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相关概念视频

Uncertainty in Measurement: Accuracy and Precision03:37

Uncertainty in Measurement: Accuracy and Precision

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Scientists typically make repeated measurements of a quantity to ensure the quality of their findings and to evaluate both the precision and the accuracy of their results. Measurements are said to be precise if they yield very similar results when repeated in the same manner. A measurement is considered accurate if it yields a result that is very close to the true or the accepted value. Precise values agree with each other; accurate values agree with a true value. 
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Accuracy and Precision01:52

Accuracy and Precision

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Scientists typically make repeated measurements of a quantity to ensure the quality of their findings and to evaluate both the precision and the accuracy of their results. Measurements are said to be precise if they yield very similar results when repeated in the same manner. A measurement is considered accurate if it yields a result that is very close to the true or the accepted value. Precise values agree with each other; accurate values agree with a true value.  Highly accurate...
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Statistical Analysis: Overview01:11

Statistical Analysis: Overview

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When we take repeated measurements on the same or replicated samples, we will observe inconsistencies in the magnitude. These inconsistencies are called errors. To categorize and characterize these results and their errors, the researcher can use statistical analysis to determine the quality of the measurements and/or suitability of the methods.
One of the most commonly used statistical quantifiers is the mean, which is the ratio between the sum of the numerical values of all results and the...
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Uncertainty in Measurement: Reading Instruments02:46

Uncertainty in Measurement: Reading Instruments

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Counting is the type of measurement that is free from uncertainty, provided the number of objects being counted does not change during the process. Such measurements result in exact numbers. By counting the eggs in a carton, for instance, one can determine exactly how many eggs are there in the carton. Similarly, the numbers of defined quantities are also exact. For example, 1 foot is exactly 12 inches, 1 inch is exactly 2.54 centimeters, and 1 gram is exactly 0.001 kilograms. Quantities...
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Rules for Significant Figures01:44

Rules for Significant Figures

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In any measurement, the precision of the measuring tool is an essential factor. An ordinary ruler, for example, can measure length to the closest millimeter; a caliper, on the other hand, can measure length to the nearest 0.01 mm. As a result, the caliper is a more precise measurement tool because it can measure extremely minute changes in length. The measurements will be more accurate if the measuring tool is more precise.
It should be emphasized that when we represent measured values, the...
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Uncertainty in Measurement: Significant Figures03:34

Uncertainty in Measurement: Significant Figures

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All the digits in a measurement, including the uncertain last digit, are called significant figures or significant digits. Note that zero may be a measured value; for example, if a scale that shows weight to the nearest pound reads “140,” then the 1 (hundreds), 4 (tens), and 0 (ones) are all significant (measured) values.
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相关实验视频

Updated: Jul 27, 2025

Picometer-Precision Atomic Position Tracking through Electron Microscopy
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定量参数的精确性 定量参数的精确性

Bin Guo1, Li Hu2, Qijun Cai1

  • 1Department of Nuclear Medicine, The First Affiliated Hospital of Jinan University, Guangzhou, China.

Quantitative imaging in medicine and surgery
|June 7, 2023
PubMed
概括

这项研究确定了VX2瘤子模型中18F-FDG PET/CT成像的精度. 结果显示了测量变异性,以准确评估固体瘤中的治疗效果.

关键词:
精确度 精确度 精确度 精确度在VX2瘤模型中.-18氧葡萄糖正子发射断层扫描/计算机断层扫描 (18F-FDG PET/CT)最少显著的变化 (LSC)

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相关实验视频

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科学领域:

  • 核医学就是核医学.
  • 在瘤学瘤学.
  • 医疗成像医学成像

背景情况:

  • 来自18F-FDG PET/CT的定量参数对于评估固体瘤治疗疗效至关重要.
  • 了解测量误差 (精度) 对于区分真正的生物变化和技术变化至关重要.

研究的目的:

  • 建立一种方法来评估在子VX2瘤模型中的定量18F-FDG PET/CT参数的精度.
  • 为了确定关键成像生物标志物的最不显著变化 (LSC).

主要方法:

  • 18只携带VX2瘤的子在连续三天内进行了重复的18F-FDG PET/CT扫描.
  • 使用PET VCAR软件分析了标准化吸收值 (SUV) 和瘦身量校正的SUV (SUL) 参数.
  • 精度是使用变化系数 (RMS-CV) 和标准偏差 (RMS-SD) 的平方根平均值来量化.

主要成果:

  • 对于SUV参数 (SUVmax,SUVmean,SUVpeak) 的精度在18.3%至18.8%之间.
  • 对于SUL参数 (SULpeak) 的精度在18.0%至18.4%之间.
  • 在SUVmax的95%置信区间中,最小显著变化 (LSC) 为50.1%,SULpeak为51.0%.

结论:

  • 在临床前VX2瘤模型中建立了一种评估18F-FDG PET/CT精度的强大方法.
  • 这种方法支持在实验性药物研究期间精确监测实体瘤的治疗反应.