AIM: To evaluate the value of miniprobe sonography (MPS),spiral CT and MR imaging (MRI) in the tumor and regionallymph nocle staging of esophageal cancer.METHODS: Eight-six patients (56 men and 30 women; agerange of 3...AIM: To evaluate the value of miniprobe sonography (MPS),spiral CT and MR imaging (MRI) in the tumor and regionallymph nocle staging of esophageal cancer.METHODS: Eight-six patients (56 men and 30 women; agerange of 39-73 years, mean 62 years) with esophagealcarcinoma were staged .preoperatively with imagingmodalities. Of them, 81 (94 %) had squamous cell carcinoma,4(5 %) adenocarcinoma, and 1(1%) adenoacanthoma.Eleven patients (12 %) had malignancy of the upper onethird, 41 (48 %) of the mid-esophagus and 34 (40 %) ofthe distal one third. Forty-one were examined by spiral CTin whom 13 were co-examined by MPS, and forty-five byMRI in whom 18 were also co-examined by MPS. Theseimaging results were compared with the findings of thehistopathologic examination for resected specimens.RESULTS: In staging the depth of tumor growth, MPS wassignificantly more accurate (84 %) than spiral CT and MRI(68 % and 60 %, respectively, P＜0.05). The specificity andsensitivity were 82 % and 85 % for MPS; 60 % and 69 % forspiral CT; and 40 % and 63 % for MRI, respectively. In stagingregional lymph nodes, spiral CT was more accurate (78 %)than MPS and MRI (71% and 64 %, respectively), but thedifference was not statistically significant. The specificity andsensitivity were 79 % and 77 % for spiral CT; 75 % and 68 %for MPS; and 68 % and 62 % for MRI, respectively.CONCLUSION:MPS is superior to spiral CT or MRI for Tstaging, especially in early esophageal cancer. However,the three modalities have the similar accuracy in N staging.Spiral CT or MRI is helpful for the detection of far-distancemetastasis in esophageal cancer.展开更多
The working principle of the pipeline intelligent pig and the structure of ultrasonic probe array used to detect defects in oil/gas pipeline are introduced. The effects of the array＇ s radial position in pipe on defe...The working principle of the pipeline intelligent pig and the structure of ultrasonic probe array used to detect defects in oil/gas pipeline are introduced. The effects of the array＇ s radial position in pipe on defect resolution are analyzed. The causes leading to radial positioning error are investigated. An algo- rithm for the radial self-positioning is presented. The experimental results show that the radial self-positioning algorithm can eliminate the array＇ s space position error effectively and improve the defect resolution.展开更多
文摘AIM: To evaluate the value of miniprobe sonography (MPS),spiral CT and MR imaging (MRI) in the tumor and regionallymph nocle staging of esophageal cancer.METHODS: Eight-six patients (56 men and 30 women; agerange of 39-73 years, mean 62 years) with esophagealcarcinoma were staged .preoperatively with imagingmodalities. Of them, 81 (94 %) had squamous cell carcinoma,4(5 %) adenocarcinoma, and 1(1%) adenoacanthoma.Eleven patients (12 %) had malignancy of the upper onethird, 41 (48 %) of the mid-esophagus and 34 (40 %) ofthe distal one third. Forty-one were examined by spiral CTin whom 13 were co-examined by MPS, and forty-five byMRI in whom 18 were also co-examined by MPS. Theseimaging results were compared with the findings of thehistopathologic examination for resected specimens.RESULTS: In staging the depth of tumor growth, MPS wassignificantly more accurate (84 %) than spiral CT and MRI(68 % and 60 %, respectively, P＜0.05). The specificity andsensitivity were 82 % and 85 % for MPS; 60 % and 69 % forspiral CT; and 40 % and 63 % for MRI, respectively. In stagingregional lymph nodes, spiral CT was more accurate (78 %)than MPS and MRI (71% and 64 %, respectively), but thedifference was not statistically significant. The specificity andsensitivity were 79 % and 77 % for spiral CT; 75 % and 68 %for MPS; and 68 % and 62 % for MRI, respectively.CONCLUSION:MPS is superior to spiral CT or MRI for Tstaging, especially in early esophageal cancer. However,the three modalities have the similar accuracy in N staging.Spiral CT or MRI is helpful for the detection of far-distancemetastasis in esophageal cancer.
文摘The working principle of the pipeline intelligent pig and the structure of ultrasonic probe array used to detect defects in oil/gas pipeline are introduced. The effects of the array＇ s radial position in pipe on defect resolution are analyzed. The causes leading to radial positioning error are investigated. An algo- rithm for the radial self-positioning is presented. The experimental results show that the radial self-positioning algorithm can eliminate the array＇ s space position error effectively and improve the defect resolution.
