I have some questions regarding given series_meta.csv files.
\n\n\naortic_hu - The volume of the aorta in hounsfield units. This acts as a reliable proxy for when the scan was. For a multiphasic CT scan, the higher value indicates the late arterial phase.
\n
Multiphasic means contrast media is injected into the patients veins and then the same anatomy is scanned at different intervals. The intervals are timed so as to capture the contrast filling the specific anatomy. It takes a few seconds for contrast media injected into your veins to go throughout your body (from veins, into the heart, then the lungs and then into the arteries, then into organs). Then, it takes more time for the contrast media to go through organs (lungs, kidneys, liver etc) and return into the venous system. There are general time delays that are somewhat standard across the industry.
\nThis ultimately lets us look at how arteries fill, how organs fill and how veins fill with blood. It's important to differentiate the blood from similarly dense tissue (water, fat etc), especially if you're looking for free blood, like in the case of a ruptured spleen, or an extravasation.
\nAortic HU refers to the HU measurement taken of the aorta during the arterial phase. If the aorta isn't dense, almost like bone .. then there isn't any contrast. The scan happened before the contrast reached the aorta .. or long after.
", "rawMarkdown": "Multiphasic means contrast media is injected into the patients veins and then the same anatomy is scanned at different intervals. The intervals are timed so as to capture the contrast filling the specific anatomy. It takes a few seconds for contrast media injected into your veins to go throughout your body (from veins, into the heart, then the lungs and then into the arteries, then into organs). Then, it takes more time for the contrast media to go through organs (lungs, kidneys, liver etc) and return into the venous system. There are general time delays that are somewhat standard across the industry.\n\nThis ultimately lets us look at how arteries fill, how organs fill and how veins fill with blood. It's important to differentiate the blood from similarly dense tissue (water, fat etc), especially if you're looking for free blood, like in the case of a ruptured spleen, or an extravasation.\n\nAortic HU refers to the HU measurement taken of the aorta during the arterial phase. If the aorta isn't dense, almost like bone .. then there isn't any contrast. The scan happened before the contrast reached the aorta .. or long after.", "votes": 5 }, { "id": 2388187, "postDate": "2023-08-13T07:45:48.727Z", "content": "I have some questions regarding given series_meta.csv files.
\n\n\naortic_hu - The volume of the aorta in hounsfield units. This acts as a reliable proxy for when the scan was. For a multiphasic CT scan, the higher value indicates the late arterial phase.
\n
checkout CT Scans and Contrast Phases the person has answered most of your questions.
", "rawMarkdown": "checkout [CT Scans and Contrast Phases](https://www.kaggle.com/competitions/rsna-2023-abdominal-trauma-detection/discussion/427226) the person has answered most of your questions.", "votes": 2 } ], "comments": [ { "id": 2388838, "author_name": "David Roberts", "author_url": "", "post_date": "2023-08-13T16:43:19.663000", "content": "Multiphasic means contrast media is injected into the patients veins and then the same anatomy is scanned at different intervals. The intervals are timed so as to capture the contrast filling the specific anatomy. It takes a few seconds for contrast media injected into your veins to go throughout your body (from veins, into the heart, then the lungs and then into the arteries, then into organs). Then, it takes more time for the contrast media to go through organs (lungs, kidneys, liver etc) and return into the venous system. There are general time delays that are somewhat standard across the industry.
\nThis ultimately lets us look at how arteries fill, how organs fill and how veins fill with blood. It's important to differentiate the blood from similarly dense tissue (water, fat etc), especially if you're looking for free blood, like in the case of a ruptured spleen, or an extravasation.
\nAortic HU refers to the HU measurement taken of the aorta during the arterial phase. If the aorta isn't dense, almost like bone .. then there isn't any contrast. The scan happened before the contrast reached the aorta .. or long after.
", "votes": 5, "replies": [] }, { "id": 2388682, "author_name": "golnaz ahmadvand", "author_url": "", "post_date": "2023-08-13T15:15:21.710000", "content": "checkout CT Scans and Contrast Phases the person has answered most of your questions.
", "votes": 2, "replies": [] } ], "raw_markdown_by_id": { "2388838": "Multiphasic means contrast media is injected into the patients veins and then the same anatomy is scanned at different intervals. The intervals are timed so as to capture the contrast filling the specific anatomy. It takes a few seconds for contrast media injected into your veins to go throughout your body (from veins, into the heart, then the lungs and then into the arteries, then into organs). Then, it takes more time for the contrast media to go through organs (lungs, kidneys, liver etc) and return into the venous system. There are general time delays that are somewhat standard across the industry.\n\nThis ultimately lets us look at how arteries fill, how organs fill and how veins fill with blood. It's important to differentiate the blood from similarly dense tissue (water, fat etc), especially if you're looking for free blood, like in the case of a ruptured spleen, or an extravasation.\n\nAortic HU refers to the HU measurement taken of the aorta during the arterial phase. If the aorta isn't dense, almost like bone .. then there isn't any contrast. The scan happened before the contrast reached the aorta .. or long after.", "2388187": "I have some questions regarding given series_meta.csv files.\n\n> aortic_hu - The volume of the aorta in hounsfield units. This acts as a reliable proxy for when the scan was. For a multiphasic CT scan, the higher value indicates the late arterial phase.\n\n* What is a multiphasic CT scan?\n* What is late arterial phase?\n* What is the meaning of aortic_hu value? Is it the value that corresponds to aorta in CT scans?\n* What it has to do with when the scan was?\n* Are those scans with high aortic_hu have are visibly different than the others?\n* Is there a general consensus of what is high/low for aortic_hu?\n", "2388682": "checkout [CT Scans and Contrast Phases](https://www.kaggle.com/competitions/rsna-2023-abdominal-trauma-detection/discussion/427226) the person has answered most of your questions." } }