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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 measurements...

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Related Experiment Video

Updated: Jun 23, 2026

Evidence-based Knowledge Synthesis and Hypothesis Validation: Navigating Biomedical Knowledge Bases via Explainable AI and Agentic Systems

Evidence-based Knowledge Synthesis and Hypothesis Validation: Navigating Biomedical Knowledge Bases via Explainable AI and Agentic Systems

Published on: June 13, 2025

Accuracy and precision of an IGRT solution.

Gareth J Webster¹, Carl G Rowbottom, Ranald I Mackay

¹North Western Medical Physics, Christie Hospital NHS Trust, Manchester, United Kingdom. Gareth.Webster@physics.cr.man.ac.uk

Medical Dosimetry : Official Journal of the American Association of Medical Dosimetrists

|May 5, 2009

Summary

Image-guided radiotherapy (IGRT) enhances treatment accuracy by verifying patient anatomy. This study found IGRT improves dose verification for complex head-and-neck intensity modulated radiotherapy (IMRT), with delivery accuracy within +/- 3%.

Related Experiment Videos

Last Updated: Jun 23, 2026

Evidence-based Knowledge Synthesis and Hypothesis Validation: Navigating Biomedical Knowledge Bases via Explainable AI and Agentic Systems

Evidence-based Knowledge Synthesis and Hypothesis Validation: Navigating Biomedical Knowledge Bases via Explainable AI and Agentic Systems

Published on: June 13, 2025

Area of Science:

Medical Physics
Radiation Oncology
Radiotherapy Technology

Background:

Image-guided radiotherapy (IGRT) offers potential for improved accuracy in radiation delivery.
Complex intensity-modulated radiotherapy (IMRT) for head-and-neck cancers requires precise dose delivery.
Verification of dose accuracy is crucial for patient safety and treatment efficacy.

Purpose of the Study:

To investigate the achievable accuracy and precision of complex head-and-neck IMRT plans using an IGRT technique.
To evaluate the effectiveness of IGRT in dose verification for IMRT.
To identify potential sources of error in image-guided IMRT delivery.

Main Methods:

Four head-and-neck IMRT plans were delivered to a phantom.
Dose distribution was measured using microMOSFET detectors.
Volumetric kilovoltage (kV) x-ray images were acquired and fused for dose recalculation.

Main Results:

The average measured dose was systematically 1.4% lower than predicted.
10/76 measurements showed a systematic error > 3%, primarily in beam penumbrae due to positional errors.
Achievable accuracy of IMRT dose delivery with IGRT was within +/- 3%.

Conclusions:

IGRT implementation improves dose verification accuracy, especially in high-dose gradients.
Submillimeter positional errors can cause significant dose discrepancies in high-dose gradient regions.
The precision of the IMRT delivery system was within 1.5% (1 SD), comparable to detector noise.