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.

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.

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.

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.