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Comparative evaluation of organ and effective doses for paediatric patients with those for adults in chest and abdominal CT examinations.
Effective doses in paediatric chest CT and abdominal CT examinations were lower than those in adult examinations by a factor of two or greater on average for the same CT scanners because of the lower effective mAs adopted in children's CT examinations. Expand
Membrane fusion plays an important role in gene transfection mediated by cationic liposomes
The results suggest that at least two steps are effective for gene transfection mediated by the cationic liposomes with cATIONic cholesterol derivatives, including the endocytosis of the liposome/DNA complex into the target cells and the removal of antisense oligonucleotides (plasmid DNAs) from the complex in the endosomes. Expand
Atomic force microscopy for studying gene transfection mediated by cationic liposomes with a cationic cholesterol derivative
From the results it was found that the vesicles with moderate diameters were moste effective for gene transfection of plasmid pSV2CAT DNA into the target cell. Expand
Evaluation of patient dose for barium enemas and CT colonography in Japan.
- Y. Hirofuji, T. Aoyama, S. Koyama, C. Kawaura, K. Fujii
- The British journal of radiology
- 1 March 2009
Patient doses for examinations of the lower digestive tract (barium enemas and CT colonography) in Japan were evaluated from in-phantom dose measurements using a dosemeter-implanted anthropomorphic phantom and from the knowledge of procedures of these examinations. Expand
Organ and effective dose evaluation in diagnostic radiology based on in-phantom dose measurements with novel photodiode-dosemeters.
- C. Kawaura, T. Aoyama, S. Koyama, Masataka Achiwa, Masaki Mori
- Radiation protection dosimetry
- 1 July 2006
The study showed that organ doses ranged from <0.01 to 0.72 mGy in routine X-ray radiography of chest and of abdomen and from 0.07 to 55.91 mGyIn routine computed tomography (CT) examinations with current multi-slice CT scanners, and the effective dose observed in the chest CT examination was approximately 300 times higher than that in chest radiography. Expand
Dose reduction and image quality in CT angiography for cerebral aneurysm with various tube potentials and current settings.
- K. Imai, M. Ikeda, C. Kawaura, T. Aoyama, Y. Enchi, M. Yamauchi
- The British journal of radiology
- 17 January 2012
The results suggested that the suitable tube potentials for axial CT and three-dimensional CT angiograms were 100 and 80 kVp, respectively, and the effective milliampere-second value recommended by the manufacturer was appropriate. Expand
Effect of zeta potential of cationic liposomes containing cationic cholesterol derivatives on gene transfection
- K. Takeuchi, M. Ishihara, C. Kawaura, M. Noji, T. Furuno, M. Nakanishi
- Chemistry, Medicine
- FEBS letters
- 18 November 1996
Eight cationic derivatives of cholesterol which contain a tertiary amino head group with a different spacer arm are synthesized and indicated that zeta potentials of cationIC liposomes were well related to transfection activity of pSV2CAT DNA. Expand
An in-phantom dosimetry system using pin silicon photodiode radiation sensors for measuring organ doses in x-ray CT and other diagnostic radiology.
The present dosimetry system having advantages of high sensitivity with immediate readout of dose values, low cost, and easy construction would widely be used as an alternative to TLD dosimeters for organ and skin dose measurements in CT and other diagnostic radiology. Expand
Evaluation of exposure dose to patients undergoing catheter ablation procedures—a phantom study
Patients that received high doses in ablation procedures were lung, followed by bone surface, esophagus, liver and red bone marrow, and effective doses were 7.9–34.8 mSv, which enabled us to estimate patient exposure in real time by using monitored values of DAP. Expand
Evaluation of Organ and Effective Doses for Various Head X-ray Examinations Based on In-phantom Dosimetry
蛍光ガラス線量計とフォトダイオード線量計を設置した人体ファントム線量計測システムを用いて, 頭部一般撮影検査及び頭部X線CT検査における患者の臓器及び実効線量評価を行った。5種類の頭部一般撮影検査における脳線量は, 0.46～1.08mGyであった。水晶体線量は, 水晶体に直接X線が当たるような頭部正面 (AP) 及びタウン撮影法において最も高かった。また, 頭部一般撮影検査における実効線量は,… Expand