直腸がん放射線治療における軸固有のセットアップエラーの評価:ボディ・マス・インデックス・コレレーションとコンビビーム・コンピュータ・トモグラフィーベースの研究
Ainain Yousuf Baba1, Abid Ahmad2, Obair Yousuf Baba3
1Department of Physics, University of Kashmir, Srinagar, Jammu and Kashmir, India.
Journal of medical physics
|February 13, 2026
まとめ
直腸がんの正確な放射線治療には,日々の画像ガイドラインによって情報提供される特定の計画目標量 (PTV) の限界が必要です. ボディマス指数 (BMI) はセットアップの精度に影響を与え,個別化されたアプローチが必要になります.
科学分野:
- 放射線腫瘍学 放射線腫瘍学
- 医学物理 医学物理学
- 放射線治療のプランニング
背景:
- 画像誘導放射線療法 (IGRT) は,腫瘍を正確に標的にするために不可欠です.
- 患者の正確な位置づけは,健康な組織への放射線量を最小限に抑えるために不可欠です.
- セットアップエラーを理解することは,治療マージンを最適化するための鍵です.
研究 の 目的:
- 放射線治療を受けている直腸がん患者のセットアップエラーを定量化するために.
- 最適な臨床目標量 (CTV) から計画目標量 (PTV) のマージンを導き出す.
- セットアップの精度に対するボディマス指数 (BMI) の影響を評価する.
主な方法:
- 41人の直腸がん患者からの,1102人の毎日のコーンビームコンピュータトモグラフィー (CBCT) スキャンを分析した.
- 中側側 (X),頭蓋骨後部 (Y),前後部 (Z) の転移シフトの測定.
- 系統的 (Σ) とランダム的 (σ) のエラーの計算は,PTVマージン導出のためのヴァン・ヘルク式を用いて行われます.
主要な成果:
- すべての軸 (X:0.04 mm,Y:0.57 mm,Z:0.13 mm) で観察された低平均のシステマティックセットアップエラー.
- 派生したPTVマージンは7.4mm (X),9.1mm (Y),9.7mm (Z) でした.
- BMIとZ軸のセットアップエラー (r=0.55,P=0.002) の間に有意な正の相関が認められ,割数の23.1%が5mm以上の補正を必要とした.
結論:
- アクシス固有のPTVマージンは,解剖学的変動性のために,直腸がん放射線治療に必要である.
- 日々のCBCTは,セットアップの精度と治療の精度を大幅に改善します.
- BMIなどの要因を考慮した個別化プランニングは,最適な結果のために推奨されます.
さらに関連する動画
05:37Cone Beam Intraoperative Computed Tomography-based Image Guidance for Minimally Invasive Transforaminal Interbody Fusion
Published on: August 6, 2019
6.9K
15:18Near Infrared Optical Projection Tomography for Assessments of β-cell Mass Distribution in Diabetes Research
Published on: January 12, 2013
17.0K
関連する概念動画
Assessing Body Temperature - Rectal
12.7K
Rectal temperature measurement is considered the most precise method for assessing core body temperature and typically registers higher than oral temperature. For adults, the rectal thermometer should be inserted 1 to 1.5 inches into the rectum to obtain the most accurate reading.
Follow these steps for rectal temperature assessment:
Step 1: Perform hand hygiene and don clean gloves to prevent cross-infection.
Step 2: Position the patient in a side-lying position to better visualize the rectal...
Follow these steps for rectal temperature assessment:
Step 1: Perform hand hygiene and don clean gloves to prevent cross-infection.
Step 2: Position the patient in a side-lying position to better visualize the rectal...
12.7K
Imaging Studies III: Computed Tomography
410
DefinitionComputed Tomography (CT) of the genitourinary (GU) tract is a non-invasive imaging modality that utilizes X-rays and computer processing to generate detailed cross-sectional images of the urinary system, encompassing the kidneys, ureters, bladder, and adjacent structures such as the adrenal glands.PurposeCT scans of the GU tract serve several diagnostic and therapeutic purposes, including:Diagnosis of Urinary Tract Diseases: Detects kidney stones, tumors, cysts, and congenital...
410
Computed Tomography
8.9K
Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
The technique was invented in the 1970s and is based on the principle that as X-rays pass through the body, they are absorbed or reflected at different levels. In the technique, a patient lies on a motorized platform while a computerized axial tomography (CAT) scanner rotates...
The technique was invented in the 1970s and is based on the principle that as X-rays pass through the body, they are absorbed or reflected at different levels. In the technique, a patient lies on a motorized platform while a computerized axial tomography (CAT) scanner rotates...
8.9K
Correlations
36.6K
Correlation means that there is a relationship between two or more variables (such as ice cream consumption and crime), but this relationship does not necessarily imply cause and effect. When two variables are correlated, it simply means that as one variable changes, so does the other. We can measure correlation by calculating a statistic known as a correlation coefficient. A correlation coefficient is a number from -1 to +1 that indicates the strength and direction of the relationship between...
36.6K
Reduced Mass Coordinates: Isolated Two-body Problem
2.4K
In classical mechanics, the two-body problem is one of the fundamental problems describing the motion of two interacting bodies under gravity or any other central force. When considering the motion of two bodies, one of the most important concepts is the reduced mass coordinates, a quantity that allows the two-body problem to be solved like a single-body problem. In these circumstances, it is assumed that a single body with reduced mass revolves around another body fixed in a position with an...
2.4K
Hypothalamic-Pituitary Axis
66.6K
The response to stress—be it physical or psychological, acute or chronic—involves activation of the Hypothalamic-Pituitary-Adrenal (HPA) axis. The HPA axis is part of the neuroendocrine system because it involves both neuronal and hormonal communication. Its function is to regulate homeostatic systems—metabolic, cardiovascular, and immune—providing the necessary means to respond to a stressor.
66.6K
