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The topic of discussion is physics of radiography and

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mammography.

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These are the part I just want to talk about introduction to medical imaging,

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because medical imaging requires some form of radiation

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capable of penetrating tissue.

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I'm talking about medical X-ray imaging.

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I'm not talking about MRI or ultrasound.

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With respect to medical X-ray imaging, it requires some amount of

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radiation capable of penetrating the tissues.

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Radiation needs to interact with body's tissues in some

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differential manner to provide contrast, which means

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if the radiation exposure goes through the body uniformly,

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there'll be no contrast in the image.

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And that plays into how radiography and medical X-ray

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imaging are limited in the range of X-ray

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energies we can use it for imaging.

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The diagnostic utility of medical imaging relates to both

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image quality, the technical quality, and also the

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acquisition conditions.

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At the end of the day, any images we create, the image

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quality requires many trade-offs, such as

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we have to take into care the patient safety.

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Means how much amount of radiation we can use for imaging,

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spatial resolution, temporal resolution,

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noise property, contrast resolution, and many other

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factors. So all of them have to interplay in a

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right way to get the optimal image with the minimum

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dose as possible.