Question
In a MRI, various chemical shifts of absorbing protons are translated into ____.
Answer
In a MRI, various chemical shifts of absorbing protons are translated into specific shades of grey.
Note: This produces a picture that shows the relative density of specific types of protons; for instance, a dark area on a T1-weighted MRI tends to correspond to water, whereas a light area indicates fattier tissue. Comparison with a normal MRI then allows the diagnostician to detect abnormalities in the scanned region. We mention this to explain the relevance of NMR spectroscopy to medicine; the MCAT will not test you on the details of how MRI works.
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Infrared (IR) spectroscopy measures ____.
Molecular vibrations can be seen as ____.
To record an IR spectrum, i____e is measured.
The infrared light range runs from λ = ____.
The useful absorptions for infrared spectroscopy occur at wavelengths of ____ nm.
On an IR spectrum, we use an analog of ____ called wavenumber.