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Related Concept Videos

Common Leveling Mistakes and Errors01:17

Common Leveling Mistakes and Errors

A survey team is tasked with determining the elevation difference between points Point A and Point B, separated by uneven terrain. They use a leveling instrument and a leveling rod.Common MistakesMisreading the Rod: During a backsight reading at Point A, the instrumentman observes the rod partially obscured by tall grass. Instead of reading 1.135 m, they mistakenly record 1.735 m due to the misalignment of the crosshair with the wrong graduation. This error adds 0.600 m to all subsequent...
Adjusting a Traverse01:12

Adjusting a Traverse

In the site survey of a four-sided traverse, internal angles are essential to ensure geometric accuracy. The survey revealed that the sum of the measured internal angles was 359 degrees and 48 minutes, which is 12 minutes less than the expected 360 degrees. This discrepancy signals an error likely arising from measurement inaccuracies during the fieldwork.To rectify this error, the adjustment process involved distributing the 12-minute shortfall equally across the four internal angles. By...
Accuracy and Precision01:52

Accuracy and Precision

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 measurements...
Accuracy and Precision01:52

Accuracy and Precision

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 measurements...
Uncertainty in Measurement: Reading Instruments02:46

Uncertainty in Measurement: Reading Instruments

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...
Uncertainty in Measurement: Accuracy and Precision03:37

Uncertainty in Measurement: Accuracy and Precision

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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Related Experiment Video

Updated: May 19, 2026

Accuracy in Dental Medicine, A New Way to Measure Trueness and Precision
07:57

Accuracy in Dental Medicine, A New Way to Measure Trueness and Precision

Published on: April 29, 2014

[Image guidance for the evaluation of setup accuracy].

L Cartier1, M Alfonsi, N Pourel

  • 1Département de radiothérapie, institut Sainte-Catherine, Avignon, France. l.cartier@isc84.org

Cancer Radiotherapie : Journal De La Societe Francaise De Radiotherapie Oncologique
|August 28, 2012
PubMed
Summary
This summary is machine-generated.

Image-guided radiotherapy enables precise target volume repositioning. Daily imaging is crucial for controlling errors and adapting treatments, improving patient outcomes.

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Area of Science:

  • Radiation oncology
  • Medical imaging
  • Radiotherapy techniques

Context:

  • Advancements in image-guided radiotherapy (IGRT) allow for real-time target volume repositioning.
  • This technological evolution necessitates changes in clinical practice and positioning control protocols.

Purpose:

  • To outline the essential requirements for effective positioning control in IGRT.
  • To highlight the role of daily imaging in managing uncertainties.
  • To introduce the concept of adaptive radiotherapy enabled by IGRT.

Summary:

  • IGRT provides data for precise target volume repositioning.
  • Systematic control is needed for the initial 3-5 treatment sessions to manage errors.
  • Daily imaging is essential to address random repositioning errors and target motion.
  • IGRT facilitates the assessment of anatomical changes during treatment, paving the way for adaptive radiotherapy.

Impact:

  • Improved accuracy in radiation delivery.
  • Enhanced patient safety through rigorous error management.
  • Foundation for personalized cancer treatment via adaptive radiotherapy.