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So now let's examine what is dual energy CT physics.

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Dual energy CT became possible with the

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multi-detector CT again.

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We have been doing dual energy CT at

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our institution for almost 15, 20 years.

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So what is dual energy CT?

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We can look at this part from telling how is dual energy CT done,

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and where is dual energy CT is actually thriving,

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and what about dual energy CT in radiation therapy, and also discuss

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about some of the advantages and limitation.

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First and foremost, as the name suggests, dual energy CT

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uses two X-ray photon spectrum to create images.

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This will enable differentiation and classification of

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tissue composition.

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Dual energy CT is also often called spectral CT.

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It's almost a precursor to the photon counting CT and

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every other CTs which we expect to come along.

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So spectral CT is a broader term, which is also used for dual

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energy CT or photon counting CT.

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So the dual energy CT, which is also called a spectral CT, the main

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purpose here is the utilization of two x-ray photon

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spectra. The generation of two x-ray

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spectra varies among different CT

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vendors. Vendors have taken different pathways

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to achieve the same of obtaining two x-ray

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spectra. So I want to briefly discuss this, how it's been done.