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排序方式: 共有46条查询结果,搜索用时 15 毫秒
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Sijens PE Irwan R Potze JH Mostert JP De Keyser J Oudkerk M 《European radiology》2005,15(8):1686-1693
Primary progressive multiple sclerosis (ppMS; n=4) patients and controls (n=4) were examined by 1H magnetic resonance spectroscopy (MRS) and diffusion tensor imaging (DTI) in order to map choline (Cho), creatine and N-acetylaspartate (NAA), the fractional anisotropy (FA) and the apparent diffusion constant (ADC). After chemical shift imaging (point-resolved spectroscopy, repetition time/echo time 1,500 ms/135 ms) of a supraventricular volume of interest of 8×8×2 cm3 (64 voxels) MRS peak areas were matched to the results of DTI for the corresponding volume elements. Mean FA and NAA values were reduced in the ppMS patients (P<0.01, both) and the ADC increased (P<0.02). The spatial distribution of NAA showed strong correlation to ADC in both ppMS patients and controls (r =–0.74 and r= –0.70; P<0.00001, both), and weaker correlations to FA (r=0.49 and r=0.41; P<0.00001, all). FA and ADC also correlated significantly with Cho in patients and controls (P<0.00001, all). The relationship of Cho and NAA to the ADC and the FA and thus to the content of neuronal structures suggests that these metabolite signals essentially originate from axons (NAA) and the myelin sheath (Cho). This is of interest in view of previous reports in which Cho increases were associated with demyelination and the subsequent breakdown of neurons. 相似文献
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Woraphat Ratta-apha Akitoyo Hishimoto Kentaro Mouri Kyoichi Shiroiwa Toru Sasada Masakuni Yoshida Irwan Supriyanto Yasuhiro Ueno Migiwa Asano Osamu Shirakawa Hideru Togashi Yoshimi Takai Ichiro Sora 《Neuroscience research》2013
The Disrupted-in-Schizophrenia 1 (DISC1) gene plays a role in the regulation of neural development. Previous evidence from genetic association and biological studies implicates the DISC1 gene as having a role in the pathophysiology of schizophrenia. In the present study, we explored the association between DISC1 missense mutation rs821616 (Ser704Cys) single nucleotide polymorphism (SNP) and four other SNPs (rs1772702, rs1754603, rs821621, rs821624) in the related haplotype block and schizophrenia in the Japanese population. We could not find a significant association of selected SNPs with schizophrenia after correction for multiple testing. We performed a meta-analysis of the Ser704Cys variant in schizophrenia using data from the present study and five previous Japanese population studies, and found no association with schizophrenia. We also examined DISC1 immunoreactivity in postmortem prefrontal cortex specimens of schizophrenia patients compared to control samples. The immunoreactivity revealed a significant decrease of DISC1 protein expression in the schizophrenia samples after ruling out potential confounding factors. However, the Ser704Cys variant did not show effects on DISC1 immunoreactivity. These results provide evidence that this functional genetic variation of DISC1 do not underlie the pathophysiology of schizophrenia in the Japanese population. 相似文献
4.
Linking a genome‐wide association study signal to a LRRK2 coding variant in Parkinson's disease
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Jia Nee Foo PhD Sun Ju Chung MD PhD Louis C. Tan MD Herty Liany MS Ho‐Sung Ryu MD Myunghee Hong MS Tat Hung Koh MS Ishak D. Irwan MS Wing‐Lok Au MD Kumar‐M. Prakash MD Tin Aung MD PhD Ching‐Yu Cheng MD PhD Siow‐Ann Chong MD Chiea Chuen Khor MD PhD Jimmy Lee MD E‐Shyong Tai MD PhD Eranga N. Vithana PhD Tien‐Yin Wong MD PhD Kyuyoung Song PhD Eng‐King Tan MD 《Movement disorders》2016,31(4):484-487
5.
Brain magnetic resonance spectroscopy (MRS) and diffusion tensor imaging (DTI) in one patient with merosin-deficient congenital muscular dystrophy (MDCMD) revealed significant metabolite (choline, creatine, N-acetyl aspartate) level reductions, fractional anisotropy (FA) reduction and increased apparent diffusion coefficient (ADC) in the white matter (p<0.01, all). In the gray matter, the MRS properties did not differ significantly from those in controls. The ADC and FA, however, differed significantly as in the white matter, although the differences were less pronounced. This is the first quantitative MR study of the brain in a patient with MDCMD, which revealed that the concentrations of all MRS measured metabolites were decreased only in the white matter. This observation, combined with the DTI observed ADC increases and FA decrease, indicated a presence of vasogenic edema in the white matter. 相似文献
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Selective mediastinal node irradiation based on FDG-PET scan data in patients with non-small-cell lung cancer: a prospective clinical study 总被引:3,自引:0,他引:3
De Ruysscher D Wanders S van Haren E Hochstenbag M Geeraedts W Utama I Simons J Dohmen J Rhami A Buell U Thimister P Snoep G Boersma L Verschueren T van Baardwijk A Minken A Bentzen SM Lambin P 《International journal of radiation oncology, biology, physics》2005,62(4):988-994
PURPOSE: To evaluate the patterns of recurrence when selective mediastinal node irradiation based on FDG-PET scan data is used in patients with non-small-cell lung cancer (NSCLC). METHODS AND MATERIALS: A prospective Phase I/II study was undertaken on 44 patients with NSCLC without detectable distant metastases on CT and FDG-PET scan, delivering either 61.2 Gy in 34 fractions over 23 days or 64.8 Gy in 36 fractions over 24 days (1.8 Gy b.i.d. with 8-h interval). Only the primary tumor and the positive mediastinal areas on the pretreatment FDG-PET scan were irradiated. Isolated nodal failure was defined as recurrence in the regional nodes outside of the clinical target volume, in the absence of in-field failure. RESULTS: The CT and FDG-PET stage distribution was as follows: Stage I: 8 patients (18%) and 13 patients (29%); Stage II: 6 patients (14%) and 10 patients (23%); Stage IIIA: 15 patients (34%) and 7 patients (16%); Stage IIIB: 15 patients (34%) and 14 patients (32%), respectively. After a median follow-up time of 16 months (95% confidence interval [CI], 11-21 months) postradiotherapy, 11 patients (25%) developed a local recurrence. Only 1 patient (crude rate, 2.3%; upper bound of 95% CI, 10.3%), with a Stage II tumor on both CT and PET, developed an isolated nodal failure. The median actuarial overall survival was 21 months (95% CI, 14-28 months), and the median actuarial progression-free survival was 18 months (95% CI, 12-24 months). CONCLUSIONS: Selective mediastinal node irradiation based on FDG-PET scan data in patients with NSCLC results in low isolated nodal failure rates. In the Phase I component of this trial, radiation dose escalation up to 64.8 Gy in 36 fractions over 24 days is feasible. 相似文献
8.
Afkar Aulia Carla Raymondalexas Marchira Irwan Supriyanto Budi Pratiti 《Journal of consumer health on the Internet》2020,24(1):1-9
AbstractCyberchondria is a relatively new term addressing health anxiety associated with online information. Research data is scarce, as most instruments measuring anxiety do not consider online behavior an important factor. Medical students are arguably assumed to have frequent health anxieties, i.e. “medical student syndrome.” Moreover, they are exposed to large amounts of information. We aimed to measure the level of cyberchondria severity of first-year medical students. First-year medical students of the regular program at Universitas Gadjah Mada completed self-reported instruments (the Cyberchondria Severity Scale (CSS) and the Beck Anxiety Inventory (BAI)). Cut off was determined using ROC analysis to find the best score that corresponded to BAI cut off of 16. Data were analyzed using chi square and t-tests to analyze any differences between gender. Respondents were 162 students, 54 males and 108 females, with mean age 18.18-year-old ± 0.696. Based on ROC analysis, cut off of 75.5 corresponded with BAI score of 16. Mean CSS score was 70.73 ± 16.292. There was no significant difference of CSS scores between genders. Based on the analysis of individual items, compared to male students, female students more frequently searched for physical symptoms on the Internet, and afterwards, consulted the results with a General Practitioner (GP), discussed with a GP, or went to other specialists; and thus, more frequently required reassurance after online search. In contrast, male students more frequently had difficulty relaxing after searching online for physical symptoms. We concluded that there was no difference of overall cyberchondria severity score, but there were slight but significant differences of online behavior between genders. 相似文献
9.
Irwan R Lane RG 《Journal of the Optical Society of America. A, Optics and image science》1998,15(9):2302-2311
An algorithm for phase retrieval with Bayesian statistics is discussed. It is shown how the statistics of Kolmogorov turbulence can be used to compute the likelihood for a particular phase screen. This likelihood is then added to that of the observed data to produce a functional that is maximized directly by use of conjugate gradient maximization. It is shown that although this can significantly improve the quality of the phase estimate,the issue is complicated by local maxima introduced by the possibility of phase wrapping. The causes of the local maxima are analyzed, and a method that increases the likelihood of convergence to the global maximum is presented. 相似文献
10.
Cui H Supriyanto I Sasada T Shiroiwa K Fukutake M Shirakawa O Asano M Ueno Y Nagasaki Y Hishimoto A 《Progress in neuro-psychopharmacology & biological psychiatry》2011,35(4):1108-1111