記述言語：日本語   出版者・発行元：新潟大学医学部保健学科  

放射線治療の呼吸同期照射において，同期信号の発生からビームオン・オフまでには遅延時間（time\ndelay）がある．今回，time delayの計測に適した動体ファントムの運動パターンと，新潟大学医歯学総合病院の呼吸同期照射システムにおけるtime delayを明らかにすることを目的として検討を行った．動体ファントムの運動波形はサイン波形と等速波形とし，運動幅は30 mmとした．ラジオクロミックフィルムを動体ファントムに乗せ，直径4 mm coneで連続照射を行ったところ，フィルム上の照射陰影はサイン波形で31.7±0.2mm，等速波形で30.4±0.1 mmであり，等速波形の方が実際の運動幅に近く，測定精度が高かった．次に等速波形を用いた10-40%位相の同期照射を行い，照射陰影の長さを理論値と比較したところ，time delayはビームオンで0.11±0.01秒，ビームオフで0.07±0.00秒であった．
In respiratory gated radiotherapy, there are time delays between the target entering the gated region and treatment beam on, and between the target exiting the gated region and treatment beam off. The aim of this study was to clarify the appropriate motion profile of motion phantom for measuring the time delays, and to measure the beam on and beam off time delays in respiratory gated radiotherapy system at Niigata University Medical and Dental Hospital. We irradiated radiochromic films on the motion phantom using 4 mm diameter cone without gating. As a motion profile for the motion phantom (motion width: 30.0 mm), a sinusoidal profile and a constant velocity profile ware used. Measured length of the exposure streaks on the films were more accurate with the constant velocity profile than those with the sinusoidal profile (30.4±0.1 mm vs. 31.7±0.2 mm). Then we used the constant velocity profile for gating irradiation with a gating phase range of 10-40%, and compared the exposure streak length with a theoretical value. The calculated beam on time delay was 0.11±0.01 sec, and the beam off time delay was 0.07±0.00 sec.

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その他リンク： http://id.ndl.go.jp/bib/028095487

記述言語：日本語   出版者・発行元：電子情報通信学会  

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記述言語：日本語   出版者・発行元：新潟大学医学部保健学科  

看護学専攻３年次対象の『がん看護論』では「がん患者体験演習」を実施している。本演習の学習成果と課題を見出すことを目的に，平成23年度から平成26年度の演習上による学生の記載内容と自由記載からの集計および質的分析をした。結果，学生は，演習でがん患者の立場からあきらめるものについては『形のある大切なもの』，『大切な人』，『大切な活動』，『形のない大切なこと』を選択し，発症時期や告知の時期では『大切な活動』，『形のある大切なもの』を優先的に選択していた。この選択は調査年度が変わっても同じ傾向であった。自由記載の分析結果では，【取捨選択をするという困難さの体感】，【がん患者が体験する喪失感の共有】，【人・ものの存在意義に対するあらたな認識】，【がん患者の支援方法を再考察する機会】の４カテゴリーが抽出された。これらから，本演習での学生の学習成果は一定しており，がん患者の生活と治療を模擬体験し，支援方法を考える機会になったと考えられた。
“Practical Training in Caring for Cancer Patients” is offered in “Cancer Nursing Theory Course”, which is intended for juniors majoring in nursing. For the purpose of finding learning achievements and issues of this training program, we compiled and performed a qualitative analysis of student notes and free comments made during the program between 2011 and 2014. As a result, the students put themselves in cancer patients’ position during the program and at onset or notification of the disease preferentially gave up “important activities” and “important things that are tangible” from “important things that are tangible,” “important people,” “important activities,” and “important things that are intangible.” This choice tended to be the same for all the academic years. An analysis of the student comments identified four categories: “experience of difficulty in making a choice,” “sharing of the sense of loss that cancer patients experience,” “renewed awareness of the significance of existence of humans and things,” and “opportunity to reconsider ways to support cancer patients.” These data revealed that the students’learning achievements of this training program were constant, and the students simulated the lives and therapies of cancer patients, making the experience an opportunity to consider ways to support these patients.

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その他リンク： http://id.ndl.go.jp/bib/027134573

記述言語：日本語   出版者・発行元：公益社団法人 日本放射線技術学会  

DOI： 10.6009/jjrt.2012_jsrt_68.1.15

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その他リンク： https://search.jamas.or.jp/link/ui/2012174221

記述言語：日本語   出版者・発行元：公益社団法人 日本放射線技術学会  

To estimate the collimator scatter factor, <i>S</i>_c of small field sizes in which a mini-phantom cannot be fully included at the nominal treatment distance (NTD=100 cm), we measured the in-air output of 4 MV and 10 MV X-rays of a Varian’s Clinac 2100 C/D using a mini-phantom at NTD and at a long source-to-chamber distance (SCD=200 cm) with field-size defined at the isocenter down to 4.6×4.6cm² and 2.3×2.3cm², respectively. We then compared the fitted curve to the NTD dataset by a cumulative exponential distribution model with that by a cumulative Gaussian distribution (error function) model containing a zero-field extrapolated term derived from the long SCD dataset. The results showed that the zero-field extensions of two fitted curves coincided for a 4 MV X-ray, but a large discrepancy was seen between them for a 10 MV X-ray. Therefore, the <i>S</i>_c of small field sizes not measurable using a mini-phantom at the NTD can be well estimated by applying the cumulative exponential model to the NTD dataset in the case of a 4 MV X-ray beam filtrated with a cone-shaped flattener. However, to estimate the <i>S</i>_c of such small field sizes in the case of a 10 MV X-ray beam filtrated with a bell-shaped flattener, we consider it preferable to also measure in-air output at a long SCD and to apply the cumulative Gaussian model as described here.

DOI： 10.6009/jjrt.64.306

DOI： 10.6009/jjrt.2012_jsrt_68.1.15_references_DOI_Pw9FOmBQ8PVhnFTUZpnLA1VecyQ

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その他リンク： https://search.jamas.or.jp/link/ui/2008169312

記述言語：日本語   出版者・発行元：公益社団法人 日本放射線技術学会  

We estimated collimator scatter factor, <i>S</i>_c, of symmetric rectangular fields of any size by applying a two-component scatter model to measured in-air output data in width and length directions of measured rectangles. The in-air output was measured for symmetric rectangles with combined width and length sizes of 7 × 7 and 6 × 6 using 10 MV and 4 MV X-rays of Varian’s Clinac 2100 C/D, respectively. The model consists of scatter components from the primary collimator and flattening filter and from the collimator jaws: the former shows a saturation curve and the latter increases linearly with enlarging field size. This model was fitted to the measured dataset firstly in the width and secondly in the length directions of rectangles; then, by compiling interpolated matrix data, the <i>S</i>_c table of symmetric rectangles was constructed. In addition, using this <i>S</i>_c table, values of <i>S</i>_c were calculated for a few asymmetric rectangles by Day’s method, and were in good agreement with measured values. Therefore, we think that our method is practical and precise for constructing the <i>S</i>_c table of symmetric rectangles from measured data, and that using this table, the <i>S</i>_c of any asymmetric rectangles may be calculated.

DOI： 10.6009/jjrt.64.1217

DOI： 10.6009/jjrt.2012_jsrt_68.1.15_references_DOI_6W2V721cyfqep0xLZP8EbrLS9I0

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その他リンク： https://search.jamas.or.jp/link/ui/2009006389

記述言語：日本語   出版者・発行元：公益社団法人 日本放射線技術学会  

DOI： 10.6009/jjrt.62.1675

DOI： 10.6009/jjrt.64.306_references_DOI_Pm0XdMg69CjvGKmPLkq07nufJ6X

PubMed

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その他リンク： https://search.jamas.or.jp/link/ui/2007118876