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Related Concept Videos

Drawing Free-body Diagrams: Rules01:16

Drawing Free-body Diagrams: Rules

The first step in describing and analyzing most phenomena in physics involves the careful drawing of a free-body diagram. Free-body diagrams are useful in analyzing forces acting on an object or system, and are employed extensively in the study and application of Newton's laws of motion. The steps to draw a free-body diagram are listed below:
Kinematic Equations: Problem Solving01:15

Kinematic Equations: Problem Solving

When analyzing one-dimensional motion with constant acceleration, the problem-solving strategy involves identifying the known quantities and choosing the appropriate kinematic equations to solve for the unknowns. Either one or two kinematic equations are needed to solve for the unknowns, depending on the known and unknown quantities. Generally, the number of equations required is the same as the number of unknown quantities in the given example. Two-body pursuit problems always require two...
First Law: Particles in Two-dimensional Equilibrium01:18

First Law: Particles in Two-dimensional Equilibrium

Recall that a particle in equilibrium is one for which the external forces are balanced. Static equilibrium involves objects at rest, and dynamic equilibrium involves objects in motion without acceleration; but it is important to remember that these conditions are relative. For instance, an object may be at rest when viewed from one frame of reference, but that same object would appear to be in motion when viewed by someone moving at a constant velocity.
Newton's first law tells us about the...
Steps for Free-Body Diagram01:22

Steps for Free-Body Diagram

When it comes to studying the behavior of objects in mechanics, one of the most important tools available is the free-body diagram. Consider a simple example of a system of two blocks coupled by a massless string over a frictionless pulley. Block 1 is sliding over a table pulled by block 2 as block 2 falls under gravity.
To find the acceleration of the system, it is first necessary to calculate the net force on the system. In order to accomplish this, a free-body diagram can be created to...
Free-body Diagram01:28

Free-body Diagram

In mechanics, understanding the motion of objects is essential, and one tool that helps solve this problem is the free-body diagram. It is a simple but powerful graphical representation that succinctly represents all the forces acting on an object. A free-body diagram can represent a stationary or moving object, and is used in mechanics to explain the cause of an object's motion.
A free-body diagram transforms a complex problem into a simple representation, making it easy to understand the...
Two-Dimensional Force System: Problem Solving01:29

Two-Dimensional Force System: Problem Solving

Solving problems related to two-dimensional force systems is an essential aspect of mechanics and engineering. By applying the principles of vector analysis and force equilibrium, one can determine the effect of multiple forces acting on an object in a two-dimensional space.
The first step to solving a two-dimensional force system problem is to draw a free-body diagram of the object under consideration. This diagram helps identify all the external forces acting on the object, including their...

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Optical Coherence Tomography Based Biomechanical Fluid-Structure Interaction Analysis of Coronary Atherosclerosis Progression
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Automating the initial physics chart checking process.

Eli E Furhang1, James Dolan1, Jussi K Sillanpaa1

  • 1Department of Radiation Oncology, Beth Israel Medical Center, 10 Union Square East, New York, NY, U.S.A.

Journal of Applied Clinical Medical Physics
|February 19, 2009
PubMed
Summary
This summary is machine-generated.

Automating the initial physics chart check significantly reduces review time. This quality assurance process now takes minutes instead of an hour, improving efficiency in radiation therapy planning.

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Area of Science:

  • Medical Physics
  • Radiation Oncology Quality Assurance

Background:

  • The initial physics chart check is a critical quality assurance step in radiation therapy.
  • Ensuring physician intent, plan reasonableness, and accurate Record and Verify (RV) system parameter capture is essential.

Purpose of the Study:

  • To automate the initial physics chart check process.
  • To improve the efficiency and consistency of quality assurance in radiation therapy treatment planning.

Main Methods:

  • Characterized the initial physics chart check into intra-plan and inter-plan reviews.
  • Developed software to automate parameter verification and outlier detection using Statistical Process Control (SPC).
  • Implemented a summary sheet for automatic deviation documentation.

Main Results:

  • Automated process reduced chart check time from approximately one hour to a few minutes.
  • Analyzed 45 patient charts using the developed software.
  • Facilitated experience summation and inter-staff comparison through parameter tabulation.

Conclusions:

  • Automation of the initial physics chart check streamlines quality assurance.
  • The developed software enhances efficiency and allows staff to focus on overall treatment plan integrity.
  • This approach improves the tracking of treatment plan parameters and deviations.