{
  "id": 436799,
  "title": "Scans with weird intensity shifts",
  "url": "/competitions/rsna-2023-abdominal-trauma-detection/discussion/436799",
  "author_name": "Gunes Evitan",
  "post_date": "2023-09-04T06:50:17.142000",
  "votes": 4,
  "comment_count": 4,
  "views": 0,
  "content": "<p>When I was looking for scans with unusual pixel intensity values, I found couple scans like this. I didn't use any windowing here. Some slices are suddenly becoming too dark and slices at 0:31 are really weird. Any idea what's happening here?<br>\n<a href=\"https://streamable.com/5mwb7k\" target=\"_blank\">https://streamable.com/5mwb7k</a></p>",
  "messages": [
    {
      "id": 2422654,
      "postDate": "2023-09-04T06:50:17.143Z",
      "content": "<p>When I was looking for scans with unusual pixel intensity values, I found couple scans like this. I didn't use any windowing here. Some slices are suddenly becoming too dark and slices at 0:31 are really weird. Any idea what's happening here?<br>\n<a href=\"https://streamable.com/5mwb7k\" target=\"_blank\">https://streamable.com/5mwb7k</a></p>",
      "rawMarkdown": "When I was looking for scans with unusual pixel intensity values, I found couple scans like this. I didn't use any windowing here. Some slices are suddenly becoming too dark and slices at 0:31 are really weird. Any idea what's happening here?\nhttps://streamable.com/5mwb7k",
      "votes": 3
    },
    {
      "id": 2423217,
      "postDate": "2023-09-04T14:08:46.860Z",
      "content": "<p>That's called \"Beam Hardening Effect\". It's coming from the EKG leads in the image.</p>",
      "rawMarkdown": "That's called \"Beam Hardening Effect\". It's coming from the EKG leads in the image.",
      "votes": 1
    },
    {
      "id": 2422788,
      "postDate": "2023-09-04T08:44:02.197Z",
      "content": "<p>They've become dark because on those slices, there was an object with higher intensities than bones, for example. If you look at the upper right corner of the slice, you will see a bright dot.</p>",
      "rawMarkdown": "They've become dark because on those slices, there was an object with higher intensities than bones, for example. If you look at the upper right corner of the slice, you will see a bright dot.",
      "votes": 1,
      "replies": [
        {
          "id": 2422970,
          "postDate": "2023-09-04T11:39:17.370Z",
          "content": "<p>Yeah and I think some patients may had metal objects with them. I guess we can deal with this issue with windowing right?</p>",
          "rawMarkdown": "Yeah and I think some patients may had metal objects with them. I guess we can deal with this issue with windowing right?",
          "replies": [
            {
              "id": 2423045,
              "postDate": "2023-09-04T12:16:08.547Z",
              "content": "<p>Yes, I guess the windowing should work just fine.</p>",
              "rawMarkdown": "Yes, I guess the windowing should work just fine."
            }
          ]
        }
      ]
    }
  ],
  "comments": [
    {
      "id": 2423217,
      "author_name": "David Roberts",
      "author_url": "",
      "post_date": "2023-09-04T14:08:46.860000",
      "content": "<p>That's called \"Beam Hardening Effect\". It's coming from the EKG leads in the image.</p>",
      "votes": 1,
      "replies": []
    },
    {
      "id": 2422788,
      "author_name": "AnatoliK",
      "author_url": "",
      "post_date": "2023-09-04T08:44:02.197000",
      "content": "<p>They've become dark because on those slices, there was an object with higher intensities than bones, for example. If you look at the upper right corner of the slice, you will see a bright dot.</p>",
      "votes": 1,
      "replies": [
        {
          "id": 2422970,
          "author_name": "Gunes Evitan",
          "author_url": "",
          "post_date": "2023-09-04T11:39:17.370000",
          "content": "<p>Yeah and I think some patients may had metal objects with them. I guess we can deal with this issue with windowing right?</p>",
          "votes": 0,
          "replies": [
            {
              "id": 2423045,
              "author_name": "AnatoliK",
              "author_url": "",
              "post_date": "2023-09-04T12:16:08.547000",
              "content": "<p>Yes, I guess the windowing should work just fine.</p>",
              "votes": 0,
              "replies": []
            }
          ]
        }
      ]
    }
  ],
  "raw_markdown_by_id": {
    "2422654": "When I was looking for scans with unusual pixel intensity values, I found couple scans like this. I didn't use any windowing here. Some slices are suddenly becoming too dark and slices at 0:31 are really weird. Any idea what's happening here?\nhttps://streamable.com/5mwb7k",
    "2423217": "That's called \"Beam Hardening Effect\". It's coming from the EKG leads in the image.",
    "2422788": "They've become dark because on those slices, there was an object with higher intensities than bones, for example. If you look at the upper right corner of the slice, you will see a bright dot."
  }
}