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| 1 | Reducing Influence of Gravity Model Error in Precise Orbit Determination of Low Earth Orbit Satellites显示文摘Based on the orbit integration and orbit fitting method, the influence of the characters of the gravity model, with different precisions, on the movement of low Earth orbit satellites was studied. The way and the effect of absorbing the influence of gravity model error on CHAMP and GRACE satellite orbits, using linear and periodical empirical acceleration models and the so-called 'pseudo-stochastic pulses' model, were also analyzed. | GUO Jinlai HU Min ZHAO Qile GUO Daoyu | 2007 | Geo-Spatial Information Science2007，10，2： | 2 |
| 2 | Cine magnetic resonance imaging for quantitative assessment of healthy volunteers and patients with organic small bowel disease显示文摘Objective The aim of the study was to use dynamic magnetic resonance imaging(MRI) to compare quantitative parameters of small bowel motility between healthy volunteers and patients with small bowel diseases in order to investigate the characteristics of normal and impaired bowel peristalsis. Methods A total of 44 healthy volunteers(20 men, 24 women; mean age: 36 years; range: 20–61 years) and 42 patients(28 men, 14 women; mean age: 44 years; range: 15–72 years) with organic small bowel disease were recruited in our hospital(Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China) in this prospective study approved by the hospital institutional review board. Imaging was performed using a 3.0-T scanner 45 minutes after standardized oral administration of 1500 m L non-absorbable fluid(2.5% mannitol). A serial coronal scan was performed at selected planes for two minutes without breath-hold. Time-caliber curves were plotted at two well-distended small bowel loops in both healthy and patient groups regardless of location. Luminal diameter(LD), contraction period(CP), frequency of contraction(FC), and amplitude-diameter ratio(ADR) were measured based on the graph. Results The characteristics of abnormal peristaltic parameters were assessed in different patients and compared to normal curves from healthy volunteers. A total of 37 segments with abnormal motility were confirmed by two readers in consensus, based on curve patterns and the presence of a stationary phase. Compared to normal peristalsis in healthy volunteers, five different patterns of impaired peristalsis were identified: I, consecutive; II, slow; III, giant type; IV, uncoordinated; and V, akinetic. Dilated LDs were detected in all instances of abnormal peristalsis(P < 0.05). Increased frequency was found in type I [(8.73 ± 1.15) /min], while decreased frequency was detected in type III peristalsis [(0.67 ± 0.29) /min]. There were no significant differences in frequency between type II [(3.19 ± 0.43) /min] and normal peristalsis [(3.45 ± 0.57) /min]. Apart from type I [(8.70 ± 0.75) /min], increased FCs were found in all other abnormal patterns. In type II peristalsis, the average ADR value was 0.82 ± 0.08, comparable to the ADR value in the healthy group(0.83 ± 0.13). Conclusion MR cine is an effective method for differentiating normal and abnormal small bowel peristalsis. Plotting time-caliber curves and measuring quantitative MR cine parameters such as LD, CP, FC, and ADR offers more precise information about small bowel motility. | Zi Wang Hao Tang Jianjun Li Qiuxia Wang Yaqi Shen Zhen Li Sishu Yuan Daoyu Hu | 2015 | Oncology and Translational Medicine2015，1，4： | 1 |
| 3 | Computed tomographic qualitative diagnosis of renal masses显示文摘 | Hui Ye HU Daoyu XIA Jun | | 0，，06： | 1 |
| 4 | Intravoxel incoherent motion magnetic resonance imaging for diagnosis of cervical cancer and evaluation of response of uterine cervical cancer to radiochemotherapy: A pilot study显示文摘Objective The aim of this study was to investigate the ability of intravoxel incoherent motion(IVIM) diffusion-weighted magnetic resonance imaging(MRI) to diagnose cervical cancer and to evaluate the response of uterine cervical cancer to radiochemotherapy(CRT).Methods This prospective study was approved by the institutional review board, and informed consent was obtained from all patients. A total of 23 patients with primary cervical cancer who were undergoing CRT and 16 age-matched healthy subjects were prospectively recruited for IVIM(b = 0–800 s/mm2) and standard pelvic MRI. Bi-exponential analysis was performed to derive f(perfusion fraction), D*(pseudo-diffusion coefficient), and D(true molecular diffusion coefficient) in cervical cancer(n = 23) and the normal cervix(n = 16). The apparent diffusion coefficient(standard ADC) was calculated. The independent-samples t-test and paired-samples t-test were used for comparisons.Results Pre-treatment cervical cancer had the lowest standard ADC(1.15 ± 0.13 × 10-3 mm2/s) and D(0.89 ± 0.10 × 10-3 mm2/s) values, and these were significantly different from the normal cervix and posttreatment cervical cancer(P = 0.00). The f(16.67 ± 5.85%) was lowest in pre-treatment cervical cancer and was significantly different from the normal cervix and post-treatment cervical cancer(p = 0.012 and 0.00, respectively). No difference was observed in D*.Conclusion IVIM is potentially promising for differentiating between the normal cervix and cervical cancer because pre-treated cervical cancer has low perfusion and diffusion IVIM characteristics. Further, the standard ADC, D, and f of cervical cancer showed a tendency to normalize after CRT; thus, IVIM may be useful for monitoring the response to CRT in cervical cancer. | Yanchun Wang Shan Hu Xuemei Hu Jianjun Li Yaqi Shen Xiaoyu Liu Zhi Wang Xiaoyan Meng Zhen Li Daoyu Hu | 2015 | Oncology and Translational Medicine2015，1，4： | 1 |
| 5 | Preliminary clinical application of an adaptive iterative statistical reconstruction algorithm inhead and neck computed tomography angiography with low tube voltage and a low concentration of contrast medium显示文摘Objective To evaluate the feasibility of using a low concentration of contrast medium(Visipaque 270 mg I/m L), low tube voltage, and an advanced image reconstruction algorithm in head and neck computed tomography angiography(CTA).Methods Forty patients(22 men and 18 women; average age 48.7 ± 14.25 years; average body mass index 23.9 ± 3.7 kg/m2) undergoing CTA for suspected vascular diseases were randomly assigned into two groups. Group A(n = 20) was administered 370 mg I/m L contrast medium, and group B(n = 20) was administered 270 mg I/m L contrast medium. Both groups were administered at a rate of 4.8 m L/s and an injection volume of 0.8 m L/kg. Images of group A were obtained with 120 k Vp and filtered back projection(FBP) reconstruction, whereas images of group B were obtained with 80 k Vp and 80% adaptive iterative statistical reconstruction algorithm(ASi R). The CT values and standard deviations of intracranial arteries and image noise on the corona radiata were measured to calculate the contrast-to-noise ratio(CNR) and signal-to-noise ratio(SNR). The beam-hardening artifacts(BHAs) around the skull base were calculated. Two readers evaluated the image quality with volume rendered images using scores from 1 to 5. The values between the two groups were statistically compared.Results The mean CT value of the intracranial arteries in group B was significantly higher than that in group A(P < 0.001). The CNR and SNR values in group B were also statistically higher than those in group A(P < 0.001). Image noise and BHAs were not significantly different between the two groups. The image quality score of VR images of in group B was significantly higher than that in group A(P = 0.001). However, the quality scores of axial enhancement images in group B became significantly smaller than those in group A(P< 0.001). The CT dose index volume and dose-length product were decreased by 63.8% and 64%, respectively, in group B(P < 0.001 for both).Conclusion Visipaque combined with 80 k Vp and 80% ASi R provided similar image quality in intracranial CTA with 64% radiation dose reduction compared with the use of Iopamidol, 120 k Vp, and FBP reconstruction. | Shan Hu Wenzhen Zhu Daoyu Hu XiaoYan Meng Jinhua Zhang Weijia Wan Li Zhou | 2015 | Oncology and Translational Medicine2015，1，4： | 1 |
| 6 | The double intervention clinical value and application research of TACE with PAI on massive hepatocellular carcinoma显示文摘Objective:To study the efficacy of transcatheter arterial chemoembolization(TACE) combined with percutaneous acetic acid injection(PAI) on massive hepatocellular carcinoma(MHCC). Methods:TACE was performed in 57 patients with MHCC,which were randomly divided into group A(n = 28) and group B(n = 29). Patients in the group A received conventional TACE for the first time and then received low dose TACE(10 mg mitomycin C) for the repeated treatment,Re-examined CT scans after TACE for a week. Based on filled status of Lipiodol in the Lesions,PAI was underwent in the area of rarefaction or defect filled by Lipiodol. Patients in the group B received conventional TACE. Then The survival rate and masses variation and hepatic function and α-FP and side effects were observed. Results:The 1-,2-and 3-year survival rate after TACE were 96.4%,78.6% and 32.1% for group A,and 65.5%,48.3% and 20.7% for group B. Masses diminution were found in all patients in group A,while 20 cases were found in group B,unchanged in 5 cases and enlarged in 4 cases. Conclusion:The efficacy of TACE combined with PAI are significantly better than that of TACE only,low dose TACE produces less hepatic damage and less side effect. | Sibin Liu Daoyu Hu Yuanyi Huang Dinghu Rao Wenhui Zhou Jiangze Liu | 2008 | The Chinese-German Journal of Clinical Oncology2008，7，3： | 0 |
| 7 | New era, new concept, new idea显示文摘Nowadays,with the development of science and technology,the specialization of clinical medicine and refinement of treatment demand more accurate diagnoses,which is a new challenge for our radiologists.Improved methods are developed constantly as | Daoyu Hu | 2015 | Oncology and Translational Medicine2015，1，4： | 0 |
| 8 | Acquired renal arteriovenous malformation:the diagnostic value of three-dimensional multidetector-row computed tomography显示文摘Objective To evaluate the diagnostic value of three-dimensional multidetector-row computed tomography(MDCT) in detecting acquired renal arteriovenous malformation(RAVM) and to compare its performance with that of ultrasonography and digital subtraction angiography(DSA). Methods The institutional review board approved this retrospective study and written informed consent was obtained from all patients before examination. All 14 patients with acquired RAVM underwent MDCT, including cortical and medullary phase enhancement angiography and three-dimensional(3D) reconstruction. Five and nine patients were further examined and their diagnoses confirmed by DSA and surgery, respectively. The MDCT images, including 3D reconstructions, were analyzed for RAVM independently and in consensus by two observers using a workstation.Results Among the 14 patients with acquired RAVM, 12 with maximum lesion diameter ≥ 10 mm, and one with a maximum lesion diameter between 5 and 10 mm, were correctly diagnosed with MDCT angiography. Among these patients, four diagnoses were confirmed by DSA. One patient with a lesion 5–10 mm in diameter was misdiagnosed with a renal aneurysm by MDCT angiography. The other one with the maximum diameter of the lesion between 5 mm and 10 mm was misdiagnosed as renal aneurysm with MDCT angiography, which was diagnosed as renal arteriovenous malformation with DSA. Among 14 lesions in 14 patients, eight and six originated in the left and right kidney, respectively.Conclusion MDCT angiography can accurately diagnose RAVM and improve our understanding of the disease, which will allow clinicians to provide better care. | Qiuxia Wang Liang Chen Xuemei Hu Yao Hu Daoyu Hu Zhen Li | 2015 | Oncology and Translational Medicine2015，1，4： | 0 |
| 9 | Intestinal lymphangiectasia associated with chylothorax and multiple lower extremity arteriovenous malformation: A case report and literature review显示文摘Intestinal lymphangiectasia(IL) is an uncommon protein losing enteropathy, characterized by small intestinal mucosa or serosa lymphangiectasia and intestine lymph loss. Currently, IL is a very rare disease in children or adults, with typical clinical symptoms including hypoalbuminemia, absolute lymphocyte reduction, ascites, edema, etc. We report a case of an adult with intestinal lymphatic ectasia accompanied by chylothorax and multiply arteriovenous malformations of the hip and lower extremity. CT and MRI revealed diffuse edema and thickening of the small intestine, accompanied by splenomegaly and pleural effusion. Extensive nodularity of lower ileum and the ileocecal region could be seen during intestinal endoscopy. Finally, small intestinal lamina propria lymphangiectasis was confirmed by pathological examination. To raise awareness of the disease, here we compare our case and those previously reported, and discuss the diagnosis and management of IL. | Haojie Li Daoyu Hu Lili Liang Yao Hu Zhen Li | 2015 | Oncology and Translational Medicine2015，1，4： | 0 |
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