Pumpkin CT Scan


Radiologo Alan Nazerian hat ’nen Kürbis in einen CT-Scanner gelegt. Das Video unten finde ich recht langweilig und vorhersehbar, aber ich liebe die 3D-Renderings, die dabei herauskamen. (via Prosthetic Knowledge)


The original source images were obtained by scanning the pumpkin through from one side to the other while the pumpkin was upright. These 600 micron thick slices were then reconstructed on the GE scanner into the axial plane, with similar slice thickness. With isotropic voxels, this reconstruction introduced no loss of spatial resolution. The source image data was then loaded onto the iNtuition Advanced Visualization workstation (TeraRecon, Foster City CA) where further manipulation and processing could be performed. Aside from simple cropping and resizing the large files, no raster graphics editor was used to create the images.

Below is a 34 second video showing a cine-sequence of the axial reconstruction images, from the top through the bottom. The first few images show the pumpkin's stem.

The structure of the pumpkin is pretty interesting. I was surprised by the degree of detail and structure visible. Firstly, notice the pattern of these tubular-looking "channels" or "vessels" that are seen running through the wall of the pumpkin. They appear to be running roughly like lines of "latitude" through the pumpkin if the stem was say the North Pole. There is also a "core" of tissue running through the fruit from pole-to-pole, and from this core, you can see fine straight tendrils of what I assume are these same sort of "vessels" going out radially from the core to supply the seeds and fleshy walls. I didn't expect to see such great detail. It's clear that these fine tendrils are what make up that yucky, stringy stuff, familiar to anyone who's ever carved a pumpkin and gutted out the insides.

Next, it's obvious how much air there is in a pumpkin. All the black on these source images represent air, quite a bit of its overall volume. The seeds are also well-demonstrated. They appear the brighter than most other parts of the pumpkin (on the source scan,) indicating that their composition is of higher radiodensity.