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Related Concept Videos

Assessment of Ventilation I: Respiratory Rate01:20

Assessment of Ventilation I: Respiratory Rate

Assessment of Ventilation
A Ventilation assessment is critical for monitoring a patient's health status. Respiration, one of the most accessible vital signs, provides insights into the function of numerous body systems and can indicate serious health issues, such as brainstem injuries from head trauma.
Critical Guidelines for Assessing Ventilation:
Assessment of Ventilation II: Respiratory Depth and Rhythm01:29

Assessment of Ventilation II: Respiratory Depth and Rhythm

Respiratory Depth
Respiratory depth measures the volume of air inhaled or exhaled during a breath. It can vary from shallow to deep and typically remains consistent when a person is at rest or asleep. Occasionally, individuals will automatically inhale deeply, known as sighing, which inflates the lungs with more air than normal breathing.
To assess respiratory depth, observe the degree of chest excursion or movement:
Quality Assurance01:19

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...
Respiratory System Abnormal Finding I: Inspection and Percussion01:30

Respiratory System Abnormal Finding I: Inspection and Percussion

Respiratory system abnormalities are a significant concern in healthcare due to their potential to indicate underlying severe conditions like Chronic Obstructive Pulmonary Disease (COPD), asthma, and pneumonia. These abnormalities can often be detected through physical examination methods like inspection and percussion.
Inspection Findings
During an inspection, several findings may suggest the presence of respiratory distress or disease. Pursed-lip breathing, where exhalation is slowed by...
Oxygen Delivering System II: Venturi Mask and Transtracheal Oxygen01:16

Oxygen Delivering System II: Venturi Mask and Transtracheal Oxygen

Oxygen therapy is a pivotal aspect of medical care, particularly for patients with respiratory ailments. Two prominent oxygen-delivering systems include the Venturi mask and the transtracheal oxygen catheter.
Venturi Mask
The Venturi mask, named after the Venturi effect, is designed to deliver precise oxygen concentrations. It consists of a large tube with an oxygen inlet that narrows down, causing a pressure drop that pulls air in through adjustable side ports. The mask is a lightweight,...
Administering Oxygen by Mask01:30

Administering Oxygen by Mask

Administering Oxygen by Mask
Administering oxygen by mask is a common nursing intervention that provides supplemental oxygen to patients with respiratory distress or chronic lung conditions. This procedure involves delivering oxygen at a specified rate through a face mask connected to an oxygen source.
Equipment
The equipment necessary for this procedure includes:

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Related Experiment Video

Updated: Jun 26, 2026

Management of Respiratory Motion Artefacts in 18F-fluorodeoxyglucose Positron Emission Tomography using an Amplitude-Based Optimal Respiratory Gating Algorithm
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Management of Respiratory Motion Artefacts in 18F-fluorodeoxyglucose Positron Emission Tomography using an Amplitude-Based Optimal Respiratory Gating Algorithm

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Log file-based quality assurance method for respiratory gating system.

Wonjoong Cheon1, Young Kyu Lee1, Yunji Seol2

  • 1Department of Radiation Oncology, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea.

Journal of Applied Clinical Medical Physics
|April 8, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces a log file-based quality assurance (QA) method for respiratory-gated radiation therapy. The new QA approach ensures accurate synchronization between radiation delivery and tumor motion, enhancing patient safety.

Keywords:
Log file‐based analysisRGSC (Respiratory Gating for Scanner) systemquality assurance (QA)radiation therapyrespiratory gating

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Quality Assurance

Background:

  • Advancements in medical linear accelerators enable higher dose rate deliveries, increasing the use of hypofractionation regimens.
  • Hypofractionation necessitates robust respiratory gating systems to synchronize radiation delivery with tumor motion.
  • Effective quality assurance (QA) is crucial for ensuring treatment accuracy and patient safety in gated radiation therapy.

Purpose of the Study:

  • To propose and evaluate a novel log file-based QA method for respiratory-gated radiation therapy.
  • To assess the accuracy and reproducibility of a respiratory gating system and treatment machine using log file analysis.
  • To establish an efficient and objective QA procedure for gated radiation therapy.

Main Methods:

  • Utilized a Varian motion phantom and Respiratory Gating for Scanner (RGSC) for 4D CT scans.
  • Developed a treatment plan with specific respiratory phases (25%-75%) and delivered it to a phantom.
  • Extracted and analyzed treatment logs (respiratory signals, beam flags) using in-house software for temporal synchronization assessment.
  • Performed output measurements with an ion chamber and acquired EPID images for dosimetric accuracy and beam delivery timing verification.

Main Results:

  • Log file analysis demonstrated precise temporal synchronization between respiratory phases and beam triggers (mean time difference < 0.05s).
  • Log-derived beam-on duration closely matched the planned duration, with high consistency over three months.
  • Ion chamber measurements confirmed dosimetric agreement between gating and non-gating modes, with minimal differences (0.05 cGy ± 0.09 cGy).

Conclusions:

  • The proposed log file-based QA method accurately and reproducibly assesses respiratory gating performance.
  • This approach offers an efficient and objective means to standardize QA in respiratory-gated radiation therapy.
  • Implementing this QA method enhances treatment accuracy and patient safety in modern radiation oncology practices.