{
  "id": 18172,
  "title": "Identification of LV",
  "url": "/competitions/second-annual-data-science-bowl/discussion/18172",
  "author_name": "",
  "post_date": "2015-12-28T20:30:59.930Z",
  "votes": null,
  "comment_count": 2,
  "views": 793,
  "content": "<p>I've watched the videos and followed the tutorials but am not confident that I can visually identify the LV.  Is there a rule of thumb for visually identifying the LV as distinct from other features of the heart?  For instance, in the attached image (output from Fourier tutorial), is the segmented region correctly identified as the LV or is the true LV another one of the blood pools?  How can I know?</p>",
  "messages": [
    {
      "id": "103084",
      "postDate": "12/28/2015 20:30:59",
      "content": "<p>I've watched the videos and followed the tutorials but am not confident that I can visually identify the LV.  Is there a rule of thumb for visually identifying the LV as distinct from other features of the heart?  For instance, in the attached image (output from Fourier tutorial), is the segmented region correctly identified as the LV or is the true LV another one of the blood pools?  How can I know?</p>",
      "rawMarkdown": "I've watched the videos and followed the tutorials but am not confident that I can visually identify the LV.  Is there a rule of thumb for visually identifying the LV as distinct from other features of the heart?  For instance, in the attached image (output from Fourier tutorial), is the segmented region correctly identified as the LV or is the true LV another one of the blood pools?  How can I know?",
      "votes": null
    },
    {
      "id": "103096",
      "postDate": "12/28/2015 21:55:44",
      "content": "<p>The contour on the attached image appears to be on the right ventricle instead of the left. So it is NOT correctly identified as the LV. </p>\n\n<p>The identification of the LV is  based on several factors, in most cases it is pretty straightforward. The left ventricle pumps blood into the systemic circulation where the pressure is higher than the pulmonary circulation. Consequently, the wall of the LV is often thicker than the RV. However, there are pathological cases where the pressure is high on the right side (e.g., pulmonary hypertension) and then the wall of the RV is thicker than normal and can be as thick as the LV. In any case, the LV is the on the side of the heart that pumps blood into the systemic circulation, i.e., the side of the heart that collects blood from the pulmonary veins and is connected to the aorta. In the datasets in this competition, we have also tried to supply a 2-chamber and a 4-chamber view. The 2-chamber should contain a view of the LV and the LA (left atrium) and the 4-chamber view should contain all 4 chambers of the heart. Where the 2-ch and 4-ch intersect is probably where you would find the LV. Imagine the intersection of the 2-ch and 4-ch views forming a line that passes down through the axis of the short axis views. This method of ventricle identification is not foolproof, but it will do pretty good. Look for a thick-walled chamber where the 2-ch and 4-ch intersect. </p>\n\n<p>Hope this helps,\nMichael </p>",
      "rawMarkdown": "The contour on the attached image appears to be on the right ventricle instead of the left. So it is NOT correctly identified as the LV. \r\n\r\nThe identification of the LV is  based on several factors, in most cases it is pretty straightforward. The left ventricle pumps blood into the systemic circulation where the pressure is higher than the pulmonary circulation. Consequently, the wall of the LV is often thicker than the RV. However, there are pathological cases where the pressure is high on the right side (e.g., pulmonary hypertension) and then the wall of the RV is thicker than normal and can be as thick as the LV. In any case, the LV is the on the side of the heart that pumps blood into the systemic circulation, i.e., the side of the heart that collects blood from the pulmonary veins and is connected to the aorta. In the datasets in this competition, we have also tried to supply a 2-chamber and a 4-chamber view. The 2-chamber should contain a view of the LV and the LA (left atrium) and the 4-chamber view should contain all 4 chambers of the heart. Where the 2-ch and 4-ch intersect is probably where you would find the LV. Imagine the intersection of the 2-ch and 4-ch views forming a line that passes down through the axis of the short axis views. This method of ventricle identification is not foolproof, but it will do pretty good. Look for a thick-walled chamber where the 2-ch and 4-ch intersect. \r\n\r\nHope this helps,\r\nMichael",
      "votes": null
    },
    {
      "id": "103163",
      "postDate": "12/29/2015 15:49:02",
      "content": "<p>Thanks Michael!  That helps me know what to look for.</p>",
      "rawMarkdown": "Thanks Michael!  That helps me know what to look for.",
      "votes": null
    }
  ],
  "comments": [
    {
      "id": 103096,
      "author_name": "michaelhansen",
      "author_url": "",
      "post_date": "12/28/2015 21:55:44",
      "content": "<p>The contour on the attached image appears to be on the right ventricle instead of the left. So it is NOT correctly identified as the LV. </p>\n\n<p>The identification of the LV is  based on several factors, in most cases it is pretty straightforward. The left ventricle pumps blood into the systemic circulation where the pressure is higher than the pulmonary circulation. Consequently, the wall of the LV is often thicker than the RV. However, there are pathological cases where the pressure is high on the right side (e.g., pulmonary hypertension) and then the wall of the RV is thicker than normal and can be as thick as the LV. In any case, the LV is the on the side of the heart that pumps blood into the systemic circulation, i.e., the side of the heart that collects blood from the pulmonary veins and is connected to the aorta. In the datasets in this competition, we have also tried to supply a 2-chamber and a 4-chamber view. The 2-chamber should contain a view of the LV and the LA (left atrium) and the 4-chamber view should contain all 4 chambers of the heart. Where the 2-ch and 4-ch intersect is probably where you would find the LV. Imagine the intersection of the 2-ch and 4-ch views forming a line that passes down through the axis of the short axis views. This method of ventricle identification is not foolproof, but it will do pretty good. Look for a thick-walled chamber where the 2-ch and 4-ch intersect. </p>\n\n<p>Hope this helps,\nMichael </p>",
      "votes": null,
      "replies": []
    },
    {
      "id": 103163,
      "author_name": "madcastle82",
      "author_url": "",
      "post_date": "12/29/2015 15:49:02",
      "content": "<p>Thanks Michael!  That helps me know what to look for.</p>",
      "votes": null,
      "replies": []
    }
  ],
  "raw_markdown_by_id": {
    "103084": "I've watched the videos and followed the tutorials but am not confident that I can visually identify the LV.  Is there a rule of thumb for visually identifying the LV as distinct from other features of the heart?  For instance, in the attached image (output from Fourier tutorial), is the segmented region correctly identified as the LV or is the true LV another one of the blood pools?  How can I know?",
    "103096": "The contour on the attached image appears to be on the right ventricle instead of the left. So it is NOT correctly identified as the LV. \r\n\r\nThe identification of the LV is  based on several factors, in most cases it is pretty straightforward. The left ventricle pumps blood into the systemic circulation where the pressure is higher than the pulmonary circulation. Consequently, the wall of the LV is often thicker than the RV. However, there are pathological cases where the pressure is high on the right side (e.g., pulmonary hypertension) and then the wall of the RV is thicker than normal and can be as thick as the LV. In any case, the LV is the on the side of the heart that pumps blood into the systemic circulation, i.e., the side of the heart that collects blood from the pulmonary veins and is connected to the aorta. In the datasets in this competition, we have also tried to supply a 2-chamber and a 4-chamber view. The 2-chamber should contain a view of the LV and the LA (left atrium) and the 4-chamber view should contain all 4 chambers of the heart. Where the 2-ch and 4-ch intersect is probably where you would find the LV. Imagine the intersection of the 2-ch and 4-ch views forming a line that passes down through the axis of the short axis views. This method of ventricle identification is not foolproof, but it will do pretty good. Look for a thick-walled chamber where the 2-ch and 4-ch intersect. \r\n\r\nHope this helps,\r\nMichael",
    "103163": "Thanks Michael!  That helps me know what to look for."
  },
  "source": "meta"
}