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Quality Assurance

Quality Assurance

Quality assurance is the overarching term used to describe the activities employed to ensure the proper performance of a system. These activities can be classified into three categories: quality control, quality assessment, and internal corrective measures. Typically, these activities work cyclically: quality control is performed before and during the analysis, while quality assessment occurs during and after the investigation. Internal corrective measures are implemented based on the findings...

Quality Control

Quality Control

Quality control is one of the three cyclical quality assurance activities that help keep a system under statistical control. Typical quality control activities include creating quality control charts, conducting proficiency testing, and documenting and archiving results.
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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...

Protein Folding Quality Check in the RER

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Related Experiment Video

Updated: Jun 1, 2026

Quantifying X-Ray Fluorescence Data Using MAPS

Quantifying X-Ray Fluorescence Data Using MAPS

Published on: February 17, 2018

RapidArc quality assurance through MapCHECK.

Aime M Gloi¹, Robert E Buchana, Corrie L Zuge

¹Radiation Oncology, St Vincent Hospital, Green Bay, Wisconsin 54307, USA. agloi@stvgb.org

Journal of Applied Clinical Medical Physics

|May 19, 2011

Summary

This study developed a patient-specific quality assurance (QA) procedure for RapidArc radiotherapy. The new method uses the MapCHECK detector array and an ion chamber, achieving a 97.52% passing rate for accurate radiation delivery.

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Area of Science:

Medical Physics
Radiation Oncology
Radiotherapy Quality Assurance

Background:

RapidArc radiotherapy offers precise radiation delivery but requires rigorous patient-specific quality assurance.
Existing QA methods may not fully capture the complexities of volumetric modulated arc therapy (VMAT).

Purpose of the Study:

To develop and validate a patient-specific quality assurance (QA) procedure for RapidArc radiotherapy.
To integrate the MapCHECK detector array with ion chamber measurements for comprehensive QA.

Main Methods:

Utilized an existing MapCHECK system and a Solid Water phantom with an embedded ion chamber.
Developed a QA procedure for RapidArc treatments post-commissioning.
Employed partial arcs from the treatment planning system with MapCHECK to assess dose distribution and angular dependence.
Measured absolute doses using an ion chamber surrounded by 6 cm of Solid Water.

Main Results:

Ion chamber measurements of absolute dose were within 1% of predictions from the Eclipse treatment system.
A 97.52% average passing rate was achieved using a partial arc (60°-300°) on the MapCHECK array with a gamma index criteria of 3%, 3 mm, and 10% threshold.
Demonstrated the effectiveness of the combined QA approach.

Conclusions:

A combination of ion chamber phantoms, partial arcs, and the MapCHECK system provides a robust method for patient-specific quality assurance in RapidArc radiotherapy.
This procedure enhances the safety and accuracy of VMAT delivery.