Sorry for such newbie questions but i did not understand the following things-\n1.Why there are different number of slices for each patients CT scan?\n2.Combination of all slices is a 3-D image of the lung or a video of a single breath of patient?
", "messages": [ { "id": 930920, "postDate": "2020-07-15T20:13:47.870Z", "content": "Your first question is answered here: https://www.kaggle.com/c/osic-pulmonary-fibrosis-progression/discussion/167200
\n\nThe answer to the second question is here: https://www.kaggle.com/c/osic-pulmonary-fibrosis-progression/discussion/167085
\n\nTL;DR:\n1) Number of slices is machine, operator, study type, and parameter dependent\n2) The patient is typically taking a deep breath, and holding it while the CT scanner starts from the top (neck region) and moves towards the abdomen and so each slice is a single cross sectional image. The number of images is related t the slice \"thickness\" so a thinner slice results in more images.
", "rawMarkdown": "Your first question is answered here: https://www.kaggle.com/c/osic-pulmonary-fibrosis-progression/discussion/167200\n\nThe answer to the second question is here: https://www.kaggle.com/c/osic-pulmonary-fibrosis-progression/discussion/167085\n\nTL;DR:\n1) Number of slices is machine, operator, study type, and parameter dependent\n2) The patient is typically taking a deep breath, and holding it while the CT scanner starts from the top (neck region) and moves towards the abdomen and so each slice is a single cross sectional image. The number of images is related t the slice \"thickness\" so a thinner slice results in more images.", "votes": 2, "replies": [ { "id": 930935, "postDate": "2020-07-15T20:25:44.530Z", "content": "Thanks for the Answer,
\n\nSo what i understand is :\nIt is a short video of patients lung's CT scan of single breath, and not a 3D image of a lung of patient.\nThe reason why they vary is type of machine and Preprocessing are different for different cases.\nThey all are capturing same thing i.e. single breath video but due to all these diferent techniques we have different number of files.
\n\nPlease correct me if I'm wrong.
", "rawMarkdown": "Thanks for the Answer,\n\nSo what i understand is :\nIt is a short video of patients lung's CT scan of single breath, and not a 3D image of a lung of patient.\nThe reason why they vary is type of machine and Preprocessing are different for different cases.\nThey all are capturing same thing i.e. single breath video but due to all these diferent techniques we have different number of files. \n\nPlease correct me if I'm wrong." }, { "id": 930958, "postDate": "2020-07-15T20:55:07.697Z", "content": "Hi @sourabh219 I guess what makes it confusing is that technically there is a time element. But this time element is removed (to the best of the CT technician's ability) by having the patient absolutely still while the scan is performed. If the patient moves, then you get \"motion artifacts\" where the images blur.
\n\nIn reality, what the CT technician and radiologists are hoping to get is a series of images in which the patient is still, where if you consider each slice to have a X and Y axis, then the progression between slices is movement along the Z axis (physical space, not time). That is the only reason why I would not call it a video.
", "rawMarkdown": "Hi @sourabh219 I guess what makes it confusing is that technically there is a time element. But this time element is removed (to the best of the CT technician's ability) by having the patient absolutely still while the scan is performed. If the patient moves, then you get \"motion artifacts\" where the images blur. \n\nIn reality, what the CT technician and radiologists are hoping to get is a series of images in which the patient is still, where if you consider each slice to have a X and Y axis, then the progression between slices is movement along the Z axis (physical space, not time). That is the only reason why I would not call it a video.", "votes": 1 }, { "id": 930986, "postDate": "2020-07-15T21:32:06.993Z", "content": "So, as patient body is still we technically don't have the time factor here but space as only space changes in image.(as patient breathes).so this captures the change in volume of lungs as patient breathes,am i correct?
", "rawMarkdown": "So, as patient body is still we technically don't have the time factor here but space as only space changes in image.(as patient breathes).so this captures the change in volume of lungs as patient breathes,am i correct? " }, { "id": 930997, "postDate": "2020-07-15T21:54:53.977Z", "content": "This only captures the structural aspect of the patient's chest at that point in time (i.e. week 0).
\n\nTechnically, the use of the word volume can be misleading. You can get the volume of the lung based on performing calculations of the slices, but this does not directly correlate with the functional volume of the lung. Arguably, the point of this competition is to find a way to incorporate imaging and functional tests to get a better model of the underlying pathophysiology. I hope that makes sense!
", "rawMarkdown": "This only captures the structural aspect of the patient's chest at that point in time (i.e. week 0). \n\nTechnically, the use of the word volume can be misleading. You can get the volume of the lung based on performing calculations of the slices, but this does not directly correlate with the functional volume of the lung. Arguably, the point of this competition is to find a way to incorporate imaging and functional tests to get a better model of the underlying pathophysiology. I hope that makes sense!", "votes": 1 }, { "id": 931007, "postDate": "2020-07-15T22:20:20.410Z", "content": "You are seeing slices through a 3-D volume. Although the images take about 15 seconds to acquire (slice by slice), the patient is normally holding their breath the entire time. So, it is not a \"video\". It is multiple slices from neck to upper abdomen (or upper abdomen to neck). If you stack the slices on top of each other, you have a 3-D volume.
\n\nWe sometimes do CT scans where the patient purposely fully blows out all air before we take the scan. Typically for routine scans (and probably for these scans) the patient takes a deep breath and holds it.
\n\nYou are not watching somebody breath in and out. It just looks that way because the top of the lungs are smaller than the bottom.
", "rawMarkdown": "You are seeing slices through a 3-D volume. Although the images take about 15 seconds to acquire (slice by slice), the patient is normally holding their breath the entire time. So, it is not a \"video\". It is multiple slices from neck to upper abdomen (or upper abdomen to neck). If you stack the slices on top of each other, you have a 3-D volume.\n\nWe sometimes do CT scans where the patient purposely fully blows out all air before we take the scan. Typically for routine scans (and probably for these scans) the patient takes a deep breath and holds it.\n\nYou are not watching somebody breath in and out. It just looks that way because the top of the lungs are smaller than the bottom.", "votes": 1 }, { "id": 931735, "postDate": "2020-07-16T12:16:10.457Z", "content": "thanks that makes sense!
", "rawMarkdown": "thanks that makes sense!\n" }, { "id": 931736, "postDate": "2020-07-16T12:16:29.267Z", "rawMarkdown": "", "isDeleted": true } ] }, { "id": 930912, "postDate": "2020-07-15T19:58:13.157Z", "content": "Sorry for such newbie questions but i did not understand the following things-\n1.Why there are different number of slices for each patients CT scan?\n2.Combination of all slices is a 3-D image of the lung or a video of a single breath of patient?
", "rawMarkdown": "Sorry for such newbie questions but i did not understand the following things-\n1.Why there are different number of slices for each patients CT scan?\n2.Combination of all slices is a 3-D image of the lung or a video of a single breath of patient? " } ], "comments": [ { "id": 930920, "author_name": "JJ", "author_url": "", "post_date": "2020-07-15T20:13:47.870000", "content": "Your first question is answered here: https://www.kaggle.com/c/osic-pulmonary-fibrosis-progression/discussion/167200
\n\nThe answer to the second question is here: https://www.kaggle.com/c/osic-pulmonary-fibrosis-progression/discussion/167085
\n\nTL;DR:\n1) Number of slices is machine, operator, study type, and parameter dependent\n2) The patient is typically taking a deep breath, and holding it while the CT scanner starts from the top (neck region) and moves towards the abdomen and so each slice is a single cross sectional image. The number of images is related t the slice \"thickness\" so a thinner slice results in more images.
", "votes": 2, "replies": [ { "id": 930935, "author_name": "Sourabh Ghorpade", "author_url": "", "post_date": "2020-07-15T20:25:44.530000", "content": "Thanks for the Answer,
\n\nSo what i understand is :\nIt is a short video of patients lung's CT scan of single breath, and not a 3D image of a lung of patient.\nThe reason why they vary is type of machine and Preprocessing are different for different cases.\nThey all are capturing same thing i.e. single breath video but due to all these diferent techniques we have different number of files.
\n\nPlease correct me if I'm wrong.
", "votes": 0, "replies": [] }, { "id": 930958, "author_name": "JJ", "author_url": "", "post_date": "2020-07-15T20:55:07.697000", "content": "Hi @sourabh219 I guess what makes it confusing is that technically there is a time element. But this time element is removed (to the best of the CT technician's ability) by having the patient absolutely still while the scan is performed. If the patient moves, then you get \"motion artifacts\" where the images blur.
\n\nIn reality, what the CT technician and radiologists are hoping to get is a series of images in which the patient is still, where if you consider each slice to have a X and Y axis, then the progression between slices is movement along the Z axis (physical space, not time). That is the only reason why I would not call it a video.
", "votes": 1, "replies": [] }, { "id": 930986, "author_name": "Sourabh Ghorpade", "author_url": "", "post_date": "2020-07-15T21:32:06.993000", "content": "So, as patient body is still we technically don't have the time factor here but space as only space changes in image.(as patient breathes).so this captures the change in volume of lungs as patient breathes,am i correct?
", "votes": 0, "replies": [] }, { "id": 930997, "author_name": "JJ", "author_url": "", "post_date": "2020-07-15T21:54:53.977000", "content": "This only captures the structural aspect of the patient's chest at that point in time (i.e. week 0).
\n\nTechnically, the use of the word volume can be misleading. You can get the volume of the lung based on performing calculations of the slices, but this does not directly correlate with the functional volume of the lung. Arguably, the point of this competition is to find a way to incorporate imaging and functional tests to get a better model of the underlying pathophysiology. I hope that makes sense!
", "votes": 1, "replies": [] }, { "id": 931007, "author_name": "quadcore/Richard Epstein", "author_url": "", "post_date": "2020-07-15T22:20:20.410000", "content": "You are seeing slices through a 3-D volume. Although the images take about 15 seconds to acquire (slice by slice), the patient is normally holding their breath the entire time. So, it is not a \"video\". It is multiple slices from neck to upper abdomen (or upper abdomen to neck). If you stack the slices on top of each other, you have a 3-D volume.
\n\nWe sometimes do CT scans where the patient purposely fully blows out all air before we take the scan. Typically for routine scans (and probably for these scans) the patient takes a deep breath and holds it.
\n\nYou are not watching somebody breath in and out. It just looks that way because the top of the lungs are smaller than the bottom.
", "votes": 1, "replies": [] }, { "id": 931735, "author_name": "Sourabh Ghorpade", "author_url": "", "post_date": "2020-07-16T12:16:10.457000", "content": "thanks that makes sense!
", "votes": 0, "replies": [] }, { "id": 931736, "author_name": "", "author_url": "", "post_date": "2020-07-16T12:16:29.267000", "content": "", "votes": 0, "replies": [] } ] } ], "raw_markdown_by_id": { "930920": "Your first question is answered here: https://www.kaggle.com/c/osic-pulmonary-fibrosis-progression/discussion/167200\n\nThe answer to the second question is here: https://www.kaggle.com/c/osic-pulmonary-fibrosis-progression/discussion/167085\n\nTL;DR:\n1) Number of slices is machine, operator, study type, and parameter dependent\n2) The patient is typically taking a deep breath, and holding it while the CT scanner starts from the top (neck region) and moves towards the abdomen and so each slice is a single cross sectional image. The number of images is related t the slice \"thickness\" so a thinner slice results in more images.", "930912": "Sorry for such newbie questions but i did not understand the following things-\n1.Why there are different number of slices for each patients CT scan?\n2.Combination of all slices is a 3-D image of the lung or a video of a single breath of patient? " } }