International Journal of Medical Physics, Clinical Engineering and Radiation Oncology, 2020
Aims: This study compares data between the Field in Field planning and Wedge planning techniques ... more Aims: This study compares data between the Field in Field planning and Wedge planning techniques to figure out which technique has better dose coverage and distribution for PTV, and, if using FiF technique for whole brain treatment, how many beams will have better plan. Methods: 56 patients, who need to radiate whole brain with 30 Gy/10 fractions, have been selected for this study. Four plans have been made for each patient (FiF1-one subfield per field plan, FiF2-two subfields per field plan, FiF3-three subfields per field plan, and a Wedge plan). Results: The results of Field in Field plans including Compare dose distribution on the transverse CT slice, plan evaluation using DVH, number MU of plan, D max , HI, HTCI, D maxPTV , D meanPTV. Volume of PTV with the dose over 105% prescribed dose, dose of organ at risk, and Quality Assurance (QA) plan, are better than those of Wedge plan. Conclusions: Plans using Field in Field technique has better coverage, is more homogeneous in dose distribution than plan using Wedge technique. When using Field in Field technique for whole brain radiotherapy, using three subfields per field has better result than two subfields per field and one subfield per field.
In this paper, we present concepts of pre γp-open sets and pre γpclosures of a subset in a topolo... more In this paper, we present concepts of pre γp-open sets and pre γpclosures of a subset in a topological space, where γp is an operation on the family of all preopen sets of the topological space, and study some topological properties on them. As its application, we introduce the concept of pre γp-Ti spaces (i = 0, 1/2, 1, 2) and study some properties of these spaces.
Background: A project was implemented in 2010 to improve TB notification and TB screening and dia... more Background: A project was implemented in 2010 to improve TB notification and TB screening and diagnostic routines in large general hospitals. The aims of present study was to assess baseline TB screening and diagnostic practices in the three largest general hospitals in Vietnam. Objectives: To assess baseline TB screening and diagnostic practices in the three largest general hospitals in Vietnam. Method: The study had three elements: 1) Focus group discussions with hospital physicians; 2) review of hospital records and structured interviews of people who had a chest X-ray on any indication; and 3) record reviews and structured interviews of people newly diagnosed with TB. Results: The most commonly reported diagnostic pathway for pulmonary TB was chest X-ray followed by sputum-smear microscopy. Among 599 individuals who had a chest X-ray performed, 391 (65.1%) had recorded any abnormality, significantly higher in males (73.8%) than in females (54.7%), (p < 0.001), and the proportion was increasing with age (p <0.001). Among those with abnormal chest X-ray, 245 (69.2%) were investigated with sputum smear microscopy, and 49 (20%) were diagnosed with TB, of which 33 (13.5%) were smear-positive. Of 103 consecutive TB cases enrolled in the study, 92 (90%) had chest X-ray as the initial test. Sixty-three (61.2%) fulfilled the TB suspect criteria based on respiratory symptoms (productive cough >2 weeks). Conclusion: Chest X-ray is the preferred first test for TB in the largest hospitals in Vietnam. Chest X-ray is a sensitive screening tool for TB, which should be followed by a confirmatory TB test. While the majority of those with chest X-ray abnormalities are investigated with smear-microscopy, the high sputum-smear positivity ratio among them suggests that sputum-smear microscopy is done mainly for persons with quite clear TB signs or symptoms. TB screening and use of confirmatory diagnostic tests on wider indications seem warranted.
One new flavone derivative, urinariaflavone (1), and eight known compounds (2-9) were isolated fr... more One new flavone derivative, urinariaflavone (1), and eight known compounds (2-9) were isolated from the methanolic extract of Phyllanthus urinaria L. leaves. Their structures were established by MS, 1D and 2D NMR experiments, and comparison with literature data. All isolated compounds were tested for their cytotoxic activity against CHO (Chinese hamster ovary) and J774 (Murine macrophage) cell lines. Cytotoxic effects (IC 50 s $ 6.00-41.30 mM) on both cell lines were observed for compounds 4, 5, and 7.
International Journal of Medical Physics, Clinical Engineering and Radiation Oncology, 2020
Aims: This study compares data between the Field in Field planning and Wedge planning techniques ... more Aims: This study compares data between the Field in Field planning and Wedge planning techniques to figure out which technique has better dose coverage and distribution for PTV, and, if using FiF technique for whole brain treatment, how many beams will have better plan. Methods: 56 patients, who need to radiate whole brain with 30 Gy/10 fractions, have been selected for this study. Four plans have been made for each patient (FiF1-one subfield per field plan, FiF2-two subfields per field plan, FiF3-three subfields per field plan, and a Wedge plan). Results: The results of Field in Field plans including Compare dose distribution on the transverse CT slice, plan evaluation using DVH, number MU of plan, D max , HI, HTCI, D maxPTV , D meanPTV. Volume of PTV with the dose over 105% prescribed dose, dose of organ at risk, and Quality Assurance (QA) plan, are better than those of Wedge plan. Conclusions: Plans using Field in Field technique has better coverage, is more homogeneous in dose distribution than plan using Wedge technique. When using Field in Field technique for whole brain radiotherapy, using three subfields per field has better result than two subfields per field and one subfield per field.
In this paper, we present concepts of pre γp-open sets and pre γpclosures of a subset in a topolo... more In this paper, we present concepts of pre γp-open sets and pre γpclosures of a subset in a topological space, where γp is an operation on the family of all preopen sets of the topological space, and study some topological properties on them. As its application, we introduce the concept of pre γp-Ti spaces (i = 0, 1/2, 1, 2) and study some properties of these spaces.
Background: A project was implemented in 2010 to improve TB notification and TB screening and dia... more Background: A project was implemented in 2010 to improve TB notification and TB screening and diagnostic routines in large general hospitals. The aims of present study was to assess baseline TB screening and diagnostic practices in the three largest general hospitals in Vietnam. Objectives: To assess baseline TB screening and diagnostic practices in the three largest general hospitals in Vietnam. Method: The study had three elements: 1) Focus group discussions with hospital physicians; 2) review of hospital records and structured interviews of people who had a chest X-ray on any indication; and 3) record reviews and structured interviews of people newly diagnosed with TB. Results: The most commonly reported diagnostic pathway for pulmonary TB was chest X-ray followed by sputum-smear microscopy. Among 599 individuals who had a chest X-ray performed, 391 (65.1%) had recorded any abnormality, significantly higher in males (73.8%) than in females (54.7%), (p < 0.001), and the proportion was increasing with age (p <0.001). Among those with abnormal chest X-ray, 245 (69.2%) were investigated with sputum smear microscopy, and 49 (20%) were diagnosed with TB, of which 33 (13.5%) were smear-positive. Of 103 consecutive TB cases enrolled in the study, 92 (90%) had chest X-ray as the initial test. Sixty-three (61.2%) fulfilled the TB suspect criteria based on respiratory symptoms (productive cough >2 weeks). Conclusion: Chest X-ray is the preferred first test for TB in the largest hospitals in Vietnam. Chest X-ray is a sensitive screening tool for TB, which should be followed by a confirmatory TB test. While the majority of those with chest X-ray abnormalities are investigated with smear-microscopy, the high sputum-smear positivity ratio among them suggests that sputum-smear microscopy is done mainly for persons with quite clear TB signs or symptoms. TB screening and use of confirmatory diagnostic tests on wider indications seem warranted.
One new flavone derivative, urinariaflavone (1), and eight known compounds (2-9) were isolated fr... more One new flavone derivative, urinariaflavone (1), and eight known compounds (2-9) were isolated from the methanolic extract of Phyllanthus urinaria L. leaves. Their structures were established by MS, 1D and 2D NMR experiments, and comparison with literature data. All isolated compounds were tested for their cytotoxic activity against CHO (Chinese hamster ovary) and J774 (Murine macrophage) cell lines. Cytotoxic effects (IC 50 s $ 6.00-41.30 mM) on both cell lines were observed for compounds 4, 5, and 7.
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