I am new to this competition and have been confused about baseline CT and initial FVC. As you seen, there is a description about this in data description: \"A patient has an image acquired at time Week = 0 and has numerous follow up visits over the course of approximately 1-2 years, at which time their FVC is measured.\"
\nIn train.csv, many patients don't have FVC record of week 0, so which FVC does the baseline CT correspond to? Is the first line FVC of the patient or week 0 FVC?
", "messages": [ { "id": "993555", "postDate": "09/01/2020 02:41:18", "content": "I am new to this competition and have been confused about baseline CT and initial FVC. As you seen, there is a description about this in data description: \"A patient has an image acquired at time Week = 0 and has numerous follow up visits over the course of approximately 1-2 years, at which time their FVC is measured.\"
\nIn train.csv, many patients don't have FVC record of week 0, so which FVC does the baseline CT correspond to? Is the first line FVC of the patient or week 0 FVC?
", "rawMarkdown": "I am new to this competition and have been confused about baseline CT and initial FVC. As you seen, there is a description about this in data description: \"A patient has an image acquired at time Week = 0 and has numerous follow up visits over the course of approximately 1-2 years, at which time their FVC is measured.\" \n\nIn train.csv, many patients don't have FVC record of week 0, so which FVC does the baseline CT correspond to? Is the first line FVC of the patient or week 0 FVC?", "votes": null }, { "id": "993579", "postDate": "09/01/2020 03:02:02", "content": "CT images of a patient are at Week 0 and its only to show the scan of lung, while FVC is a totally different thing, i.e. capacity of the lung, since capacity of lungs of a patient may change over time due to various reasons like smoking etc. It is taken over a period of time. There is no connection in FVC and CT scans in that perspective.
\nAlso, all the readings are taken over a period with the week of CT scans of all patients as reference i.e. Week 0.
", "rawMarkdown": "CT images of a patient are at Week 0 and its only to show the scan of lung, while FVC is a totally different thing, i.e. capacity of the lung, since capacity of lungs of a patient may change over time due to various reasons like smoking etc. It is taken over a period of time. There is no connection in FVC and CT scans in that perspective. \n\nAlso, all the readings are taken over a period with the week of CT scans of all patients as reference i.e. Week 0.", "votes": null }, { "id": "997691", "postDate": "09/04/2020 07:16:46", "content": "Hi! In my understanding, patients without FVC measured in week = 0 simply didn't have their FVC measured the same week they took the CT scan. Remember, this is real world data, so it's quite plausible that when people first visited a doctor, the doctor asked for a CT scan and the person was only able to make it happens some weeks later (usually in an image diagnostics place, not the doctor's office). In such cases, the first FVC would be in a negative week (ie, before the CT was taken).
", "rawMarkdown": "Hi! In my understanding, patients without FVC measured in week = 0 simply didn't have their FVC measured the same week they took the CT scan. Remember, this is real world data, so it's quite plausible that when people first visited a doctor, the doctor asked for a CT scan and the person was only able to make it happens some weeks later (usually in an image diagnostics place, not the doctor's office). In such cases, the first FVC would be in a negative week (ie, before the CT was taken).", "votes": null }, { "id": "997701", "postDate": "09/04/2020 07:25:55", "content": "Oh, great! What you said is really reasonable! Thank you for your reply.
", "rawMarkdown": "Oh, great! What you said is really reasonable! Thank you for your reply.", "votes": null }, { "id": "997726", "postDate": "09/04/2020 07:50:54", "content": "Thank you for sharing the question, and best of luck in the competition!
", "rawMarkdown": "Thank you for sharing the question, and best of luck in the competition!", "votes": null }, { "id": "1031775", "postDate": "09/29/2020 17:18:37", "content": "@douglaskgaraujo are the slices part of Sigle CT report or each slice means a single CT report i.e 300 slices means 300 ct report ?
", "rawMarkdown": "douglaskgaraujo are the slices part of Sigle CT report or each slice means a single CT report i.e 300 slices means 300 ct report ?", "votes": null }, { "id": "1031837", "postDate": "09/29/2020 17:55:52", "content": "Thanks, Doug!
\n@jaideepvalani All slices come from a single CT. CT imaging produces a 3D volume for each scan, this volume consists of 2D slices, each slice is a dcm image in our case. In other words, by stacking 2D images, you get the volume (case or patient). They're all taken at the same time. I hope this helps.
@ahmedhshahin
\nTHanks..
\nWHy do we have so much variation in no f slices of different patients,some variation can be attribute to kind of CT machine.
Yes, this can happen for several reasons.
", "rawMarkdown": "Yes, this can happen for several reasons.", "votes": null } ], "comments": [ { "id": 993579, "author_name": "sarques", "author_url": "", "post_date": "09/01/2020 03:02:02", "content": "CT images of a patient are at Week 0 and its only to show the scan of lung, while FVC is a totally different thing, i.e. capacity of the lung, since capacity of lungs of a patient may change over time due to various reasons like smoking etc. It is taken over a period of time. There is no connection in FVC and CT scans in that perspective.
\nAlso, all the readings are taken over a period with the week of CT scans of all patients as reference i.e. Week 0.
", "votes": null, "replies": [] }, { "id": 997691, "author_name": "douglaskgaraujo", "author_url": "", "post_date": "09/04/2020 07:16:46", "content": "Hi! In my understanding, patients without FVC measured in week = 0 simply didn't have their FVC measured the same week they took the CT scan. Remember, this is real world data, so it's quite plausible that when people first visited a doctor, the doctor asked for a CT scan and the person was only able to make it happens some weeks later (usually in an image diagnostics place, not the doctor's office). In such cases, the first FVC would be in a negative week (ie, before the CT was taken).
", "votes": null, "replies": [ { "id": 997701, "author_name": "shangweichen", "author_url": "", "post_date": "09/04/2020 07:25:55", "content": "Oh, great! What you said is really reasonable! Thank you for your reply.
", "votes": null, "replies": [] }, { "id": 997726, "author_name": "douglaskgaraujo", "author_url": "", "post_date": "09/04/2020 07:50:54", "content": "Thank you for sharing the question, and best of luck in the competition!
", "votes": null, "replies": [] }, { "id": 1031775, "author_name": "jaideepvalani", "author_url": "", "post_date": "09/29/2020 17:18:37", "content": "@douglaskgaraujo are the slices part of Sigle CT report or each slice means a single CT report i.e 300 slices means 300 ct report ?
", "votes": null, "replies": [] }, { "id": 1031837, "author_name": "ahmedhshahin", "author_url": "", "post_date": "09/29/2020 17:55:52", "content": "Thanks, Doug!
\n@jaideepvalani All slices come from a single CT. CT imaging produces a 3D volume for each scan, this volume consists of 2D slices, each slice is a dcm image in our case. In other words, by stacking 2D images, you get the volume (case or patient). They're all taken at the same time. I hope this helps.
@ahmedhshahin
\nTHanks..
\nWHy do we have so much variation in no f slices of different patients,some variation can be attribute to kind of CT machine.
Yes, this can happen for several reasons.
", "votes": null, "replies": [] } ] } ], "raw_markdown_by_id": { "993555": "I am new to this competition and have been confused about baseline CT and initial FVC. As you seen, there is a description about this in data description: \"A patient has an image acquired at time Week = 0 and has numerous follow up visits over the course of approximately 1-2 years, at which time their FVC is measured.\" \n\nIn train.csv, many patients don't have FVC record of week 0, so which FVC does the baseline CT correspond to? Is the first line FVC of the patient or week 0 FVC?", "993579": "CT images of a patient are at Week 0 and its only to show the scan of lung, while FVC is a totally different thing, i.e. capacity of the lung, since capacity of lungs of a patient may change over time due to various reasons like smoking etc. It is taken over a period of time. There is no connection in FVC and CT scans in that perspective. \n\nAlso, all the readings are taken over a period with the week of CT scans of all patients as reference i.e. Week 0.", "997691": "Hi! In my understanding, patients without FVC measured in week = 0 simply didn't have their FVC measured the same week they took the CT scan. Remember, this is real world data, so it's quite plausible that when people first visited a doctor, the doctor asked for a CT scan and the person was only able to make it happens some weeks later (usually in an image diagnostics place, not the doctor's office). In such cases, the first FVC would be in a negative week (ie, before the CT was taken).", "997701": "Oh, great! What you said is really reasonable! Thank you for your reply.", "997726": "Thank you for sharing the question, and best of luck in the competition!", "1031775": "douglaskgaraujo are the slices part of Sigle CT report or each slice means a single CT report i.e 300 slices means 300 ct report ?", "1031837": "Thanks, Doug! \n@jaideepvalani All slices come from a single CT. CT imaging produces a 3D volume for each scan, this volume consists of 2D slices, each slice is a dcm image in our case. In other words, by stacking 2D images, you get the volume (case or patient). They're all taken at the same time. I hope this helps.", "1031842": "ahmedhshahin\nTHanks..\nWHy do we have so much variation in no f slices of different patients,some variation can be attribute to kind of CT machine.", "1033070": "Yes, this can happen for several reasons." }, "source": "meta" }