Is there technology to accurately measure a person`s size?

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We can measure an asteroid way out in space. Surely we can measure a person right in front of us. I am thinking of a system which could for example tell me that in this moment I am 5.455 cubic feet, something like weighing myself but in feet instead of in pounds using s digital camera.

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Answer
Sure, any 3D scanner could tell you that, though it's useless information.

How does the CT SCAN,MRI,and PET scanners can help to diagnose some disease of the reproductive system?

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Answer
Each one provides a different way to construct a 3D image of internal organs. Because they use different physical phenomena, they detect different aspects of the body's structure and function.

CT scans are regular X-rays. They do best at finding dense tissues, especially bones and some kinds of tumors. Doctors sometimes use dyes that show up on X-rays to add contrast to images of soft tissue. MRI interacts with the hydrogen atoms in body tissues, and senses some features of the chemical environment at each point in the body. PET always uses a slightly radioactive dye, and measures where the dye goes. For example, PET sometimes uses a sugar-based dye, and detects which parts of the body or brain consume that sugar - this measures energy consumption. Other dyes accumulate in different parts of the body, for different chemical reasons.

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Title Post: Is there technology to accurately measure a person`s size?
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