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Related Concept Videos

Obesity01:24

Obesity

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The Body Mass Index (BMI) is a numerical value derived from a person's weight and height, used to categorize individuals into weight ranges. It is calculated using the formula: weight in kilograms divided by height in meters squared. Obesity is a health condition characterized by excessive accumulation of adipose tissue that poses health risks, often diagnosed with a BMI ≥ 30. This excess fat storage occurs when surplus dietary calories are converted into triglycerides and stored in...
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Equation of Motion: General Plane motion01:22

Equation of Motion: General Plane motion

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In the context of a rigid body's movement within a general plane, it is important to understand that this motion is typically triggered by external forces or couple moments exerted onto it. This principle can be explained through Newton's second law, which stipulates the translational motion of the body's center of mass along each axis.
Moreover, the body's center of mass experiences a rotational effect as a result of these couple moments. This rotation can be articulated as the...
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Drug Dosing: Obese Patients01:21

Drug Dosing: Obese Patients

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In the United States, obesity is a prominent concern. It is linked to heightened mortality rates due to increased occurrences of conditions such as hypertension, atherosclerosis, coronary artery disease, and diabetes compared to nonobese individuals. A patient is classified as obese if their actual body weight surpasses the ideal or desirable body weight by 20%, based on Metropolitan Life Insurance Company data. Ideal body weights consider average weights and heights for males and females...
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Absolute Motion Analysis- General Plane Motion01:24

Absolute Motion Analysis- General Plane Motion

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Visualize a drone, with its propellers spinning rapidly, hovering mid-air. The fascinating movements and operations of this drone can be comprehended by applying the principle of general plane motion.
As the drone's propellers rotate, an upward force is generated that counteracts the force of gravity, enabling the drone to lift off from the ground. This initial movement of the drone is along a straight path, representing a form of translational motion. In this phase, every point on the...
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Equation of Motion: General Plane motion - Problem Solving01:16

Equation of Motion: General Plane motion - Problem Solving

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Consider a lawn roller with a mass of 100 kg, a radius of 0.2 meters, and a radius of gyration of 0.15 meters. A force of 200 N is applied to this roller, angled at 60 degrees from the horizontal plane. What will be the angular acceleration of the lawn roller?
The friction between the roller and the ground is characterized by two coefficients. The static friction coefficient is 0.15, while the kinetic friction coefficient is 0.1. These values are crucial in understanding the interaction between...
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Projectile Motion: Example01:18

Projectile Motion: Example

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The theory of projectile motion is very useful for players of several sports to improve their performance. For example, a javelin thrower needs to throw their javelin in such a way that it travels as far as possible. The javelin thrower takes a short run-up to increase the initial speed of the javelin. The range of a projectile is at its maximum at a 45° angle so javelin throwers try to angle their throw as close to 45° as possible.
When we speak of the range (R) of a projectile on...
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Related Experiment Video

Updated: Feb 15, 2026

Use of MRI-ultrasound Fusion to Achieve Targeted Prostate Biopsy
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Obesity does not influence prostate intrafractional motion.

Amy Brown1, Alex Tan1,2, Scott Cooper1

  • 1Townsville Cancer Centre, The Townsville Hospital, Townsville, Queensland, Australia.

Journal of Medical Radiation Sciences
|January 24, 2018
PubMed
Summary
This summary is machine-generated.

Patient body mass index (BMI) does not reliably predict prostate motion during external beam radiation therapy (EBRT). This study found no significant correlation between BMI and intrafractional prostate movement, except for minor left-right shifts.

Keywords:
Interfraction motionintrafraction motionobesityprostate cancerradiotherapy

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Area of Science:

  • Radiation Oncology
  • Medical Physics
  • Urology

Background:

  • Prostate motion during external beam radiation therapy (EBRT) for prostate cancer presents challenges for accurate treatment delivery.
  • Body Mass Index (BMI) is a readily available indicator of obesity that may influence prostate motion.

Purpose of the Study:

  • To investigate the association between patient BMI and prostate motion during EBRT.
  • To determine if BMI can predict the extent of prostate movement for improved treatment accuracy.

Main Methods:

  • Assessed prostate motion in 130 prostate cancer patients using implanted fiducial markers.
  • Measured interfractional motion via daily cone-beam-computed tomography (CBCT) and intrafractional motion using electronic portal imaging device (EPID) during treatment.

Main Results:

  • No statistically significant relationship was found between mean intrafractional motion and BMI across the study population.
  • A statistically significant association was observed for left-right (LR) translation (P = 0.049) and within specific BMI categories (P = 0.003 for LR).

Conclusions:

  • Prostate motion during EBRT, specifically intrafractional movement, is a critical factor to consider.
  • Patient BMI cannot be reliably used to predict the degree of prostate motion for treatment planning or delivery.