Patient beam positioning system using CT images

Endo, Masahiro; Kutsutani-Nakamura, Y; Murakami, Yuji; Shishido, Fumio; Iinuma, Takeshi; Tsunemoto, H; Inoue, Masaaki; Oshima, Masaki

doi:10.1088/0031-9155/27/2/011

Cited by 6 publications

(3 citation statements)

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“…The net reaction produced by adding H20 to the immersion solution can be thus represented as in Eq. 5 5H2SiF6 + SiO2 + 6H20 -) 4SiF~ + 2St(OH)4 + 6HF + 8H + [5] Our Si wafers were cleaned using the standard RCA process, which leaves a thin native-oxide layer on the surface. The wafers were then dipped in HF solution to remove the native oxide in HC1 + H~O~ mixed solution during initial cleaning.…”

Section: Methodsmentioning

confidence: 99%

Controlling Fluorine Concentration and Thermal Annealing Effect on Liquid‐Phase Deposited SiO2 − x F x Films

Yeh

Chen

1995

J. Electrochem. Soc.

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Silicon oxide (SiO2_=F~) with fluorine naturally incorporated can be prepared by the liquid-phase deposition (LPD) method at 15~ The fluorine is uniformly distributed in the bulk of the LPD oxide. The fluorine incorporation as well as the qualitative properties can be accurately controlled by varying the amount of H20 added. A high temperature process has considerable effect on the low temperature fluorinated oxide. FTIR and XPS spectra show that Si-F and SiO~H bonds can restructure with densification at higher thermal annealing temperature, and that restructuring is a function of temperature. Film densification with increasing temperature is also discussed in terms of St-O-St bond angle and Si~Si bond length.

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Section: Methodsmentioning

confidence: 99%

Controlling Fluorine Concentration and Thermal Annealing Effect on Liquid‐Phase Deposited SiO2 − x F x Films

Yeh

Chen

1995

J. Electrochem. Soc.

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Section: Introductionmentioning

confidence: 99%

“…Since the simulator offers accurate reproduction of treatment geometry and the CT scanner offers accurate determination of patient spatial and electron density information, various researchers and manufacturers have combined the two into one device (3,4), or electronically simulated beam positioning on a CT scanner (5,6). In addition to the added complexity and expense of these devices, drawbacks and problems have been encountered in registering and combining the transaxial planar tomographic geometry desirable for computerized treatment planning with the planar projection radiographic data desirable for portal size and placement simulation (7).…”

Section: Introductionmentioning

confidence: 99%

<title>A Study Of The Potential For Digital Radiographic Data Acquisition For Radiation Therapy Treatment Planning</title>

1983

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While the quantitative nature of digital fluroscopic and digital radiographic imaging would seem to make possible many radiotherapeutic applications, significant problems must first be solved.The purpose of this study is to examine the potential benefits of digital imaging in radiation therapy, identify what problems must be solved to attain these benefits, and attempt to make some assessment as to the relative merits of developing such technologies.Among the potential benefits are ability to do contrast -subtraction studies for tumor and /or normal structure localization and portal placement, digital simulation of portal placement and treatment delivery, spatial localization and digitization of inhomogeneity boundaries, spatial localization and digitization of brachytherapy sources, and quantitative inhomogeneity acquisition for dosimetry calculations. Significant problems which must be solved include image receptor size limitations, image acquisition geometry related spatial distortion, three dimensional region calculation from limited views, and physical interpretation of digital image grey levels.

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The CT-simulator and the Simulator-CT: Advantages, Disadvantages, and Future Developments

Galvin

1995

Radiation Therapy Physics

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Patient beam positioning system using CT images

Cited by 6 publications

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Controlling Fluorine Concentration and Thermal Annealing Effect on Liquid‐Phase Deposited SiO2 − x F x Films

Controlling Fluorine Concentration and Thermal Annealing Effect on Liquid‐Phase Deposited SiO2 − x F x Films

<title>A Study Of The Potential For Digital Radiographic Data Acquisition For Radiation Therapy Treatment Planning</title>

The CT-simulator and the Simulator-CT: Advantages, Disadvantages, and Future Developments

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