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HDRi a World Technology

HDR in Medicine

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HDR in Medicine
HDR in Cinematography
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Paul Debevec's pioneering HDR technology has been useful in areas other than photography, one of which is medicine. HDR comes in handy when dealing with volume data such as length, depth, consistency, texture, etc. This technology is called Volumetric HDR. In the medical field, most of these aspects are measured in terms of muscles, skin, bones, organs, and bodily fluid. The problem comes in the film portion. Doctors use measuring devices such as CT. scanners, and MRI scanners. Although these devices are competent, the level of accuracy needed in the medical profession is not satisfied. Also, due to the advances of medicine, HDR technology was bound to follow.

The typical MRI scanner generates a 12 bit integer, which is converted to an 8 bit image, because the displays can only handle those gray or color levels. As medicine advances, more precise/ clear images are needed.

These are image slice from MRI CISS dataset
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(Right) Original 8bit image slice, (Left) VHDR enhanced 8bit image slice

VHDR has uses the disparities in the image to enhance the low level dataset. The figure above is a perfect example. Due to the low voxel data, image (a) from the MRI is weak and dark. However, after VHDR, the contrast between black, white, and grey enhance. More depth and clarity is visible.

Photographs of volume rendering of a head CT datas
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They were captured at 4 f-stops apart.

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These are CT scans from the dental profession. The left pair of images were captured 4 flash stops apart. Image 1 is a general VHDR photo. Image 2 is a CT photo using dental technology. Image 3 is increased with background noise. Image 4 is dental technology with increased background noise.

The image is number: Top row 1-2
Bottom row 3-4