[对不同供应商的定期旋转重叠平行EL线与增强重建 (PROPELLER) 成像的最新运动校正技术的评估]
Yuma Takahashi1, Hironobu Ishikawa1,2, Hitoshi Nemoto3
1Department of Radiology, Fukushima Medical University Hospital.
Nihon Hoshasen Gijutsu Gakkai zasshi
|October 20, 2024
概括
不同的供应商不同.
科学领域:
- 医学成像医学成像
- 放射学 放射学是一门学科.
- 磁共振成像 (MRI) 是一种磁共振成像技术.
背景情况:
- 在MRI扫描期间的头部运动会降低图像质量.
- 定期旋转的重叠平行线与增强重建 (PROPELLER) 是一种减轻运动工件的技术.
研究的目的:
- 评估四家主要供应商的PROPELLER技术对头部运动的稳定性.
- 了解供应商特定的特征,以获得最佳的临床应用.
主要方法:
- 一个大脑幻影被用来模拟T2加权图像.
- 图像是使用来自佳能,通用电气,飞利浦和西门子的MRI扫描仪获得的.
- 结构相似性 (SSIM) 用于评估各种头部运动模式 (旋转角度和频率) 下的图像质量.
主要成果:
- 佳能显示出对小旋转的稳定性;GE显示出一致的稳定性,通过深度学习重建 (DLR) 增强.
- 飞利浦的强度因压缩灵敏度编码 (CS) 和刀片宽度而异;西门子对大动作有强度.
- 所有供应商在旋转频率依赖方面表现相似.
结论:
- 对PROPELLER技术在各供应商之间与头部运动进行了定量评估.
- 了解特定供应商的PROPELLER特征可以在移动患者中进行诊断质量的成像.
相关概念视频
Absolute Motion Analysis- General Plane Motion
217
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...
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...
217
Relative Motion Analysis using Rotating Axes-Problem Solving
389
Consider a crane whose telescopic boom rotates with an angular velocity of 0.04 rad/s and angular acceleration of 0.02 rad/s2. Along with the rotation, the boom also extends linearly with a uniform speed of 5 m/s. The extension of the boom is measured at point D, which is measured with respect to the fixed point C on the other end of the boom. For the given instant, the distance between points C and D is 60 meters.
Here, in order to determine the magnitude of velocity and acceleration for point...
Here, in order to determine the magnitude of velocity and acceleration for point...
389
Relative Motion Analysis - Velocity
342
A stroke engine has a slider-crank mechanism that converts rotational motion from the crank into linear motion of the slider or vice versa. This mechanism consists of three main parts: the crank, the connecting rod, and the slider.
When an external force is exerted, it sets the crank into a rotational movement. This, in turn, instigates the motion of the connecting rod, leading to what is referred to as a general plane motion. This process involves two key points - point A on the connecting rod...
When an external force is exerted, it sets the crank into a rotational movement. This, in turn, instigates the motion of the connecting rod, leading to what is referred to as a general plane motion. This process involves two key points - point A on the connecting rod...
342
Relative Motion Analysis using Rotating Axes
448
Consider a component AB undergoing a linear motion. Along with a linear motion, point B also rotates around point A. To comprehend this complex movement, position vectors for both points A and B are established using a stationary reference frame.
However, to express the relative position of point B relative to point A, an additional frame of reference, denoted as x'y', is necessary. This additional frame not only translates but also rotates relative to the fixed frame, making it...
However, to express the relative position of point B relative to point A, an additional frame of reference, denoted as x'y', is necessary. This additional frame not only translates but also rotates relative to the fixed frame, making it...
448
Relative Motion Analysis - Acceleration
336
A slider-crank mechanism converts rotational motion from the crank into linear motion of the slider or vice versa. This mechanism consists of three main parts: the crank, the connecting rod, and the slider. The movement of the slider-crank is an example of general plane motion as the fluctuating angle between the crank and the connecting rod. Consider a segment AB where point A is at the end of the slider and point B is on the diametrically opposite end to point A, on a crack. The variance in...
336


