolutionRESOLVE DWIsequence..Methods 34patientswithLACCconfirmedbypathologyunderwentroutine plainandenhancementMRscanandRESOLVE DWIscan withbvalueof0 mm2/s,1000 mm2/sbeforeNACT,afterthefirst chemotherapy(2.5weekslater)andthesecondchemotherapy(5weekslater).TheADCvaluewascalculated.Thetumorvolumewas calculatedusingtumorsegmentationsoftware.Therateoftumorwithdrawalwascalculatedinthemiddle(2.5weeksafterthefirst chemotherapy)andlatestages(2.5weeksafterthesecondchemotherapy),whichwerejudgedaccordingtotheRECIST1.1standard. Results In29patientsofeffectivetreatment,theADCvaluesoftheLACCsignificantlyincreasedfrompre-chemotherapy[(0.887± 0.14)×10-3 mm2/s]toafterthefirstchemotherapy [(0.974±0.12)×10-3 mm2/s]andsecondchemotherapy [(1.023±0.17)× 10-3 mm2/s](t=2.403 ,P<0.05;t=3.397,P<0.05).Theratesoftumorwithdrawalsignificantlyincreasedfromthefirstchemotherapy (58.21%±20%)tothesecondchemotherapy(77.60%±12%)(t=4.297,P<0.05)I.n5casesofineffectivetreatment,theADCvaluesofthe LACCshowedadownwardtrendfrompre-chemotherapy[(0.867±0.06)×10-3 mm2/s]toafterthefirstchemotherapy[(0.848±0.16 )× 10-3 mm2/s]andsecondchemotherapy [(0.842±0.15)×10-3 mm2/s](t=0.934,P=0.378;t=0.886,P=0.401).Theratesof tumorwithdrawalshowedadownwardtrendfromthefirstchemotherapy(14.14%±15%)tothesecondchemotherapy(-21.22%±13%) (t=1.003,P=0.345).Conclusion TheADCvalueofRESOLVEDWIandtherateoftumorwithdrawalmaybeusedtoevaluatethe efficacyofNACTforthepatientswithLACC,whichwouldhavegoodclinicalpracticalvalue.

Effect of temperature for tumescence anesthesia solution on intraoperative and postoperative pain of endovenous laser ablation of lower extremity varicose vein / 中南大学学报(医学版)

To compare the effect of cold or room temperature of tumescence anesthesia solution on pain perception during and after endovenous laser ablation (EVLA) for varicose veins of lower limb.
 Methods: A total of 51 patients with lower extremity varicose vein were treated by EVLA with tumescence anesthesia solution. All patients were used for local anesthesia and randomly divided into 2 groups according to the temperature of tumescence anesthesia solution: Group A (n=26) with room temperature (24 ℃) of tumescence anesthesia solution and Group B (n=25) with cold (4 ℃) tumescence anesthesia solution. Number rating scale (NRS) was recorded immediately after the procedure and postoperative 1, 2, 3 day. Patients were asked to register pain scores during the week.
 Results: The mean linear endovenous energy density (LEED) in the 2 groups was not significantly different (P>0.05). The ratio of patients without pain during the operation in the Group A was lower than that in the Group B (30.8% vs 64%, P<0.05). On the day of operation and postoperative day 1, 2, 3, the average number rating scale (NRS) scores in the Group A were greater than those in the Group B (P<0.05). Postoperative day 1, only 30.8% of the patients in the Group A resumed daily activities, which was lower than that (68% of the patients) in the Group B.
 Conclusion: In the process of EVLA for varicose veins of lower limb, there is less pain during operation and post-operation using cold tumescence anesthesia solution comparing room temperature tumescence anesthesia solution.

Role of functional magnetic resonance imaging in evaluating the therapeutic effect of transcatheter arterial chemoembolization in hepatocellular carcinoma / 临床肝胆病杂志

Transcatheter arterial chemoembolization (TACE) is the first-line treatment for unresectable hepatocellular carcinoma (HCC). Postoperative follow-up helps to determine tumor survival and necrosis timely and accurately and plays an important role in evaluating therapeutic outcome, guiding future treatment, and reducing pain. This article introduces the application of functional magnetic resonance imaging, including magnetic resonance spectroscopy, magnetic resonance perfusion weighted imaging, diffusion weighted magnetic resonance imaging, intravoxel incoherent motion, and blood oxygen level-dependent magnetic resonance imaging, in observing the changes in metabolism, blood flow, energy, and blood oxygen in tumor cells and points out that functional magnetic resonance imaging has promising prospects in evaluating the therapeutic effect of TACE in HCC.

Imaging manifestations and pathologic basis for hepatic capsular retraction syndrome caused by benign and malignant liver tumors / 中南大学学报(医学版)

OBJECTIVE@#To investigate the imaging manifestations of CT, MRI and pathological basis for hepatic capsular retraction syndrome caused by benign and malignant liver tumors.
@*METHODS@#CT or MRI images and pathological features for hepatic capsular retraction syndrome were retrospectively analyzed in 50 patients with benign and malignant liver tumors. Picture archive and communication system (PACS) was used to observe and compare the morphology, size, width, depth, edge of the capsular retraction and the status of liquid under the liver capsule. The structure, differentiation and proliferation of the tumor were analyzed under the microscope.
@*RESULTS@#There were malignant liver tumors in 44 patients and benign tumor in 6 patients. The smooth or rough for the edge of capsular retraction was significant difference between the benign tumors and the malignant tumors with three differentiated grades (all P<0.05). There were significant difference in the width and depth for capsule retraction with different amount of fibrous tissues (all P<0.05). The width and depth of capsule retraction were positively correlated to the size of the tumors (r=0.557, 0.309 respectively, both P<0.05).
@*CONCLUSION@#Benign and malignant hepatic tumors may appear capsule retraction syndrome, but there are morphological differences between them. The differences are closely related with the lesion size, differentiated degree of tumor and fibrous tissue proliferation.

MRI manifestation of xanthomatous hypophysitis: a case report and review of the literature / 中南大学学报(医学版)

The inflammatory lesion of the pituitary gland is unusual. A 33-year-old woman with headache, visual impairment, and menelipsis was admitted to the Second Xiangya Hospital, Central South University. The results of magnetic resonance imaging (MRI) for pituitary gland showed a sellar mass with iso-intensity on T1 weighted imaging and high signal on T2 weighted imaging. The homogeneous lesion was enhanced on contrast MRI. The pituitary stalk was thickened accompanied by the cavernous sinus invasion, which showed a "triangle" saddle occupation on the MRI coronal plane. An endocrinological examination revealed mild hypocortisolism. Th e patient was diagnosed as pituitary adenoma based on the MRI findings and endocrinological examination. Trans-sphenoidal surgery was performed. The intra-operative histological examination also suggested a pituitary adenoma. Th e histopathological examination showed accumulation of foamy cells and xanthomatous epithelioid cells, supporting the diagnosis of xanthomatous hypophysitis. Xanthomatous hypophysitis possesses certain MRI features. Th e most typical imaging features are the thickening of the pituitary stalk and the sign of "triangle" occupation on MRI coronal plane, which are very helpful to the correct diagnosis and optimal management.

The safety of percutaneous transhepatic intraductal radiofrequency ablation for the treatment of malignant biliary obstruction: recent progress in research / 介入放射学杂志

At present, the percutaneous transhepatic cholangiodrainage (PTCD) and the self-expandable metal stent implantation are commonly recognized as an effective treatment for inoperable malignant biliary obstruction, but the restenosis of biliary stent significantly affect the therapeutic result and prognosis.Percutaneous transhepatic intraductal radiofrequency ablation can be used together with biliary stent implantation, which can prolong the patency time of biliary stent and control the local tumor at the narrowed segment, thus, the therapeutic effect of malignant biliary obstruction can be reliably improved. As a kind of newly-developed therapy, its clinical safety is especially important. This paper aims to make a review about the safety of percutaneous transhepatic intraductal radiofrequency ablation combined with biliary stent implantation in treating malignant biliary obstruction.

Preparation and biomedical application of superparamagnetic iron oxide / 中国组织工程研究

BACKGROUND:Superparamagnetic iron oxide has been widely used in biomedical applications, especialy in the field of targeted diagnosis and therapy. OBJECTIVE:To summarize the physicochemical property, preparation, surface modification, product testing and biomedical applications of superparamagnetic iron oxide. METHODS: In order to search relevant articles about the physicochemical property and biomedical applications of superparamagnetic iron oxide from PubMed, Sciencedirect, CNKI and Wanfang databases (from 2000 to 2014), a computer-based search was performed using the keywords of “superparamagnetic iron oxide, preparation, coprecipitation, surface modification, magnetic resonance imaging contrast agent, fluorescent tracing, targeted therapy” in English and Chinese, respectively. RESULTS AND CONCLUSION: The superparamagnetic iron oxide can be produced in the laboratory, and the preparation methods include hydrothermal method, vapor deposition method, mechanical miling method, liquid-phase microwave dielectric heating method, sol-gel method, emulsion method, co-precipitation method. Moreover, the superparamagnetic iron oxide can have different properties by surface modification and be applied in many biomedical fields, such as magnetic resonance contrast agent, fluorescent tracer, nanoparticle targeted therapy, hyperthermia and bioseparation.

Crazy paving pattern caused by pulmonary alveolar proteinosis: CT findings and the pathologic basis / 中南大学学报(医学版)

OBJECTIVE@#To explore CT findings and pathologic basis of crazy paving pattern caused by pulmonary alveolar proteinosis.@*METHODS@#Twenty-four patients who were diagnosed pathologically as pulmonary alveolar proteinosis by transbronchial lung biopsy and bronchoalveolar lavage fluid from June 2006 to May 2012 were included in this retrospective study. All patients underwent a 64-slice CT of the lungs.@*RESULTS@#CT findings: crazy paving pattern was observed on CT imaging of all 24 patients. In 23 patients, crazy paving pattern displayed strip-shaped opacities with smooth edges, and there was a clear boundary between the pathological and normal lung tissues. The reticular opacities were connected with peripheral blood vessels and the branches were formed, and their diameters decreased slightly. Microscopically, hemangiectasis were seen in 17 patients.@*CONCLUSION@#Crazy paving pattern caused by pulmonary alveolar proteinosis displayed clear edges, and smooth reticular opacities, most of which were due to hemangiectasis of interlobular, interacinar and interalveolar septa. These findings of CT are helpful for the specific diagnosis of pulmonary alveolar proteinosis.

High field magnetic resonance background suppression diffusion imaging in the diagnosis of liver foci of space occupying lesion / 中南大学学报(医学版)

OBJECTIVE@#To explore the diagnostic value of the 3.0T magnetic resonance liver diffusion weighted imaging with background suppression (DWIBS) in liver foci of space occupying lesion.@*METHODS@#A total of 43 cases of liver bureau stove perch pathological change were included: 15 were hepatocellular carcinoma (HCC) with 24 lesions; 7 were liver metastatic tumor with 13 lesions; 10 were liver hemangioma with 12 lesions; and 11 liver cyst with 20 lesions. After taking the conventional T1WI and T2WI sequence, the magnetic resonance background suppression diffusion imaging technology (diffusion weighted imaging with background suppression, DWIBS) was applied, following the dynamic enhanced scan. With the MRI to DWIBS workstation for classifying positron emission computed tomography (PET) processing, the T2WI diagram and dynamic enhanced diagram were compared respectively for the 3 sequences of lesion detection rate, T2WI, and DWIBS, to enhance the delay time between the two joint and combined lesion detection rate. With the MRI workstation software scanning image generation ADC diagram, the ADC values were measured for liver cancer, liver metastatic tumor, liver hemangioma and liver cysts.@*RESULTS@#The 3 sequences of detection rates of the T2WI, DWIBS and enhanced delay period T1WI were 91.3%, 94.2%, and 95.6%. The detection rate of DWIBS plus T2WI was 92.7%; that of T2WI plus enhanced delay time was 94.9%, and that of DWIBS plus enhanced delay time was 96.3%, with the rate of DWIBS plus enhanced delay period obviously higher than that of the DWIBS plus T2WI (P<0.05). The ADC value of the benign liver tumor was obviously higher than that of the malignant tumors: hepatic cyst (2.614 ± 0.57)×10⁻³ mm²/s, liver hemangioma (2.055 ± 0.21)×10⁻³ mm²/s, metastatic carcinoma (1.374 ± 0.32)× 10⁻³ mm²/s, and liver cancer (1.287 ± 0.14)×10⁻³ mm²/s. Except for the liver cancer and the liver metastatic tumor, there was significant difference between the other groups (P<0.05).@*CONCLUSION@#Combing the DWIBS technology, the PET-like images and the ADC value acquired, the combined enhanced sequences could further facilitate the demonstration of the liver foci of space occupying lesion, the accuracy of identification and diagnosis of the liver foci of space occupying lesion.

MR subtraction in the differentiation of benign and malignant tumors / 中南大学学报(医学版)

OBJECTIVE@#To evaluate dynamic contrast-enhanced MRI in conjunction with MR subtraction in the differential diagnosis of benign and malignant breast tumors at 3 Tesla.@*METHODS@#A total of 78 patients with breast tumors enrolled in this study, including 45 malignant lesions and 33 benign lesions verified by histopathology. Dynamic MR contrast enhanced imaging was done by T1 high resolution isotropic volume excitation sequence. MR subtraction was used to retrospectively analyze the MR dynamic image. A dynamic phase subtraction (DPS) map is a map image with pixel-by-pixel subtraction of an early-phase image from a delayed maximum enhancement phase image obtained in a dynamic study. The sensitivity and specificity were calculated with or without subtraction in the diagnosis of benign and malignant breast tumors.@*RESULTS@#The sensitivity of benign breast masses increased from 0.879 to 0.939, and the specificity increased from 0.818 to 0.909 with reference to the DPS map. There was statistical difference between with or without DPS (Z=2.023, P=0.043). The sensitivity of breast malignant masses increased from 0.889 to 0.933, and the specificity increased from 0.867 to 0.911 with reference to the DPS map, with statistical difference between with or without DPS map (Z=2.294, P=0.021). The pattern of TIC changed from continuous to a plateau in 8 patients, from a plateau to washout in 10, and from continuous to washout in 5. No changes were observed in the other 55 patients.@*CONCLUSION@#MR Subtraction is a simple and useful technique to identify breast lesions. It helps to accurately set the location of the ROI TIC and improve the detection rate of benign and malignant breast tumors.

Lung MRI at 3T：comparison of CT and MRI in initial evaluation of pulmonary alveolar proteinosis / 中南大学学报(医学版)

Objective:To explore whether the phospholipidoproteinaceous material deposit within the alveoli by a high-ifeld 3T MRI has signal characters and its application for diagnosing pulmonary alveolar proteinosis.Methods:A total of 11 patients with pulmonary alveolar proteinosis previously diagnosed by ifberoptic bronchoscope lung biopsy underwent 64-slice helical CT scans and 3T MRI scans, and the CT scans and the MRI scans were compared. Results:hTe phospholipidoproteinaceous material deposit within the alveoli presented longer or equal T1 relaxation time and longer T2 relaxation time, without characters of fatty or deposits of protein-like substance signals and enhancement. The distribution, form, number and size of the lesions at T2WI were almost the same as those at CT, the lesions were irregular in morphology, and there was a clear boundary between the lesions and the adjacent normal lung tissues. Dynamic contrast-enhanced MRI showed thickened pulmonary arteriolae and venulae in the lesions with more obviously thickened pulmonary venulae, which were in conformity with the pulmonary artery and venule enhancement. CT scan in 1 out of the 11 cases showed lesions in both lungs mainly consisted of stripe-shaped and reticular structures, and no obvious sign of pulmonary alveolar proteinosis residue was found. MRI scan detected alveolar proteinosis that failed to be shown by CT scan. Conclusion:3T MRI T2WI can easily detect the lesions of long T2 signals formed by the lipoproteinaceous material deposit within the alveoli. In the lesions, geographic appearance was presented, and the crazy paving pattern was dimly visualized. MRI can relfect the morphological characters of PAP like CT and it is slightly better compared with CT in such aspects as evaluating the theraputic effect of lung lavage. As supplement to CT, high-field 3T MRI can serve as an important examination for lung diseases.

Comparative study of PBL and LBL in medical imaging practice teaching / 中华医学教育探索杂志

Objective To investigate the application of PBL and LBL teaching in medical imag-ing teach-ing. Methods Totally 124 five-year clinical students were divided into two groups:PBL teaching (n=57)and LBL teaching(n=67). Teaching in PBL group was conducted through the following 6 proce-dures:grouping-giving cases-asking questions-establishing hypothesis-collecting data-hypoth-esis testing-team summarizing. Teaching in LBL group was conducted mainly by teachers with multime-dia, course-ware,wall charts,models,samples,etc and finally summarized by teachers. Effect was eval-uated by reading test,closed-book exam and questionnaire survey. t test was employed to do statically analysis,with P≤0.05 being statistical differences. Results Reading test score ((82.4±14.8)vs (74.5±9.7))and case analysis score((13.9±5.1)vs (10.2±6.1))were higher in PBL group than in LBL group(P≤0.05). Most students in PBL group appreciated the teaching method. Conclusions PBL teaching can help improve the clinical analysis of students and is welcomed by students. Moreover, PBL,as a supplement of traditional teaching,can initiate the learning interests and enhance the innova-tion of students.

Characteristic CT findings and pathologic basis of ground glass opacity caused by pulmonary alveolar proteinosis / 中南大学学报(医学版)

OBJECTIVE@#To explore characteristic CT findings and pathologic basis of ground glass opacity caused by pulmonary alveolar proteinosis (PAP).@*METHODS@#Retrospective analysis of CT and pathological findings of 24 patients with PAP who were pathologically diagnosed from June 2006 to August 2011.@*RESULTS@#Findings with CT: the lesions of the 24 patients mainly presented ground glass opacities. Local consolidations were seen in 8 patients. In 23 patients part of ground glass opacities bordered strip-shaped opacities with smooth edges, and there was a clear boundary between them and the bordering normal lung tissues, presenting a geographic appearance. Lesions in the 5 cases were mixed with alveoli or lobule aerocele, which made ground glass opacities present curved edges. Crazy paving pattern was detected in the 24 patients. Microscopically, the alveoli were seen to be filled with floccules proteinaceous material in various quantities in the 24 patients; hemangiectasis and congestion were seen in 17 patients, and enlarged alveolar cavities were seen in 5 patients.@*CONCLUSION@#PAP usually causes ground glass opacities with clear edges, and different from ground glass opacities with obscure edges caused by other pulmonary diseases. They are relatively specific to the imagining diagnosis to PAP.

Quantitative studies on the dynamically apparent diffusion coefficient of MR diffusion weighted imaging in the rabbit VX-2 tumor model / 中国医师杂志

Objective To investigate dynamically characteristics of apparent diffusion coefficient (ADC) of MR diffusion-weighted imaging (DWI) in the rabbit VX-2 tumor model.Methods Forty New Zealand rabbits were included in the study and forty-seven rabbit VX-2 tumor models were raised by implanting directly and intrahepatically after abdominal cavity was opened.DWI was carried out periodically and respectively on seventh,fourteenth,and twenty-first day after implantation.Part samples of VX-2 tumors were studied by pathology.The distinction of VX-2 tumors on DWI was assessed by their ADC values.The statistical significance between different time groups,different area groups,or different b-value groups was calculated using SPSS12.0 software,respectively.Results ADC values of 47 VX-2 tumors in the area of tumor periphery,tumor center,and normal parenchyma around tumor were greater when b-value was 100 s/mm2 than those when b-value was 300 s/mm2 and the distinction of VX-2 tumor ADC in the area of tumor periphery,tumor center,and normal parenchyma around tumor between different b-value groups was significant,respectively( F =17.964,P ＜0.01 ; F =13.986,P ＜0.01 ; F =128.681,P ＜0.01 ).The ADC values in the area of normal liver parenchyma around tumor were greater than those in the area of VX-2 tumor periphery and tumor center when the b-value was 100 or 300 s/mm2.When b-value was the same( 100 or 300 s/mm2),the distinction of VX-2 tumor ADC between different areas was significant( F =176.586,P ＜0.01 ; F =55.089,P ＜0.01 ).The ADC of VX-2 tumor in the area of tumor periphery and tumor center became gradually low from seventh to fourteenth or twenty-first day after implantation and the distinction of ADC between different time groups but the area same (?) was significant( b =100 s/mm2,F =48.211,P ＜0.01 ;b =300 s/mm2,F =20.955,P ＜0.01 ).There were not obvious cellular necrosis in VX-2 tumors on seventh and fourteenth day after implantation but ADC of VX-2 tumor decreased unobviously because of cellular edemata in or around tumors.There were obvious cellular necrotic areas in VX-2 tumors on the twenty-first day after implantation.ADC of viable tumor cells in VX-2 tumors were lower on DWI than that in the area of normal liver parenchyma around tumor and ADC of dead tumor cells in VX-2 tumors were unequal,including high values,equal values,and low values but they were higher than that in the area of normal liver parenchyma around tumor after dead tumor cells had been liquified or had become cystic.Conclusions ADC is able to reflect objectively the diffusion of water molecules in the tumor and to reflect indirectly the degree of the growth and liquified necrosis of a tumor.ADC has an important and potential value in monitoring dynamical tumor growth and in evaluating malignant degree and therapeutic effect.

Study on the dynamic characteristics and pathological mechanism of magnatic resonance diffusion weighted imaging after chemoembolizaiton in rabbit liver VX-2 tumor model / 中国医师杂志

ObjectiveTo investigate its dynamic characteristics and pathological mechanism on magnatic resonance diffusion weighted imaging (DWI) after chemoembolization in rabbit liver VX-2 tumor model.MethodsForty New Zealand rabbits were included in the study and forty-seven rabbit VX-2 tumor models were raised by implanting directly and intrahepatically after abdominal cavity was opened.Forty VX-2 tumor models from them were divided into four groups.DWI was performed periodically and respectively for each group after chemoembolization.All VX-2 tumor samples of each group were studied by pathology.The distinction of VX-2 tumors on DWI was assessed by their apparent diffusion coefficient (ADC) values.The statistical significance between different time groups,different area groups,or different b-value groups was calculated using SPSS 12.0 software.ResultsWhen b-value was 100 s/mm2,ADC values in the area of VX-2 tumor periphery,VX-2 tumor central,or normal liver parenchyma around tumor became gradually low in sixteen hours after chemoembolization,and were the lowest at sixteenth hour,and then they increased gradually from sixteenth hour to fourty-eighth hour after chemoembolization.The distinction of ADC between different time groups was significant,respectively ( F =7.325,P ＜ 0.01 ; F =2.496,P ＜ 0.05 ; F =6.856,P ＜0.01 ).Cellular edema in the area of VX-2 tumor periphery or normal liver parenchyma around tumor increased quickly in sixteen hours after chemoembolization; however,from sixteenth hour to forty-eighth hour,cellular edema in the area of normal liver parenchyma around tumor decreased gradually and that in the area of VX-2 tumor periphery decreased lightly at first and then increased continually.Cellular necrosis in the area of VX-2 tumor periphery after chemoembolization was more significant than that before chemoembolization.The areas of dead cells in VX-2 tumors manifested low signal and high ADC value while the areas of viable cells manifested high signal and low ADC value.ConclusionsDWI is able to detect and discriminate tumor necrotic areas from viable cellular areas before and after chemoembolization.ADC of normal liver parenchyma and VX-2 tumor are influenced by intracellular edema,tissue cellular death,and microcirculation disturbance after chemoembolization.

Magnetic resonance perfusion imaging before and after transcatheter arterial chemoembolization treatment of hepatocellular carcinoma / 中国医学影像技术

Objective To observe the change of MR perfusion value in patients with hepatocellular carcinoma (HCC) before and after transcatheter arterial chemoembolization (TACE). Methods A total of 22 patients with HCC underwent MR perfusion weighted imaging (MR PWI) before TACE and 3-10 days after TACE. The mean time to enhance (MTE), negative enhancement integral (NEI), time to peak (TTP) and maximum slope of decrease (MSD) before and after TACE were acquired and compared. Results The time intension curve (TIC) of HCC region was observed to descend rapidly before TACE, while descended slowly after TACE. The value of MTE and TTP after TACE were lower than those before TACE (P0.05). Conclusion MR PWI is a very sensitive imaging technique that be used to monitor blood flow changes of HCC before and after TACE and evaluate efficacy of TACE.

MR perfusion imaging of the liver: early findings after transcatheter arterial chemoembolization of hepatocellular carcinoma / 中华放射学杂志

Objective To investigate the value of MR perfusion imaging in early detection of findings following arterial chemoembolization of hepatocellular carcinoma Methods Twenty eight consecutive patients with pathologically-confirmed HCC were evaluated. All patients underwent MR perfusion imaging at pre-TACE and 3 to 10 days after TACE. The negative enhancement integral (NEI) ,the time to peak(TTP) ,the maximum slope of decrease (MSD) , the signal enhance ratio (SER) were acquired from MRI software FuncTool 2. 5.36a Version. Statistical analysis using SPSS 14, least significant difference test (t test) were utilized. Results The time intensive curve of tumor was observed to descend rapidly to reach the peak at pre-TACE studies, whereas it descended slowly to reach the peak on post TACE studies. The Value of TTP and SER prior to TACE were(51.2 ± 10. 3) s, 60. 6 ± 36. 3 respectively, and post TACE (43.7 ± 12. 0)s, 41.2 ±27. 5 respectively. The values of TTP and SER post TACE were lower than those prior to TACE (P ＜ 0. 05). The value of NEI prior to TACE was 108.7 ± 58.9, and after TACE 149. 6 ±80. 1 and there was statistically significant difference (P ＜0. 05). The Value of MSD post TACE were lower than those prior to TACE, but there was no statistical significance (P ＞ 0. 05). Conclusion PWI is a very sensitive imaging technique that can be used to monitor early dynamic changes of HCC following TACE.

MVD and VEGF expression in the acute liver injury treated with allogeneic MBMCs transplantation / 中南大学学报(医学版)

point (P<0.05).Conclusion Transplantation of MBMCs promotes the expression of VEGF, up-regulates the MVD value in the acute injury livers, and facilitates the recovery of liver function.