関連する実験動画
Updated: May 11, 2026

13:37
Polymer Microarrays for High Throughput Discovery of Biomaterials
Published on: January 25, 2012
14.7K
組織等価のポリマーゲルを用いたビーム範囲測定と直接比較によるプロトアコースティック範囲の検証
Takeshi Miyashita1, Ye Chen1, Yasutoshi Kuriyama2
1Faculty of Engineering, Hokkaido University, Sapporo, Japan.
まとめ
ポリマーゲル用ドジメーターは,プロトンビームの範囲を直接測定し,プロトン療法における原音響測定を検証する. この方法は,より高い精度のためにモンテカルロシミュレーションに関連する不確実性を回避します.
科学分野:
- 医学物理学
- 放射線腫瘍学
- バイオメディカルエンジニアリング
背景:
- プロトアコースティクスは,陽子療法のインビボ範囲の検証に希望を示しています.
- 従来の組織模倣ファントム (TMP) は,基底の真実のためにモンテカルロ (MC) シミュレーションに依存し,エラーを導入することができます.
- MCシミュレーションの不確実性は,材料の性質と用量モデルの不正確性から生じる.
研究 の 目的:
- 併用用用量分布と原音響測定のための新しいTMPを提案し,評価する.
- プロトアコースティック範囲の検証でMCシミュレーションの必要性を排除する.
- 陽子療法における in vivo 範囲の検証の精度を向上させるため
主な方法:
- TMPとしてノルモキシックN-ビニルピロリドン基ポリマーゲル用量計を使用した.
- 226.5 MeVの陽子束で照射され,磁気共鳴画像を用いて分析された.
- 光学式水声器で測定した原音域 (到着時間およびシミュレーションベースの方法).
主要な成果:
- ゲル用量計とプロトアコースティック範囲の違いは,両方のゲルサイズで1mm以内でした.
- プロトアコースティック範囲は,MCシミュレーションと比較して最大2.1mmの偏差を示しました.
- MCシミュレーションとの不一致は,想定された材料の性質の不正確さによる可能性があります.
結論:
- ポリマーゲル用ドジメーターは,原音域測定のための直接的な検証方法を提供します.
- このアプローチはMCシミュレーションに固有の不確実性を回避します.
- 臨床用プロトンビームでより信頼性の高い in vivo 範囲の検証を可能にします.
関連する概念動画
Real Time RT-PCR
Real-time reverse transcription-polymerase chain reaction, or Real-time RT-PCR, is an analytical tool used to determine the expression level of target genes. The method involves converting mRNA to complementary DNA with the help of an enzyme known as reverse transcriptase, followed by the PCR amplification of the cDNA. These two processes can be performed simultaneously in a single tube or separately as a two-step reaction.
The real-time quantification of the number of amplified products is...
The real-time quantification of the number of amplified products is...
¹H NMR Signal Integration: Overview
The intensity of a signal, which can be represented by the area under the peak, depends on the number of protons contributing to that signal. The area under each peak is shown as a vertical line called an integral, with the integral value listed under it, as seen in the proton NMR spectrum of benzyl acetate. Each integral value is divided by the smallest integral value to obtain the ratio of the number of protons producing each signal. The ratio reveals the relative number of protons and not...
Sampling Methods: Overview
A sample refers to a smaller subset representative of a larger population. In analytical chemistry, studying or analyzing an entire population is often impractical or impossible. Therefore, samples are used to draw inferences and generalize the whole population. The sampling method selects individuals or items from a population to create a sample. Standard sampling methods include random, judgemental, systematic, stratified, and cluster sampling.
In analytical chemistry, the choice of sampling...
In analytical chemistry, the choice of sampling...
Sample Preparation for Analysis: Advanced Techniques
Accurate analysis of complex samples often requires advanced preparation techniques to achieve reliable and reproducible results. Samples containing inorganic or organic materials can be challenging to dissolve or decompose effectively. Standard sample preparation methods include acid digestion, fusion, dry ashing, and wet digestion.
Acid digestion with strong acids is commonly used to dissolve inorganic materials that are insoluble (do not dissolve) in water. This method can be useful for...
Acid digestion with strong acids is commonly used to dissolve inorganic materials that are insoluble (do not dissolve) in water. This method can be useful for...
Measurement of Air Content in Concrete
Air content measurement in concrete is critical for ensuring structural integrity and durability of concrete structures, especially in environments prone to severe weather conditions. Accurate air content analysis optimizes concrete's resistance to freeze-thaw cycles and enhances its workability and strength. Several methods are standardized under ASTM guidelines to measure the air content in fresh concrete, each suitable for different concrete types and conditions.
The pressure method,...
The pressure method,...
Electronic Distance Measuring Instruments
Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over short distances...

