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相关概念视频

Magnetic Resonance Imaging01:24

Magnetic Resonance Imaging

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Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...
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Radiological Investigation II: MRI and Ventilation Perfusion Scan01:30

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Description
Magnetic Resonance Imaging (MRI) and Ventilation Perfusion Scans are two radiological investigations that offer detailed diagnostic images of the body, particularly lung structures.
MRI
MRI uses magnetic fields and radiofrequency signals to distinguish between normal and abnormal tissues. This technology provides a more detailed diagnostic image than CT scans, enabling it to characterize pulmonary nodules, stage bronchogenic carcinoma, and evaluate inflammatory activity in...
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Computed Tomography01:10

Computed Tomography

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Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body.
The technique was invented in the 1970s and is based on the principle that as X-rays pass through the body, they are absorbed or reflected at different levels. In the technique, a patient lies on a motorized platform while a computerized axial tomography (CAT) scanner rotates...
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Imaging Studies III: Computed Tomography01:27

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DefinitionComputed Tomography (CT) of the genitourinary (GU) tract is a non-invasive imaging modality that utilizes X-rays and computer processing to generate detailed cross-sectional images of the urinary system, encompassing the kidneys, ureters, bladder, and adjacent structures such as the adrenal glands.PurposeCT scans of the GU tract serve several diagnostic and therapeutic purposes, including:Diagnosis of Urinary Tract Diseases: Detects kidney stones, tumors, cysts, and congenital...
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Imaging Studies I: CT and MRI01:14

Imaging Studies I: CT and MRI

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Introduction: MRI and CT scans are crucial advancements in medical imaging techniques, playing a vital role in diagnosing conditions related to the gastrointestinal (GI) system. Each scan serves distinct purposes, targets specific areas, and requires unique nursing duties.
Description of the Procedures
Computed Tomography (CT) scan:
Computed Tomography (CT) scans use X-ray technology to generate detailed images of bones, organs, and tissues. During the scan, the patient lies on a moving table...
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Cardiovascular magnetic resonance imaging, or CMRI, is a non-invasive diagnostic test that employs a magnetic field and radiofrequency waves to create precise images of the heart and arteries. It provides comprehensive information about cardiac anatomy, function, perfusion, and tissue characterization without ionizing radiation.IndicationsCMRI diagnoses various heart conditions, including tissue damage from heart attacks, ischemic heart disease, myocarditis, aortic issues (tears, aneurysms,...
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机载MRI图像压缩使用视频编码器用于MR引导放射治疗.

Jiawen Shang1, Peng Huang1, Ke Zhang1

  • 1Department of Radiation Oncology, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China.

Quantitative imaging in medicine and surgery
|August 15, 2023
PubMed
概括

高效视频编码 (HEVC或H.265) 有效地压缩了放射治疗中的磁共振成像 (MRI) 数据,显著减少了存储需求,同时保持了图像质量. 这种方法为管理图像引导治疗中的大型MRI数据集提供了可行的解决方案.

关键词:
磁共振成像 (MRI) 是一种磁共振成像技术.自动分区的自动分区.数据压缩数据压缩.磁共振导向放射疗法 (MR导向放射疗法)视频编码器视频编码器

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科学领域:

  • 医疗成像医学成像
  • 放射治疗技术 放射治疗技术
  • 数据压缩数据压缩

背景情况:

  • 磁共振成像 (MRI) 对于图像导向放射治疗至关重要,它可以在线监测目标并调整计划.
  • 在MRI导向放射治疗过程中产生的大量数据带来了重大的存储挑战.

研究的目的:

  • 调查使用视频编码器压缩MR导向放射治疗的MRI图像的可行性.
  • 评估各种视频压缩技术的有效性,以管理大型MRI数据集.

主要方法:

  • 两种分类算法 (切片优先和位置优先) 用于重新排序MRI切片.
  • 三种作物算法 (形态,洪水填充,水平设置) 用于兴趣区域细分.
  • 评估了四种视频编码器:运动-JPEG (M-JPEG),MPEG-4 (MP4),高级视频编码 (AVC或H.264) 和高效视频编码 (HEVC或H.265).

主要成果:

  • HEVC (H.265) 实现了最高的压缩比 (比M-JPEG提高了高达72%) 和卓越的恢复精度.
  • 框架间编码视频编码器 (MP4,H.264,H.265) 的性能优于框架内编码 (M-JPEG).
  • 切片优先排序和特定的裁剪算法进一步增强了压缩比,特别是在H.265.5.

结论:

  • 视频编码器,特别是那些使用像H.265这样的跨编码的视频编码器,可用于MRI指导放射治疗中的高性能MRI数据存储.
  • 压缩技术可以有效地解决与放射治疗中的MRI相关的数据存储问题.
  • 优化的排序和裁剪方法提高了MRI数据集的压缩效率.