The application of magnetic resonance imaging-guided microwave ablation for lung cancer

Context: It is necessary to explore a minimally invasive, effective, and efficient treatment for those lung cancer patients who are poor candidates for surgery. Aim: This study aimed to investigate the application of microwave ablation (MWA) in the treatment of lung cancer. Settings and Design: A total of 43 patients with 44 pulmonary lesions were examined following identical procedures before being randomly divided into two groups. The experimental group consists of 17 patients with a total of 18 pulmonary lesions, while the control group consists of 26 patients with a total of 26 pulmonary lesions. Materials and Methods: The experimental group was treated using magnetic resonance imaging (MRI)-guided MWA while the control group was treated using computer tomography (CT)-guided MWA. A transverse relaxation time-turbo spin echo (T2-TSE) sequence was used for signal collection in the experimental group to determine puncture location and microwave needle position while T2-TSE, T1-turbo field echo, and diffusion-weighted MRI (DWI) sequences were used for timely efficacy evaluation. Whereas in the control group, CT axial scanning was performed to serve similar purposes. Statistical Analysis Used: A nonparametric Wilcoxon test, median (M [25%, 75%]). Results: All of the 44 lesions were successfully located on the first attempt. The mean time for scanning and locating lung lesions under MRI and CT guidance were 64.53 and 42.96 min, the mean times of positioning were 12 and 18 min, and the mean durations of MWA were 12.48 and 15.06 min, respectively. Conclusions: As a minimally invasive method for treating lung tumors, MRI-guided MWA requires fewer localization scans, a shorter MWA duration, no radiation, real-time observation of the curative effect, and it prevents overtreatment

Comparison on three-dimensional MR cholangiopancreatography with breath-hold gradient-spin echo and respiratory gated triggering turbo-spin echo / 中国医学影像技术

Objective: To compare the image quality of three-dimensional MR cholangiopancreatography with breath-hold gradient-spin echo (3D-Grase-MRCP) and respiratory gated triggering turbo-spin echo (3D-Tse-MRCP). Methods: Totally 96 patients with suspicious pancreatic or biliary tract diseases underwent 3D-Grase-MRCP and 3D-Tse-MRCP scanning. The image quality scores, lesion display and contrast noise ratio (CNR)of the common bile duct were compared and analyzed between 3D-Grase-MRCP and 3D-Tse-MRC. The 3D-Grase-MRCP images were divided into hold-breath group and poor hold-breath group, and the image quality scores were compared between 2 groups. Results: CNR of common bile duct on 3D-Tse-MRCP images (357.08 [209.73, 594.38]) were higher than that on 3D-Grase-MRCP (256.14 [141.54, 417.87],Z=-3.01, P<0.05). The imaging scores on 3D-Grase-MRCP of the gallbladder, ductus cysticus, common bile duct and intrahepatic bile duct were higher than those on 3D-Tse-MRCP (all P<0.01). 3D-Grase-MRCP showed gallstones (n=42) and cystic duct stones (n=7) more clearly than 3D-Tse-MRCP (both P<0.05). Imaging scores of gallbladder, ductus cysticus, common bile duct, pancreatic duct and intrahepatic bile duct on 3D-Grase-MRCP in hold-breath group (n=68) were higher than those in poor hold-breath group (n=28) (all P<0.01). Conclusion: The imaging quality and lesion display of breath-hold 3D-Grase-MRCP sequence are superior to those of respiratory gated triggering 3D-Tse-MRCP sequence with significantly shortened scanning time, which is expected to be used as a new method for MRCP.

Application of different sequences in diagnosis of bone contusion / 中国矫形外科杂志

[Objective]To investigate the clinical value of different magnetic resonance(MR) pulse sequences in the diagnosis of bone contusion.[Method]Forty-five patients with bone contusion underwent magnetic resonance imaging(MRI).All cases underwent computed radiography(CR),digital radiography(DR)or computed tomography(CT)and no bone fracture were revealed.Complications included swelling、pain and limit activity.The sagittal,coronal and transversal scanning were performed by Siemens Novus1.5T magnetic resonance imaging.The body coil were used on spines and knee coil on knees.MR pulse sequences included spin echo T1WI,Turbo spin echo T2WI,fl-2d T2WI and fat suppressed sequence T2WI.[Result]In 45 cases with bone contusion,44 cases were revealed on spin echo T1WI(97.7%),37 cases on Turbo spin echo T2WI(82.2%),24 cases on fl-2d T2WI(75%),45 cases on fat suppressed sequence T2WI(100%).The fat suppressed sequence T2WI was superior to TSE T2WI(