Posts by digastricus@qoto.org
 (DIR) Post #AZmSlz522RNOB01ynQ by digastricus@qoto.org
       2023-09-15T04:54:49Z
       
       0 likes, 1 repeats
       
       @freemo @kithop On the contrary! Volumetric rendering is normally done with CT imaging, not MRI (and I suspect, yours is a CT as well). MRI has good resolution in the scanning plane, but needs to aquire each plane separately, so has not enough data in the z direction. Since CT is aquired as a high res spiral, you have all the voxels you need; the CT images you would get to see are already reconstructions from the original volumetric data. And soft tissue is no problem either, you clearly see liver, kidneys, spleen, pancreas, adrenal glands etc ona native CT image. The MRI on contrast does not show bones that well (depending on the sequence used, they do show the fatty bone marrow). And it is not that usual to do a full imaging of chest and abdomen using MRI (you would need different positions in the device and at least two extra coils, not talking about the long image aquiring time).
       
 (DIR) Post #AZmTqAq2MbuHkwZxCa by digastricus@qoto.org
       2023-09-15T05:06:48Z
       
       0 likes, 0 repeats
       
       @freemo @kithop I'm not a radiologist or physicist, so not an expert either. But due to being a doctor in internal medicine a see these images every day. The difference is easy to spot: CT is relatively quiet and has a spinning part. MRI makes funny noises and has a rather small tunnel you have to lay in. Normally, you'd get an extra coil on the body part being scanned.
       
 (DIR) Post #AZnSRdSwssyaVWTV5M by digastricus@qoto.org
       2023-09-15T16:25:53Z
       
       0 likes, 1 repeats
       
       @freemo @kithop This sounds like an MRI indeed! A contrast agent can be used with both, CT and MRI. You can also look at the original images: With CT (which is x-ray), the bones appear white (as are calcifications, the contrast agent and metal). With MRI, it depends on the sequence used. T2: more water content ~ more white. T1: more fat ~ more white, roughly. But there are many more.