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Related Concept Videos

Breathing01:05

Breathing

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The process of breathing, inhaling and exhaling, involves the coordinated movement of the chest wall, the lungs, and the muscles that move them. Two muscle groups with important roles in breathing are the diaphragm, located directly below the lungs, and the intercostal muscles, which lie between the ribs. When the diaphragm contracts, it moves downward, increasing the volume of the thoracic cavity and creating more room for the lungs to expand. When the intercostal muscles contract, the ribs...
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Mechanism of Breathing I: Inspiration01:30

Mechanism of Breathing I: Inspiration

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Introduction to Inspiration: The Respiratory System in Action
The respiratory system, an essential network for breathing, comprises the conducting and respiratory zones, each playing a crucial role in the overall process of respiration. Let us explore the detailed mechanism of inspiration, or inhalation, which is the first phase of the respiratory cycle.
Pathway of Air during Inspiration
During inspiration, air enters our body through the nose or mouth and moves through the conducting zone,...
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Assessment of Ventilation I: Respiratory Rate01:20

Assessment of Ventilation I: Respiratory Rate

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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:
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Respiratory Volumes01:15

Respiratory Volumes

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Respiratory volumes are crucial metrics, meticulously measured to quantify the air exchanged in and out of the lungs during various phases of the breathing cycle. These precise measurements are vital for assessing lung function, diagnosing respiratory conditions, and monitoring overall respiratory health. Each parameter provides specific insights into the mechanics of breathing and the functional capacity of the lungs.
Tidal Volume (TV) Tidal volume (TV) is the air inhaled or exhaled in a...
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Mechanism of Breathing II: Expiration01:23

Mechanism of Breathing II: Expiration

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The Physiology of Expiration: A Seamless Respiratory Process
Expiration, or exhaling, is a complex physiological process that begins as the inspiratory muscles begin to relax. This relaxation triggers a series of events that epitomize the efficiency of the respiratory system.
Mechanism of Expiration:
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Neural Control of Respiration01:18

Neural Control of Respiration

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The neural regulation of respiration is a meticulously coordinated process primarily controlled by the respiratory centers located within the brainstem. These centers, composed of specialized neurons, transmit nerve impulses that control the contraction and relaxation of our respiratory muscles.
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Voluntary Breath-hold Technique for Reducing Heart Dose in Left Breast Radiotherapy
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Novel breathing motion model for radiotherapy.

Daniel A Low1, Parag J Parikh, Wei Lu

  • 1Department of Radiation Oncology, Washington University School of Medicine, St. Louis, MO 63110, USA. low@wustl.edu

International Journal of Radiation Oncology, Biology, Physics
|September 6, 2005
PubMed
Summary
This summary is machine-generated.

A new mathematical model accurately predicts lung and tumor motion during breathing using tidal volume and airflow. This patient-specific model shows potential for precise lung cancer treatment planning and gating.

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Area of Science:

  • Medical Physics
  • Radiotherapy
  • Computational Biology

Background:

  • Accurate modeling of lung and tumor motion during quiet respiration is crucial for conformal radiotherapy of mobile lung lesions.
  • Lung motion is influenced by physiological factors like tidal volume and airflow.

Purpose of the Study:

  • To develop and validate a mathematical model for lung and lung tumor motion based on physiological breathing parameters.
  • To assess the potential of this model for patient-specific radiotherapy planning.

Main Methods:

  • A mathematical model was created describing lung object motion as a function of tidal volume and airflow, incorporating hysteresis.
  • The model was tested using 4D CT scans of 4 patients, tracking 76 points with a template-matching algorithm.
  • Motion was analyzed in two spatial dimensions, requiring six parameters to describe 30 degrees of freedom.

Main Results:

  • The model demonstrated an average positional discrepancy of 0.75 +/- 0.25 mm between predicted and measured positions.
  • Discrepancies were <10% of overall motion in 73% of tracked points and <15% in 95% of points.
  • This indicates high accuracy in predicting lung tissue movement.

Conclusions:

  • The developed model, utilizing tidal volume phase space, offers the potential for patient-specific mathematical modeling of breathing motion.
  • Further automation of motion tracking will refine model parameters for potential use in treatment planning and gating.
  • The model's robustness over time will determine its utility for long-term radiotherapy applications.