{
  "id": 431429,
  "title": "Hounsfield Unit",
  "url": "/competitions/rsna-2023-abdominal-trauma-detection/discussion/431429",
  "author_name": "Ammar Ahmad Qazi",
  "post_date": "2023-08-13T16:00:03.300000",
  "votes": 1,
  "comment_count": 0,
  "views": 0,
  "content": "<p>Houston Unit (HU) is a dimensionless unit given by the formula:</p>\n<blockquote>\n  <p>$$ HU = \\left( \\frac{\\mu_{material} - \\mu_{water}}{\\mu_{water}} \\right) \\times 100 $$</p>\n</blockquote>\n<p>where :</p>\n<blockquote>\n  <p>$\\mu_{material}$ is linear attenuation coefficient of the material</p>\n  <p>$\\mu_{water}$  is linear attenuation coefficient of water</p>\n</blockquote>\n<p>Linear attenuation coefficient is a measure of how much the incident energy beam (e.g. ultrasound or x-rays) is weakened by the material per unit thickness of the material.</p>\n<p>Weakening of the incident energy beam is determined by the fraction of attenuated (or weakened) incident photons.</p>\n<p>So, Houston Unit is percentage change in fraction of attenuated photons while passing through the material relative to water for the same thickness.</p>",
  "messages": [
    {
      "id": 2388765,
      "postDate": "2023-08-13T16:00:03.300Z",
      "content": "<p>Houston Unit (HU) is a dimensionless unit given by the formula:</p>\n<blockquote>\n  <p>$$ HU = \\left( \\frac{\\mu_{material} - \\mu_{water}}{\\mu_{water}} \\right) \\times 100 $$</p>\n</blockquote>\n<p>where :</p>\n<blockquote>\n  <p>$\\mu_{material}$ is linear attenuation coefficient of the material</p>\n  <p>$\\mu_{water}$  is linear attenuation coefficient of water</p>\n</blockquote>\n<p>Linear attenuation coefficient is a measure of how much the incident energy beam (e.g. ultrasound or x-rays) is weakened by the material per unit thickness of the material.</p>\n<p>Weakening of the incident energy beam is determined by the fraction of attenuated (or weakened) incident photons.</p>\n<p>So, Houston Unit is percentage change in fraction of attenuated photons while passing through the material relative to water for the same thickness.</p>",
      "rawMarkdown": "Houston Unit (HU) is a dimensionless unit given by the formula:\n\n> $$ HU = \\left( \\frac{\\mu_{material} - \\mu_{water}}{\\mu_{water}} \\right) \\times 100 $$\n\nwhere :\n\n> $\\mu_{material}$ is linear attenuation coefficient of the material\n\n> $\\mu_{water}$  is linear attenuation coefficient of water\n\nLinear attenuation coefficient is a measure of how much the incident energy beam (e.g. ultrasound or x-rays) is weakened by the material per unit thickness of the material.\n\nWeakening of the incident energy beam is determined by the fraction of attenuated (or weakened) incident photons.\n\nSo, Houston Unit is percentage change in fraction of attenuated photons while passing through the material relative to water for the same thickness.\n\n",
      "votes": 1
    }
  ],
  "comments": [],
  "raw_markdown_by_id": {
    "2388765": "Houston Unit (HU) is a dimensionless unit given by the formula:\n\n> $$ HU = \\left( \\frac{\\mu_{material} - \\mu_{water}}{\\mu_{water}} \\right) \\times 100 $$\n\nwhere :\n\n> $\\mu_{material}$ is linear attenuation coefficient of the material\n\n> $\\mu_{water}$  is linear attenuation coefficient of water\n\nLinear attenuation coefficient is a measure of how much the incident energy beam (e.g. ultrasound or x-rays) is weakened by the material per unit thickness of the material.\n\nWeakening of the incident energy beam is determined by the fraction of attenuated (or weakened) incident photons.\n\nSo, Houston Unit is percentage change in fraction of attenuated photons while passing through the material relative to water for the same thickness.\n\n"
  }
}