RESUMEN
Objective To investigate the food radioactivity levels in areas around the Xudabao nuclear plant before operation. Methods The food radioactivity levels were achieved by detecting samples collected within 30 km around the Xudabao nuclear power plant with a HPGe detector. Results The major radionuclides in food were 238U, 226Ra, 232Th, 40K and the man-made radionuclide of 137Cs. The average activity levels of natural 238U、226Ra、232Th、40K were(1.2 × 10−11 ± 2.6 × 10−11)、(9.2 × 10−12 ± 1.6 × 10−11)、(3.6 × 10−11 ± 6.5 × 10−12)、(9.0 × 101 ± 5.8 × 101)Bq/kg respectively. The average level of 137Cs in food was (1.2 × 10−12 ± 9.0 × 10−13)Bq/kg. Conclusion The man-made radionuclides were not detected except 137Cs in the collected food. The radioactivity concentrations were lower than the national standards. The effective dose for local residents by ingestion of 137Cs was around 6.0 × 10−12 µSv/a.
RESUMEN
Objective:To evaluate the impacts of radioactivity in foods since begining of the operation of the Hongyanhe Nuclear Power Plant (HNPP).Methods:The levels of radioactivity in foods collected within 30 km of HNPP from 2013 to 2020 were analyzed by comparison of the control samples and those collected before the operation. The impacts on the operation of the HNPP on foods were evaluated.Results:The man-made radionuclides such as 131I, 134Cs, 60Co, 58Co, 110Ag m were not found in food samples. The nautral radionuclides such as 238U, 226Ra, 232Th, 40K were at the normal levels, with the average levels of (0.088±0.053), (0.155±0.178), (0.314±0.388)and(81.3±18.1)Bq/kg(fresh weight)in foods, respectively. The average levels of man-made nuclide 137Cs in foods were (0.013±0.010) Bq/kg (fresh weight). There was no increase in radionuclide levels compared with the control samples and the samples before the operation. Conclusions:The impacts on foods due to the operation of HNPP was not found.
RESUMEN
Objective To summarize the outcome of nasopharyngeal carcinoma ( NPC) treated by helical tomotherapy in the Chinese PLA general hospital. Methods Between September 2007 and August 2010, 121 newly diagnosed NPC patients were treated by radiotherapy with Tomotherapy system, with ( n =90) or without ( n = 31) concurrent chemotherapy or molecular target therapy. The prescription dose was 70 - 74 Gy/33f to primary tumor and positive lymph node planning target volume,60. 0 - 62. 7 Gy/33f to high risk planning target volume, and 52 -56 Gy/33f to low risk planning target volume. Acute side-effects were evaluated with RTOG/EORTC criteria. Results The remission rate of primary lesion and positive lymph nodes was 95. 0％ and 99. 0％ , respectively. The follow-up rate was 100％ . The number of patients with 1 ,2 and 3 years followed-up were 99 , 49 , and 7. The 1-, 2-and 3-year local relapse-free survival rates were 97. 30％ , 97. 3％ and 97. 3％ , respectively. The 1-,2-and 3-year nodal relapse-free survival rates were 100％ , 100％ and lOO％, respectively. The 1-, 2-and 3-year distant metastasis-free survival rates were 98. 4％ , 96. 3％ and 96. 3％ , respectively. The 1-, 2-and 3-year overall survival rates were 96. 5％ ,92. 6％ and 86. 8％ , respectively. Acute toxicities of skin, oral mucosa and xerostomia with grade 0,1,2 and 3 were 5. 0％ , 74. 4％ , 15. 7％ and 4. 9％ ; 0. 8％ , 37. 2％ , 57. 9％ and 4. 1％ ; 3. 3％ , 53. 7％ ,43. 0％ and 0％ , respectively. Xerostomia restored with time, no grade 2 or more xerostomia was observed 1 year after radiation therapy. Concurrent chemotherapy significantly increased incidence of mucositis,esophagitis and tracheitis. Conclusion Helical tomotherapy is efficient, secure and effective modality for the treatment of nasopharyngeal carcinoma.
RESUMEN
Objective To analyze the relationship between periodontal diseases and coronary heart disease (CHD),Methods One hundred and sixty-two patients were enrolled into case group and another 162patients were enrolled into control group.Subjects were underwent questionaire investigation and clinic examination.Statistic analysis was performed using multi-factors Logistic regression analysis.Results periodontal diseases ( 95 ％ CI 1.651 - 4.082,OR =1.164 ),working stress ( 95 ％ CI 1.920 - 5.069,OR =3.119),obesity ( 95％ CI 2.298 - 5.133,OR =3.434 ),family history of cardiovascular diseases ( 95％ CI 1.616 - 5.410,OR =2.957),hypertension(95％ CI 2.061 - 6.455,OR =3.647 ) and fat-enriched diet(95％ CI 1.074 - 2.826,OR =1.659 ) were independent risk factors for CHD ( P ＜ 0.05 or P ＜ 0.001 ).Conclusion Dentist.can helo to prevent coronary heart diseases by preventing and curing the periodontal diseases.
RESUMEN
Objective To investigate the dosimetric characteristics of helical tomotherapy(HT),intensity-modulated radiation therapy(IMRT)and three.dimensional conformal radiation therapy(3D-CRT)for the post-operative breast cancer as well as their comparison in protecting the normal tissues.Methods The CT images of 10 postoperative patients with early stage breast cancer were transferRed into HT and IMRT and 3D- CRT planning system respectively after the target region and normal tissues were drawn out with the same doctor.Each prescribed dose for three kinds of plans was 50 Gy/25 fractions.Inrradiation doses and volume at heart and double lungs as well as conformity index(CI)and homogeneity index(HI)were evaluated.Results The PTV volume of prescribed target dose of 95% and 100%in HT, IMRT and 3D-CRT groups were 99.13%and 95.87%,97.80%and 94.05%,96.37%and 87.29%.respectively.The CI and HI in HT.IMRT and 3D-CRT groups were 0.80±0.10 and 1.09 ±0.03,0.65±0.07 and 1.14±0.02,0.40±0.08 and 1.17±0.04,respectively V5,V10 and V20 of the heart were the lowest at 3D-CRT than HT and lM RT.V5 of the diseased lung was the lowest at 3D-CRT compared to HT and IMRT.V5 and V10 of the healthy lung were the lowest at 3 D-CRT compared to other groups.Conclusions Compared with IMRT and 3D-CRT.HT technique in treating breast cancer had the best conformity index and homogeneity index as well as steeper dose gradient.Irradiated doses and volume at the heart was the lowest at 3D- CRT and the highest at IMRT.Irradiated doses and volume of the heart and healthy lung as well as the diseased lung were the lowest at 3D-CRT compared to HT and IMRT groups.
RESUMEN
Objective To compare the dosimetric characteristics of helical tomotherapy(HT)and step-and-shoot intensity modulated radiotherapy(IMRT)for post-operative cervix cancer patients. Methods Ten patients with post-operative cervix cancer were enrolled in this study.HT and IMRT plans were developed for each patient.The dose distributions of the targets,organs at risk(OARs),CI and HI were analyzed and compared.The prescribed dose was 60 Gy/25 f for CTV1,50 Gy/25 f for CTV2.The iso-dose line of 50 Gy was used.Results The homogeneity indexes(HI)(0.94±0.03),conformity index(C1)(1.28±0.02)in HT group were better than in IMRT group(0.85±0.01 and 1.36±0.03),respectively(t=5.12,-6.34,P<0.001).The Dmean of PTV in HT group(51.77 Gy)was lower than that in IMRT group(54.53 Gy)(t=-8.01,P<0.05).The Dmax ,Dmean,V30,V40 and V50 of bladder、rectum and small bowel were lower in HT group than those in IM RT group.The Dmax,Dmean,V30 and V40 of right and left femoral head were lower in HT group than those in IMRT group.Conclusion Helical tomotherapy treatment plan has a better homogeneity,steeper dose gradient,and a better protection for organs at risk.
RESUMEN
Objective To study dosimetric characteristics of helical tomotherapy (HT) by comparing its treatment plans with linear accelerator-based step-and-shoot intensity modulated radiation therapy (IMRT) for nasopharyngeal carcinoma(NPC). Methods Targets on CT images of 10 NPC patients were delineated and transferred to HT and IMRT treatment plan systems. The prescription dose was 70 Gy/33 f for pGTV and GTVnd,60 Gy/33 f for FTV1 ,and 54 Gy/33 f for PTV2. The limit dose of organ at risk was parotid V35 ＜50% ,brain-stem＜54 Gy,spinal cord ＜45 Gy and lens ＜9 Gy. Data of the two groups were compared by paired t-test. Results The dose distribution, conformality and homogeneity were good in both groups.But the homogeneity index(HI) and Dmean of PTV1 in HT group were better than IMRT group( P ＜ 0.01 ).The Dmean of PTV1 in HT group(63.84 Gy)was lower than IMRT group(70.30 Gy). The Dmean, V35 and V30 of parotids,and the Dmax of larynx-esophagus were lower in HT group than IMRT group. Conclusions Helical tomotherapy treatment plan has a better homogeneity, steeper dose gradient, and a better protection for organs at risk.
RESUMEN
Objective To evaluate the effect of early clinical interference strategies on preventing the conversion of acute pancreatitis to the severe form and aggravation of severe acute pancreatitis(SAP).Methods The patients with acute pancreatitis admitted to this hospital were divided into two therapeutic phases by different therapeutic methods from January 2001 to December 2008.Patients in the first phase(from January 2001 to December 2004) were treated by the routine management,and the second phase(from January 2005 to December 2008) by the routine management combined with early clinical interference strategies.Then,the ratio of conversion from acute pancreatitis to SAP and prognosis of SAP between two phases were compared.Results Compared with the first phase,the rate of aggravation of acute pancreatitis was significantly decreased in the second phase(4.48% vs.21.18%),the average healing time of SAP,the incidences of systemic and local complications and the mortality of pancreatitis were reduced(P
RESUMEN
Objective To study the longterm result of endocrinotherapy and (or) radiotherapy for moderately and far advanced prostate cancer. Methods 256 cases of moderately or far advanced prostate cancer were treated with endocrinotherapy (surgical castration + postoperative drug administration) and (or) radiotherapy.182 cases were of stage C and 74 stage D.There were 236 adenocarcinoma,7 squamous cancer and 13 undifferentiated cancer.Gleason score was ≥6 in 202 patients and 134 had pelvic lymphoid metastasis. Results In 92.2%of the patients,the serum PSA dropped under 2 ng/ml shortly after the treatment.The overall 5,10,15 year survival rates were 48.8%,29.7% and 13.3% respectively.For stage C cases,these were 58.2%,38.4%,17.7% and for stage D 25.7%,6.4%,0.The 5 and 10 year survival rates were significantly different between stage C and D(P
RESUMEN
35 Gy may be dangerous for the heart and aorta.
RESUMEN
Objective To analyse the long-term effect of non-small cell lung cancer treated with either postoperative irradiation(group A) or intraoperative radiotherapy(IORT) followed by postoperative irradiation(group B).Methods 154 patients with non-small cell lung carcinoma were randomized into two groups(groups A and B) with 77 patients in each.There were 134 squamous,17 adenocarcinoma and 3 adeno-squamous carcinoma.Seventeen patients had stage Ⅰ,76 stage Ⅱ and 61 stage Ⅲ lesions.The dose of postoperative irradiation in both groups was D_T4060?Gy.In group B,the IORT dose was 15-25?Gy,delivered by 9-16 ?MeV electrons.Results The local control rate was 49% and 62% in groups A and B,respectively(P0.05).Sixteen patients died of radiotherapy-induced complication: 2 in group A and 14 in group B.Conclusions Intraoperative radiotherapy followed by postoperative irradiation can enhance the local control rate of non-small cell lung cancer but can not improve the long term survival. The high complication mortality rate of IORT(18%) in contrast to that(3%) of postoperative radiotherapy is worth noticing.
RESUMEN
cases were histologically confirmed to be patients with squamous cell carcinoma, 4 cases to be patients with adenocarcinoma. The majority of the patients received stereotatic radiotherapy on the basis of external radiation. The single dose for stereotatic radiation was 5～10Gy, once every two days, 4～8 fractions, the total dose was 26～42 Gy by using 5～6 non-coplanar stationary beams or arc radiation. The patients′ CT was checked 2～3 months after treatment, there were 8 cases of CR( 26.7%), 18 cases of PR(60%),4 case of NR (13.3%).The median survival time was 12 months and the survival of 1 year and 2 years was 84 % and 61.2% (using Kaplan-Meier methods). The total effective rate was 86.7%. The results suggested that stereotatic radiotherapy (SRT) is effective for lung cancer at palliative and radical treatment. Combined with external irradiation, it can increase the doses of target and shorten the course of treatment.