Objective To discuss the application value of 16-slice spiral CT in lower extremity angiography diagnosis of arteriosclerotic occlusive disease.Methods The 16-slice spiral CT was performed for 30 patients with disease of lower extremity to reconstruct maximal intensity projection(MIP),volume rendering technique(VR) and curved planar reconstruction(CPR).Results All the examinations of CTA were successful,abdominal aortic stenosis was 4 cases,Iliac artery stenosis was 6 cases,femoral artery stenosis was 8 cases and occlusion was 3 cases;lower leg arterial stenosis was 7 cases and occlusion was 2 cases.There are varying degrees of stenosis or occlusion in following femoral artery for all patients.Conclusion The 16-slice CT of lower extremity angiography can be an intuitive understanding of the extent and scope of lesions,and is a safe,accurate,non-invasive screening method in lower extremity artery.

Objective To investigate the relationship between CT signs of portal hypertension and histopathologic stage of chronic hepatic fibrosis and cirrhosis. Methods Tri-stage enhance volume CT scan of upper abdomen was performed in 84 participants, including 48 patients with hepatic fibrosis confirmed by liver pathologic biopsy which divided into S1 (12/48), S2 (14/48), S3 (9/48) and S4 (13/48),16 patients with typical cirrhosis, and 20 healthy subjects as a control group. Measured the caliber of left and right branch of portal vein, MPV, SV and SMV at MIP images respectively, observed the collateral circulation, ascites and the size of spleen and then studied comparatively these measured parameters of different histopathologic stage. One-Way ANOVA was performed in the comparison of the vascular diameter of portal system and the size of spleen(SNK was used in the comparison between the groups). x2 test ofR × Ctable was performed in the comparison of ascites and collateral circulation among groups, and the vessel of portal system which has the greatest impact on the pathological staging of hepatic fibrosis was investigated with Logistic regression analysis. Results The caliber of left branch of portal vein, right branch of portal vein. MPV. SV and SMV were (0.98±0.11). (1.00±0.12), (1.33±0.11). (0.75±0.10).(1.07±0. 12) em respctively, the size of spleen was (128. 55±30. 56) cm<'3>, and collateral circulation and ascites were not found in control group. SV enlarged gradually in test groups and showed S1 (0. 86±0. 12) cm, S2(0. 96±0. 11) cm, S3(1.07±0.08) cm, S4(1.09±0. 10) cm, typical cirrhosis (1.18±0. 19) cm respotively. The difference between each group of S1 to typical cirrhosis and control group was significant, and the same result was seen among S3 to S4, cirrhosis and S1 to S2. Logostic regression analysis showed that the standardized regression coefficient of SV was maximum (2. 719) and had statistical significance(P <0. 01). The incidence of collateral circulati on and ascites in patients with typical cirrhosiswas significant higher than that of normal liver and every stage of hepatic fibrosis (P < 0. 05). Conclusion CT scan may be helpful for the early detection of advanced hepatic fibrosis or early stage of liver cirrhosis for patients with chronic liver disease.

Based on quantum mechanics, rotational spectroscopy is a branch of fundamental science to study the rotational spectra of molecules, free radicals and ions, and has great applications on radio astronomy and many analytical fields such as atmospheric remote sensing. In this paper we reviewed the basic theory of rotational spectroscopy, two different types of Fourier transform microwave spectrometers, some typical spectroscopic analysis, and future prospect of the microwave spectroscopic techniques as well.

Objective:To analyze the treatment outcomes and prognoses of children with head and neck non-parameningeal rhabdomyosarcoma (HNnPM RMS).Methods:A retrospective analysis was performed on the clinical data of children with HNnPM RMS admitted to Beijing Children′s Hospital from September 2012 to September 2022. The clinical features, comprehensive treatment modes and prognoses of the patients were analyzed. The overall survival rate (OS) and event free survival rate (EFS) were calculated using the Kaplan-Meier method, and univariate analysis was performed using the Log-rank test.Results:A total of 70 children were included in this study, 38 males and 32 females, with a median age of 47 months (2-210 months). Pathological subtypes including the embryonal in 27 cases, the alveolar in 36 cases and the spindle cell and sclerosing in 7 cases. Thirty children (83.3%) with alveolar type were positive for FOXO1 gene fusion. All 70 children underwent chemotherapy, including 38 with neoadjuvant chemotherapy and 32 with adjuvant chemotherapy. Sixty of 70 children underwent surgery, of whom, 10 underwent two or more surgeries. There were 63 children underwent radiotherapy, including 54 with intensity-modulated radiation therapy, 4 with particle implantation and 5 with proton therapy. The median follow-up was 45 (5-113) months, the 5-year OS was 73.2%, and the 5-year EFS was 57.7%. Univariate analysis showed lymph node metastasis ( χ2=5.022, P=0.025), distant metastasis ( χ2=8.258, P=0.004), and high Intergroup Rhabdomyosarcoma Study (IRS) group ( χ2=9.859, P=0.029) as risk factors for poor prognosis. Before June 2016, the 5-year OS based on BCH-RMS-2006 scheme was 63.6%, and after 2016, the 5-year OS based on CCCG-RMS-2016 scheme was 79.6%. Conclusion:Multidisciplinary combined standardized treatment can offer good treatment outcome and prognosis for children with HNnPM RMS. Local control is a key to the efficacy of comprehensive treatment.