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Related Concept Videos

Pulse rhythm01:30

Pulse rhythm

Pulse rhythm refers to the pattern of pulsations within specific intervals, offering valuable insights into the regularity or irregularity of the heart's beats as observed through the pattern of pulsation within specific intervals. A regular pulse exhibits a consistent heart rate with uniform waveforms and pulsation force, variations of which can be classified as normal, weak, or bounding.
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Pulse assessment sites are crucial in evaluating a patient's cardiovascular health. By assessing the pulsations of arteries at specific anatomical locations, healthcare professionals can gather valuable information about blood flow, heart rate, and peripheral circulation. Understanding these pulse assessment sites is essential for conducting comprehensive cardiovascular evaluations and monitoring patients' overall health. These sites are strategically chosen due to the accessibility and...

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Updated: Jun 14, 2026

Use of a Linear Accelerator for Conducting In Vitro Radiobiology Experiments
06:08

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Published on: May 26, 2019

Monitoring linear accelerator output constancy using the PTW Linacheck.

Garry M McDermott1, Andrew H Buckle

  • 1Radiotherapy Physics Section, Department of Medical Physics and Clinical Engineering, Churchill Hospital, Oxford Radcliffe NHS Hospitals Trust, Headington, Oxford, UK. garry.mcdermott@orh.nhs.uk

Medical Dosimetry : Official Journal of the American Association of Medical Dosimetrists
|March 30, 2010
PubMed
Summary
This summary is machine-generated.

The PTW-Linacheck device effectively monitors linear accelerator (LINAC) output constancy. Regular monthly recalibration is crucial for ensuring acceptable long-term reproducibility of radiation therapy equipment.

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Published on: May 9, 2014

Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Quality Assurance in Radiotherapy

Background:

  • Maintaining linear accelerator (LINAC) radiation output constancy is critical for accurate and safe radiation therapy.
  • The PTW-Linacheck is a device used for daily quality assurance (QA) of LINAC output.
  • Optimizing measurement setups is essential for reliable QA data.

Purpose of the Study:

  • To evaluate the PTW-Linacheck's efficacy in monitoring LINAC radiation output constancy.
  • To determine optimal measurement setups for daily output verification using the PTW-Linacheck.
  • To assess the device's linearity and reproducibility across various beam energies.

Main Methods:

  • Investigated setup parameters including build-up and backscatter materials for daily output measurements.
  • Defined specific build-up requirements for 4 MeV electron beams, 6-16 MeV electron beams, and 6-15 MV photon beams.
  • Assessed the dose linearity and short-term reproducibility of the PTW-Linacheck with LINAC output.

Main Results:

  • An appropriate measurement setup was identified: 10 × 10 cm field at 100 cm FSD, 5 cm backscatter, with specific build-up requirements per beam type.
  • The PTW-Linacheck demonstrated acceptable dose linearity and short-term reproducibility with the established setup.
  • Long-term reproducibility was found to be acceptable only with monthly recalibration.

Conclusions:

  • The PTW-Linacheck, with an optimized setup, is suitable for monitoring LINAC output constancy.
  • Monthly recalibration of the PTW-Linacheck is necessary to ensure reliable long-term performance.
  • Adherence to specific build-up and backscatter guidelines is vital for accurate QA measurements.