{
  "id": 359139,
  "title": "Number of vertebrae in same slice",
  "url": "/competitions/rsna-2022-cervical-spine-fracture-detection/discussion/359139",
  "author_name": "IgorMuniz",
  "post_date": "2022-10-10T22:22:53.818000",
  "votes": 4,
  "comment_count": 2,
  "views": 0,
  "content": "<p>Is it possible to have 3 different (e.g.  c5,c6 and c7) vertebrae in a same slice? <br>\nBased on segmentation's label, it's quite common to get two vertebrae per slice and sometimes three.<br>\nThat seems odd to me, however I don't have proper knowledge to affirm this is a labeling issue. <br>\nCould someone elaborate more on this, please?</p>\n<p>Thanks</p>",
  "messages": [
    {
      "id": 1982644,
      "postDate": "2022-10-11T14:35:11.320Z",
      "content": "<p>Yes, most of the c-spine vertebrae overlap in the axial plane simply because of the shape of the vertebrae. The spinous process (in the back) is angled downward compared to the relative angle of each vertebral body. Also, a normal cervical spine has a <em>lordotic</em> curvature to it, so the vertebrae are not parallel to each other to begin with, rather they're aligned to a curve. Odd positioning of the patient inside the gantry during scan time can put multiple vertebrae in a single slice as well.</p>",
      "rawMarkdown": "Yes, most of the c-spine vertebrae overlap in the axial plane simply because of the shape of the vertebrae. The spinous process (in the back) is angled downward compared to the relative angle of each vertebral body. Also, a normal cervical spine has a *lordotic* curvature to it, so the vertebrae are not parallel to each other to begin with, rather they're aligned to a curve. Odd positioning of the patient inside the gantry during scan time can put multiple vertebrae in a single slice as well.",
      "votes": 4,
      "replies": [
        {
          "id": 1982671,
          "postDate": "2022-10-11T14:47:29.773Z",
          "content": "<p>Good to know. Thank you!</p>",
          "rawMarkdown": "Good to know. Thank you!"
        }
      ]
    },
    {
      "id": 1981587,
      "postDate": "2022-10-10T22:22:53.817Z",
      "content": "<p>Is it possible to have 3 different (e.g.  c5,c6 and c7) vertebrae in a same slice? <br>\nBased on segmentation's label, it's quite common to get two vertebrae per slice and sometimes three.<br>\nThat seems odd to me, however I don't have proper knowledge to affirm this is a labeling issue. <br>\nCould someone elaborate more on this, please?</p>\n<p>Thanks</p>",
      "rawMarkdown": "Is it possible to have 3 different (e.g.  c5,c6 and c7) vertebrae in a same slice? \nBased on segmentation's label, it's quite common to get two vertebrae per slice and sometimes three.\nThat seems odd to me, however I don't have proper knowledge to affirm this is a labeling issue. \nCould someone elaborate more on this, please?\n\nThanks",
      "votes": 4
    }
  ],
  "comments": [
    {
      "id": 1982644,
      "author_name": "David Roberts",
      "author_url": "",
      "post_date": "2022-10-11T14:35:11.320000",
      "content": "<p>Yes, most of the c-spine vertebrae overlap in the axial plane simply because of the shape of the vertebrae. The spinous process (in the back) is angled downward compared to the relative angle of each vertebral body. Also, a normal cervical spine has a <em>lordotic</em> curvature to it, so the vertebrae are not parallel to each other to begin with, rather they're aligned to a curve. Odd positioning of the patient inside the gantry during scan time can put multiple vertebrae in a single slice as well.</p>",
      "votes": 4,
      "replies": [
        {
          "id": 1982671,
          "author_name": "IgorMuniz",
          "author_url": "",
          "post_date": "2022-10-11T14:47:29.773000",
          "content": "<p>Good to know. Thank you!</p>",
          "votes": 0,
          "replies": []
        }
      ]
    }
  ],
  "raw_markdown_by_id": {
    "1982644": "Yes, most of the c-spine vertebrae overlap in the axial plane simply because of the shape of the vertebrae. The spinous process (in the back) is angled downward compared to the relative angle of each vertebral body. Also, a normal cervical spine has a *lordotic* curvature to it, so the vertebrae are not parallel to each other to begin with, rather they're aligned to a curve. Odd positioning of the patient inside the gantry during scan time can put multiple vertebrae in a single slice as well.",
    "1981587": "Is it possible to have 3 different (e.g.  c5,c6 and c7) vertebrae in a same slice? \nBased on segmentation's label, it's quite common to get two vertebrae per slice and sometimes three.\nThat seems odd to me, however I don't have proper knowledge to affirm this is a labeling issue. \nCould someone elaborate more on this, please?\n\nThanks"
  }
}