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Published byMadlyn York Modified over 9 years ago
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Medical Imaging
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What is an image? ● An image is a function – from a spatial or temporal domain – into a two, three, or four dimensional space – such that the function value can be seen
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Understanding Images ● To understand an image one must – know the input domain – know the output domain – know the function value ● What does an image represent? – You must look at what each pixel represents based on the above criteria
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Photography ● Photography images the three-dimensional world onto a two-dimensional plane – early photography was monochrome ● intensity was a function of ambient lighting ● intensity was a function of spectral sensitivity – the function value can be color (ideally same as input) – images are scaled in most cases
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Maps ● Historically maps scaled and distorted the curved surface of the earth onto a smaller flat plane ● Modern maps combine multiple sources of information about the earth ● Features are represented by – color – shading – texture – geometric shapes
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Medical Imaging ● How can we see inside a person? ● Can we diagnose disease from images? ● Can we monitor progress of healing?
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Challenges ● Patient health ● Patient comfort ● Motion of patient ● Motion of internal features ● Cost
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Types of Medical Imaging ● Transmission – X-rays – Nuclear Medicine ● Reflectance – Ultrasound – Photography ● Slice (can produce 3D images) – CT – MRI – PET – SPECT
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