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Related Concept Videos

Positron Emission Tomography01:29

Positron Emission Tomography

Positron emission tomography (PET) is a medical imaging technique involving radiopharmaceuticals — substances that emit short-lived radiation. Although the first PET scanner was introduced in 1961, it took 15 more years before radiopharmaceuticals were combined with the technique and revolutionized its potential.
One of the main requirements of a PET scan is a positron-emitting radioisotope, which is produced in a cyclotron and then attached to a substance used by the part of the body being...
Imaging Studies II: Positron Emission Tomography and Scintigraphy01:25

Imaging Studies II: Positron Emission Tomography and Scintigraphy

Positron Emission Tomography (PET) is a medical imaging technique that provides crucial insights into the body's physiological functions at a molecular level. It is an indispensable resource for diagnosing, staging, and monitoring various illnesses, notably cancer, neurological disorders, and cardiovascular conditions.
Fundamental Principles of PET

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Related Experiment Video

Updated: May 29, 2026

Dynamic Lung Tumor Tracking for Stereotactic Ablative Body Radiation Therapy
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The Itappachi Universal Motion Platform for Accurate Dose Measurement in Thoracoabdominal Radiotherapy.

Naoki Tohyama1, Eriko Saito2, Kazuhide Uchida3

  • 1Department of Radiological Sciences, Komazawa University, Tokyo, JPN.

Cureus
|November 18, 2024
PubMed
Summary

The Itappachi platform accurately measures radiation doses during simulated respiratory motion, crucial for improving radiation therapy precision. This cost-effective solution enhances quality assurance by revealing dose degradation in dynamic, non-gated treatments.

Keywords:
dose measurementphoton beamradiation therapyrespiratory gatingvmat

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Biomedical Engineering

Background:

  • Respiratory motion during radiation therapy can cause interplay effects, reducing dose delivery accuracy in advanced techniques like volumetric modulated arc therapy.
  • Precise dose measurement in dynamic scenarios is essential for quality assurance in modern radiation oncology.
  • Existing methods may be costly or lack the capability to accurately simulate patient motion.

Purpose of the Study:

  • To develop and validate the "Itappachi" universal motion platform for precise radiation dose measurement under simulated respiratory motion.
  • To assess the impact of respiratory motion on dose delivery accuracy using the developed platform.
  • To provide a cost-effective and accurate solution for quality assurance in dynamic radiation therapy.

Main Methods:

  • Development of the "Itappachi" platform with a large surface area (580 mm × 380 mm), 56.8 kg weight capacity, ±25 mm motion amplitude, and Wi-Fi control.
  • Verification of motion accuracy with a maximum displacement error of 0.12 mm.
  • Dose measurements using a Delta4 Phantom under static, dynamic non-gated, and dynamic gated irradiation conditions.

Main Results:

  • Gamma index analysis showed excellent agreement (99.4%) for static and dynamic gated irradiation conditions.
  • Significant dose degradation (32.6%) was observed under dynamic non-gated irradiation conditions, highlighting the interplay effect.
  • The Itappachi platform demonstrated high motion accuracy and cost-effectiveness.

Conclusions:

  • The "Itappachi" universal motion platform enables accurate dose measurement under simulated respiratory motion.
  • The platform effectively quantifies dose degradation caused by the interplay effect in dynamic radiation therapy.
  • Itappachi offers a valuable tool for enhancing quality assurance and improving treatment precision in radiation oncology.