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Related Concept Videos

Framing Effects03:26

Framing Effects

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Information is everywhere and its presentation—such as how and when items are presented—can impact our perceptions and decisions surrounding the info. This broad concept umbrellas framing effects—influences that occur due to the way information is framed in its appearance, whether it’s purely the order or the specific wording of a message. Let’s take a look at numerous ways in which two versions of something can objectively say the same thing, yet we respond in...
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Frames01:30

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Frames are essential components of various mechanical and structural systems used daily. These structures are known for their stability and ability to bear heavy loads. A frame is constructed using two-force and multi-force members, interconnected using pin joints. In contrast, trusses are made entirely of two-force members.
Frames are versatile and widely used in various applications such as structural supports for beams and columns, automobile chassis construction, and in the construction...
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Frames: Problem Solving I01:24

Frames: Problem Solving I

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Consider a jib crane with an external load suspended from the pulley. The dimensions of the crane members are shown in the figure. A systematic analysis of the frame structure is required to determine the reaction forces at the pin joints, assuming that the pulleys are frictionless.
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Frames: Problem Solving II01:26

Frames: Problem Solving II

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Consider a hydraulic hoist supporting a load of 1 kN. Assuming a simplified schematic representation of this frame structure, the force acting on BD and BF members can be determined.
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Inertial Frames of Reference01:03

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Newton’s first law is usually considered to be a statement about reference frames. It provides a method for identifying a special type of reference frame: the inertial reference frame. In principle, we can make the net force on a body zero. If its velocity relative to a given frame is constant, then that frame is said to be inertial. So, by definition, an inertial reference frame is a reference frame where Newton's first law holds valid. Newton's first law applies to objects with...
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Non-inertial Frames of Reference01:27

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A reference frame accelerating or decelerating relative to an inertial frame is a non-inertial frame. To help understand this, consider what taking off in an airplane, turning a corner in a car, riding a merry-go-round, and the circular motion of a tropical cyclone all have in common. All these systems are accelerating, decelerating, or rotating relative to the Earth; hence, they all are non-inertial frames. All these systems exhibit inertial forces, which merely seem to arise from motion,...
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Updated: Jan 23, 2026

Fluorescence Angiography for Evaluation of Aneurysm Perfusion and Parent Artery Patency in Rat and Rabbit Aneurysm Models
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Flow-Pattern Details in an Aneurysm Model Using High-Speed 1000-Frames-per-Second Angiography.

J M Krebs1, A Shankar1, S V Setlur Nagesh1,2

  • 1From the Canon (formerly Toshiba) Stroke and Vascular Research Center (J.M.K., A.K., S.V.S.N., K.V.S., E.I.L., L.N.H., D.R.B., A.H.S., S.R.).

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Summary
This summary is machine-generated.

High-speed imaging using photon-counting x-ray detectors offers superior visualization of blood flow dynamics in brain aneurysms compared to traditional methods. This advanced technique aids in understanding and treating complex vascular conditions.

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Area of Science:

  • Medical Imaging
  • Biomedical Engineering
  • Vascular Interventions

Background:

  • Digital subtraction angiography has limitations in assessing contrast flow dynamics for intracranial aneurysms.
  • Understanding flow patterns is crucial for effective endovascular treatment of brain aneurysms.

Purpose of the Study:

  • To evaluate the utility of high-speed photon-counting x-ray detection for detailed imaging of intracranial aneurysm hemodynamics.
  • To compare flow dynamics in an aneurysm model with and without a flow diverter using advanced imaging.

Main Methods:

  • Utilized a 1000-frames-per-second photon-counting x-ray detector system.
  • Imaged iodine-contrast flow patterns within a 3D-printed internal carotid artery aneurysm model.
  • Assessed flow characteristics with and without a Pipeline Embolization Device.

Main Results:

  • High-speed imaging provided unprecedented detail on vortex and inflow patterns.
  • Differences in flow dynamics were clearly visualized with and without the flow diverter.
  • Photon-counting detector imaging surpassed standard pulsed angiography in clarity and detail.

Conclusions:

  • High-speed photon-counting x-ray imaging significantly enhances the evaluation of intracranial aneurysm hemodynamics.
  • This technology offers potential for real-time insights into flow dynamics during endovascular interventions.
  • Improved understanding of flow dynamics can positively impact treatment outcomes for brain aneurysms.